In this work, a fuzzy logic controller is used to control the output voltage of a
photovoltaic system with a DC-DC converter; type Single Ended Primary
Inductor Converter (SEPIC). The system is designed for 210 W solar
photovoltaic (SCHOTT 210) panel and to feed an average demand of 78 W.
This system includes solar panels, SEPIC converter and fuzzy logic
controller. The SEPIC converter provides a constant DC bus voltage and its
duty cycle controlled by the fuzzy logic controller which is needed to
improve PV panel’s utilization efficiency. A fuzzy logic controller (FLC) is
also used to generate the PWM signal for the SEPIC converter.
MODELING OF HYBRID WIND AND PHOTOVOLTAIC ENERGY SYSTEM USING A NEW CONVERTER ...elelijjournal
Renewable energy technologies offers clean, abundant energy gathered from self-renewing resources such as the sun, wind etc. As the power demand increases, power failure also increases. So, renewable energy sources can be used to provide constant loads. A new converter topology for hybrid wind/photovoltaic energy system is proposed. Hybridizing solar and wind power sources provide a realistic form of power generation.
This paper presents the design and the implementation of a new microcontroller-based solar
Power inverter. The aim of this paper is to design single phase inverter which can convert DC voltage
to AC voltage at high efficiency and low cost. Solar and wind powered electricity generation are
being favored nowadays as the world increasingly focuses on environmental concerns. Power
inverters, which convert solar-cell DC into domestic-use AC, are one of the key technologies for
delivering efficient AC power The hardware and software design are oriented towards a single-chip
microcontroller-based system, hence minimizing the size and cost. With this new approach the
modularization of the conversion from solar power to electric power at its maximum power point can
be made more compact and more reliable.
Interleaved Boost Converter Fed with PV for Induction Motor/Agricultural Appl...IAES-IJPEDS
In present Electricity market Renewable Energy Sources (RES) are gaining much importance. The most common Renewable Energy Sources are Photo voltaic (PV), fuel cell (FC) and wind energy systems, out of these three PV systems PV system can implemented in most of the locations. Due to the power cuts and power disturbances in Distribution systems agriculture application is concentrated on PV based Energy system. The use of PV system is increasing day by day in agriculture application, due to their ease of control and flexibility. PV Electrification schemes also involves various subsidies in government national and international donors. Especially in Agriculture field by use of PV one can achieve higher subsidy. The output of PV system is low voltage DC to have high efficiency. The motors used in agriculture field are Induction Motors (IM) fed from Three phase AC supply, to boost the PV output we need a high voltage gain boost converter along with PWM inverter to Induction motor drive. Out of various DC-DC converter configurations interleaved boost converter is gaining much attention, due to its reduction in size and Electromagnetic Interference (EMI). In this work we are proposing a PV fed interleaved boost converter with PWM inverter for agriculture applications. The design process of interleaved boost converter is explain detail and compared with existing boost converter. A 10 KW Power rating is choosing for the Induction motor drive and design calculations are carried out. A MATLAB/SIMULINK based model is developed for boost and interleaved boost converter and simulation results are presented, finally a scaled down hardware circuit design for interleaved boost converter and results are presented.
Implementation of Solar Powered BLDC Motor Driveijsrd.com
Renewable energy sources are being increasingly implemented in many applications due to the growing concern of environmental pollution. The PV (Photovoltaic) system appears to be most promising one because it is environmentally clean in nature and it directly converts solar energy into electrical energy. This paper presents the FPGA (Field programmable gate array) based speed control of PMBLDC (Permanent magnet Brushless DC) motor & this BLDC motor is driven by the solar energy. The solar panel is used to obtain the energy needed to run BLDC motor. The voltage obtained from solar panel is stored in battery due to the non-constant nature of solar energy. The voltage from battery is not sufficient to run BLDC motor & hence boost converter is used to boost the voltage required to run BLDC motor. Commutation is implemented on FPGA. FPGA based speed control scheme reduces the complexity of motor control hardware & in turn boost the demand for mobile applications.
Implementation of Buck-Boost Converter as Low Voltage Stabilizer at 15 VIJECEIAES
This paper presents the implementation of the buck-boost converter design which is a power electronics applications that can stabilize voltage, even though the input voltage changes. Regulator to stabilize the voltage using PWM pulse that triger pin 2 on XL6009. In this design of buck-boost converter is implemented using the XL6009, LM7815 and TIP2955. LM7815 as output voltage regulator at 15V with 1A output current, while TIP2955 is able to overcome output current up to 5A. When the LM7815 and TIP2955 are connected in parallel, the converter can increase the output current to 6A.. Testing is done using varied voltage sources that can be set. The results obtained from this design can be applied to PV (Photovoltaic) and WP (Wind Power), with changes in input voltage between 3-21V dc can produce output voltage 15V.
Implementation of multi level inverter for SEPIC Converter with Grid-Connecte...ali13jf1a0321
This project represent the photovoltaic cell which is connected to transformer less grid.in this project we are using SEPIC converter against Buck-Boost converter which reduces the losses.
MODELING OF HYBRID WIND AND PHOTOVOLTAIC ENERGY SYSTEM USING A NEW CONVERTER ...elelijjournal
Renewable energy technologies offers clean, abundant energy gathered from self-renewing resources such as the sun, wind etc. As the power demand increases, power failure also increases. So, renewable energy sources can be used to provide constant loads. A new converter topology for hybrid wind/photovoltaic energy system is proposed. Hybridizing solar and wind power sources provide a realistic form of power generation.
This paper presents the design and the implementation of a new microcontroller-based solar
Power inverter. The aim of this paper is to design single phase inverter which can convert DC voltage
to AC voltage at high efficiency and low cost. Solar and wind powered electricity generation are
being favored nowadays as the world increasingly focuses on environmental concerns. Power
inverters, which convert solar-cell DC into domestic-use AC, are one of the key technologies for
delivering efficient AC power The hardware and software design are oriented towards a single-chip
microcontroller-based system, hence minimizing the size and cost. With this new approach the
modularization of the conversion from solar power to electric power at its maximum power point can
be made more compact and more reliable.
Interleaved Boost Converter Fed with PV for Induction Motor/Agricultural Appl...IAES-IJPEDS
In present Electricity market Renewable Energy Sources (RES) are gaining much importance. The most common Renewable Energy Sources are Photo voltaic (PV), fuel cell (FC) and wind energy systems, out of these three PV systems PV system can implemented in most of the locations. Due to the power cuts and power disturbances in Distribution systems agriculture application is concentrated on PV based Energy system. The use of PV system is increasing day by day in agriculture application, due to their ease of control and flexibility. PV Electrification schemes also involves various subsidies in government national and international donors. Especially in Agriculture field by use of PV one can achieve higher subsidy. The output of PV system is low voltage DC to have high efficiency. The motors used in agriculture field are Induction Motors (IM) fed from Three phase AC supply, to boost the PV output we need a high voltage gain boost converter along with PWM inverter to Induction motor drive. Out of various DC-DC converter configurations interleaved boost converter is gaining much attention, due to its reduction in size and Electromagnetic Interference (EMI). In this work we are proposing a PV fed interleaved boost converter with PWM inverter for agriculture applications. The design process of interleaved boost converter is explain detail and compared with existing boost converter. A 10 KW Power rating is choosing for the Induction motor drive and design calculations are carried out. A MATLAB/SIMULINK based model is developed for boost and interleaved boost converter and simulation results are presented, finally a scaled down hardware circuit design for interleaved boost converter and results are presented.
Implementation of Solar Powered BLDC Motor Driveijsrd.com
Renewable energy sources are being increasingly implemented in many applications due to the growing concern of environmental pollution. The PV (Photovoltaic) system appears to be most promising one because it is environmentally clean in nature and it directly converts solar energy into electrical energy. This paper presents the FPGA (Field programmable gate array) based speed control of PMBLDC (Permanent magnet Brushless DC) motor & this BLDC motor is driven by the solar energy. The solar panel is used to obtain the energy needed to run BLDC motor. The voltage obtained from solar panel is stored in battery due to the non-constant nature of solar energy. The voltage from battery is not sufficient to run BLDC motor & hence boost converter is used to boost the voltage required to run BLDC motor. Commutation is implemented on FPGA. FPGA based speed control scheme reduces the complexity of motor control hardware & in turn boost the demand for mobile applications.
Implementation of Buck-Boost Converter as Low Voltage Stabilizer at 15 VIJECEIAES
This paper presents the implementation of the buck-boost converter design which is a power electronics applications that can stabilize voltage, even though the input voltage changes. Regulator to stabilize the voltage using PWM pulse that triger pin 2 on XL6009. In this design of buck-boost converter is implemented using the XL6009, LM7815 and TIP2955. LM7815 as output voltage regulator at 15V with 1A output current, while TIP2955 is able to overcome output current up to 5A. When the LM7815 and TIP2955 are connected in parallel, the converter can increase the output current to 6A.. Testing is done using varied voltage sources that can be set. The results obtained from this design can be applied to PV (Photovoltaic) and WP (Wind Power), with changes in input voltage between 3-21V dc can produce output voltage 15V.
Implementation of multi level inverter for SEPIC Converter with Grid-Connecte...ali13jf1a0321
This project represent the photovoltaic cell which is connected to transformer less grid.in this project we are using SEPIC converter against Buck-Boost converter which reduces the losses.
