ANALYSIS OF DISCRETE & SPACE VECTOR PWM CONTROLLED HYBRID ACTIVE FILTERS FOR POWER QUALITY ENHANCEMENT
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It is known from the fact that Harmonic Distortion is one of the main power quality problems frequently encountered by the utilities. The harmonic problems in the power supply are caused by the non-linear characteristic based loads. The presence of harmonics leads to transformer heating, electromagnetic interference and solid state device mal-functioning. Hence keeping in view of the above concern, research has been carried out to mitigate harmonics. This paper presents an analysis and control methods for hybrid active power filter using Discrete Pulse Width Modulation and Space Vector Pulse Width Modulation (SVPWM) for Power Conditioning in distribution systems. The Discrete PWM has the function of voltage stability, and harmonic suppression. The reference current can be calculated by ‘d-q’ transformation. In SVPWM technique, the Active Power Filter (APF) reference voltage vector is generated instead of the reference current, and the desired APF output voltage is generated by SVPWM. The THD will be decreased significantly by SVPWM technique than the Discrete PWM technique based Hybrid filters. Simulations are carried out for the two approaches by using MATLAB, it is observed that the %THD has been improved from 1.79 to 1.61 by the SVPWM technique.
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Novel High Performance Stand Alone Solar PV System with High Gain, High Effic...
This document describes a novel standalone solar PV system that uses high gain, high efficiency DC-DC converters in both the power stage and battery interface. This allows the use of low voltage PV and battery sources while minimizing issues from partial shading. It also prevents overcharging and deep discharging of battery modules. The system facilitates "required power tracking" from the PV source to match load requirements without needing dump loads. Simulation and experimental results show the system achieves high performance and efficiency of 94%. The document concludes by noting limitations and opportunities for further improvement.
A novel online fuzzy control method of static var compensation for an effecti...
The Flexible AC Transmission System (FACTS) technology is a promising technology to achieve complete deregulation of Power System i.e. Generation, Transmission and Distribution as the complete individual units. FACTS is based on power electronic devices, used to enhance the existing transmission capabilities in order to make the transmission system flexible and independent in operation. The loading capability of transmission system can also be enhanced nearer to its thermal limit without affecting the stability. Complete closed-loop smooth control of reactive power can be achieved using shunt connected FACTS devices. Static VAR Compensator (SVC) is one of the shunt connected FACTS devices, which can be utilized for the purpose of reactive power compensation. As the Intelligent FACTS devices make them adaptable, it is emerging as the present state of the art technology. This paper presents the design and simulation of the Fuzzy logic control to vary firing angle of SVC in order to achieve better, smooth and adaptive control of reactive power in transmission systems. The design, modeling and simulations are carried out for the λ/8 Transmission line by placing the compensation at the receiving end (load end) and the results obtained demonstrates the effectiveness of the proposed method.
New control strategy for three phase grid-connected lcl inverters without a p...
The three-phase synchronous reference frame phase-locked loop (SRF-PLL) is widely used for synchronization applications in power systems. In this paper, a new control strategy for three-phase grid-connected LCL inverters without a PLL is presented. According to the new strategy, a current reference can be generated by using the instantaneous power control scheme and the proposed positive-sequence voltage detector. Through theoretical analysis, it is indicated that a high-quality grid current can be produced by introducing the new control strategy. In addition, a kind of independent control for reactive power can be achieved under unbalanced and distorted grid conditions. Finally, the excellent performance of the proposed control strategy is validated by means of simulation and experimental results.
A three phase grid tied spv system with adaptive dc link voltage for cpi volt...
This paper deals with a three-phase two-stage grid tied SPV (solar photo-voltaic) system. The first stage is a boost converter, which serves the purpose of MPPT (maximum power point tracking) and feeding the extracted solar energy to the DC link of the PV inverter, whereas the second stage is a two-level VSC (voltage source converter) serving as PV inverter which feeds power from a boost converter into the grid. The proposed system uses an adaptive DC link voltage which is made adaptive by adjusting reference DC link voltage according to CPI (common point of interconnection) voltage. The adaptive DC link voltage control helps in the reduction of switching power losses. A feed forward term for solar contribution is used to improve the dynamic response. The system is tested considering realistic grid voltage variations for under voltage and over voltage. The performance improvement is verified experimentally. The proposed system is advantageous not only in cases of frequent and sustained under voltage (as in the cases of far radial ends of Indian grid) but also in case of normal voltages at CPI. The THD (total harmonics distortion) of grid current has been found well under the limit of an IEEE-519 standard.
