This document summarizes a research paper that proposes a distributed generation (DG) interfacing scheme using a dual active power filter (APF) configuration. The scheme involves a DG inverter that initially acts as an inverter to feed 5KW of active power from the DG source to the grid. At 0.2 seconds, the DG inverter then acts as an APF along with the dual APF setup to provide harmonic compensation. Control strategies are presented for operating the DG inverter in inverter and APF modes using simple control techniques. Instantaneous active and reactive power (PQ) theory is used to control the dual APF configuration. Simulation results are shown verifying the DG inverter can
Grid Connected Distributed Generation System with High Voltage Gain Cascaded ...IJECEIAES
The paper presents distributed generation (DG) system in grid connected mode of operation with asymmetric multi-level inverter (AMLI) topology. Cascaded type DC-DC converter is employed to feed proposed AMLI topology. The DG output voltage (generally low voltage) is stepped up to the required level of voltage using high-gain DC-DC converter. Proposed AMLI topology consists of capacitors at the primary side. The output of high-gain DC-DC converter is fed to split voltage balance single-input multi-output (SIMO) circuit to maintain voltage balance across capacitors of AMLI topology. Cascaded DC-DC converters (both high-gain converter and SIMO circuit) are operated in closed-loop mode. The proposed AMLI feeds active power to grid converting DC type of power generated from DG to AC type to feed the grid. PWM pattern to trigger power switches of AMLI is also presented. The inverting circuit of MLI topology is controlled using simplified I d -I q control strategy in this paper. With the proposed control theory, the active power fed to grid from DG is controlled and power factor is maintained at unity. The proposed system of DG integration to grid through cascaded DC-DC converters and AMLI structure is validated from fixed active power to grid from DG condition. The proposed system is developed and results are obtained using MATLAB/SIMULINK software.
OPTIMAL CURRENT REGULATION STRATEGY FOR THREE-PHASE BACK-TOBACK ACTIVE POWER ...Ijorat1
Abstract: The objective of this paper is to propose a three phase back-to-back power conditioner with optimal a current
regulation strategy in microgrid. To achieve high stability ,the frequency and the voltage of the microgrid is controlled
by using bidirectional power flow control .The active and reactive power of Active Power Conditioner(APC) is used
here. The dc-link capacitor is the main component of the back-to-back power conditioner for power decoupling and
power flow balancing. Optimal current regulation strategy is developed to improve the power quality and stability of
the micro grids as well as to reduce the dc link capacitance. Under steady state, the optimal ac current regulation is
able to achieve the dc-link voltage regulation and to reduce the injected ac line current variation. Simulation result was
used to demonstrate the feasibility and performance of the proposed active power conditioner.
Comparative of Conventional and Intelligence Controller based Hybrid Generati...IJERD Editor
Harmonic pollution of the power supply system has risen significantly in recent years due primarily
to an increase of non-linear loads connected to the utility through residential, commercial and industrial
customers. This paper, proposed a solution to eliminate the harmonics introduced by the nonlinear loads in
steady and in transients. It presents a predictive current control strategy for achieving maximum benefits from
these grid-interfacing inverters implementing conventional DC link controller and intelligence controller, when
installed in 3-phase 4-leg voltage source inverter (VSI). The inverter is controlled to perform as a multi-function
device by incorporating active power filter functionality. The use of a four-leg voltage-source inverter allows
the compensation of current harmonic components, as well as unbalanced current generated by three-phase
nonlinear loads. Renewable energy resources (RES) are being increasingly connected in distribution systems
utilizing power electronic converters. The compensation performance of the proposed active power filter and the
associated hybrid PV/Wind system generation scheme with new control scheme is demonstrated to improve the
power quality features is simulated using MATLAB/SIMULINK.
A non-isolated tri-port converter is a fully compact and functional system by the integration of basic converters. This can be used for renewable energy applications. This converter is capable of achieving different switching patterns of power flow between the source and load, interfaced sources of various voltage and current levels with the dc grid. This tri-port converter has to be used for continuous power distribution of rechargeable battery, photovoltaic panels and load. Due to the implementation of this dc-dc converter some operations like buck, boost and buck-boost operations became easy. Use of this converter helps in easy implementation of the system. The solar PV panel implementation boosts the system to a high level and bidirectional flow became easy from source to load and vice versa.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Grid Connected Distributed Generation System with High Voltage Gain Cascaded ...IJECEIAES
The paper presents distributed generation (DG) system in grid connected mode of operation with asymmetric multi-level inverter (AMLI) topology. Cascaded type DC-DC converter is employed to feed proposed AMLI topology. The DG output voltage (generally low voltage) is stepped up to the required level of voltage using high-gain DC-DC converter. Proposed AMLI topology consists of capacitors at the primary side. The output of high-gain DC-DC converter is fed to split voltage balance single-input multi-output (SIMO) circuit to maintain voltage balance across capacitors of AMLI topology. Cascaded DC-DC converters (both high-gain converter and SIMO circuit) are operated in closed-loop mode. The proposed AMLI feeds active power to grid converting DC type of power generated from DG to AC type to feed the grid. PWM pattern to trigger power switches of AMLI is also presented. The inverting circuit of MLI topology is controlled using simplified I d -I q control strategy in this paper. With the proposed control theory, the active power fed to grid from DG is controlled and power factor is maintained at unity. The proposed system of DG integration to grid through cascaded DC-DC converters and AMLI structure is validated from fixed active power to grid from DG condition. The proposed system is developed and results are obtained using MATLAB/SIMULINK software.
OPTIMAL CURRENT REGULATION STRATEGY FOR THREE-PHASE BACK-TOBACK ACTIVE POWER ...Ijorat1
Abstract: The objective of this paper is to propose a three phase back-to-back power conditioner with optimal a current
regulation strategy in microgrid. To achieve high stability ,the frequency and the voltage of the microgrid is controlled
by using bidirectional power flow control .The active and reactive power of Active Power Conditioner(APC) is used
here. The dc-link capacitor is the main component of the back-to-back power conditioner for power decoupling and
power flow balancing. Optimal current regulation strategy is developed to improve the power quality and stability of
the micro grids as well as to reduce the dc link capacitance. Under steady state, the optimal ac current regulation is
able to achieve the dc-link voltage regulation and to reduce the injected ac line current variation. Simulation result was
used to demonstrate the feasibility and performance of the proposed active power conditioner.
Comparative of Conventional and Intelligence Controller based Hybrid Generati...IJERD Editor
Harmonic pollution of the power supply system has risen significantly in recent years due primarily
to an increase of non-linear loads connected to the utility through residential, commercial and industrial
customers. This paper, proposed a solution to eliminate the harmonics introduced by the nonlinear loads in
steady and in transients. It presents a predictive current control strategy for achieving maximum benefits from
these grid-interfacing inverters implementing conventional DC link controller and intelligence controller, when
installed in 3-phase 4-leg voltage source inverter (VSI). The inverter is controlled to perform as a multi-function
device by incorporating active power filter functionality. The use of a four-leg voltage-source inverter allows
the compensation of current harmonic components, as well as unbalanced current generated by three-phase
nonlinear loads. Renewable energy resources (RES) are being increasingly connected in distribution systems
utilizing power electronic converters. The compensation performance of the proposed active power filter and the
associated hybrid PV/Wind system generation scheme with new control scheme is demonstrated to improve the
power quality features is simulated using MATLAB/SIMULINK.
A non-isolated tri-port converter is a fully compact and functional system by the integration of basic converters. This can be used for renewable energy applications. This converter is capable of achieving different switching patterns of power flow between the source and load, interfaced sources of various voltage and current levels with the dc grid. This tri-port converter has to be used for continuous power distribution of rechargeable battery, photovoltaic panels and load. Due to the implementation of this dc-dc converter some operations like buck, boost and buck-boost operations became easy. Use of this converter helps in easy implementation of the system. The solar PV panel implementation boosts the system to a high level and bidirectional flow became easy from source to load and vice versa.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
A battery-less energy harvesting interface circuit to extract electrical energy from vibration has been proposed in this paper for low power applications. The voltage doubler integrated with DC – DC boost converter circuits were designed and simulated using MultiSIM software. The circuit was then fabricated onto a printed circuit board (PCB), using standard fabrication process. The Cockcroft Walton doubler was chosen to be implemented in this study by utilizing diode-capacitor topologies with additional RC low pass filter. The DC – DC boost converter has been designed using a CMOS step -up DC – DC switching regulators, which are suitable for low input voltage system. The achievement of this interface circuit was able to boost up the maximum voltage of 5 V for input voltage of 800 mV.
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.
A Two-Input Dual Active Bridge Converter for a Smart User Network Using Integ...Alessandro Burgio
The current on the low voltage side of the high
frequency transformer of a dual active bridge converter is
subject to rapid rising and falling edge; in designing the
converter, the peak current is a key factor to achieve robustness
and reliability. To limit the peak current, the adoption of a
further inductor in series with the transformer is a feasible
solution. In this paper the authors propose a novel topology for a
DAB converter useful to deeply reduce the peak current. The
authors also present a 1kW prototype of a DAB converter
implementing the proposed topology and built using integrated
power modules in place of discrete ones. The results of a
laboratory test clearly demonstrated the good dynamic response
of the DAB converter considering a deep step change in power
balancing.