In this paper a buck-boost dc-dc converter for pv application is proposed, which is mainly composed of a buck – boost converter, PV panel, load and a battery. Existing dc-dc converter can convert the power from the PV panel, but unfortunately the PV panel can only provide power when there is a high intensity of light. In order to provide power supply to the load without any interruption, buck-boost dc-dc converter is introduced. The power intermittency issue of PV panel can be overcome with the aid of a secondary supply which is in this case, the batter. The integration system between the primary and the secondary supply is controlled by a simple proposed control scheme. Battery act as a power in the low voltage side while PV panel is taking over in the high voltage side. Buck-boost converter is operated either is buck or boost mode according to the performance of the PV panel. This paper is presented the simple control scheme to decide the mode suitable for the buck and boost mode. Various conditions are simulated to verify the working operation of the buck-boost converter and to representing solar panel in real life. Simulation and experimental are carried out to verify the system.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
In general, the application of Self-Excited Induction Generator (SEIG) or Synchronous Generator (SG) on the Stand-Alone Micro Hydel Power Plant (MHPP) is equipped with Electronic Load Controller (ELC) to control generator output during variations in consumer load. One type of ELC that is cheap and rigid developed today is the ELC, which is constructed by the uncontrolled bridge rectifier with DC Chopper. Based on the operational concept, basically this type of ELC can be implemented on both SEIG and SG, but both of these generators will have a different harmonic distortion effect on the output and its load. This paper examines the differences in the effects of harmonic distortions due to ELC installation on SEIG and SG. The initial stage of this study was to design the ELC developed. Then, the harmonic distortion response due to the installation of ELC on SEIG and SG is tested, which includes harmonic distortion in: stator current, PCC voltage, and consumer load current. THDI (Current Total Harmonic Distortion) stator current at SEIG with ELC has shown an average value smaller than the THD stator current in SG with ELC. Likewise, the THDV (Voltage Total Harmonic Distortion) value of PCC voltage and THDI value of the current consumer load on SEIG equipped with ELC has been shown to be smaller than the THDV value of PCC voltage and THDI value of the current consumer load on SG equipped with ELC. The effects of harmonic distortions due to the installation of ELCs that developed in this study on SEIG is still within the permitted limits, while on the SG, the harmonic distortion reduction is needed at the generator output.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
Open-Delta VSC Based Voltage Controller in Isolated Power SystemsIJPEDS-IAES
This paper proposes a reduced switch voltage source converter (VSC)
topology implemented as a voltage controller in isolated power systems. In
isolated power systems generally self-excited induction generators (SEIG)
are used mainly for their ruggedness and economic reasons. Mostly for
constant power applications such as pico hydro uncontrolled turbine driven
self excited induction generators feeding three-phase loads are employed.
The proposed reduced switch voltage controller is used to regulate and
control the voltage at the generator terminals as it is subjected to voltage
drops, dips or flickers when the isolated power system is subjected to various
critical loads. In this paper the controller is realized using a three-leg fourswitch
insulated gate bipolar transistor (IGBT) based current controlled
voltage-source converter (CC-VSC) and a self-supporting dc bus containing
two split capacitors, thus reducing the IGBT count and hence cost. This
reduced switch topology forms an Open-Delta type converter. The proposed
generating system along with the controller is modeled and simulated in
MATLAB along with Simulink and power system blockset (PSB) toolboxes.
The system is simulated and the capability of the isolated generating system
along with the reduced switch based voltage controller is presented here
where the generator feeds linear and non-linear loads are investigated.
This paper presents the design and operation of three-stage buck-boost converter with high gain soft switching using closed loop proportional integral (PI) controller. The proposed converter is designed by arranging three identical buck-boost converters working in parallel. The converter units are connected to each other by an inductor as a bridge. This inductor plays a vital role in soft switching operation of converter by maintaining the voltage applied to switches at zero voltage at switching intervals, i.e., the zero-voltage switching (ZVS). The closed-loop system is designed by PI controller, and it maintains the output constant irrespective of changes in input, and the system becomes stable. The proposed converter is efficient in reducing switching losses, leading to improved converter efficiency. Due to parallel operation of three identical converters, the output voltage and input current contain fewer ripples than those of a single converter with same specifications. Proposed converter is more economical and reliable with simpler structure as it utilizes only two inductors as extra elements. The design and analysis of proposed circuit has been carried out in MATLAB Simulink by operating the circuit in various modes.
Single Phase Matrix Converter for Input Power Factor Improvementiosrjce
IOSR Journal of Electrical and Electronics Engineering(IOSR-JEEE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of electrical and electronics engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in electrical and electronics engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Application of single phase matrix converter topology to an uninterruptible p...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IEEE 2015-15 Power Electronics and Power System Project titles for ME and BE Students,Bangalore.power electronics and power system projects in bangalore.
Multilevel Voltage Source Inverter for Grid Connected Photovoltaic System imtiyazsayyed
Solar electric energy demand has grown consistently by 20% to 25% per annum over the past 20 years, which is mainly due to the decreasing costs and prices. In recent years, multilevel inverters have become more attractive for researchers and manufacturers due to their advantages over conventional three level PWM inverters. They offer improved output waveforms, smaller filter size and lower EMI, lower Total Harmonic Distortion.
REFERENCE
[1] Puneet Kumar Chaudhay, “A Critical Review on Photovoltaic Base Maximum Power Generation System” , International Journal of Recent Technology and Engineering (IJRTE) , Volume-1, Issue-6, January 2013
[2] Mr. R.Anand and Mr. G.Ashok Kumar, “Multilevel Inverter for Grid Connected Photovoltaic System by employing PID Controller”, International Journal of Engineering and Advanced Technology (IJEAT) , Volume-2, Issue-1, October 2012.
[3] Mr. Amol Karpe and MrBindu R, “A Comparison of Conventional and Multilevel Inverter for 2.3 kV Induction Motor Drives”, International Journal of Advances in Electrical and Electronics Engineering,
[4] E. Beser, B. Arifoglu, S. Camur, E. K Beser, “A grid-connected photovoltaic power conversion system with single-phase multilevel inverter”. Solar Energy, vol. 84, No 12, pp. 2056-2067, 2010.
[5] Vikas Kulkarni, Rajesh Nehete, “Simulation and Analysis of Photo-Voltaic (PV) based Solar Inverter System”, International Journal of Soft Computing and Engineering (IJSCE) , Volume-3, Issue-6, January 2014.
[6] Muhammad H. Rashid “Power Electronics: Circuits, Devices and Applications”, 3rd Edition, Pearson publication, pp.406-429.
MPPT oscillations minimization in PV system by controlling non-linear dynamic...IJECEIAES
Solar PV power generation has achieved rapid growth in developing countries which has many merits such as absence of noise, longer life, no pollution, less time for installation, and ease of grid interface. A maximum power point tracking circuit (MPPT) consists of DC-DC power electronics converters that are used to improve the energy attainment from solar PV array. This paper presents a detailed analysis to control of chaos, a non-linear dynamic in SEPIC DC-DC converter interfaced solar PV system, to minimize the oscillations near to MPP. In SEPIC DC-DC converter, the input inductor current is continuous and capable of sweeping the whole I-V curve of a PV module from open circuit voltage (V oc ) to short circuit current (I sc ) operating points. To trace the true maximum power point and to nullify the oscillations near to MPP, the yield output voltage needs to ensure period-1 operation.
Power Factor Correction in Two Leg Inverter Fed BLDC Drive Using Cuk Dc-Dc Co...IJPEDS-IAES
Earlier for variable speed application conventional motors were used, but
these motors have poor characteristics. These drawbacks were overcome by
brushless Dc motor drive. Now days in most of the applications such as
industrial, domestic, aerospace, defense, medical and traction etc, brushless
DC motor (BLDCM) is popular for its high efficiency, high torque to weight
ratio, small size, and high reliability, ease of control and low maintenance
etc. BLDC motor is a electronic commutator driven drive i.e. it uses a threephase
voltage source inverter for its operation, electronic devices means there
is a problem of poor power quality, more torque ripple and speed
fluctuations. This paper deals with the CUK converter two leg inverter fed
BLDCM drive in closed loop operation. The proposed control strategy on
CUK converter two leg inverter fed BLDCM drive with split DC source is
modeled and implemented using MATLAB/Simulink. The proposed method
improves the efficiency of the drive system with Power factor correction
feature in wide range of the speed control, less torque ripple and smooth
speed control.
SIMULATION AND ASSESSMENT OF SINGLE PHASE SEMI-Z-SOURCE INVERTER (S-ZSI)IAEME Publication
The present investigation is a step towards the development of a single phase semi-Z-source inverter (s-ZSI) with photovoltaic, its topology and the assessment with respect to the voltage and current output. The proposed semi-Z-source inverter use only two active switches to achieve a desired output. The simulation was carried out using MATLAB and the results are discussed in various waveforms.
The power generation using solar photovoltaic (PV) system in microgrid requires energy storage system due to their dilute and intermittent nature. The system requires efficient control techniques to ensure the reliable operation of the microgrid. This work presents dynamic power management using a decentralized approach. The control techniques in microgrid including droop controllers in cascade with proportional-integral (PI) controllers for voltage stability and power balance have few limitations. PI controllers alone will not ensure microgrid’s stability. Their parameters cannot be optimized for varying demand and have a slow transient response which increases the settling time. The droop controllers have lower efficiency. The load power variation and steady-state voltage error make the droop control ineffective. This paper presents a control scheme for dynamic power management by incorporating the combined PI and hysteresis controller (CPIHC) technique. The system becomes robust, performs well under varying demand conditions, and shows a faster dynamic response. The proposed DC microgrid has solar PV as an energy source, a lead-acid battery as the energy storage system, constant and dynamic loads. The simulation results show the proposed CPIHC technique efficiently manages the dynamic power, regulates DC link voltage and battery’s state of charge (SoC) compared to conventional combined PI and droop controller (CPIDC).
A Study of SEPIC Converter Based Fuzzy Logic Controller For Hybrid SystemIJRST Journal
This paper presents the study of integrated hybrid renewable energy system. The wind and solar are used as input sources for the hybrid system. The proposed system involves the design of photovoltaic (PV) and wind energy conversion system (WECS).The system is designed for constant wind speed and varying solar irradiation and insolation. Maximum power point tracking (MPPT) algorithm is used to extract the maximum power from PV array. The integration of two input sources is done by single-ended primary-inductor converter. Fuzzy logic controller is used to control the duty cycle of one of the converter switch thereby extracting the maximum power from solar array. The system consists of photovoltaic (PV) array, wind energy conversion system (WECS), single-ended primary-inductor converter, voltage source inverter (VSI), LC filter and three phase load.
Incremental Conductance MPPT Algorithm for PV System Implemented Using DC-DC ...IJERA Editor
The two basic topologies of switch mode DC-DC converters (Buck and Boost) are analyzed with a view of their use in PV (photovoltaic) systems, as the photovoltaic generator exhibits non-linear characteristics due to the change in environmental condition and load variation. As the efficiency of PV panels is low it becomes mandatory to extract maximum power from the PV panel at a given period of time. Several MPPT algorithms with different types of converters are being proposed for extracting maximum power from the PV panel. It is found that the nature of load plays an important role in the choice of topology. This paper investigates the implementation issues of Incremental Conductance method with Buck and Boost Converters. Mathematical analysis and desirable steady-state operating point of the converters are derived to give satisfactory maximum power point tracking operation.