Asymmetric control of dc link voltages for separate mppt’s in three-level inv...
The document proposes a new control method for a three-level inverter that allows the DC-link voltages to be regulated asymmetrically. This would allow photovoltaic modules to be split into two groups, with each group connected to a separate DC-link capacitor, enabling separate maximum power point tracking for each group. The method was tested experimentally using a T-type three-level inverter with each DC-link capacitor supplied by a PV simulator emulating two PV modules under different shading conditions.
Asymmetric control of dc link voltages for separate mppt’s in three-level inv...
The document proposes a new control method for a three-level inverter that allows the DC-link voltages to be regulated asymmetrically. This would allow photovoltaic modules to be split into two groups, with each group connected to a separate DC-link capacitor, enabling separate maximum power point tracking for each group. The method was examined experimentally using a T-type three-level inverter with each DC-link capacitor supplied by a PV simulator emulating two PV modules under different shading conditions.
Multifunctional grid tied pv system using modified klms control
This paper deals with the modified kernel least mean square (KLMS) control strategy in double-stage, solar photovoltaic (PV) grid tied system to enhance the power quality at common coupling point (CCP). This proposed control algorithm has less oscillations, fast convergence, fast dynamic response and good steady state performance. A control strategy is used to extract the fundamental active current component of load and generates reference grid current for a DC-AC converter. The proposed modified KLMS control mitigates multiple power quality concerns such as harmonics reduction, unity power factor and load balancing. The dynamic performance of proposed system is confirmed into the MATLAB\Simulink environment. Test results on hardware implementation are presented at varying solar irradiation levels and load unbalancing. Test results are found satisfactory and total harmonic distortion (THD) of the grid currents are observed well within the IEEE-519 standard.
Power Quality Improvement in Solar Fed Cascaded Multilevel Inverter with Outp...
This document discusses a project to improve power quality in a solar photovoltaic energy conversion system using a cascaded 15-level inverter. Proportional Integral, Artificial Neural Network, and Fuzzy Logic controllers are investigated to eliminate harmonics. Simulations were performed in MATLAB/Simulink and hardware was demonstrated for a 3kWp photovoltaic plant coupled to a multilevel inverter. The fuzzy logic controller provided the best results for voltage regulation and power quality improvement. Experimental results validated the effectiveness of the proposed system for grid interaction while improving power quality.
Control and energy management of a large scale grid connected pv system
Power quality is highlighted as an important parameter in modern power systems. Moreover, grid-connected photovoltaic power plants are increasing significantly in size and capacity. Elsewhere, due to the progressive integration of nonlinear loads in the grid, the principal role of a Solar Energy Conversion System (SECS) is not only to capture the maximum power from solar but, also to ensure some ancillary services and improve the quality of power. This paper presents a novel strategy dedicated to improve the management of active power generation, reactive power compensation and power quality of a SECS, while guaranteeing the possibility of exploiting the full capacity of the Power Conditioning System (PCS) and the PhotoVoltaic System (PVS). The proposed control algorithm is applied to a large scale PVS connected to the grid through a cascade of a DC-DC converter and a PWM inverter. This control strategy manages the SECS function’s priorities, between main active power generation, reactive power compensation and active filtering in such a way to guarantee a smooth and stable DC voltage and ensure a sinusoidal grid current. Top priority is given to the active power production over power quality improvement. Then, priority is given to reactive power compensation over mitigation of current harmonics absorbed by the non-linear load connected to the Point of Common Coupling (PCC). Moreover, the whole system upper limits of active and reactive powers have been determined in the (PQ) power plane on the basis of PVS available power, converters rated power and DC bus voltage smoothness and stability. Finally, a control procedure dedicated to the calculation of the inverter current commands is proposed in order to exploit the full capacity of the SECS and respect the determined power limits. Simulation results confirm the effectiveness and the performance of this control strategy and prove that the SECS can operate at its full power whilst the power quality can be improved by reactive power compensation and active filtering.