Enhancement in Power Quality With Grid Interconnection of Renewable Energy So...IJERA Editor
At present the Renewable energy resources (RES) are being increasingly connected in distribution systems utilizing power electronic converters. This paper presents a novel control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as power converter to inject power generated from RES to the grid and shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. All of these functions may be accomplished either individually or simultaneously. With such a control, the combination of grid-interfacing inverter and the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appears as balanced linear load to the grid. This new control concept is demonstrated with extensive MATLAB/Simulink simulation studies and validated through digital signal processor-based laboratory experimental results.
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.
The intention of this paper is to identify a suitable controller for closed loop multi converter system for multiple input sources and to improve time response of high-gain-step up-converter. Closed-loop Multi Converter System (MCS) is utilized to regulate load-voltage. This effort recommends suitable-controller for closed-two loop-controlled-SEPIC-REBOOST Converter fed DC motor. The estimation of the yield in open-two loop and closed- two-loop-circuit has been done using MATLAB or Simulink. Closed-two loop-control of Multi Converter System with Propotional+Integral (PI)- Propotional+Integral (PI) and Proportional+Resonant (PR) - Proportional+Resonant (PR) Controllers are investigated and their responses are evaluated in conditions of rise time, peak time, settling time and steady state error. It is seen that current-mode PR-PR controlled MCS gives better time domain response in terms of motor speed. A Prototype of MCS has been fabricated in the laboratory and the experimental-results are authenticated with the simulation-results.
This work deals with the Power Factor Corrected Single-Ended Primary Inductor Converter (PFC-SEPIC) based voltage fed closed loop full bridge series resonant induction heating system for household induction heating applications. The output voltage of the front end PFC-SEPIC converter fed series resonant inverter governs the controllers, which may be PI controller or Fuzzy Logic Controller (FLC). The analysis and comparison of time responses are presented in this paper. The PFC-SEPIC converter is used to improve the output power and the THD of source side current are compared for PI and FLC controllers. PFC-SEPIC converter maintains improved current and voltage at unity power factor through the input mains. The SEPIC converter based Voltage Fed Full Bridge Series Resonant Inverter (VFFBSRI) converts the voltage at a frequency of 10 kHz to a level suitable for household induction heating. A 1 kW SEPIC converter based VFFBSRI with RLC load is designed and simulated using MATLAB/ Simulink and hardware is fabricated.
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.
Supply Power Factor Improvement in Ozone Generator System Using Active Power ...IJPEDS-IAES
Artificial Ozone Generating system needs High Voltage, High Frequency
supply. The Ozonator distorts the supply currents and henceforth affect the
supply power factor. This paper presents the performance comparison of
PWM inverter to Power Factor Corrected (PFC) converter with PWM
inverter based High-voltage High-frequency power supply for ozone
generator system. The conventional inverter has front end bridge rectifier
with smoothing capacitor. It draws non-sinusoidal current from ac mains; as
a result input supply has more harmonics and poor power factor. Hence,
there is a continuous need for power factor improvement and reduction of
line current harmonics. The proposed system has active power factor
correction converter which is used to achieve sinusoidal current and improve
the supply power factor. The active PFC converter with PWM inverter fed
ozone generator generates more ozone output compared to the conventional
inverter. Thus the proposed system has less current harmonics and better
input power factor compared to the conventional system. The performance of
the both inverters are compared and analyzed with the help of simulation
results presented in this paper.
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
Analysis of direct power control AC-DC converter under unbalance voltage supp...IJECEIAES
This paper presents an analysis of Direct Power Control (DPC) technique for the Three-Phase Pulse Width Modulation (PWM) AC-DC converter under unbalanced supply condition. Unbalance condition will cause the presence of unbalanced current and voltages thus produce the negative components on the grid voltage as well as severe performance degradation of a grid connected Voltage Source Inverter (VSI). The input structures for conventional DPC has been modified with a three simpler sequence networks instead of coupled by a detailed Three-Phase system method. The imbalance voltage can be resolved by separating from the individual elements of voltage and current into symmetrical components called Sequence Network. Consequently, the input power relatively improved during unbalanced condition almost 70% through the measurement of Total Harmonic Distortion (THD) from the conventional Direct Power Control (DPC) in individual elements which is higher compared to separate components. Hence, several analyses are performed in order to analyze the steady state and dynamic performance of the converter, particularly during the load and DC voltage output reference variations.
The proposed model automatically corrects the power factor without any human presence. It consist of a micro controller which detects the power factor value,if the power factor goes low during peak hours it automatically connects capacitor banks to improve it. The main aim of the model is to maintain the power factor as high as possible which helps to increase the efficiency of the system.
Design of Transformer less Single Phase Inverterijtsrd
Solar energy is the top of all renewable energy systems because of its pollution free, adaptable, long life, low maintenance cost and favoured options for sustainable development. Thus, this is used as the source of input for this model. The PV cell converts the solar energy into electrical energy. This energy is in DC form. This DC voltage is raised to the desired level with the help of boost converter dc dc converter .The boost converter is driven with the help of MOSFET. The boosted DC voltage is fed to the PWM inverter which converts the dc input into ac output. And finally, the output is given to the load. The proposed inverter system converts DC power into single phase AC power efficiently without using transformers and batteries. In this, the simulation results of a transformer less single phase inverter which uses a photovoltaic array as the input are shown. An inverter with DC link is designed for conversion of DC input into AC supply. The simulation is carried out with the help of MATLAB simulation software. The harmonic distortion is found to be 2.73 in the FFT analysis. Stebana Rose Mary. G | Swathy. V | Nisha. K | Anandhi. M "Design of Transformer less Single-Phase Inverter" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-6 , October 2021, URL: https://www.ijtsrd.com/papers/ijtsrd47549.pdf Paper URL : https://www.ijtsrd.com/engineering/electrical-engineering/47549/design-of-transformer-less-singlephase-inverter/stebana-rose-mary-g
Hysteresis SVM for Coupled Inductor Z Source Diode Clamped 3-Level Inverter B...IAES-IJPEDS
Due to its advantages such as it can defeat problems such as leakage current
and insertion of DC in the grid and provides low stress on power devices,
Diode-clamped three-level inverter (DCTLI) is habitually used in
transformerless photovoltaic (PV) connected to grid network. But it still has
a problem of shoot-through which dwells in its legs, so its operation not
reliable. Z source network is employed to permit operation without shoot
through risk and improve its reliability. Coupled inductors are replaced the
line transformers in to attain lower cost, reduced size, and improved its
reliability and efficiency. Coupled inductor which avoids leakage current
problem and losses. It employs coupled inductor z source diode clamped
three level inverter (CI-Z-DC-TLI) to boost the voltage and further progress
the consistency of the proposed system by avoiding the shoot through the
problem. The proposed system assures that common-mode voltage
and shoot-through risk is avoided. Moreover, controlling DC-TLI with
Hysteresis SVM algorithm which improves output voltage and current
control. Simulation and experimental results of this proposed system were
analyzed using MATLAB environment and FPGA hardware.
Power Quality Improvement of Grid Interconnection of renewable Energy Based D...IJERA Editor
This paper presents a grid interfacing inverter which compensates power quality problems and also interface Renewable Energy Sources with the help of electric grid. Renewable Energy Sources are being increasingly connected in distribution system utilizing power electronic converters. Grid interfacing inverter can be used: 1) To improve the transfer of active power harvested from RES; 2) To meet load reactive power demand support ; 3) To reduce current harmonics by incorporating the current harmonic compensator at point of common coupling(PCC) ; 4) current unbalance and neutral current compensation in case of 3-phase 4-wire system. The fuzzy logic can be used in many applications especially, when the process/models are complex to analyse by using classical methods. Mainly fuzzy logic controller is used to control DC capacitor voltage. Simulations are carried out using MATLAB/SIMULINK to verify the performance of the controller. The output shows the controller has fast dynamic response high accuracy of tracking DC voltage reference and robust to load parameters variations.
A battery-less energy harvesting interface circuit to extract electrical energy from vibration has been proposed in this paper for low power applications. The voltage doubler integrated with DC – DC boost converter circuits were designed and simulated using MultiSIM software. The circuit was then fabricated onto a printed circuit board (PCB), using standard fabrication process. The Cockcroft Walton doubler was chosen to be implemented in this study by utilizing diode-capacitor topologies with additional RC low pass filter. The DC – DC boost converter has been designed using a CMOS step -up DC – DC switching regulators, which are suitable for low input voltage system. The achievement of this interface circuit was able to boost up the maximum voltage of 5 V for input voltage of 800 mV.
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.