Hardware Implementation of Solar Based Boost to SEPIC Converter Fed Nine Leve...IJPEDS-IAES
Multi level inverters are widely used in high power applications because of
low harmonic distortion. This paper deals with the simulation
and implementation of PV based boost to SEPIC converter with multilevel
inverter. The output of PV system is stepped up using boost to sepic
converter and it is converted into AC using a multilevel inverter.
The simulation and experimental results with the R load is presented in this
paper. The FFT analysis is done and the THD values are compared. Boost to
SEPIC converter is proposed to step up the voltage to the required value. The
experimental results are compared with the simulation results. The results
indicate that nine level inverter system has better performance than seven
level inverter system.
In this paper a buck-boost dc-dc converter for pv application is proposed, which is mainly composed of a buck – boost converter, PV panel, load and a battery. Existing dc-dc converter can convert the power from the PV panel, but unfortunately the PV panel can only provide power when there is a high intensity of light. In order to provide power supply to the load without any interruption, buck-boost dc-dc converter is introduced. The power intermittency issue of PV panel can be overcome with the aid of a secondary supply which is in this case, the batter. The integration system between the primary and the secondary supply is controlled by a simple proposed control scheme. Battery act as a power in the low voltage side while PV panel is taking over in the high voltage side. Buck-boost converter is operated either is buck or boost mode according to the performance of the PV panel. This paper is presented the simple control scheme to decide the mode suitable for the buck and boost mode. Various conditions are simulated to verify the working operation of the buck-boost converter and to representing solar panel in real life. Simulation and experimental are carried out to verify the system.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
In general, the application of Self-Excited Induction Generator (SEIG) or Synchronous Generator (SG) on the Stand-Alone Micro Hydel Power Plant (MHPP) is equipped with Electronic Load Controller (ELC) to control generator output during variations in consumer load. One type of ELC that is cheap and rigid developed today is the ELC, which is constructed by the uncontrolled bridge rectifier with DC Chopper. Based on the operational concept, basically this type of ELC can be implemented on both SEIG and SG, but both of these generators will have a different harmonic distortion effect on the output and its load. This paper examines the differences in the effects of harmonic distortions due to ELC installation on SEIG and SG. The initial stage of this study was to design the ELC developed. Then, the harmonic distortion response due to the installation of ELC on SEIG and SG is tested, which includes harmonic distortion in: stator current, PCC voltage, and consumer load current. THDI (Current Total Harmonic Distortion) stator current at SEIG with ELC has shown an average value smaller than the THD stator current in SG with ELC. Likewise, the THDV (Voltage Total Harmonic Distortion) value of PCC voltage and THDI value of the current consumer load on SEIG equipped with ELC has been shown to be smaller than the THDV value of PCC voltage and THDI value of the current consumer load on SG equipped with ELC. The effects of harmonic distortions due to the installation of ELCs that developed in this study on SEIG is still within the permitted limits, while on the SG, the harmonic distortion reduction is needed at the generator output.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
Open-Delta VSC Based Voltage Controller in Isolated Power SystemsIJPEDS-IAES
This paper proposes a reduced switch voltage source converter (VSC)
topology implemented as a voltage controller in isolated power systems. In
isolated power systems generally self-excited induction generators (SEIG)
are used mainly for their ruggedness and economic reasons. Mostly for
constant power applications such as pico hydro uncontrolled turbine driven
self excited induction generators feeding three-phase loads are employed.
The proposed reduced switch voltage controller is used to regulate and
control the voltage at the generator terminals as it is subjected to voltage
drops, dips or flickers when the isolated power system is subjected to various
critical loads. In this paper the controller is realized using a three-leg fourswitch
insulated gate bipolar transistor (IGBT) based current controlled
voltage-source converter (CC-VSC) and a self-supporting dc bus containing
two split capacitors, thus reducing the IGBT count and hence cost. This
reduced switch topology forms an Open-Delta type converter. The proposed
generating system along with the controller is modeled and simulated in
MATLAB along with Simulink and power system blockset (PSB) toolboxes.
The system is simulated and the capability of the isolated generating system
along with the reduced switch based voltage controller is presented here
where the generator feeds linear and non-linear loads are investigated.
This paper presents the design and operation of three-stage buck-boost converter with high gain soft switching using closed loop proportional integral (PI) controller. The proposed converter is designed by arranging three identical buck-boost converters working in parallel. The converter units are connected to each other by an inductor as a bridge. This inductor plays a vital role in soft switching operation of converter by maintaining the voltage applied to switches at zero voltage at switching intervals, i.e., the zero-voltage switching (ZVS). The closed-loop system is designed by PI controller, and it maintains the output constant irrespective of changes in input, and the system becomes stable. The proposed converter is efficient in reducing switching losses, leading to improved converter efficiency. Due to parallel operation of three identical converters, the output voltage and input current contain fewer ripples than those of a single converter with same specifications. Proposed converter is more economical and reliable with simpler structure as it utilizes only two inductors as extra elements. The design and analysis of proposed circuit has been carried out in MATLAB Simulink by operating the circuit in various modes.
Single Phase Matrix Converter for Input Power Factor Improvementiosrjce
IOSR Journal of Electrical and Electronics Engineering(IOSR-JEEE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of electrical and electronics engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in electrical and electronics engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Application of single phase matrix converter topology to an uninterruptible p...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IEEE 2015-15 Power Electronics and Power System Project titles for ME and BE Students,Bangalore.power electronics and power system projects in bangalore.
Multilevel Voltage Source Inverter for Grid Connected Photovoltaic System imtiyazsayyed
Solar electric energy demand has grown consistently by 20% to 25% per annum over the past 20 years, which is mainly due to the decreasing costs and prices. In recent years, multilevel inverters have become more attractive for researchers and manufacturers due to their advantages over conventional three level PWM inverters. They offer improved output waveforms, smaller filter size and lower EMI, lower Total Harmonic Distortion.
REFERENCE
[1] Puneet Kumar Chaudhay, “A Critical Review on Photovoltaic Base Maximum Power Generation System” , International Journal of Recent Technology and Engineering (IJRTE) , Volume-1, Issue-6, January 2013
[2] Mr. R.Anand and Mr. G.Ashok Kumar, “Multilevel Inverter for Grid Connected Photovoltaic System by employing PID Controller”, International Journal of Engineering and Advanced Technology (IJEAT) , Volume-2, Issue-1, October 2012.
[3] Mr. Amol Karpe and MrBindu R, “A Comparison of Conventional and Multilevel Inverter for 2.3 kV Induction Motor Drives”, International Journal of Advances in Electrical and Electronics Engineering,
[4] E. Beser, B. Arifoglu, S. Camur, E. K Beser, “A grid-connected photovoltaic power conversion system with single-phase multilevel inverter”. Solar Energy, vol. 84, No 12, pp. 2056-2067, 2010.
[5] Vikas Kulkarni, Rajesh Nehete, “Simulation and Analysis of Photo-Voltaic (PV) based Solar Inverter System”, International Journal of Soft Computing and Engineering (IJSCE) , Volume-3, Issue-6, January 2014.
[6] Muhammad H. Rashid “Power Electronics: Circuits, Devices and Applications”, 3rd Edition, Pearson publication, pp.406-429.
MPPT oscillations minimization in PV system by controlling non-linear dynamic...IJECEIAES
Solar PV power generation has achieved rapid growth in developing countries which has many merits such as absence of noise, longer life, no pollution, less time for installation, and ease of grid interface. A maximum power point tracking circuit (MPPT) consists of DC-DC power electronics converters that are used to improve the energy attainment from solar PV array. This paper presents a detailed analysis to control of chaos, a non-linear dynamic in SEPIC DC-DC converter interfaced solar PV system, to minimize the oscillations near to MPP. In SEPIC DC-DC converter, the input inductor current is continuous and capable of sweeping the whole I-V curve of a PV module from open circuit voltage (V oc ) to short circuit current (I sc ) operating points. To trace the true maximum power point and to nullify the oscillations near to MPP, the yield output voltage needs to ensure period-1 operation.
Power Factor Correction in Two Leg Inverter Fed BLDC Drive Using Cuk Dc-Dc Co...IJPEDS-IAES
Earlier for variable speed application conventional motors were used, but
these motors have poor characteristics. These drawbacks were overcome by
brushless Dc motor drive. Now days in most of the applications such as
industrial, domestic, aerospace, defense, medical and traction etc, brushless
DC motor (BLDCM) is popular for its high efficiency, high torque to weight
ratio, small size, and high reliability, ease of control and low maintenance
etc. BLDC motor is a electronic commutator driven drive i.e. it uses a threephase
voltage source inverter for its operation, electronic devices means there
is a problem of poor power quality, more torque ripple and speed
fluctuations. This paper deals with the CUK converter two leg inverter fed
BLDCM drive in closed loop operation. The proposed control strategy on
CUK converter two leg inverter fed BLDCM drive with split DC source is
modeled and implemented using MATLAB/Simulink. The proposed method
improves the efficiency of the drive system with Power factor correction
feature in wide range of the speed control, less torque ripple and smooth
speed control.
SIMULATION AND ASSESSMENT OF SINGLE PHASE SEMI-Z-SOURCE INVERTER (S-ZSI)IAEME Publication
The present investigation is a step towards the development of a single phase semi-Z-source inverter (s-ZSI) with photovoltaic, its topology and the assessment with respect to the voltage and current output. The proposed semi-Z-source inverter use only two active switches to achieve a desired output. The simulation was carried out using MATLAB and the results are discussed in various waveforms.
The power generation using solar photovoltaic (PV) system in microgrid requires energy storage system due to their dilute and intermittent nature. The system requires efficient control techniques to ensure the reliable operation of the microgrid. This work presents dynamic power management using a decentralized approach. The control techniques in microgrid including droop controllers in cascade with proportional-integral (PI) controllers for voltage stability and power balance have few limitations. PI controllers alone will not ensure microgrid’s stability. Their parameters cannot be optimized for varying demand and have a slow transient response which increases the settling time. The droop controllers have lower efficiency. The load power variation and steady-state voltage error make the droop control ineffective. This paper presents a control scheme for dynamic power management by incorporating the combined PI and hysteresis controller (CPIHC) technique. The system becomes robust, performs well under varying demand conditions, and shows a faster dynamic response. The proposed DC microgrid has solar PV as an energy source, a lead-acid battery as the energy storage system, constant and dynamic loads. The simulation results show the proposed CPIHC technique efficiently manages the dynamic power, regulates DC link voltage and battery’s state of charge (SoC) compared to conventional combined PI and droop controller (CPIDC).