Control and energy management of a large scale grid-connected PV system for p...
Power quality is highlighted as an important parameter in modern power systems. Moreover, grid-connected photovoltaic power plants are increasing significantly in size and capacity. Elsewhere, due to the progressive integration of nonlinear loads in the grid, the principal role of a Solar Energy Conversion System (SECS) is not only to capture the maximum power from solar but, also to ensure some ancillary services and improve the quality of power. This paper presents a novel strategy dedicated to improve the management of active power generation, reactive power compensation and power quality of a SECS, while guaranteeing the possibility of exploiting the full capacity of the Power Conditioning System (PCS) and the PhotoVoltaic System (PVS). The proposed control algorithm is applied to a large scale PVS connected to the grid through a cascade of a DC-DC converter and a PWM inverter. This control strategy manages the SECS function’s priorities, between main active power generation, reactive power compensation and active filtering in such a way to guarantee a smooth and stable DC voltage and ensure a sinusoidal grid current. Top priority is given to the active power production over power quality improvement. Then, priority is given to reactive power compensation over mitigation of current harmonics absorbed by the non-linear load connected to the Point of Common Coupling (PCC). Moreover, the whole system upper limits of active and reactive powers have been determined in the (PQ) power plane on the basis of PVS available power, converters rated power and DC bus voltage smoothness and stability. Finally, a control procedure dedicated to the calculation of the inverter current commands is proposed in order to exploit the full capacity of the SECS and respect the determined power limits. Simulation results confirm the effectiveness and the performance of this control strategy and prove that the SECS can operate at its full power whilst the power quality can be improved by reactive power compensation and active filtering.
2.[6 13]investigation on d-statcom operation for power quality improvement in...
1) The document presents a new control scheme for D-STATCOM that uses sinusoidal PWM signals based only on voltage measurements to regulate voltage in distribution systems.
2) Simulations using MATLAB/PLECS show the control scheme maintains constant voltage under disturbances by exchanging reactive power with the system through the D-STATCOM.
3) Results demonstrate the control scheme effectively regulates voltage, compensates for harmonics, and corrects power factor during system faults and load variations.
Power Quality Improvement of Grid-Connected Photovoltaic Systems Using Trans-...
Voltage-source inverter has been used widely in traditional photovoltaic systems which have limitations. To overcome, Z-source inverter has been introduced. In spite of all the features introduced in Z-source inverter, its configuration has been improved over the years, like trans-Z-source inverter which has added advantages compared to traditional inverters, namely buck–boost feature, lesser passive elements, and higher voltage boost gain. In this paper, photovoltaic arrays are connected to the grid via the trans-Z-source inverter with the aim of improving its power quality. Moreover, the shoot through duty ratio is kept constant in the switching control method to add features like lower voltage stress (higher reliability), lower total harmonic distortion (lower maintenance cost), and higher voltage boost ratio. To evaluate the precision of the proposed system, the photovoltaic system is simulated on a standard grid and under partial shading condition which brings about voltage sag, and hence, a dynamic voltage restorer is used to mitigate voltage sag. Simulation results are presented to verify the validation of the proposed photovoltaic system in terms of voltage and current THD reducing 78.2% and 19.7%, respectively.
A Highly Efficient and Reliable Inverter Configuration Based Cascaded Multi-L...
This document presents a proposed improved cascaded multi-level inverter configuration for photovoltaic systems that aims to minimize leakage current. The proposed topology reduces switch count and has lower switching and conduction losses compared to existing designs. It also aims to reduce high-frequency voltage transitions in the terminal and common-mode voltages to minimize leakage current and reduce the size of EMI filters. Simulation results validating the performance of the proposed five-level inverter configuration are presented along with an analysis and comparison with other topologies.
An integrated boost resonant converter for photovoltaic applications
Effective photovoltaic power conditioning requires efficient power conversion and accurate maximum power point tracking to counteract the effects of panel mismatch, shading, and general variance in power output during a daily cycle. In this paper, the authors propose an integrated boost resonant converter with low component count, galvanic isolation, simple control, as well as
high efficiency across a wide input and load range. Provided is a discussion of the converter synthesis, key operational features, converter design procedure, and loss analysis, as well as experimental verification by way of a 250-W prototype with a California Energy Commission efficiency of 96.8%.