A Two-Input Dual Active Bridge Converter for a Smart User Network Using Integ...Alessandro Burgio
The current on the low voltage side of the high
frequency transformer of a dual active bridge converter is
subject to rapid rising and falling edge; in designing the
converter, the peak current is a key factor to achieve robustness
and reliability. To limit the peak current, the adoption of a
further inductor in series with the transformer is a feasible
solution. In this paper the authors propose a novel topology for a
DAB converter useful to deeply reduce the peak current. The
authors also present a 1kW prototype of a DAB converter
implementing the proposed topology and built using integrated
power modules in place of discrete ones. The results of a
laboratory test clearly demonstrated the good dynamic response
of the DAB converter considering a deep step change in power
balancing.
Enhancement in Power Quality With Grid Interconnection of Renewable Energy So...IJERA Editor
At present the Renewable energy resources (RES) are being increasingly connected in distribution systems utilizing power electronic converters. This paper presents a novel control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as power converter to inject power generated from RES to the grid and shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. All of these functions may be accomplished either individually or simultaneously. With such a control, the combination of grid-interfacing inverter and the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appears as balanced linear load to the grid. This new control concept is demonstrated with extensive MATLAB/Simulink simulation studies and validated through digital signal processor-based laboratory experimental results.
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.
The intention of this paper is to identify a suitable controller for closed loop multi converter system for multiple input sources and to improve time response of high-gain-step up-converter. Closed-loop Multi Converter System (MCS) is utilized to regulate load-voltage. This effort recommends suitable-controller for closed-two loop-controlled-SEPIC-REBOOST Converter fed DC motor. The estimation of the yield in open-two loop and closed- two-loop-circuit has been done using MATLAB or Simulink. Closed-two loop-control of Multi Converter System with Propotional+Integral (PI)- Propotional+Integral (PI) and Proportional+Resonant (PR) - Proportional+Resonant (PR) Controllers are investigated and their responses are evaluated in conditions of rise time, peak time, settling time and steady state error. It is seen that current-mode PR-PR controlled MCS gives better time domain response in terms of motor speed. A Prototype of MCS has been fabricated in the laboratory and the experimental-results are authenticated with the simulation-results.
This work deals with the Power Factor Corrected Single-Ended Primary Inductor Converter (PFC-SEPIC) based voltage fed closed loop full bridge series resonant induction heating system for household induction heating applications. The output voltage of the front end PFC-SEPIC converter fed series resonant inverter governs the controllers, which may be PI controller or Fuzzy Logic Controller (FLC). The analysis and comparison of time responses are presented in this paper. The PFC-SEPIC converter is used to improve the output power and the THD of source side current are compared for PI and FLC controllers. PFC-SEPIC converter maintains improved current and voltage at unity power factor through the input mains. The SEPIC converter based Voltage Fed Full Bridge Series Resonant Inverter (VFFBSRI) converts the voltage at a frequency of 10 kHz to a level suitable for household induction heating. A 1 kW SEPIC converter based VFFBSRI with RLC load is designed and simulated using MATLAB/ Simulink and hardware is fabricated.
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.
Supply Power Factor Improvement in Ozone Generator System Using Active Power ...IJPEDS-IAES
Artificial Ozone Generating system needs High Voltage, High Frequency
supply. The Ozonator distorts the supply currents and henceforth affect the
supply power factor. This paper presents the performance comparison of
PWM inverter to Power Factor Corrected (PFC) converter with PWM
inverter based High-voltage High-frequency power supply for ozone
generator system. The conventional inverter has front end bridge rectifier
with smoothing capacitor. It draws non-sinusoidal current from ac mains; as
a result input supply has more harmonics and poor power factor. Hence,
there is a continuous need for power factor improvement and reduction of
line current harmonics. The proposed system has active power factor
correction converter which is used to achieve sinusoidal current and improve
the supply power factor. The active PFC converter with PWM inverter fed
ozone generator generates more ozone output compared to the conventional
inverter. Thus the proposed system has less current harmonics and better
input power factor compared to the conventional system. The performance of
the both inverters are compared and analyzed with the help of simulation
results presented in this paper.
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
Analysis of direct power control AC-DC converter under unbalance voltage supp...IJECEIAES
This paper presents an analysis of Direct Power Control (DPC) technique for the Three-Phase Pulse Width Modulation (PWM) AC-DC converter under unbalanced supply condition. Unbalance condition will cause the presence of unbalanced current and voltages thus produce the negative components on the grid voltage as well as severe performance degradation of a grid connected Voltage Source Inverter (VSI). The input structures for conventional DPC has been modified with a three simpler sequence networks instead of coupled by a detailed Three-Phase system method. The imbalance voltage can be resolved by separating from the individual elements of voltage and current into symmetrical components called Sequence Network. Consequently, the input power relatively improved during unbalanced condition almost 70% through the measurement of Total Harmonic Distortion (THD) from the conventional Direct Power Control (DPC) in individual elements which is higher compared to separate components. Hence, several analyses are performed in order to analyze the steady state and dynamic performance of the converter, particularly during the load and DC voltage output reference variations.
The proposed model automatically corrects the power factor without any human presence. It consist of a micro controller which detects the power factor value,if the power factor goes low during peak hours it automatically connects capacitor banks to improve it. The main aim of the model is to maintain the power factor as high as possible which helps to increase the efficiency of the system.
Design of Transformer less Single Phase Inverterijtsrd
Solar energy is the top of all renewable energy systems because of its pollution free, adaptable, long life, low maintenance cost and favoured options for sustainable development. Thus, this is used as the source of input for this model. The PV cell converts the solar energy into electrical energy. This energy is in DC form. This DC voltage is raised to the desired level with the help of boost converter dc dc converter .The boost converter is driven with the help of MOSFET. The boosted DC voltage is fed to the PWM inverter which converts the dc input into ac output. And finally, the output is given to the load. The proposed inverter system converts DC power into single phase AC power efficiently without using transformers and batteries. In this, the simulation results of a transformer less single phase inverter which uses a photovoltaic array as the input are shown. An inverter with DC link is designed for conversion of DC input into AC supply. The simulation is carried out with the help of MATLAB simulation software. The harmonic distortion is found to be 2.73 in the FFT analysis. Stebana Rose Mary. G | Swathy. V | Nisha. K | Anandhi. M "Design of Transformer less Single-Phase Inverter" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-6 , October 2021, URL: https://www.ijtsrd.com/papers/ijtsrd47549.pdf Paper URL : https://www.ijtsrd.com/engineering/electrical-engineering/47549/design-of-transformer-less-singlephase-inverter/stebana-rose-mary-g
Hysteresis SVM for Coupled Inductor Z Source Diode Clamped 3-Level Inverter B...IAES-IJPEDS
Due to its advantages such as it can defeat problems such as leakage current
and insertion of DC in the grid and provides low stress on power devices,
Diode-clamped three-level inverter (DCTLI) is habitually used in
transformerless photovoltaic (PV) connected to grid network. But it still has
a problem of shoot-through which dwells in its legs, so its operation not
reliable. Z source network is employed to permit operation without shoot
through risk and improve its reliability. Coupled inductors are replaced the
line transformers in to attain lower cost, reduced size, and improved its
reliability and efficiency. Coupled inductor which avoids leakage current
problem and losses. It employs coupled inductor z source diode clamped
three level inverter (CI-Z-DC-TLI) to boost the voltage and further progress
the consistency of the proposed system by avoiding the shoot through the
problem. The proposed system assures that common-mode voltage
and shoot-through risk is avoided. Moreover, controlling DC-TLI with
Hysteresis SVM algorithm which improves output voltage and current
control. Simulation and experimental results of this proposed system were
analyzed using MATLAB environment and FPGA hardware.
Power Quality Improvement of Grid Interconnection of renewable Energy Based D...IJERA Editor
This paper presents a grid interfacing inverter which compensates power quality problems and also interface Renewable Energy Sources with the help of electric grid. Renewable Energy Sources are being increasingly connected in distribution system utilizing power electronic converters. Grid interfacing inverter can be used: 1) To improve the transfer of active power harvested from RES; 2) To meet load reactive power demand support ; 3) To reduce current harmonics by incorporating the current harmonic compensator at point of common coupling(PCC) ; 4) current unbalance and neutral current compensation in case of 3-phase 4-wire system. The fuzzy logic can be used in many applications especially, when the process/models are complex to analyse by using classical methods. Mainly fuzzy logic controller is used to control DC capacitor voltage. Simulations are carried out using MATLAB/SIMULINK to verify the performance of the controller. The output shows the controller has fast dynamic response high accuracy of tracking DC voltage reference and robust to load parameters variations.