A Study of SEPIC Converter Based Fuzzy Logic Controller For Hybrid SystemIJRST Journal
This paper presents the study of integrated hybrid renewable energy system. The wind and solar are used as input sources for the hybrid system. The proposed system involves the design of photovoltaic (PV) and wind energy conversion system (WECS).The system is designed for constant wind speed and varying solar irradiation and insolation. Maximum power point tracking (MPPT) algorithm is used to extract the maximum power from PV array. The integration of two input sources is done by single-ended primary-inductor converter. Fuzzy logic controller is used to control the duty cycle of one of the converter switch thereby extracting the maximum power from solar array. The system consists of photovoltaic (PV) array, wind energy conversion system (WECS), single-ended primary-inductor converter, voltage source inverter (VSI), LC filter and three phase load.
Incremental Conductance MPPT Algorithm for PV System Implemented Using DC-DC ...IJERA Editor
The two basic topologies of switch mode DC-DC converters (Buck and Boost) are analyzed with a view of their use in PV (photovoltaic) systems, as the photovoltaic generator exhibits non-linear characteristics due to the change in environmental condition and load variation. As the efficiency of PV panels is low it becomes mandatory to extract maximum power from the PV panel at a given period of time. Several MPPT algorithms with different types of converters are being proposed for extracting maximum power from the PV panel. It is found that the nature of load plays an important role in the choice of topology. This paper investigates the implementation issues of Incremental Conductance method with Buck and Boost Converters. Mathematical analysis and desirable steady-state operating point of the converters are derived to give satisfactory maximum power point tracking operation.
Hardware Implementation of Solar Based Boost to SEPIC Converter Fed Nine Leve...IJPEDS-IAES
Multi level inverters are widely used in high power applications because of
low harmonic distortion. This paper deals with the simulation
and implementation of PV based boost to SEPIC converter with multilevel
inverter. The output of PV system is stepped up using boost to sepic
converter and it is converted into AC using a multilevel inverter.
The simulation and experimental results with the R load is presented in this
paper. The FFT analysis is done and the THD values are compared. Boost to
SEPIC converter is proposed to step up the voltage to the required value. The
experimental results are compared with the simulation results. The results
indicate that nine level inverter system has better performance than seven
level inverter system.
Performance numerical evaluation of modified single-ended primary-inductor c...IJECEIAES
Single-ended primary-inductor converter (SEPIC) was considered a good alternative to a DC-DC converter for photovoltaic (PV) systems. The SEPIC converter can operate with an input voltage greater or less than the regulated output voltage, or as a step-up or step-down. As a step-up converter, SEPIC boosts PV voltage to specific levels. However, gain limitation and voltage stress continue to reduce the efficiency of conventional SEPIC converters. Because of this, researchers created a modified SEPIC converter to improve performance. In this paper, six modified SEPIC converters were compared and evaluated. To compare fairly, all modified SEPIC converters are nonisolated and use a single switch. Power simulator (PSIM) software was used to simulate each converter with a BISOL BMO-250 PV module and maximum power point tracking (MPPT) P&O controller. The converter with the highest static voltage gain and lowest duty cycle has been identified. It results in up to ten times voltage increment with a 0.8-duty ratio. All topologies have the same voltage stress, with maximum and minimum values of 30.1 and 29.5 V, respectively. On the other hand, each topology produces different average efficiencies, with the highest and lowest efficiency at 99.5% and 97.2%, respectively.
Filter Based Solar Power Generation System with a Seven Level InverterIJMTST Journal
This paper proposes a new solar power generation system, which is composed of a DC/DC power converter and a new seven-level inverter. The DC/DC power converter integrates a DC-DC boost converter and a transformer to convert the output voltage of the solar cell array into two independent voltage sources with multiple relationships. This new seven-level inverter is configured using a capacitor selection circuit and a full-bridge power converter, connected in cascade. The capacitor selection circuit converts the two output voltage sources of DC-DC power converter into a three-level DC voltage and the full- bridge power converter further converts this three- level DC voltage into a seven-level AC voltage. In this way, the proposed solar power generation system generates a sinusoidal output current that is in phase with the utility voltage and is fed into the utility. The salient features of the proposed seven-level inverter are that only six power electronic switches are used and only one power electronic switch is switched at high frequency at any time. A prototype is developed and tested to verify the performance of this proposed solar power generation system.
The performance of PV panel is very much dependent on the amount of sun light as well as the temperature of the surrounding environment which normally hard to be predicted. The use of PV emulator in the investigation of solar inverter especially at a lab scale platform helps to mitigate the inconsistency factors due to this uncontrollable variation. This work discussed on the design and development of a PV emulator for the grid-connected quasi-Z-source inverter which has different topology and control method compared to the conventional voltage source inverter. The I-V characteristics of the PV panel is modelled from the commercially available product and through circuit analysis the relation between capacitor voltage control and the PV terminal voltage is established, thus realizing the MPPT operation. Results from both simulation and experimental verification demonstrated that the PV emulator successfully able to produce power for the inverter according to the requirement.
Design and Simulation of Efficient DC-DC Converter Topology for a Solar PV Mo...Sajin Ismail
Modulated Integrated Converter systems are considered to be the new and global turning point in the field of
Solar PV systems. These converters are highly recognised for its modular size and compact nature and they are supposed to
be attached directly with each PV module and since one PV module is having the power rating of a few watts ranging from
0-500Ws, the design rating would be in the same range and thus the most vital condition in such a design is efficiency
under these relatively low loads. In this paper an isolated interleaved boost converter topology is considered in the DC-DC
section and which is designed and simulated for a specific power rating (250W) and the efficiency is analysed with varying
load conditions and compared with the target efficiency of the system.
Simulation of various DC-DC converters for photovoltaic systemIJECEIAES
This work explains the comparison of various dc-dc converters for photovoltaic systems. In recent day insufficient energy and continues increasing in fuel cost, exploration on renewable energy system becomes more essential. For high and medium power applications, high input source from renewable systems like photovoltaic and wind energy system turn into difficult one, which leads to increase of cost for installation process. So the generated voltage from PV system is boosted with help various boost converter depends on the applications. Here the various converters are like boost converter, buck converter, buck-boost converter, cuk converter, sepic converter and zeta converter are analysed for photovoltaic system, which are verified using matlab / simulink.
New Structure for Photovoltaic SystemApplications with Maximum Power Point Tr...IAES-IJPEDS
This paper recommendes a new structure for photovoltaicsystems with a new inverter topology. A quasi-Z-source DC-DC converter with capability of dividing its output voltage to the same voltages and tracking maximum power point is proposed. The proportional-integral incremental conductance method is used for maximum power point tracking. The new recommended inverter topology is linked to quasi-Z-source converter for transferring power. For triggering inverter switches, alternate phase opposition disposition switching technique is utilized. A comparison is drawn between suggested multilevel inverter topology and other conventional multilevel inverter topologies. Description of proposed structure along with detailed simulation results that verify its feasibility are given to demonstrate the availability of the proposed system by MATLAB/Simulink software.
Real Time Implementation of Variable Step Size Based P&O MPPT for PV Systems ...IJPEDS-IAES
Nowadays Solar energy is an important energy source due to the energy crisis and environment pollution. Maximum power point tracking (MPPT) algorithm improves the utilization efficiency of a photovoltaic systems. In this paper an improved P&O MPPT algorithm is developed and simulated using MATLAB / SIMULINK to control the DC/DC buck converter. The obtained simulink model is also verified using dspace tool. Both the simulated and experimental results are validated by also comparing them with conventional MPPT methods. The performance measures show the increase in the efficiency of PV system by the proposed model.
Implementation of TI-SEPIC Converter for Optimal Utilization Of PV Powerijtsrd
In this project qualitative analysis and controller design of a TI-SEPIC converter for optimal utilization photovoltaic power is presented. This converter is essentially combination of conventional buck and SEPIC converters sharing common components. On the account of the integration load side only one inductor is sufficient enough for performing the power conversion in both Buck and SEPIC converters. Here the function of the lower SEPIC converter is to extract maximum power from the PV and feeds into the load, while the remaining load power demand is supplied by the dc source through a voltage-mode controlled buck converter. Proposed integrated Converter performance is verified through MAT/SIM software simulations and then verified with measurement results obtained the laboratory prototype converter system. A.S.Valarmathy"Implementation of TI-SEPIC Converter for Optimal Utilization Of PV Power" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-5 , August 2017, URL: http://www.ijtsrd.com/papers/ijtsrd2393.pdf http://www.ijtsrd.com/engineering/electrical-engineering/2393/implementation-of-ti-sepic-converter-for-optimal-utilization-of-pv-power/asvalarmathy
Design and Development of Power Electronic Controller for Grid-connected PV A...IJAPEJOURNAL
Design and simulation of a simple power electronic interface for grid-connected PV array has been proposed using boost converter and line-commutated inverter with maximum power point tracking (MPPT) controller. The output of PV array varies with irradiation, and hence the duty cycle of the PI controller is adjusted automatically to supply a constant DC voltage to the inverter circuit, the output of which is directly connected to the grid. The MPPT controller extracts maximum power from the solar array and feeds it to the single-phase utility grid. The proposed scheme has been modeled in the MATLAB 7.1 software and the complete system has been simulated for open loop and closed loop configurations. The active power fed to the grid is taken for different firing angles in open loop mode and the firing angle for maximum power has been determined. This is compared with the firing angle obtained from the closed loop mode and found that both results agree with each other.