Sensorless bldc motor commutation point detection and phase deviation correct...
This document discusses electrical projects using MATLAB/Simulink that focus on improving energy efficiency. It describes a project to replace a conventional induction motor with a brushless DC motor to power a 5000 m3/h commercial evaporative cooler. Experimental results showed the brushless motor improved efficiency by at least 75% compared to the induction motor, improving the energy rating from IE1 to IE5. It also proposes a constant power control method to maintain airflow in the face of pressure differences, and confirms this method was effective through testing. The document provides contact information for those interested in simulation results.
Reduced DC Link Voltage Active Power Filter Using Modified PUC5 Converter
In this paper the 5-level Packed U-Cell (PUC5) inverter is reconfigured with two identical DC links operating as an active power filter (APF). Generally, the peak voltage of an APF should be greater than the AC voltage at the point of common coupling (PCC) to ensure boost operation of the converter in order to inject harmonic current into the system effectively; therefore, full compensation can be obtained. The proposed modified PUC5 (MPUC5) converter has two equally regulated separated DC links, which can operate at no load condition useful for APF application. Those divided DC terminals amplitudes are added at the input of the MPUC5 converter to generate a boosted voltage that is higher than the PCC voltage. Consequently, the reduced DC links voltages are achieved since they do not individually need to be higher than the PCC voltage due to the mentioned fact that their summation has to be higher than PCC voltage. The voltage balancing unit is integrated into modulation technique to be decoupled from the APF controller. The proposed APF is practically tested to validate its good dynamic performance in harmonic elimination, AC side power factor correction, reactive power compensation and power quality improvement.
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Comparison of Modulation Techniques for Matrix Converter
Comparison of Modulation Techniques for Matrix Converter
Novel High Performance Stand Alone Solar PV System with High Gain, High Effic...
Novel High Performance Stand Alone Solar PV System with High Gain, High Effic...
A novel online fuzzy control method of static var compensation for an effecti...
A novel online fuzzy control method of static var compensation for an effecti...
New control strategy for three phase grid-connected lcl inverters without a p...
New control strategy for three phase grid-connected lcl inverters without a p...
A three phase grid tied spv system with adaptive dc link voltage for cpi volt...
A three phase grid tied spv system with adaptive dc link voltage for cpi volt...
Asymmetric control of dc link voltages for separate mppt’s in three-level inv...
Asymmetric control of dc link voltages for separate mppt’s in three-level inv...
Asymmetric control of dc link voltages for separate mppt’s in three-level inv...
Asymmetric control of dc link voltages for separate mppt’s in three-level inv...
Multifunctional grid tied pv system using modified klms control
Multifunctional grid tied pv system using modified klms control
Power Quality Improvement in Solar Fed Cascaded Multilevel Inverter with Outp...
Power Quality Improvement in Solar Fed Cascaded Multilevel Inverter with Outp...
Control and energy management of a large scale grid connected pv system
Control and energy management of a large scale grid connected pv system
Control and energy management of a large scale grid-connected PV system for p...
Control and energy management of a large scale grid-connected PV system for p...
2.[6 13]investigation on d-statcom operation for power quality improvement in...
2.[6 13]investigation on d-statcom operation for power quality improvement in...
Power Quality Improvement of Grid-Connected Photovoltaic Systems Using Trans-...
Power Quality Improvement of Grid-Connected Photovoltaic Systems Using Trans-...
A Highly Efficient and Reliable Inverter Configuration Based Cascaded Multi-L...
A Highly Efficient and Reliable Inverter Configuration Based Cascaded Multi-L...
An integrated boost resonant converter for photovoltaic applications
An integrated boost resonant converter for photovoltaic applications
Sensorless bldc motor commutation point detection and phase deviation correct...
Sensorless bldc motor commutation point detection and phase deviation correct...
Reduced DC Link Voltage Active Power Filter Using Modified PUC5 Converter
Reduced DC Link Voltage Active Power Filter Using Modified PUC5 Converter
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PV/Diesel Hybrid System for Fuel Production from Waste Plastics Recycling
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Expo unitedking
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This paper presents a standalone hybrid power system using wind/PV/diesel/Battery energy system with Matlab/Simulink environment. PV & Wind are the primary power sources of the system and battery is used as a backup for long run application. Here we have also compare the performance of PV/Wind/Battery connected system with PV/Wind/Diesel connected hybrid power system. The most frequently used renewable energy sources are those consisting of PV module and/or wind Turbine with/or Diesel generator, and some energy storage or backup system.