Hardware Implementation of Single Phase Power Factor Correction System using ...IAES-IJPEDS
Rapid increase of consumers in electronics devices and the use of mains rectification circuits inside these electronic devices is the root cause of mains harmonic distortion. Automatic power factor correction techniques can be applied to the industries, power systems and households to make them stable inturns increases the efficiency of system as well as the apparatus. This paper deals with the hardware design of active power factor correction circuit employing boost converter which is used to boost the DC voltages with a controller based on PID control strategy. The pulses given to power switches by pulse width modulation techniques generated by utilizing micro-controller board, Arduino thus obviating the need of complex hardware circuitry. MATLAB/SIMULINK was used to design and tune the PID controller parameters. The simulation results are matching with the predictions and the same was implemented as hardware. The waveforms various test points and across capacitors were obtained, studied and compared with the theoretical waveforms and are found to be in precise proximity of theoretical waveforms.
Interleaved Boost Converter (ILBC) is a better converter between Photo Voltaic(PV) source and shunt active power filter. This paper deals with comparison of time domain outputs of PI and Fractional Order PID(FOPID) controlled ILBC fed shunt active filter in a grid connected PV system. The aim of this work is to minimize current ripple using ILBC between PV system and filter to improve the dynamic performance of shunt active filter. Closed loop monitored PI and FOPID systems are modeled, and the corresponding results are presented. MATLAB results of load voltage, current, converter voltage and currents with FOPID exhibits enhanced dynamic response. The proposed FOPID controlled ILBC Fed Shunt Active Filter system (ILBCFSAF) has advantages like low settling time, less peak over shoot and reduced steady state error in load voltage. The simulation results of ILBCSAF are compared with the corresponding hardware results.
Improvement of Power Quality using Fuzzy Logic Controller in Grid Connected P...IAES-IJPEDS
In this paper, the design of combined operation of UPQC and PV-ARRAY is designed. The proposed system is composed of series and shunt inverters connected back to back by a dc-link to which pv-array is connected. This system is able to compensate voltage and current related problems both in inter-connected mode and islanding mode by injecting active power to grid. The fundamental aspect is that the power electronic devices (PE) and sensitive equipments (SE) are normally designed to work in non-polluted power system, so they would suffer from malfunctions when supply voltage is not pure sinusoidal. Thus this proposed operating strategy with flexible operation mode improves the power quality of the grid system combining photovoltaic array with a control of unified power quality conditioner. Pulse Width Modulation (PWM) is used in both three phase four leg inverters. A Proportional Integral (PI) and Fuzzy Logic Controllers are used for power quality improvement by reducing the distortions in the output power. The simulated results were compared among the two controller’s strategies With pi controller and fuzzy logic controller
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.
Recently, Re-boost seven-level inverter has been developed as an alternative between Photovoltaic system and single-phase load. DC level is increased using a re-boost regulator and its output is rehabilitated into single-phase AC utilizing a seven-level inverter. The re-boost converter is utilized to escalate the voltage gain. The objective of the suggested closed loop Re-boost Seven Level Inverter fed Induction Motor (RBSLIIM) system is to enhance the dynamic response of RBSLIIM using FO-P-I-D controller. Simulink models are developed for P-I and FO-P-I-D controlled RBSLIIM systems. The results of P-I and FO-P-I-D based RBSLIIM systems indicate that the voltage response with FO-P-I-D is superior to P-I controlled RBSLIIM system.
Grid Connected PV System with Power Quality Improvement Using Intelligent Con...IJMTST Journal
The depletion of the fossil fuel resources and the global warming effects has led the world to think
seriously of other alternative sources of energy. So renewable energy resources (RES) are being connected to
the distribution systems, mostly done by using power electronic converters. But use of power electronic
converters and non-linear loads like at distribution level injects harmonics, which intern cause power quality
problems. Distribution static compensator (DSTATCOM) is very popular in compensating power problems for
nonlinear and unbalanced loads. Any change in the load affects the DC-link voltage (DCLV) directly.
Conventionally, a PI controller is used to maintain the DCLV to the reference value, but its transient response
is poor. So, fuzzy logic controller is proposed which shows better dynamic response. To trigger inverter HCC
is used. The proposed inverter with the control when connected to wind energy, helps the 3-phase 4-wire
linear/non-linear unbalanced load at point of common coupling appear as balanced linear load to the grid.
With MATLAB/Simulink simulation studies, the proposed control technique is demonstrated and evaluated
here.
SIMULATION OF REDUCED SWITCH INVERTER BASED UPQC WITH FUZZY LOGIC AND ANN CON...MABUSUBANI SHAIK
ABSTRACT
This paper presents a new methodology to reduce harmonic distortion in UPQC using artificial neural network
and fuzzy logic controller. So this paper main aim is improve power quality by using UPQC with ANN and FLC. The most purpose of the proposed (ANN & FLC) is capable of providing good static and dynamic performances compared to PI controller. The UPQC is to control on voltage flicker/unbalance, reactive power and harmonics. In different words, the UPQC has the potential of up power quality at the purpose of installation on power industrial power systems. The appliance of computing is growing quick within the space of power electronics and drives. From olden days to now days we are using twelve switches used in back to back configuration. But now we are using nine switches instead of 12
switches. In 9 switch UPQC converter given the most useful benefits compared to 12 switches power converter. The nine switches UPQC converter gets the best results by using of three methods. They are one is PI controller technique, ANN controller technique and FLC controller technique. By contrast PI, FLC and ANN, ANN is better than (FLC & PI) for power quality enhancement and voltage sag and voltage swell mitigations. The factitious neural network (ANN) is taken into account as a replacement tool to style management electronic equipment for power quality (PQ) devices. A whole
simulation study is administrated to analysis the performance of the ANN controller and compares its performance with the quality FLC & PI controller’s results. The nine-switch convertor has already been proved to possess sure benefits,
additionally to its part saving topological feature. Despite these benefits, the nine-switch convertor has thus far found restricted applications because of its several perceived performance tradeoffs like requiring associate degree outsized
dc-link capacitance, restricted amplitude sharing, and unnatural part shift between its 2 sets of output terminals. Rather than acceptive these tradeoffs as limitations, a nine-switch power conditioner is projected here that nearly “converts” most of those topological short comings into fascinating performance benefits. Aiming more to cut back its switch losses,
Harmonics, Voltage Sag & Swell associate degree acceptable discontinuous modulation theme is projected and studied here thoroughly to doubly make sure that top reduction of commutations is achieved. With associate degree suitably
designed management theme with PI and ANN with Fuzzy logic controller then incorporated, the nine-switch convertor is shown to favorably raise the general power quality in Simulation, thus justifying its role as an influence conditioner at a reduced value.
KEYWORDS: ANN, Active Power Filters, PI Controller, Nine Switch Converter, Power Quality, UPQC
Analysis of fuzzy logic controller based bi-directional DC-DC converter for b...IJECEIAES
This paper proposes a fuzzy logic-based battery energy management system in hybrid renewable system. The novel topology consists of solar and wind energy system-based input sources and a battery bank to store the energy when in excess. The PV-Wind source is equipped with unidirectional boost converter whereas, the battery storage system is connected to the system with a bi-directional DC/DC converter. The main novelty of this research is the fuzzy logic-based battery management system which charges and discharges into the DC bus system based on the supply-load demand. The fuzzy logic controller (FLC) based maximum power point tracking (MPPT) is used in the PV and wind energy conversion system (WECS) to track the maximum available power for the different irradiance and wind velocity respectively. The obtained results are compared to conventional P&O MPPT control algorithm to find the effectiveness of the system. A 500 W PV system and a 500 W Permanent magnet synchronous generator (PMSG) based WECS is implemented for its simplicity and high efficiency. The proposed control topology is designed and tested using MATLAB/ Simulink.
MODELING AND SIMULATION OF SOLAR PHOTOVOLTAIC APPLICATION BASED MULTILEVEL IN...ecij
As the solar market is blooming and forecasted to continue this trend in the coming years. The efficiency and reliability of PV based system has always been a contention among researchers. Therefore, multilevel inverters are gaining more assiduity as it has multitude of benefits. It offers high power capability along with low output harmonics. The main disadvantage of MLI is its complexity and requirement of large
number of power devices and passive components. This paper presents a topology that achieves 37.5% reduction in number of passive components and power devices for five-level inverter. This topology is basically based on H-bridge with bi-directional auxiliary switch. This paper includes a stand-alone PV
system in which designing and simulation of Boost converter connected with multilevel inverter for ac load is presented. Perturb and observe MPPT algorithm has been implemented to extract maximum power. The premier objective is to obtain Voltage with less harmonic distortion economically. Multicarrier Sinusoidal PWM techniques have been implemented and analysed for modulation scheme. The Proposed system is
simulated n MATLAB/Simulink platform.
MODELING AND SIMULATION OF SOLAR PHOTOVOLTAIC APPLICATION BASED MULTILEVEL IN...ecij
As the solar market is blooming and forecasted to continue this trend in the coming years. The efficiency and reliability of PV based system has always been a contention among researchers. Therefore, multilevel inverters are gaining more assiduity as it has multitude of benefits. It offers high power capability along with low output harmonics. The main disadvantage of MLI is its complexity and requirement of large
number of power devices and passive components. This paper presents a topology that achieves 37.5% reduction in number of passive components and power devices for five-level inverter. This topology is basically based on H-bridge with bi-directional auxiliary switch. This paper includes a stand-alone PV system in which designing and simulation of Boost converter connected with multilevel inverter for ac load is presented. Perturb and observe MPPT algorithm has been implemented to extract maximum power. The premier objective is to obtain Voltage with less harmonic distortion economically. Multicarrier Sinusoidal
PWM techniques have been implemented and analysed for modulation scheme. The Proposed system is simulated n MATLAB/Simulink platform.