A Integrated Technique of SIDO PFC Fly back Converter in power systemIJMTST Journal
Energy saving is the major international efforts to control down the global warming .Power electronics based devices has being improving day by day for saving the electrical energy in the power grids. The govt. of India is also contributing several projects based on energy conservation. The Designing of a single-inductor dual output (SIDO) fly-back power factor correction (PFC) converter is proposed, in which the PFC and power conversion are done at the same time, multiplexing of a single-inductor is implemented through which each output can be regulated independently. The converter will be operating under in critical conduction mode (CRM). A SIDO PFC converter is a system of dual efficient DC output obtained from the AC source, it can also be replaced by solar panel and our system is capable of running a dc motor also, fly back converter can be used in both ac-dc and dc-dc conversion process. The efficiency along with power factor, total harmonic distortion (THD), settling time and output accuracy of this converter will be improved by implementing the neural network as controllers in the system
Z - Source Multi Level Inverter Based PV Generation SystemIJERA Editor
In this paper a novel technique of Z-Source multilevel Inverter based PV Generation system is implemented and simulated using MATLAB-Simulink simulation software. The Photovoltaic cells are healthier option for converting solar energy into electricity. Due to high capital cost and low efficiency PV cells have not yet been a fully smart choice for electricity users. To enhance the performance of the system, Z-Source multi level inverter can be used in place of conventional Voltage Source Inverter (VSI) in Solar Power Generation System. The PV cell model is developed using circuit mathematical equations. The Z-Source multilevel inverter is modeled to realize boosted DC to AC conversion (inversion) with low THD. Outcome shows that the energy conversion efficiency of ZSMLI is a lot improved as compared to conventional voltage Source Inverter (VSI). By doing FFT analysis we can know the total THD.
42 30 nA Comparative Study of Power Semiconductor Devices for Industrial PWM ...IAES-IJPEDS
The growing demand of energy translates into efficiency requirements of
energy conversion systems and electric drives. Both these systems are based
on Pulse Width Modulation (PWM) Inverter. In this paper we firstly present
the state of art of the main types of semiconductors devices for Industrial
PWM Inverter. In particular we examine the last generations of Silicon
Carbide (SiC) MOSFETs and Insulated Gate Bipolar Transistors (IGBTs)
and we present a comparison between these devices, obtained by SPICE
simulations, both for static characteristics at different temperatures and for
dynamic ones at different gate resistance, in order to identify the one which
makes the PWM inverter more efficient.
Modeling and State Feedback Controller Design of Tubular Linear Permanent Mag...IAES-IJPEDS
In this paper a state feedback controller for tubular linear permanent magnet
synchronous motor (TLPMSM) containing two gas springs, is presented.
The proposed TLPMSM controller is used to control reciprocating motions
of TLPMSM. The analytical plant model of TLPMSM is a multi-input
multi-output (MIMO) system which is decoupled to some sub single-input
single-output (SISO) systems, then, the sub SISO systems are converted to
sub-state space models. Indeed, the TLPMSM state space model is decoupled
to some sub-state spaces, and then, the gains of state feedback are calculated
by linear quadratic regulation (LQR) method for each sub-state space
separately. The controller decreases the distortions of the waveforms.
The simulation results indicate the validity of the controller.
Analysis of Harmonics and Ripple Current in Multi-Module Converters with Incr...IAES-IJPEDS
Controlled rectifiers are considered as the most important hardware part in
the field of HVDC systems in transmission lines and can be used for a
number of power electronics based system operation, control and utility
applications. In this paper, a brief design of a 12-pulse, 24-pulse, 36-pulse
and a 48-pulse converter connected to the grid is presented along with the
harmonic and ripple current analysis with its comparison statistics and thus
providing a justification for the suitable ones. The performance of the
12, 24, 36 and 48-pulse converters are compared for their effectiveness in
both quantitatively as well as qualitatively. Further, comparison of the
48-pulse converter on its THD and current ripple which is connected towards
the grid with simple pulse width modulation technique is also proposed. It
combines all features of the low switching concepts and DC current reinjection
techniques. Some basic topological explanation of the controlled
rectifiers and simulation results using MATLAB are also presented in this
paper in order to justify the harmonic analysis. The simulation results along
with the quantitative results shows the effectiveness of the proposed scheme
for the cancelation or the elimination of the harmonics result in maximum
harmonic mitigation, for high power utility applications, the 48-pulse
converter is most fitting to improve the conversion efficiency, low di/dt
and dv/dt and active and reactive power controllability.
Comparative Study of Various Adjustable Speed Drives during Voltage SagIAES-IJPEDS
This Paper compares the sensitivity of various adjustable speed drives to
voltage sag for the process control applications. Three phase voltage sag of
type B caused due to SLG fault is considered and four topologies of ASD’s
are compared in this paper. The comparison is done especially in speed,
voltage, current and torque of the ASDs. Diode rectifier without z source
inverter, diode rectifier with z source inverter, single phase two leg Vienna
rectifier and single phase neutral linked Vienna with z source inverter are
compared and the best one is highlighted. The circuits of various ASD’s are
simulated using Matlab /Simulink.
Modified Distribution Transformer for Enhancing Power Quality in Distribution...IAES-IJPEDS
The percentage of non-linear loads in the power distribution sector is increasing
day by day. Harmonics injected by these non-linear loads circulate in the delta
windings of the conventional distribution transformer thereby increasing the
temperature and losses. This reduces the efficiency and life of the transformers.
In a modified distribution transformer configuration proposed recently, called
star-star-delta_utilized configuration (YYD_utilized), the harmonics circulating
in the delta winding was utilized and the drainage power thus recovered was
used to power auxiliary loads. This paper presents the experimental studies
conducted on YYD_utilized distribution transformer. When compared to
conventional star-star, delta-star and star-star-delta transformers, the new
configuration of YYD_utilized transformer has shown considerable
improvement in transformer efficiency. The results obtained show that when
the power from the circulating harmonics is recovered and utilized, it not only
improves transformer efficiency but also improves the power factor
and reduces the harmonic distortions at the primary side of the transformer.
The results obtained also suggest the existence of maximum power point or an
optimum loading for the recovered harmonic power.
Modelling of Virtual Synchronous Converter for Grid-Inverter Synchronization ...IAES-IJPEDS
In this paper, virtual synchronous converter (VSCon) is been developed
which mimic the behavior of synchronous generator as in order to have fast
synchronization between the inverter with the grid. This synchronization is
important before can sent the power among inverter-grid connection. This
technique can also been applied at the distributed generated sources when are
connected to the local microgrids. Here, the frequency and voltage
synchronization also can be controlled at the same time some improvement
on synchronous generator mathematical model that is suitable to be
implemented into the inverter control. The whole unit of VSCon is operated
and simulated in Matlab/Simulink in order to observe all consequences
during synchronizing the voltage, frequency and phase-angle. It has been
verified by the simulation circuit where, the power converter can be
synchronized with the microrids without using a PLL unit for self
synchronization. This VSCon technique has proven that, by applying the
concept of the synchronous generator model in inverter control, it can cause
the inverter to behave as generator system, which does not required any
phase information from the grid in order to be synchronized.
Enhanced Crowbar Protection for Fault Ride through Capability of Wind Generat...IAES-IJPEDS
Due to increasing demand in power, the integration of renewable sources like
wind generation into power system is gaining much importance nowadays.
The heavy penetration of wind power into the power system leads to many
integration issues mainly due to the intermittent nature of the wind and the
desirability for variable speed operation of the generators. As the wind power
generation depends on the wind speed, its integration into the grid has
noticeable influence on the system stability and becomes an important issue
especially when a fault occurs on the grid. The protective disconnection of a
large amount of wind power during a fault will be an unacceptable
consequence and threatens the power system stability. With the increasing
use of wind turbines employing Doubly Fed Induction Generator (DFIG)
technology, it becomes a necessity to investigate their behavior during grid
faults and support them with fault ride through capability. This paper
presents the modeling and simulation of a doubly fed induction generator
according to grid code compatibility driven by a wind turbine connected to
the grid. This paper analyses the voltage sag due to a three-phase fault in the
wind connected grid. A control strategy including a crowbar circuit has been
developed in MATLAB/SIMULINK to bypass the rotor over currents during
grid fault to enhance the fault ride through capability and to maintain system
stability. Simulation results show the effectiveness of the proposed control
strategies in DFIG based grid connected wind turbine system.
An Improved of Multiple Harmonic Sources Identification in Distribution Syste...IAES-IJPEDS
This paper introduces an improved of multiple harmonic sources
identification that been produced by inverter loads in power system using
time-frequency distribution (TFD) analysis which is spectrogram.
The spectrogram is a very applicable method to represent signals in
time-frequency representation (TFR) and the main advantages
of spectrogram are the accuracy, speed of the algorithm and use low memory
size such that it can be computed rapidly. The identification of multiple
harmonic sources is based on the significant relationship of spectral
impedances which are the fundamental impedance (Z1) and harmonic
impedance (Zh) that extracted from TFR. To verify the accuracy of the
proposed method, MATLAB simulations carried out several unique cases
with different harmonic producing loads on IEEE 4-bus test feeder cases. It is
proven that the proposed method is superior with 100% correct identification
of multiple harmonic sources. It is envisioned that the method is very
accurate, fast and cost efficient to localize harmonic sources in distribution
system.
Performance and Energy Saving Analysis of Grid Connected Photovoltaic in West...IAES-IJPEDS
The paper presents performance and energy saving analysis of 1.25 kWp grid
connected photovoltaic system under difference weather condition in West
Sumatera. The measured data were performed during weather data that often
occur in West Sumatra i.e. sunny, overcast, raining and cloudy.
The synchronizing process successfully done even bad weather conditions
when sunlight was low automatically. Photovoltaic in average start
producing power from 7:00 AM to 6:00 PM for normal or clear sky, however
under overcast, raining and cloudy weather, the PV power decreased and
disconnected earlier before sunset. During intermittent raining, overcast and
cloud covered the PV power output show an irregular profile. The PV energy
saving performed for three residential connection cases: 1300 VA, 900 VA
with subsidized and 900 VA without subsidized. The solar PV installation
have more benefits and energy saving for 1300 VA, 900 VA without
subsidized with payback period around 8.5 years. However, the 900 VA with
subsidized take longer 20.8 years, but still in PV lifespan 25 years. In the
future, household subsidies may be reduced or eliminated, the solar energy
will be viable alternative of energy resources when it can produce electricity
at a cost equivalent to utility grid PLN rate.