Case study for CORAL BAY energy modelling for a WIND DIESEL and stabilization...
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WIND-SOLAR-FUEL CELL HYBRID SYSTEM
This document describes a hybrid energy system that combines solar, wind, and fuel cell technologies. The system aims to provide reliable power for a 1kW load. It uses 6 photovoltaic panels that generate 1.5kW of power during the day. A vertical axis wind turbine produces 1.2kWp of power. A proton exchange membrane fuel cell stacks adds 1kW of power. The hybrid system mitigates the intermittency of solar and wind energy by allowing excess power generated to charge the fuel cell for use when renewable sources are unavailable. The document outlines the component selection and system design, and discusses innovations that could improve the efficiency and viability of such hybrid energy systems in the future.
Design & Construction of Wind-Solar Hybrid Power Generation System
Design & Construction of Wind-Solar Hybrid Power Generation SystemDhaka University of Engineering and Technology
This document summarizes a student project on a wind-solar hybrid power generation system. It introduces hybrid systems that combine renewable energy sources like solar and wind. The objectives are to study, design, and demonstrate a wind-solar hybrid power system to power LED lights. It describes the methodology, components, advantages and applications of the hybrid system. The system uses solar panels and a wind turbine to generate DC power, which is stored in batteries and converted to AC power using an inverter to run the LED lights. The conclusions are that the hybrid system provides stable power and can be commercially applied in rural areas.Hybrid solar wind power generation system
This document discusses a hybrid solar-wind power generation system. It begins by introducing renewable energy sources as alternatives to conventional polluting energy sources. It then describes solar and wind energy individually, noting their advantages like being clean sources but also limitations like unpredictability. The main section discusses the hybrid system, which combines solar panels, wind turbines, batteries, and other components to generate continuous power by leveraging the strengths of both sources. It has higher efficiency than individual systems and provides backup power. The document concludes the hybrid system is better than either source alone and has promising future applications and prospects in India given its ideal conditions for both solar and wind energy.
Hybrid power generation by and solar –wind
With the development of industry and
agriculture, a great amount of energy such as coal, oil
and gas has been consumed in the world. Extensive
use of these fossil energies deteriorates a series of
problems like energy crisis, environmental pollution
and so on. Everybody knows that the fossil energy
reserves are finite, some day it will be exhausted.
It is possible that the world will face a
global energy crisis due to a decline in the
availability of cheap oil and recommendations to a
decreasing dependency on fossil fuel. This has led to
increasing interest in alternate power/fuel research
such as fuel cell technology, hydrogen fuel, biodiesel,
Karrick process, solar energy, geothermal energy,
tidal energy and wind. Today, solar energy and wind
energy have significantly alternated fossil fuel with
big ecological problems.
With the development of the science and
technology, power generation using solar energy and
wind power is gradually known by more and more
people. And it is widespread used in many developed
countries. The merits of the solar and wind power
generation are very obvious-infinite and nonpolluting.
The raw materials of the solar and wind
power generation derived from nature, and wind
power generation can work twenty-four hours a day,
solar power generation only works by daylight. In
addition, this kind of power generation has no
exhaust emission and there is no influence to the
nature. But it also has some shortcomings. Because
of the imperfect of the technology, equipment of the
solar and wind power generation is very expensive.
By far, it cannot be widely used.
In addition, solar and wind power
generation system affected by the changing of the
weather very much, so it has obvious defects in
reliability compared with fossil fuel, and it is difficult
to make it fit for practical use the lack of economical
efficiency .Because of these problems it needs to
increase the reliability of energy supply by
developing a system which interacts Solar and wind
energy. This kind of system is usually called windsolar
hybrid power generation system significantly
A Hybrid Wind and Solar Energy System with Battery Energy Storage for an Isol...