Adaptive Fuzzy PI Current Control of Grid Interact PV Inverter IJECEIAES
Now a day‟s, Photo Voltaic (PV) power generation rapidly increasing. This power generation highly depending on the temperature and irradiation. When this power interface with grid through the voltage source inverter with PI controller. Its gains should be updated due to the parametric changes for the better performance. In This Work Fuzzy Controller updates the gains of the proportional integral (PI)s Controller under variable parametric conditions. the gaines of the PI Controller are updated based on the error current and change in error current through the fuzzy controller. The error current in direct and quadrature frame are the Inputs to the PI controller. The PI Controller generates the reference voltage to the pulse width modulation technique. Here reference voltage is compared with the carrier signal to generate the pulses to the 3-Ph Inverter connected to the grid. This controller has given well dynamic response with less steady state error and also given The less THD of the grid current compared to the PI and Fuzzy controller.It Is implemented and verified in MATLAB Simulink.
A Novel Technique for Enhancing Active and Reactive Power Quality for Renewab...IJMER
Renewable energy resources (RES) are being increasingly connected in distribution systems utilizing power electronic converters. This paper presents a novel control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as: 1) power converter to inject power generated from RES to the grid, and 2) shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. All of these functions may be accomplished either individually or simultaneously. With such a control, the combination of grid-interfacing inverter and the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appears as balanced linear load to the grid. This new control concept is demonstrated with extensive MATLAB/Simulink simulation studies and results.
This paper presents a grid-connected photovoltaic system (PV) used as a shunt active power filter (SAPF) to provide the power factor correction, harmonic elimination, reactive power compensation and to simultaneously supply power from a PV system to the utility. A direct power control (DPC) method is used for controlling the system to feed the photovoltaic energy in synchronization with grid and provide power quality improvement. The PI parameters of DC-link voltage controller are tuned using the Particle Swarm Optimization (PSO) algorithm without the need for an exact mathematical model of system. This PI-PSO controller gives better results for robustness, harmonic minimization and reduces the overshoot and undershoots of PI controller. The overall control of system is tested in Matlab/Simulink environment. Then, the simulations results demonstrate the robustness and feasibility of proposed method.
The aim of this research is the speed tracking of the permanent magnet synchronous motor (PMSM) using an intelligent Neural-Network based adapative backstepping control. First, the model of PMSM in the Park synchronous frame is derived. Then, the PMSM speed regulation is investigated using the classical method utilizing the field oriented control theory. Thereafter, a robust nonlinear controller employing an adaptive backstepping strategy is investigated in order to achieve a good performance tracking objective under motor parameters changing and external load torque application. In the final step, a neural network estimator is integrated with the adaptive controller to estimate the motor parameters values and the load disturbance value for enhancing the effectiveness of the adaptive backstepping controller. The robsutness of the presented control algorithm is demonstrated using simulation tests. The obtained results clearly demonstrate that the presented NN-adaptive control algorithm can provide good trackingperformances for the speed trackingin the presence of motor parameter variation and load application.
This paper presents a fast and accurate fault detection, classification and direction discrimination algorithm of transmission lines using one-dimensional convolutional neural networks (1D-CNNs) that have ingrained adaptive model to avoid the feature extraction difficulties and fault classification into one learning algorithm. A proposed algorithm is directly usable with raw data and this deletes the need of a discrete feature extraction method resulting in more effective protective system. The proposed approach based on the three-phase voltages and currents signals of one end at the relay location in the transmission line system are taken as input to the proposed 1D-CNN algorithm. A 132kV power transmission line is simulated by Matlab simulink to prepare the training and testing data for the proposed 1D- CNN algorithm. The testing accuracy of the proposed algorithm is compared with other two conventional methods which are neural network and fuzzy neural network. The results of test explain that the new proposed detection system is efficient and fast for classifying and direction discrimination of fault in transmission line with high accuracy as compared with other conventional methods under various conditions of faults.
Among the most widespread renewable energy sources is solar energy; Solar panels offer a green, clean, and environmentally friendly source of energy. In the presence of several advantages of the use of photovoltaic systems, the random operation of the photovoltaic generator presents a great challenge, in the presence of a critical load. Among the most used solutions to overcome this problem is the combination of solar panels with generators or with the public grid or both. In this paper, an energy management strategy is proposed with a safety aspect by using artificial neural networks (ANNs), in order to ensure a continuous supply of electricity to consumers with a maximum solicitation of renewable energy.
In this paper, the artificial neural network (ANN) has been utilized for rotating machinery faults detection and classification. First, experiments were performed to measure the lateral vibration signals of laboratory test rigs for rotor-disk-blade when the blades are defective. A rotor-disk-blade system with 6 regular blades and 5 blades with various defects was constructed. Second, the ANN was applied to classify the different x- and y-axis lateral vibrations due to different blade faults. The results based on training and testing with different data samples of the fault types indicate that the ANN is robust and can effectively identify and distinguish different blade faults caused by lateral vibrations in a rotor. As compared to the literature, the present paper presents a novel work of identifying and classifying various rotating blade faults commonly encountered in rotating machines using ANN. Experimental data of lateral vibrations of the rotor-disk-blade system in both x- and y-directions are used for the training and testing of the network.
This paper focuses on the artificial bee colony (ABC) algorithm, which is a nonlinear optimization problem. is proposed to find the optimal power flow (OPF). To solve this problem, we will apply the ABC algorithm to a power system incorporating wind power. The proposed approach is applied on a standard IEEE-30 system with wind farms located on different buses and with different penetration levels to show the impact of wind farms on the system in order to obtain the optimal settings of control variables of the OPF problem. Based on technical results obtained, the ABC algorithm is shown to achieve a lower cost and losses than the other methods applied, while incorporating wind power into the system, high performance would be gained.
The significance of the solar energy is to intensify the effectiveness of the Solar Panel with the use of a primordial solar tracking system. Here we propounded a solar positioning system with the use of the global positioning system (GPS) , artificial neural network (ANN) and image processing (IP) . The azimuth angle of the sun is evaluated using GPS which provide latitude, date, longitude and time. The image processing used to find sun image through which centroid of sun is calculated and finally by comparing the centroid of sun with GPS quadrate to achieve optimum tracking point. Weather conditions and situation observed through AI decision making with the help of IP algorithms. The presented advance adaptation is analyzed and established via experimental effects which might be made available on the memory of the cloud carrier for systematization. The proposed system improve power gain by 59.21% and 10.32% compare to stable system (SS) and two-axis solar following system (TASF) respectively. The reduced tracking error of IoT based Two-axis solar following system (IoT-TASF) reduces their azimuth angle error by 0.20 degree.
Kosovo has limited renewable energy resources and its power generation sector is based on fossil fuels. Such a situation emphasizes the importance of active research and efficient use of renewable energy potential. According to the analysis of meteorological data for Kosovo, it can be concluded that among the most attractive potential wind power sites are the locations known as Kitka (42° 29' 41" N and 21° 36' 45" E) and Koznica (42° 39′ 32″ N, 21° 22′30″E). The two terrains in which the analysis was carried out are mountain areas, with altitudes of 1142 m (Kitka) and 1230 m (Koznica). the same measuring height, about 84 m above the ground, is obtained for these average wind speeds: Kitka 6,667 m/s and Koznica 6,16 m/s. Since the difference in wind speed is quite large versus a difference in altitude that is not being very large, analyses are made regarding the terrain characteristics including the terrain relief features. In this paper it will be studied how much the roughness of the terrain influences the output energy. Also, that the assumption to be taken the same as to how much they will affect the annual energy produced.
Large-scale grid-tied photovoltaic (PV) station are increasing rapidly. However, this large penetration of PV system creates frequency fluctuation in the grid due to the intermittency of solar irradiance. Therefore, in this paper, a robust droop control mechanism of the battery energy storage system (BESS) is developed in order to damp the frequency fluctuation of the multi-machine grid system due to variable active power injected from the PV panel. The proposed droop control strategy incorporates frequency error signal and dead-band for effective minimization of frequency fluctuation. The BESS system is used to consume/inject an effective amount of active power based upon the frequency oscillation of the grid system. The simulation analysis is carried out using PSCAD/EMTDC software to prove the effectiveness of the proposed droop control-based BESS system. The simulation result implies that the proposed scheme can efficiently curtail the frequency oscillation.