An Improved Constant Voltage Based MPPT Technique for PMDC MotorIAES-IJPEDS
Stand-alone photovoltaic (SAPV) systems are being used in remote areas
and are being seen as one of the promising solution in this regard. The SAPV
system as presented in the paper consists of solar PV panel, a DC-DC
converter, a controller and a PMDC motor. The current-voltage and powervoltage
characteristics being nonlinear, the SAPV system require maximum
power point techniques (MPPT) control techniques to extract maximum
power available from the PV cell. A voltage based MPPT technique which is
capable of tracking MPP has been selected because of numerous advantages
it offers such as: simple and low cost of implementation. The limitation of
constant voltage method is that its efficiency is low as the PV panel has to be
disconnected from the load for measurement of the open circuit voltage
(Voc). In the presented paper, the authors have removed this limitation by
using a pilot PV panel for measurement of Voc. A proportional-integrator (PI)
based controller is used in implementation of constant voltage MPP
technique and the modeling is done in MATLAB®/SIMULINK simulation
environment. The simulation results are presented and discussed in the paper,
the results shows that the efficiency of the system has increased.
A Discrete PLL Based Load Frequency Control of FLC-Based PV-Wind Hybrid Power...IAES-IJPEDS
The sun and wind-based generation are considered to besource of green
power generation which can mitigate the power demand issues. As solar and
wind power advancements are entrenched and the infiltration of these
Renewable Energy Sources (RES) into to network is expanding dynamically.
So, as to outline a legitimate control and to harness power from RES the
learning of natural conditions for a specific area is fundamental. Fuzzy Logic
Controller (FLC) based Maximum Power Point Tracking (MPPT) controlled
boost converter are utilized for viable operation and to keep DC voltage
steady at desired level. The control scheme of the inverter is intended to keep
the load voltage and frequency of the AC supply at aconstant level regardless
of progress in natural conditions and burden. A Simulink model of the
proposed Hybrid system with the MPPT controlled Boost converters
and Voltage regulated Inverter for stand-alone application is developed in
MATLAB R2015a, Version 8.5.0. The ongoing information of Wind Speed
and Solar Irradiation levels are recorded at BITS-Pilani, Hyderabad Campus
the performance of the voltage regulated inverter under constant and varying
linearAC load is analyzed. The investigation shows that the magnitude of
load voltage and frequency of the load voltage is maintained at desired level
by the proposed inverter control logic.
An Adaptive Virtual Impedance Based Droop Control Scheme for Parallel Inverte...IAES-IJPEDS
This paper presents an adaptive virtual impedance based droop control
scheme for parallel inverter operation in low voltage microgrid. Because it is
essential to achieve power sharing between inverters in microgrid, various
droop control schemes have been proposed. In practice, the line impedance
between inverters and the point of common coupling (PCC) in microgrid are
not always equal. This imbalance in line impedance often results in a reactive
power mismatch among inverters. This problem has been solved by
introducing a virtual impedance loop in the conventional droop control
scheme. However, the reactive power sharing performance of this method is
still deteriorated when the line impedances change during operation. To
overcome such a problem, a new control scheme that is based on a virtual
impedance loop and an impedance estimation scheme is proposed.
To monitor the changes in line impedances, the impedance estimator is
implemented by using the output voltages and currents of inverters as well as
the voltages at the PCC. To compensate for the reactive power mismatch due
to the line impedance changes, the estimated line impedance is fed to the
virtual impedance loop in which it adjusts the virtual impedance value.
Comparative simulation results with the conventional ones verify the
effectiveness of the proposed adaptive virtual impedance based droop control
scheme.
Open-Switch Fault-Tolerant Control of Power Converters in a Grid-Connected Ph...IAES-IJPEDS
This paper presents the study of an open switch fault tolerant control of a
grid-connected photovoltaic system. The studied system is based on the
classical DC-DC boost converter and a bidirectional 6-pulse DC-AC
converter. The objective is to provide an open-switch fault detection method
and fault-tolerant control for both of boost converter and grid-side converter
(GSC) in a grid-connected photovoltaic system. A fast fault detection method
and a reliable fault-tolerant topology are required to ensure continuity of
service, and achieve a faster corrective maintenance. In this work, the mean
value of the error voltages is used as fault indicator for the GSC, while, for
the boost converter the inductor current form is used as fault indicator. The
fault-tolerant topology was achieved by adding one redundant switch to the
boost converter, and by adding one redundant leg to the GSC. The results of
the fault tolerant control are presented and discussed to validate the proposed
approach under different scenarios and different solar irradiances.
An Approach to Voltage Quality Enhancement by Introduction of CWVM for Distri...IAES-IJPEDS
This paper presented with problems related with voltage flicker in power
system networks. Several international standard issued to control the voltage
flicker are briefly described and some important methods to analyse
electrical circuits with sinusoidal and non-sinusoidal waveforms are
introduced and evaluated. One of these methods-Cockcroft Walton Voltage
Multiplier (CWVM) has been used to increase the voltage of a filter, which is
also described in this paper as a practical application. The filter can
compensate for harmonic currents, power factor, and unbalance voltage.The
simulation results using Multisimare presented, showing that good dynamic
and steady-state response can be achieved with this approach.
Electric Power Converter with a Wide Input Voltage RangeIAES-IJPEDS
The electric power converter for downhole telemetry systems of oil-well
pumps include a downhole block connected to the pump that contains
electronic circuits required for the operation of the motor pump sensors
and transmission of data about their condition to the surface are described.
A few methods of electric power conversion for this purpose are considered.
The circuit contained two steps of voltage converting are proposed.
The electrical scheme of this method is considered in the article. Proposed
decisions are simulated and verified experimentally. The input high supply
voltage range (200-4200 V) without loss of efficiency (even temporary) was
obtained. The results of simulation and experimental studies have shown
very close results.
Design and Implementation of Real Time Charging Optimization for Hybrid Elect...IAES-IJPEDS
Electric vehicle (EV) has gained incredible interest from the past two decade
as one of the hopeful greenhouse gasses solution. The number of Electric
Vehicle (EV) is increasing around the world; hence that making EVs user
friendly becomes more important. The main challenge in usage of EV is the
charging time required for the batteries used in EV. As a consequence, this
subject matter has been researched in many credentials where a wide range
of solutions have been proposed. However those solutions are in nature due
to the complex hardware structure. To provide an unswerving journey
an Android application based charging optimization is proposed.
This application is aimed at giving relevant information about the EV’s
battery state of charge (SOC), accurate location of the EV, booking of the
charging slots using token system and route planner. At emergency
situations, an alternative service is provided by mobile charging stations.
Route planner indicates the temperature by which prediction of reaching the
destination can be done. In addition to that nearest places such as parks,
motels are indicated. The estimated time and distance between the electric
vehicle and the charging station is calculated by the charging station server
according to which the parking lot is allocated. Vehicle to charging station
communication is established for the time estimation of charging. This will
help the EV users to know about charge status and charging station, which
support fast charging method and availability of the station on the go
and also when to charge their EV. The Arduino UNO board has been used
for the hardware part. The hardware results are confirming the conceptual of
the proposed work.
Performance Analysis of Photovoltaic Induction Motor Drive for Agriculture Pu...IAES-IJPEDS
This paper presents water pumping system using renewable source (solar)
without the use of chemical storage batteries. In this converter-inverter
circuit is used to drive Induction motor. The Converter used here is Two
Inductor boost converter (TIBC), which consists of a resonant tank, voltage
doubler rectifier and a snubber circuit. TIBC is designed to drive the three
phase induction motor from PV energy. TIBC converter is also known as
current fed multi resonant converter having high voltage gain and low input
current ripple. Converter switches are controlled through hysteresis controller
and ZCS resonant topologies. Solar PV power fluctuates according to
irradiation level of sunlight and hence tracking of maximum power at all
time is mandatory. SPWM control with third harmonic injection is used to
trigger the IGBT’s in the inverter. The development is oriented to achieve a
more efficient, reliable, maintenance free and cheaper solution than the
standard ones, that uses DC motors or low voltage synchronous motors.
The proposed method is verified with MATLAB/SIMULINK and the system
simulation confirms the performance of the proposed system.
Comparison of Sine and Space Vector Modulated Embedded Z-Source Inverter fed ...IAES-IJPEDS
This paper deals with performance of photovoltaic powered Embedded
Z-Source Inverter (EZSI) fed Induction motor drive. The DC output from the
PV-Panel is boosted and converted into AC using Embedded Z-Source
Inverter. EZSI system based on the concept of Z-Source Inverter (ZSI),
which provides single stage power conversion. The EZSI also produce same
voltage gain as that of the ZSI based system. In EZSI the DC source is
embedded within the X-shaped LC impedance network, due to this EZSI has
the added advantage of inherent source filtering capability, this can be
achieved without any extra passive filter. EZSI can produce the AC output
voltage which is greater than the DC link voltage. EZSI system also provides
ride-through capability under voltage sags. In this paper the performance of
space vector modulated EZSI fed Induction Motor Drive is compared with
sinusoidal PWM controlled EZSI fed Drive system. The PV powered EZSI
fed three phase Induction Motor System is designed, modeled and simulated
using MAT LAB-SIMULINK and the corresponding results are presented.
This drive system has advantages like voltage boosting ability and reduced
harmonic content.
Single-Phase Multilevel Inverter with Simpler Basic Unit Cells for Photovolta...IAES-IJPEDS
This paper presents a single-phase multilevel inverter (MLI) with simpler
basic unit cells. The proposed MLI is able to operate in two modes, i.e.
charge mode to charge the batteries, and inverter mode to supply AC power
to load, and therefore, it is inherently suitable for photovoltaic (PV) power
generation applications. The proposed MLI requires lower number of power
MOSFETs and gate driver units, which will translate into higher cost saving
and better system reliability. The power MOSFETs in the basic unit cells
and H-bridge module are switched at near fundamental frequency, i.e. 100
Hz and 50 Hz, respectively, resulting in lower switching losses. For low total
harmonic distortion (THD) operation, a deep scanning method is employed
to calculate the switching angles of the MLI. The lowest THD obtained is
8.91% at modulation index of 0.82. The performance of the proposed MLI
(9-level) has been simulated and evaluated experimentally. The simulation
and experimental results are in good agreement and this confirms that the
proposed MLI is able to produce an AC output voltage with low THD.
A DC Inrush Current Minimisation Method using Modified Z-Source Inverter in A...IAES-IJPEDS
The adjustable speed drives employ PWM converter-inverter system in order
to obtain unity power factor. The DC inrush current in DC link capacitors of
the rectifier limits the operation of power devices. Hence, this paper proposes
a new approach to reduce the DC inrush current by employing modified
Z-source inverter in a Adjustable Speed Drive system. The operating
principles, design procedure and simulation results are shown and compared
with the conventional Z-Source inverter.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
2. IJPEDS ISSN: 2088-8694
Photovoltaic System with SEPIC Converter Controlled by the Fuzzy Logic (Meryem Oudda)
1284
The control of this SEPIC converter is a much discussed and invested very subject. Indeed, this
converter is nonlinear in nature and different approaches have been used to control it. Conventional control
modes such as voltage mode control and current mode control require a good knowledge of the converter and
therefore a fairly accurate model [1]. Proportional-integral Control for SEPIC Converter is presented by S.