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This document presents on a hybrid wind and solar energy system with battery energy storage for an isolated system. It discusses that in districts where solar and wind energy are naturally complementary, a hybrid system can reduce battery capacity and costs compared to standalone PV or wind. The system will use linear short-term prediction of wind and solar in its control strategy to optimize the system economically in MATLAB Simulink. A typical hybrid system consists of solar, wind, batteries, and a controller to regulate charging and protect from overcharging or deep discharging. Hybrid systems can have benefits like improved reliability, efficiency, fuel flexibility, lower emissions, and economics.Hybrid Solar-Wind Power System
This document discusses hybrid wind-solar power systems. It begins by introducing solar and wind energy individually, including their advantages such as being renewable and clean sources of energy, as well as some disadvantages like unpredictability and high upfront costs. It then describes a hybrid system that combines both solar panels and wind turbines to generate electricity, along with other components like batteries, controllers, and inverters. The document presents a case study of a hybrid system installed in India and finds it generated over 6,000 kWh annually with only 6.66% variation from predictions. In conclusion, hybrid systems are found to perform better than individual wind or solar systems due to their complementary nature.
Microgrid Presentation
Its a great presentation on Microgrid covering various aspects of Microgrid.
Guys who worked on this presentation:
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Harmonic Mitigation by SRF Theory Based Active Power Filter using Adaptive Hy...
Power quality is an all-encompassing concept for a multitude of individual types of power system disturbances. The presence of harmonics in power supply network poses a severe power quality problem that results in greater power losses in the distribution system, interference problems in communication systems and, sometimes, in operation failures of electronic equipment. Shunt active power filters are employed to suppress the current harmonics and reduce the total harmonic distortion (THD). The voltage source inverter (VSI) is the core of an active power filter. The hysteresis current control is a method of controlling the VSI. Hysteresis control can be either of fixed band type or adaptive band type. In this paper, Synchronous Reference Frame (SRF) theory is implemented for the generation of reference current signals for the controller. This paper investigates the effectiveness of the proposed model in harmonics currents mitigation by simulating a model of a three-phase three wire shunt active power filter based on adaptive hysteresis current control and SRF theory. Simulation results indicate that the proposed active power filter can restrain harmonics of electrical source current effectively
A New Circuit of Modular Multilevel Inverter for Grid-Connected Photovoltaic ...
This study presents a new circuit topology of the Modular Multilevel Converter (MMC) which is deployed for photovoltaic grid applications. In the conventional MMC, two arm inductors are placed in each phase to limit the circulating current. In the proposed topology, the inductors are replaced by a transformer. The proposed circuit gives a 50% reduction of the voltage rating of the power devices and the capacitors in comparison with the conventional MMC. The required dc-link voltage which is fed directly by PV panels is also reduced by half. The paper presents a PWM method to control the solar inverter output voltage. The proposed concept is confirmed through simulation and experimental results.
Simulation of distributed power flow controller for voltage sag compensation
In this paper, we introduced a new series-shunt type FACTS controller called as distributed power flow controller to improve and maintain the power quality of an electrical power system. This DPFC method is same as the UPFC used to compensate the voltage sag and the current swell these are voltage based power quality problems. As compared to UPFC the common dc link capacitor is removed and three individual single phase converters are used instead of a three phase series converter. Series referral voltages, branch currents are used in this paper for designing control circuit. The evaluated values are obtained by using MATLAB/SIMULINK.
Performance Enhancement of Shunt Active Power filter using a Kalman Filter ba...
This paper proposes a Kalman filter (KF) based H∞ control scheme for a three phase shunt active power filter (SAPF) system. For the current control loop, a H∞ controller is designed with a mixed sensitivity approach for achieving stability and high disturbance rejection in the SAPF system. A new current reference scheme is also proposed that employs KF to avoid synchronization circuit and proportional integral (PI) controller loop resulting in a reliable and cost-effective SAPF system. This reference scheme can self-regulate the dc-link voltage by a fast and adaptive estimation of the source reference current with power system perturbations raised in source or load sides. The efficacy of the proposed KF-H∞ control algorithm is evaluated through comparison with an existing PI and PI plus vector PI (PI-PIVPI) algorithm and then validated with experimental studies pursued using a dSPACE1104. From the obtained experimental results, it is observed that the proposed SAPF significantly outperforms the existing PI-PIVPI in terms of exhibiting robustness to modeling uncertainties and insensitivity to grid perturbations such as harmonics, measurement noise and phase angle jump. Thus, the power quality improvement is achieved in terms of perfect current harmonics cancellation as well as power factor improvement.