This study investigates experimentally the performance of two-dimensional solar tracking systems with reflector using commercial silicon based photovoltaic module, with open and closed loop control systems. Different reflector materials were also investigated. The experiments were performed at the Hashemite University campus in Zarqa at a latitude of 32⁰, in February and March. Photovoltaic output power and performance were analyzed. It was found that the modified photovoltaic module with mirror reflector generated the highest value of power, while the temperature reached a maximum value of 53 ̊ C. The modified module suggested in this study produced 5% more PV power than the two-dimensional solar tracking systems without reflector and produced 12.5% more PV power than the fixed PV module with 26⁰ tilt angle.
This paper focuses on the modeling and control of a wind energy conversion chain using a permanent magnet synchronous machine. This system behaves a turbine, a generator, DC/DC and DC/AC power converters. These are connected on both sides to the DC bus, where the inverter is followed by a filter which is connected to the grid. In this paper, we have been used two types of controllers. For the stator side converter, we consider the Takagi-Sugeno approach where the parameters of controller have been computed by the theory of linear matrix inequalities. The stability synthesis has been checked using the Lyapunov theory. According to the grid side converter, the proportional integral controller is exploited to keep a constant voltage on the DC bus and control both types of powers. The simulation results demonstrate the robustness of the approach used.
The development of modeling wind speed plays a very important in helping to obtain the actual wind speed data for the benefit of the power plant planning in the future. The wind speed in this paper is obtained from a PCE-FWS 20 type measuring instrument with a duration of 30 minutes which is accumulated into monthly data for one year (2019). Despite the many wind speed modeling that has been done by researchers. Modeling wind speeds proposed in this study were obtained from the modified Rayleigh distribution. In this study, the Rayleigh scale factor (Cr) and modified Rayleigh scale factor (Cm) were calculated. The observed wind speed is compared with the predicted wind characteristics. The data fit test used correlation coefficient (R2), root means square error (RMSE), and mean absolute percentage error (MAPE). The results of the proposed modified Rayleigh model provide very good results for users.
This paper deals with an advanced design for a pump powered by solar energyto supply agricultural lands with water and also the maximum power point is used to extract the maximum value of the energy available inside the solar panels and comparing between techniques MPPT such as Incremental conductance, perturb & observe, fractional short current circuit, and fractional open voltage circuit to find the best technique among these. The solar system is designed with main parts: photovoltaic (PV) panel, direct current/direct current (DC/DC) converter, inverter, filter, and in addition, the battery is used to save energy in the event that there is an increased demand for energy and not to provide solar radiation, as well as saving energy in the case of generation more than demand. This work was done using the matrix laboratory (MATLAB) simulink program.
The objective of this paper is to provide an overview of the current state of renewable energy resources in Bangladesh, as well as to examine various forms of renewable energies in order to gain a comprehensive understanding of how to address Bangladesh's power crisis issues in a sustainable manner. Electricity is currently the most useful kind of energy in Bangladesh. It has a substantial influence on a country's socioeconomic standing and living standards. Maintaining a stable source of energy at a cost that is affordable to everyone has been a constant battle for decades. Bangladesh is blessed with a wealth of natural resources. Bangladesh has a huge opportunity to accelerate its economic development while increasing energy access, livelihoods, and health for millions of people in a sustainable way due to the renewable energy system.
When the irradiance distribution over the photovoltaic panels is uniform, the pursuit of the maximum power point is not reached, which has allowed several researchers to use traditional MPPT techniques to solve this problem Among these techniques a PSO algorithm is used to have the maximum global power point (GMPPT) under partial shading. On the other hand, this one is not reliable vis-à-vis the pursuit of the MPPT. Therefore, in this paper we have treated another technique based on a new modified PSO algorithm so that the power can reach its maximum point. The PSO algorithm is based on the heuristic method which guarantees not only the obtaining of MPPT but also the simplicity of control and less expensive of the system. The results are obtained using MATLAB show that the proposed modified PSO algorithm performs better than conventional PSO and is robust to different partial shading models.
A stable operation of wind turbines connected to the grid is an essential requirement to ensure the reliability and stability of the power system. To achieve such operational objective, installing static synchronous compensator static synchronous compensator (STATCOM) as a main compensation device guarantees the voltage stability enhancement of the wind farm connected to distribution network at different operating scenarios. STATCOM either supplies or absorbs reactive power in order to ensure the voltage profile within the standard-margins and to avoid turbine tripping, accordingly. This paper present new study that investigates the most suitable-location to install STATCOM in a distribution system connected wind farm to maintain the voltage-levels within the stability margins. For a large-scale squirrel cage induction generator squirrel-cage induction generator (SCIG-based) wind turbine system, the impact of STATCOM installation was tested in different places and voltage-levels in the distribution system. The proposed method effectiveness in enhancing the voltage profile and balancing the reactive power is validated, the results were repeated for different scenarios of expected contingencies. The voltage profile, power flow, and reactive power balance of the distribution system are observed using MATLAB/Simulink software.
The electrical and environmental parameters of polymer solar cells (PSC) provide important information on their performance. In the present article we study the influence of temperature on the voltage-current (I-V) characteristic at different temperatures from 10 °C to 90 °C, and important parameters like bandgap energy Eg, and the energy conversion efficiency η. The one-diode electrical model, normally used for semiconductor cells, has been tested and validated for the polemeral junction. The PSC used in our study are formed by the poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM). Our technique is based on the combination of two steps; the first use the Least Mean Squares (LMS) method while the second use the Newton-Raphson algorithm. The found results are compared to other recently published works, they show that the developed approach is very accurate. This precision is proved by the minimal values of statistical errors (RMSE) and the good agreement between both the experimental data and the I-V simulated curves. The obtained results show a clear and a monotonic dependence of the cell efficiency on the studied parameters.
The inverter is the principal part of the photovoltaic (PV) systems that assures the direct current/alternating current (DC/AC) conversion (PV array is connected directly to an inverter that converts the DC energy produced by the PV array into AC energy that is directly connected to the electric utility). In this paper, we present a simple method for detecting faults that occurred during the operation of the inverter. These types of faults or faults affect the efficiency and cost-effectiveness of the photovoltaic system, especially the inverter, which is the main component responsible for the conversion. Hence, we have shown first the faults obtained in the case of the short circuit. Second, the open circuit failure is studied. The results demonstrate the efficacy of the proposed method. Good monitoring and detection of faults in the inverter can increase the system's reliability and decrease the undesirable faults that appeared in the PV system. The system behavior is tested under variable parameters and conditions using MATLAB/Simulink.
The electrical distribution network is undergoing tremendous modifications with the introduction of distributed generation technologies which have led to an increase in fault current levels in the distribution network. Fault current limiters have been developed as a promising technology to limit fault current levels in power systems. Though, quite a number of fault current limiters have been developed; the most common are the superconducting fault current limiters, solid-state fault current limiters, and saturated core fault current limiters. These fault current limiters present potential fault current limiting solutions in power systems. Nevertheless, they encounter various challenges hindering their deployment and commercialization. This research aimed at designing a bridge-type nonsuperconducting fault current limiter with a novel topology for distribution network applications. The proposed bridge-type nonsuperconducting fault current limiter was designed and simulated using PSCAD/EMTDC. Simulation results showed the effectiveness of the proposed design in fault current limiting, voltage sag compensation during fault conditions, and its ability not to affect the load voltage and current during normal conditions as well as in suppressing the source powers during fault conditions. Simulation results also showed very minimal power loss by the fault current limiter during normal conditions.
This paper provides a new approach to reducing high-order harmonics in 400 Hz inverter using a three-level neutral-point clamped (NPC) converter. A voltage control loop using the harmonic compensation combined with NPC clamping diode control technology. The capacitor voltage imbalance also causes harmonics in the output voltage. For 400 Hz inverter, maintain a balanced voltage between the two input (direct current) (DC) capacitors is difficult because the pulse width modulation (PWM) modulation frequency ratio is low compared to the frequency of the output voltage. A method of determining the current flowing into the capacitor to control the voltage on the two balanced capacitors to ensure fast response reversal is also given in this paper. The combination of a high-harmonic resonator controller and a neutral-point voltage controller working together on the 400 Hz NPC inverter structure is given in this paper.
Direct current (DC) electronic load is a useful equipment for testing the electrical system. It can emulate various load at a high rating. The electronic load requires a power converter to operate and a linear regulator is a common option. Nonetheless, it is hard to control due to the temperature variation. This paper proposed a DC electronic load using the boost converter. The proposed electronic load operates in the continuous current mode and control using the integral controller. The electronic load using the boost converter is compared with the electronic load using the linear regulator. The results show that the boost converter able to operate as an electronic load with an error lower than 0.5% and response time lower than 13 ms.