Venkatanarayanan et al 2014 [8], Current mode control and PI Controller have been proposed by Tadi G L
Krishna Reddy et al 2013 [9].
These controllers are easy to implement and simple to design, but their performance generally
depends on the operating point so that too large disturbance, wide load variation ranges or supply voltage
variations can make the choice of the parameters very difficult for different operating conditions.
However, a very different approach is offered by the fuzzy logic control (FLC), which does not
require precise mathematical model or complex calculation [10]. The fuzzy control technique is based
primarily on human understanding of the process control and on qualitative rules. The objective of this
research is to develop a fuzzy voltage regulator for a SEPIC converter. This paper is organized as follows. In
section 2, the photovoltaic array model is presented. Section 3 presents the SEPIC converter, while the design
of the fuzzy logic controller for the SEPIC converter has been done in section 4. Simulation results are shown
in section 5. Finally conclusion is given in section 6.
2. PHOTOVOLTAIC ARRAY MODEL
Photovoltaic is the field of technology and research related to the devices which directly convert
sunlight into electricity using semiconductors that exhibit the photovoltaic effect. Photovoltaic cells convert
solar radiation directly into DC electrical energy [11]. The photovoltaic panel is composed of many cells,
placed in series Ns or in shunt Nsh. Where it can be modelled by current source connected in parallel with
diode according with shunt and series resistor noted by and as illustrated in Figure 1 [12].
The output current is given by the following equations:
(1)
* ( ) + (2)
: Photo-current : Ideality factor
: Boltzmann’s constant : Cell temperature
: Diode current Series resistance
: Saturation current : Electronic charge
: Shunt resistance : Cell voltage
: Cell current
Figure 1. Photovoltaic array circuit
Typically, the shunt resistance ( ) is very large and the series resistance ( ) is very small [13].
Therefore, it is common to neglect these resistances in order to simplify the solar cell model. The resultant
ideal voltage-current characteristic of a photovoltaic cell is given by equation (3).
[ ( )
] (3)
3. ISSN: 2088-8694
IJPEDS Vol. 7, No. 4, December 2016 : 1283 – 1293
1285
Figure 2 and Figure 3 show the behavior of a photovoltaic module simulation in accordance to solar
radiation variation and at a constant temperature.
Figure 2. I–V curves of solar PV module used in this
study under different solar irradiance and constant
temperature 25°C
Figure 3. P–V curves of solar PV module used in this
study under different solar irradiance and constant
temperature 25°C
As we can see in the curve of the Figure above (Figure 2), the current increase is highly affected by
the solar radiation.
3. DC-DC/SEPIC CONVERTER
A DC-DC converter with simpler structure and higher efficiency has been an active research topic in
the power electronics [14]. The proposed converter is based on DC to DC converter to maintain the constant
output voltage [1]. Single Ended Primary Inductor Converter (SEPIC) converter consists of a switch S with
duty cycle , a diode, two inductors L1 and L2, two capacitors C1 and C2 and a load resistor. The circuit
diagram of a SEPIC converter is shown in Figure 4.
A SEPIC is a type of DC-DC converter [15]; allowing the electrical potential (voltage) at its output
to be less than, greater than, or equal to that at its input; the output of the SEPIC is controlled by the duty
cycle of the control transistor. SEPIC is effectively a boost converter followed by a buck-boost converter,
consequently it is like to a conventional buck-boost converter, other than has advantages of having
non-inverted output (the output has the same voltage polarity as the input), passing through a series capacitor
to couple energy from the input to the output (and thus can respond more gracefully to a short-circuit output),
and being able of factual shutdown: after the switch “S” is turned off, its output drops to 0 V, following a
rather hefty transient abandon of charge [16]. Figure 4 shows a simple circuit diagram of a SEPIC converter
can both step up and step down the input voltage, while maintaining the same polarity and the same ground
reference for the input and output.
Figure 4. Simple circuit diagram of the SEPIC converter
1000 W/m2
900 W/m2
800 W/m2
700 W/m2
1000
W/m2
900 W/m2
800 W/m2
700 W/m2
S
4. IJPEDS ISSN: 2088-8694
Photovoltaic System with SEPIC Converter Controlled by the Fuzzy Logic (Meryem Oudda)
1286
Figure 5 shows the circuit when the power switch is turned on and off (respectively in
Figures a and b). Figure 5a When the switch is turned on; the first inductor; is charged from the input
voltage source during this time. The second inductor takes energy from the first capacitor , and the output
capacitor is left to provide the load current.
Figure 5.a. On state (switch is on) Figure 5.b. Off state (switch is off)
Figure 5. Equivalent circuit diagram of the SEPIC converter when the switch is ON and OFF
When the switch is turned on, the input inductor is charged from the source, and the second inductor
is charged from the first capacitor. No energy is supplied to the load capacitor during this time. Inductor
current and capacitor voltage polarities are marked in this Figure. When the power switch is turned off, the
energy stored in inductor is transferred to .The energy stored in is transferred to through the diode
and supplying the energy to load [9], as shown in Figure 5.b. The second inductor is also connected to the
load during this time. The output capacitor sees a pulse of current during the off time, making it inherently
noisier than a buck converter. The amount that the SEPIC converters increase or decrease the voltage depends
primarily on the duty cycle and the parasitic elements in the circuit.
The output of an ideal SEPIC converter is:
(4)
A SEPIC converter is to process the electricity from the PV system. This converter either increases
or decreases the PV system voltage at the load. The proposed SEPIC converter operates in buck mode.
4. THE FUZZY LOGIC CONTROLLER FOR THE SEPIC CONVERTER
In fuzzy logic controller (FLC) design, one should identify the main control variables and determine
the sets that describe the values of each linguistic variable. The input variables of the FLC are the output
voltage error ( ) and the change of this error ( ) of the SEPIC converter. The output of the FLC is
the duty cycle of ( ) of the PWM signal, which regulates the output voltage. The triangular membership
functions are used for the FLC for easier computation. A five-term fuzzy set, i.e., negative big (NB), negative
small (NS), zero (Z), Positive small (PS), and positive big (PB), is defined to describe each linguistic
variable. The fuzzy rules of the proposed SEPIC DC-DC converter can be represented in a symmetric form
(table 1).For the output variable ( ), five-term fuzzy is defined to give sharpness to the regulation: negative
big (NB), negative small (NS), zero (Z), Positive small (PS) and positive big (PB). The variables of the FLC
for the SEPIC converter are as follow:
The first input is the error in the output voltage ( )
) ) (5)
The second input is the variation (the change) in error ( )
) ) ) (6)
The single output variable ( ) is duty cycle.
Where
a. : is the reference output voltage;
b. ) is the measured output voltage in the Kth
sample;
5. ISSN: 2088-8694
IJPEDS Vol. 7, No. 4, December 2016 : 1283 – 1293
1287
The Block diagram of the control SEPIC converter with the Fuzzy Logic controller is presented in
Figure 6, where ) is sent to the PWM generator. PWM generator generates the necessary switching signal
for the switch in the converter.
a. is the control gain of input ;
b. is the control gain of input );
c. is the control gain of output. .
Figure 6. Block diagram of Fuzzy Logic controller for the SEPIC converter
The membership functions and for and respectively are represented in
Figure 7a. The membership function for the output variable is represented in Figure 7.b. All the functions
are defined on a normalized interval [ ]. The rules of the fuzzy logic controller are shown in Table 1.
Figure 7a. Membership functions for
and
Figure 7b. Membership function for
Figure 7. Membership functions for the input and output variables
𝐊 𝛂
SEPIC
Converter
𝐞𝐕𝐨𝐮𝐭
𝐊 𝐞𝐕 𝐨𝐮𝐭
𝐕𝐑𝐞𝐟
𝐊 𝐞𝐕 𝐨𝐮𝐭
𝐞𝐕𝐨𝐮𝐭
𝐕𝐨𝐮𝐭
𝟏
𝒁
𝛂
Fuzzy Logic
Controller
FLC
PWM
Pulse Generator
𝛂
𝛍 𝐞𝐕 𝐨𝐮𝐭
𝛍 𝐞𝐕 𝐨𝐮𝐭
𝐞𝐕𝐨𝐮𝐭 𝐞𝐕𝐨𝐮𝐭
-1.0-0.5 0.0 0.5 1.0
NB NS Z PS PB
𝛍 𝛂
-1.0-0.5 0.0 0.5 1.0
NB NS Z PS PB
𝛂
6. IJPEDS ISSN: 2088-8694
Photovoltaic System with SEPIC Converter Controlled by the Fuzzy Logic (Meryem Oudda)
1288
Table 1. Fuzzy control rules
NB NS Z PS PB
NB NB NB NB NS Z
NS NB NB NS Z PB
Z NB NS Z PS PB
PS NS Z PS PB PB
PB Z PS PB PB PB
Fuzzy control rules are derived from the analysis of the converter behavior:
a. When the output of the converter is far from the set point (Positive Big or Negative Big), the duty
cycle should be close to zero or one so as to bring to the set point quickly.
b. When the output of the converter is approaching to the set point (Negative Small or Positive Small),
a small change of the duty cycle is necessary.
c. When the output of the converter is approaching very close to the set point, duty cycle must be kept
constant in order to prevent the overshoot.
5. SIMULATION RESULTS
The photovoltaic array that we use in this paper is SCHOTT Solar (SCHOTT POLYTM
210); the
characteristics of this array are given in Table 2.
Table 2. Electrical data apply to standard test conditions (STC): (T=25°C, G=1000 W/m2
)
Variable Value
Maximum Power Pmax= 210 W
Open circuit voltage Voc = 36.1 V
Short circuit current Isc = 7.95 A
Voltage at maximum power Vmax = 29.3 V
Current at maximum power Imax = 7.16 A
Figure 8 and Figure 9 show the simulation result of the PV model.