Performance enhancement of shunt active power filter with fuzzy and hysteresi...
This paper proposes fuzzy and hysteresis controllers based three phase Shunt Active Power Filter
for current harmonic compensation to improve the performance of 3ɸ supply system feeding
non- linear loads. The Shunt Active Power Filter is used to eliminate current harmonics. The dc
link control strategy is based on the fuzzy logic controller. Gating pulses for the Shunt Active
Filter is generated using Hysteresis current controller based Pulse width modulation technique.
The proposed model is simulated in MATLAB/SIMULINK. Simulation results show that the
dynamic behavior is better than the conventional Proportional- Integral (PI) controller and is
found to be more robust for changes in load.
An improved control algorithm of shunt active filter for voltage regulation, ...
This paper deals with an implementation of a new control algorithm for a three-phase shunt active filter to regulate load terminal voltage, eliminate harmonics, correct supply power-factor, and balance the nonlinear unbalanced loads. A three-phase insulated gate bipolar transistor (IGBT) based current controlled voltage source inverter (CC-VSI) with a dc bus capacitor is used as an active filter (AF). The control algorithm of the AF uses two closed loop PI controllers. The dc bus voltage of the AF and three-phase supply voltages are used as feed back signals in the PI controllers. The control algorithm of the AF provides three-phase reference supply currents. A carrier wave pulse width modulation (PWM) current controller is employed over the reference and sensed supply currents to generate gating pulses of IGBT’s of the AF. Test results are presented and discussed to demonstrate the voltage regulation, harmonic elimination, power-factor correction and load balancing capabilities of the AF system.
Performance enhancement of actively controlled hybrid dc microgrid incorporat...
In this paper, a new energy control scheme is proposed for actively controlled hybrid dc microgrid to reduce the adverse impact of pulsed power loads. The proposed energy control is an adaptive current-voltage control (ACVC) scheme based on the moving average measurement technique and an adaptive proportional compensator. Unlike conventional energy control methods, the proposed ACVC approach has the advantage of controlling both voltage and current of the system while keeping the output current of the power converter at a relatively constant value. For this study, a laboratory scale hybrid dc microgrid is developed to evaluate the performance of the ACVC strategy and to compare its performance with the other conventional energy control methods. Using experimental test results, it is shown that the proposed strategy highly improves the dynamic performance of the hybrid dc microgrid. Although the ACVC technique causes slightly more bus voltage variation, it effectively eliminates the high current and power pulsation of the power converters. The experimental test results for different pulse duty ratios demonstrated a significant improvement achieved by the developed ACVC scheme in enhancing the system efficiency, reducing the ac grid voltage drop and the frequency fluctuations.
Adaptive Hysteresis Band Current Control for Transformer-less Single-Phase PV...
Current control based on hysteresis algorithms are widely used in different applications, such as motion control, active filtering or active/reactive power delivery control in distributed generation systems. The hysteresis current control provides to the system a fast and robust dynamic response, and requires a simple implementation in standard digital signal platforms. On the other hand, the main drawback of classical hysteresis current control lies in the fact that the switching
frequency is variable, as the hysteresis band is fixed. In this paper a variable band hysteresis control algorithm will be presented. As it will be shown, this variable band permits overcoming the aforementioned problem giving rise to an almost constant switching frequency. The performance of this algorithm, together with classical hysteresis controls and proportional resonant (PR) controllers, has been evaluated in three different single-phase PV inverter topologies, by means of simulations performed with PSIM. In addition, the behavior of the thermal losses when using each control structure in such converters has been studied as well.
Implementation of hysteresis current control for single phase grid connected ...
This paper describes a control method for single phase grid-connected inverter system for distributed generation application. Single-band Hysteresis Current Controller is applied as the control method. The control algorithm is implemented in Digital Signal Processor (DSP) TMS320F2812. The control method provides robust current regulation and achieve unity power factor. Simulation and experimental results are provided to demonstrate the effectiveness of the design.