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2. IJPEDS ISSN: 2088-8694
Distributed Generation Inverter as APF in Dual APF DG Interfacing Scheme (Yadiki Rajendra Babu)
1442
Load
Shunt Active
Power Filter
Source
Currents
Load
Currents
Compensation
Currents
Electrical
Power Grid
Figure 1. Schematic diagram of APF in power system
Non-linear loads are commonly present in industrial facilities, service facilities, office buildings,
and even in our homes. They are the source of several Power Quality problems such as harmonics, reactive
power, flicker and resonance [4-5]. Therefore, it can be observed an increasing deterioration of the electrical
power grid voltage and current waveforms, mainly due to the contamination of the system currents with
harmonics of various orders, including inter-harmonics [6]. Harmonic currents circulating through the line
impedance produces distortion in the system voltages. To compensate the harmonics, FACTS controllers are
developed. Shunt APF is a device developed to nullify the harmonic distortion in source components. The
Shunt Active Power Filter behaves as a controlled current-source draining the undesired components from
the load currents, such that the currents in the electrical power grid become sinusoidal, balanced, and in phase
with fundamental positive sequence component of the system voltages [7-11]. The schematic diagram of
APF in power system is shown in figure 1. In this context, dual APF is employed for harmonic suppression.
Dual APF is the concept of having two parallel APF’s for harmonic suppression in power system source
components.
Diode Bridge Rectifier
Source
R
L
Point of Common
Coupling
Source
Impedance
DG Inverter and as APF Active Power Filter
Distributed
Generation
Vdc
Figure 2. Schematic system with dual APF and DG integrating scheme
This paper presents the harmonic compensation using dual APF sharing compensating signals while
active power is fed from distributed generation to grid. Dual APF is the concept of having two parallel APF’s
for harmonic suppression in power system source components. DG inverter acts as an interface between DG
system and grid to feed active power from DG to grid. In this context, the DG inverter acts both as inverter
and APF, used as inverter to invert supply from DG and feeds grid for specified time and also as APF for
harmonic compensation thereafter along with dual APF. The proposed system is developed and results are
obtained using MATLAB/SIMULINK software. Results are shown for DG inverter feeding active power to
grid and also acting as APF. Dual APF characteristics are also shown. Dual APF is controlled using
instantaneous PQ theory and DG inverter is controlled using simple control strategy to feed 5KW power to
grid.
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2. PROPOSED DISTRIBUTION SYSTEM WITH DUAL APF AND DG INTEGRATING
SCHEME
Figure 2 shows the schematic system of power distribution system with dual APF and DG
integration scheme. Dual APF is meant for harmonic elimination and DG integrating inverter acts as an
interfacing inverter to invert the type of DG supply. In this context, for a prescribed time when the DG is
switched in to the power distribution system, DG inverter acts as an interfacing inverter to invert the type of
DG supply from DC to AC. After prescribed time, DG inverter acts as an APF for harmonic elimination
along with APF. DG inverter is controlled with simple control strategy to feed power of 5KW to grid. DG
inverter consists of solid-state switches in three legs for three-phase output. The output of DG inverter is
filtered out to give smooth sinusoidal output using filter circuit. Initially the DG is switched in to the power
system at the instant of 0.1 seconds. From 0.1 sec, the DG inverter just acts as an inverter converting DC type
from DG to AC type to feed power of 5KW to grid. At 0.2 seconds, the DG inverter is switched to act as APF
to feed compensating signals to point of common coupling.
Dual APF is the concept of having two parallel APF’s for harmonic elimination. Each individual
APF shares the compensating current load such that the stress and capacity of the individual APF reduces and
as a result losses get reduced. Each individual APF of dual APF consists of power switches with a small DC
source. The two parallel APF’s individually sends compensating signals to point of common coupling such
that harmonics in source components are reduced. Apart from DG inverter acting as APF, APF works
individually to reduce the harmonic distortion in source currents.
3. CONTROL OF DG INVERTER AND DUAL APF
3.1. Control of DG Inverter
Initially the DG is switched in to the power system at the instant of 0.1 seconds. From 0.1 sec, the
DG inverter just acts as an inverter converting DC type from DG to AC type to feed power of 5KW to grid.
At 0.2 seconds, the DG inverter is switched to act as APF to feed compensating signals to point of common
coupling.
Iq(ref)
Id(ref)
I0(ref)
Vs(abc)
PLL
0
10
0
θ
PWM
Generator
Iabc(ref)
Iabc(act)
Gate Pulses to DG
Inverter to act as
Inverter
dq-abc
Transformation
ωt
HCC
I*ref(abc)
Ig(abc)
Step Control
@ 0.2 Sec
Conditional Switch
Condition for
Passing Signal-1
u2 > Thresh hold
Gate Pulses to DG
Inverter to act as
APF
Figure 3. Control strategy for DG inverter
Control strategy for controlling DG inverter placed after DG to invert power from DC type to AC
type is shown in Figure 3. While DG inverter acting as inverter to invert the DG supply, source voltage is
sent to PLL to obtain the information regarding phase angle. In this simple control strategy to control DG
inverter, the reference values of Iq(ref), I0(ref) are set to zero as no reactive power is fed to grid. Only active
power is fed from DG to grid and thus Id(ref) is set to a fixed value. The reference values are fed to dq-abc
transformation (inverse Clarke’s transformation). The output of inverse transformation yields three-phase
reference current signals. The obtained reference current signals are then compared with actual current
signals. The error signal is fed to simple PWM generator to produce pulses to DG inverter to invert the Dg
supply type to AC.
4. IJPEDS ISSN: 2088-8694
Distributed Generation Inverter as APF in Dual APF DG Interfacing Scheme (Yadiki Rajendra Babu)
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3.1. Control of Dual APF
At 0.2 seconds, the DG inverter is switched to act as APF to feed compensating signals to point of
common coupling. Instantaneous active-reactive power theory is used to control dual APF. Instantaneous
active and reactive power is general theory to control a voltage source converter to produce gate pulses for
harmonic suppression at point of common coupling inducing compensating signals. This theory was
developed by Akagi in 1980’s. This theory is also called as instantaneous power theory or P-Q theory. The
schematic control flow of P-Q theory is shown in Figure 4.
Clarke’s Transformation
Filter for P for
calculation of Pc
*
Qc
*
Filter for Q for
calculation of
PI
Pc
*
Qc
*
Calculation of reference Current
in α-β terms
Inver’s Clarke’s Transformation
to Calculation of reference
Current in abc Transformation
HCC
Gate Pulses to
Dual APF Switches
Instantaneous
Power Calculation
Vdc(act)
Vdc(ref)
P
Source Voltage
(Vs)
Load Current
(IL)
Figure 4. Control algorithm of P-Q theory
Instantaneous active and reactive power theory involves the transformation of stationary a-b-c frame to
orthogonal stationary α-β frame by using Clarke’s transformation.
[ √ √
] [ ] (1)
[ √ √
] [ ] (2)
[ ] (3)
[√ √
] (4)
[ ] (5)
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[√ √
] (6)
Three-phase voltage signals in a-b-c frame is converted to α-β frame as indicated in Equation 1 and three-
phase current signals in a-b-c frame is converted to α-β frame as indicated in Equation (2). Voltages and
currents in α-β frame are sent for instantaneous power calculations. Active and reactive powers are calculated
from α-β frames of voltage and currents as in (7) and (8) represented as (9).
(7)
(8)
[ ] [ ] [ ] (9)
P and Q are the instantaneous active and reactive powers. The calculated instantaneous active power is
passed through a high pass filter to obtain AC component of active power ( ̃). Actual DC link voltage is
measured and compared with reference DC link voltage and the error is damped using a simple PI controller
to obtain power loss Ploss component ( ̅). The obtained power loss component is compared with AC
component of power to obtain reference compensating active power component as (10).
̃ ̅ (10)
The reference active power and reactive power components are sent for calculation of reference currents in α-
β frame with (11) and are converted to a-b-c coordinates using inverse Clarke’s transformation as in (12).
[ ] [ ] [ ] (11)
[ ]
[
√
√
]
[ ] (12)
where , and are the reference currents obtained from inverse Clarke’s transformation. The reference
current signals in three co-ordinate system are compared with actual currents and the error signal is sent to
hysteresis current controller which produces gate pulses to two parallel APF’s. The currents from two parallel
voltage source converters (APF’s) sends compensating signals to point of common coupling to reduce the
harmonic distortion in power distribution source components. The complete schematic arrangement of DG
integration to grid with two parallel inverters for harmonic suppression with their respective control strategies
were shown in Figure 5.