Figure 8. Current-Voltage characteristic Figure 9. Current-Power characteristic
The parameters of the SEPIC converter used in this study are given in Table 3. In the full model; the
SEPIC converter is connected to the PV panel, and the duty cycle of this is controlled using the Fuzzy Logic
Controller. The results are provided under standard test conditions; G=1000 W/m2
and T=25°C. Figure 10
shows the simulation results obtained from the model; Vout=24V; Iout=3.25A and Power= 78 W. According
this Figure (Figure 10) we notice that since the time 0.1S the model gave a stable voltage (24 V), and thus a
current and a power so stable. To prove the efficiency of the integration of SEPIC converter controlled by the
fuzzy logic controller for the photovoltaic system, we have studying the influence of the temperature and the
solar irradiation separately.
7. ISSN: 2088-8694
IJPEDS Vol. 7, No. 4, December 2016 : 1283 – 1293
1289
Table 3. The simulation parameters of SEPIC converter
Variable Value
Switching frequency 20 KHz
Input Voltage (Vin) Vin = 29.3 V
Output Voltage (Vout) Vout = 24 V
Load resistance Rload = 7.38 Ω
Inductance L1 L1 = 460 µH
Inductance L2 L2 = 460 µH
Capacitor C1 C1 =8.4 µF
Capacitor C2 C2 = 0.0163 F
Figure 10. Voltage, current and power output results; at G=1000 W/m2
and T=25°C
5.1. Influence of Temperature
For stable irradiation (G=1000 W/m2
), and for a variable temperature, we obtain the results shown
in the Figures.
Figure 11. Voltage, current and power output results; at G=1000 W/m2
and T=35°C
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
20
40
Vout
Curve
t [S]
V
out
[V]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
2
4
Iout
Curve
t [S]
I
out
[A]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
50
100
Power Curve
t [S]
Power[W]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
20
40
Vout
Curve
t [S]
V
out
[V]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
2
4
Iout
Curve
t [S]
I
out
[A]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
50
100
Power Curve
t [S]
Power[W]
8. IJPEDS ISSN: 2088-8694
Photovoltaic System with SEPIC Converter Controlled by the Fuzzy Logic (Meryem Oudda)
1290
Figure 12.Voltage, current and power output results; at G=1000 W/m2
and T=45°C
Figure 13. Voltage, current and power output results; at G=1000 W/m2
and T=55°C
From this three Figures above (Figure 11, Figure 12, and Figure 13) it is clear that for a variable
temperature value, we obtain the desired voltage (24 V), and it is so stable since 0.1S.
5.2. Influence of Irradiation
For stable temperature (T=25°C), and for a variable solar irradiation, we obtain the results shown in
the Figures. Figures Figure 14, Figure 15 and Figure 16 shows the simulation results obtained from the model
(T=25°C); for G=900W/m2
, G=800W/m2
and G=700W/m2
respectively. From the Figures 14, 15 and 16; it is
notable that the output voltage is 24 V, even if there are a variation in the solar irradiance. We summarize
from the results given from the study that the temperature and solar irradiation variations can be addressed by
the FLC controller, and this is observed, and generally the steady state is not exceeding 0.4 s.
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
20
40
Vout
Curve
t [S]
V
out
[V]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
2
4
Iout
Curve
t [S]
I
out
[A]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
50
100
Power Curve
t [S]
Power[W]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
20
40
Vout
Curve
t [S]
V
out
[V]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
2
4
Iout
Curve
t [S]
I
out
[A]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
50
100
Power Curve
t [S]
Power[W]
9. ISSN: 2088-8694
IJPEDS Vol. 7, No. 4, December 2016 : 1283 – 1293
1291
Figure 14. Voltage, current and power output results; at T=25°C and G=900 W/m2
Figure 15. Voltage, current and power output results; atT=25°C and G=800 W/m2
Figure 16. Voltage, current and power output results; atT=25°C and G=700 W/m2
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
20
40
Vout
Curve
t [S]
V
out
[V]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
2
4
Iout
Curve
t [S]
I
out
[A]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
50
100
Power Curve
t [S]
Power[W]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
20
40
Vout
Curve
t [S]
V
out
[V]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
2
4
Iout
Curve
t [S]
I
out
[A]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
50
100
Power Curve
t [S]
Power[W]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
20
40
Vout
Curve
t [S]
V
out
[V]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
2
4
Iout
Curve
t [S]
I
out
[A]
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
50
100
Power Curve
t [S]
Power[W]
10. IJPEDS ISSN: 2088-8694
Photovoltaic System with SEPIC Converter Controlled by the Fuzzy Logic (Meryem Oudda)
1292
6. CONCLUSION
The SEPIC performs the voltage conversion from positive source voltage to positive load voltage.
Due to the time variations and switching nature of the power converters, their dynamic behavior becomes
highly non-linear. In this paper; a stand-alone solar-PV energy generation system with a SEPIC; DC-DC
converter controlled by a Fuzzy Logic Controller has been designed and the efficiency of the system has been
presented under variation in temperature and solar irradiation. This study has successfully demonstrated the
design, analysis and suitability of fuzzy logic controller for SEPIC converter.
REFERENCES
[1] Mahendran. G, Kandaswamy. K.V," Ant Colony Optimized Tuned DC-DC Converter", International Journal of
Computer Applications (0975–8887). International Conference on Innovations In Intelligent Instrumentation,
Optimization And Signal Processing “ICIIIOSP-2013”
[2] James Dunia, Bakari M.M. Mwinyiwiwa, "Performance Comparison between ĆUK and SEPIC Converters for
Maximum Power Point Tracking Using Incremental Conductance Technique in Solar Power Applications",
International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering Vol: 7, No:
12, 2013. World Academy of Science, Engineering and Technology
[3] F. Yusivar, M.Y. Farabi, R. Suryadiningrat, W.W. Ananduta, and Y. Syaifudin, "Buck-Converter Photovoltaic
Simulator", International Journal of Power Electronics and Drive System Vol. 1, No. 2, December 2011, pp.
156~167.
[4] Sweta Srivastav, Sanjay Singh., "An Introduction To Sepic Converters", International Referred Research Journal,
July, 2011.ISSN-0975-3486, RNI: RAJBIL 2009/30097 VOL-II*ISSUE 22.
[5] S. Venkatanarayanan, M. Saravanan, "Fuzzy logic based PV energy system with SEPIC converter ", Journal of
Theoretical and Applied Information Technology Vol. 59, No. 1, 10th
January 2014.
[6] Ahmad H. El Khateb, NasrudinAbd Rahim, Jeyraj Selvaraj, "Fuzzy logic control approach of a maximum power
point.
[7] G. Thambi, S. Prem Kumar, Y.Murali Krishna, M. Aruna, "Fuzzy-Logic-Controller-Based SEPIC Converter for
MPPT in Standalone PV systems "International Research Journal of Engineering and Technology Vol: 02 Issue:
02, May-2015.
[8] S. Venkatanarayanan, M. Saravanan, "Proportional-integral Control for SEPIC Converter", Research Journal of
Applied Sciences, Engineering and Technology 8(5): 623-629, 2014.
[9] Tadi G L Krishna Reddy, Ramamurthyraju. P, Revanthkumar.V, "Analysis of SEPIC for PV-Applications using PI
Controller and Current Mode Control", International Journal for Scientific Research & Development Vol. 1, Issue
9, 2013.
[10] Kung. Y.S; Liaw. C.M, "A Fuzzy Controller improving a Linear Model Following Controller for Motor Drives",
IEEE Transactions on Fuzzy Systems VOL: 2, ISSUE 3, pages: 194-201, 1994.
[11] M. Abdulkadir, A.S. Samosir, A.H.M. Yatim, "Modeling and Simulation of a Solar Photovoltaic System, Its
Dynamics and Transient Characteristics in LABVIEW", International Journal of Power Electronics and Drive
System (IJPEDS), Vol. 3, No. 2, June 2013, pp. 185~192.
[12] H. Bouzeria, C. Fetha, T. Bahi, I. Abadlia, Z. Layate, S. Lekhchine," Fuzzy Logic Space Vector Direct Torque
Control of PMSM for Photovoltaic Water Pumping System", Energy Procedia 74 (2015) 760 – 771.
[13] Y.M. Chen, Y.C. Liu, S.C. Hung, and C.S. Cheng, " Multi-Input Inverter for Grid-Connected Hybrid PV/Wind
Power System", IEEE Transactions on Power Electronics Vol: 22, ISSUE 3, May 2007.
[14] S. Ganesh, J. Janani, G. Besliya Angel, "A Maximum Power Point Tracker for PV Panels Using SEPIC Converter",
International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering Vol: 8, No:
2, 2014. World Academy of Science, Engineering and Technology.
[15] Vijayabalan R, S. Ravivarman, "Z Source Inverter for Photovoltaic System with Fuzzy Logic Controller",
International Journal of Power Electronics and Drive System (IJPEDS), International Journal of Power
Electronics and Drive System (IJPEDS), Vol. 2, No. 4, December 2012, pp. 371~379.
[16] A. Ramkumar, S. Vijula Shini Florence, "Analysis of Single Phase AC-DC SEPIC Converter using Closed Loop
Techniques", International Journal of Advanced Research in Electrical, Electronics and Instrumentation
Engineering Vol. 4, Issue 2, February 2015.
BIOGRAPHIES OF AUTHORS
Meryem Oudda received her LSc and MSc degrees in electrical engineering from TAHRI
Mohamed Bechar University, Algeria, in 2009 and 2011 respectively, where she has been
working toward the doctoral degree in the Department of Electric and Electronics Engineering
since January 2012. She is currently a research member at the research laboratory: Command
Analyses and Optimization of Electro-Energetic Systems, TAHRI Mohamed Bechar University,
Algeria.
11. ISSN: 2088-8694
IJPEDS Vol. 7, No. 4, December 2016 : 1283 – 1293
1293
Hazzab Abdeldjebar received his State Engineer, M.S., and Ph.D degrees in Electrical
Engineering from the Electrical Engineering Institute of The University of Sciences and
Technology of Oran (USTO), Algeria in 1995, 1999, and 2006, respectively. He is currently a
Professor of Electrical Engineering at the University of Bechar (Algeria), where he has been the
Director of the Research Laboratory of Command, Analyses, and Optimization of Electro-
Energetic Systems since 2009. His research interests include power quality, modeling, modern
controller and observer design for nonlinear systems, control of power electronics, multidrive
systems and electrical vehicle, and adaptive control and nonlinear systems diagnostic.