6. IJPEDS ISSN: 2088-8694
Distributed Generation Inverter as APF in Dual APF DG Interfacing Scheme (Yadiki Rajendra Babu)
1446
Diode Bridge Rectifier
Source
R
L
Point of Common
Coupling
Source
Impedance
DG Inverter and as APF
Active Power Filter
Distributed
Generation
Vdc
Gate Pulses to
DG Inverter
HPF
+
-
+
- +
-
Clarke’s
Transformation
Instantaneous Power
Calculation
Calculation of
Reference Currents
Inverse Clarke’s
Transformation
Iref(abc)
Iact(abc)
Vdc(act)
Vdc(ref)
PI
P
P
Pc*
Qc*
HCC
Gate Pulses to
APF-1 Switch
~
P
Iα, Iβ
Vα, Vβ
IL
Vs
Iq(ref)
Id(ref)
I0(ref)
Vs(abc)
PLL
0
10
0
θ
PWM
Generator
Iabc(ref)
Iabc(act)
Gate Pulses to DG
Inverter to act as
Inverter
dq-abc
Transformation
ωt
HCC
I*ref(abc)
Ig(abc)
Step Control
@ 0.2 Sec
Conditional Switch
Condition for
Passing Signal-1
U2 > Thresh hold
Gate Pulses to DG
Inverter to act as
APF
Figure 5. The complete schematic arrangement of DG integration to grid with two parallel inverters for
harmonic suppression with their respective control strategies
4. RESULTS AND ANALYSIS
Table 1. System Parameters
Parameter Value
Source Impedance (Zs) 0.1 + j0.28 Ω
Load Impedance 30 + j9.42 Ω
Source Voltage 415 V phase-phase
Fundamental Frequency 50 Hz
DC Link voltage 800 V
Filter inductance 22.5 mH
4.1. DG Inverter without Interchange, DG Inverter Acts as Inverter to Feed Active Power to Grid
Three-phase source voltage and source currents are shown in Figure 6 and Figure 7 respectively for
Distribution system. Source voltage is maintained with peak 360V and source current is at 20A peak initially
up to DG disconnection. When DG is connected at 0.1 sec, the main source current drops to 10A and DG
feeds required current to load. Load current of balanced 20A is shown in Figure 8 and as load is of non-linear
type, load current is distorted but balanced. Load current is maintained with constant peak even with source
current reduction indicating required load current is fed from DG. Three-phase compensating signals from
two parallel APF’s are shown in Figure 9. Figure 9 represents the compensating signals induced from APF.
Power factor angle between source voltage and current is represented in Figure 10. The phase angle
difference between source voltage and current is zero and thus power factor is maintained nearer unity.
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Figure 6. Three-phase source voltage Figure 7. Three-phase source current
Figure 8. Three-phase Load current Figure 9. APF Compensation current
Figure 10. Power factor angle between source voltage and current
Harmonic distortion in source current is shown in Figure 11 and distortion in load current is shown
in Figure 12. Harmonic distortion in load current is 27.97% and distortion in source current is maintained at
4.96% which is within nominal limit.
8. IJPEDS ISSN: 2088-8694
Distributed Generation Inverter as APF in Dual APF DG Interfacing Scheme (Yadiki Rajendra Babu)
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Figure 11. Source current THD Figure 12. Load current THD
Figure 13. DG generated voltage after filtering Figure 14. DG generated current after filtering
Figure 15. DG generated voltage before filtering
Output voltage of inverter of distributed generation after filtering is shown in Figure 13. Currents
fed to distribution system from DG are shown in Figure 14. DG current remains zero up to switching of DG
till 0.1 sec. DG current of 10A is fed to grid to feed the load after 0.1 sec as soon as DG was switched with
reduction of main source current in power distribution system. DG inverter output voltage in three phases
before filtering is shown in Figure 15.
Figure 16. Injected active power into the grid Figure 17. Injected Reactive power into the grid
9. ISSN: 2088-8694
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Active power fed from DG is shown in Figure 16 and reactive power from DG is shown in
Figure 17. DG is switched in to power distribution system at instant 0.1 seconds. The active power from DG
remains zero up to 0.1 sec and after switching of DG in to system; active power of 5KW is fed from DG to
grid. Reactive power from DG is zero indicating no reactive power feeding to grid or absorption from grid.
Figure 18. Power factor angle between injected voltage
and current
Figure 19. THD of injected current to grid
Power angle between induced voltage and current from DG after switched ON to grid is shown in
Figure 18. The phase angle is zero and hence power factor is maintained nearer unity while feeding power to
grid from DG. Harmonic distortion in DG injected current is 3.73% as shown in Figure 19 and is maintained
within nominal value of limit.
4.2. DG Inverter with Interchange, DG Inverter Acts as APF to Feed Compensating Signals
Three-phase source voltage and source currents are shown in Figure 20 and Figure 21 respectively
for distribution system after DG inverter is interchanged to act as APF. Source voltage is maintained with
peak 360V and source current is at 20A peak initially up to DG disconnection. When DG is connected at 0.1
sec, the main source current drops to 10A and DG feeds required current to load. At 0.2 sec, the DG invert is
interchanged to act as APF and thus the current signal after 0.2 sec rises agin to original waveform as like
instant before 0.1 sec since DG is disconnected and feeds no power to grid. Load current of balanced 20A is
shown in Figure 22 and as load is of non-linear type, load current is distorted but balanced. Load current is
maintained with constant peak even with source current reduction indicating required load current is fed
from DG.
Figure 20. Three-phase source voltage Figure 21. Three-phase source current
10. IJPEDS ISSN: 2088-8694
Distributed Generation Inverter as APF in Dual APF DG Interfacing Scheme (Yadiki Rajendra Babu)
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Figure 22. Three-phase load current
Figure 23. APF Compensation current
Figure 24. Power factor angle between source voltage and current
Three-phase compensating signals from parallel APF are shown in Figure 23. Figure 23 represents
the compensating signals induced from APF Power factor angle between source voltage and current is
represented in Figure 24. The phase angle difference between source voltage and current is zero and thus
power factor is maintained nearer unity. Harmonic distortion in source current is shown in Figure 25 and
distortion in load current is shown in Figure 26. Harmonic distortion in load current is 28.12% and distortion
in source current is maintained at 4.9 % which is close to nominal limit.
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Figure 25. Source current THD after interchange Figure 26. Load current THD
Figure 27. DG generated voltage after filtering
Figure 28. DG generated current after filtering
12. IJPEDS ISSN: 2088-8694
Distributed Generation Inverter as APF in Dual APF DG Interfacing Scheme (Yadiki Rajendra Babu)
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Figure 29. DG generated voltage before filtering
Output voltage of inverter of distributed generation after filtering is shown in Figure 27. Currents
fed to distribution system from DG are shown in Figure 28. DG current remains zero up to switching of DG
till 0.1 sec. DG current of 10A is fed to grid to feed the load after 0.1 sec as soon as DG was switched with
reduction of main source current in power distribution system. When DG is interchanged to act as APF at 0.2
sec, DG inverter sends compensating signals. DG inverter output voltage in three phases before filtering is
shown in Figure 29.
Figure 30. Injected active power into the grid
Figure 31. Injected Reactive power into the grid
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Active power fed from DG is shown in Figure 30 and reactive power from DG is shown in
Figure 31. DG is switched in to power distribution system at instant 0.1 seconds. The active power from DG
remains zero up to 0.1 sec and after switching of DG in to system; active power of 5KW is fed from DG to
grid. After 0.2 sec, DG inverter is interchanged to act as APF and thus no active power is fed to grid and thus
active power to grid from DG falls back to zero. Reactive power from DG is zero indicating no reactive
power feeding to grid or absorption from grid.
Figure 32. Power factor angle between injected voltage and current
Power angle between induced voltage and current from DG after switched ON to grid and after interchanging
to act as APF is shown in Figure 32.
5. CONCLUSION
This paper presents the scheme of harmonic elimination using dual APF and DG integration scheme
in power distribution system. DG integration scheme involves power converter to invert power of DC type
from DG to AC to feed power to grid. This paper presents the scheme of interchanging the power converter
in DG interfacing scheme to act as both inverter to convert the type of supply and APF to nullify harmonics.
Results are shown for power converter interchanging scheme. DG is switched to power system at 0.1 sec and
from 0.1 sec to 0.2 sec, converter in DG interfacing scheme acts as inverter to invert the type of supply. After
0.2 sec, the converter acts as APF and feeds compensating signals to point of common coupling to nullify
harmonics. Characteristics of DG interfacing scheme and dual APF are shown. While DG converter acting as
inverter feeding power to grid, the source current decreases indicating the amount of power consumed from
main source is reduced. Then after, when DG converter is interchanged to act as APF, the source current
again rises but DG converter feeds compensating currents to point of common coupling.harmonic distortion
in both the cases and power factor is shown.
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1454
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BIOGRAPHIES OF AUTHORS
Yadiki Rajendra Babu received B.E. in Electrical & Electronics engineering from Siddaganga
institute of technology, Tumkur, Bangalore university in 2000 and received M.Tech degree in
Electrical Power Systems from JNTU college of engineering Ananthapuram in 2008. Currently
pursuing his Ph.D from Rayalaseema University, Kurnool, his fields of interest includes
Distribution generation systems, Power system operation and control, power system
optimization.
Dr. C. Srinivasa Rao, received B.Tech. in electrical & electronics engineering from QIS College
of Engineering and Technology, Ongole affiliated to JNTU Hyderabad and received M.E degree
in power systems from Birla Institute of Technology, Mesra, Ranchi. Received Ph.D from
JNTUK, Kakinda. His fields of interest include Renewable Energy Sources, Power system
operation and control, Power system optimization and power system dynamics. He is working as
Principal in G.Pullaiah College of Engineering and technology, Kurnool, A.P, India.