A New Design Method of an LCL Filter Applied in Active DC-Traction Substations
This paper concentrates on the LCL filter with damping resistance intended to connect the shunt active power filter of an active DC-traction substation to the point of common coupling with the transmission grid. In order to find design conditions and conceive a design algorithm, attention is directed to the transfer functions related to currents and the associated frequency response. The mathematical foundation of the design method is based on the meeting the requirements related to the significant attenuation of the high-frequency switching current, concurrently with the unalterated flow of the current that needs to be compensated by active filtering. It is pointed out that there are practical limitations and a compromise must be made between the two requirements. To quantify the extent to which the harmonics to be compensated are influenced by imposing the magnitude response at both highest harmonic frequency to be compensated and switching frequency, a performance indicator is defined. As an additional design criterion, the damping power losses are taken into consideration. The validity and effectiveness of the proposed method are proved by simulation results and experimental tests on a laboratory test bench of small scale reproducing the specific conditions of a DC-traction substation with six-pulse diode rectifier.
Design and Control of Wind integrated Shunt Active Power Filter to Improve Po...
In this paper wind energy conservation system (WECS) with shunt active power filter (SAPF) is proposed for harmonics elimination, power factor correction, reactive power compensation and grid current balancing. Adaptive neuro fuzzy inference system (ANFIS) based controller is implemented at WECS side to control the boost converter to achieve MPP and at SAPF sides to minimize voltage variations and enhance power quality. Here, synchronous reference frame (SRF) theory based reference current generation technique is employed in SAPF. The proposed scheme is implemented in MATLAB/Simulink. The results confirm that this method has better performance and can maintain total harmonic distortion (THD) level of the system within the IEEE standard 519.
Power Quality Assessment of Voltage Positive Feedback Based Islanding Detecti...
Islanding refers to a condition where distributed generators (DGs) inject power solely to the local load after electrical separation from power grid. Several islanding detection methods (IDMs) categorized into remote, active, and passive groups have been reported to detect this undesirable state. In active techniques, a disturbance is injected into the DG’s controller to drift a local yardstick out of the permissible range. Although this disturbance leads to more effective detections even in well-balanced island, it raises the total harmonic distortion (THD) of the output current under the normal operation conditions. This paper analyzes the power quality aspect of the modified sliding mode controller as a new active IDM for grid-connected photovoltaic system (GCPVS) with a string inverter. Its performance is compared with the voltage positive feedback (VPF) method, a well-known active IDM. This evaluation is carried out for a 1 kWp GCPVS in MATLAB/Simulink platform by measuring the output current harmonics and THD as well as the efficiency under various penetration and disturbance levels. The output results demonstrate that since the proposed disturbance changes the amplitude of the output current, it does not generate harmonics/subharmonics. Thereby, it has a negligible adverse effect on power quality. It is finally concluded that the performance of the sliding mode-based IDM is reliable from the standpoints of islanding detection and power quality.
Front end buck rectifier with reduced filter size and single-loop control
This paper presents a transformerless solution for front-end rectification, which is particularly suitable for traction applications, requiring high voltages to be stepped down to appropriate dc voltage. The proposed topology is based on pulse widthmodulation buck rectifier (current source inverter topology) and is capable of rectification and stepping down of single-phase ac supply, in a single stage. A new control scheme is proposed to achieve constant dc output voltage and sinusoidal source current, irrespective of large ripples in the dc inductor current. The proposed scheme is configured in single-loop voltage control mode. The relevant small-signal model is derived from the large-signal model using multi order decomposition. An elaborate procedure of dc filter design is discussed, for circuit operation with minimum energy storage. All analytical results are validated by numerical simulation for sinusoidal and distorted source voltage. Experimental verification is achieved through a 1.2-kW grid-connected laboratory prototype.
Three phase unidirectional rectifiers with open-end source and cascaded float...
This paper presents two topologies of three-phase semicontrolled rectifiers suitable for open-end ac power sources. The rectifiers are composed by a combination of two-level three phase bridges (controlled, semicontrolled or uncontrolled), and three single-phase floating capacitor h-bridges (controlled). These topologies generate two powered dc-links, each one belonging to a three-phase bridge. They present a reduced number of controlled power switches if compared to other open-end configurations of similar complexity found in the literature. It is also proposed a space-vector pulse width modulation (SV-PWM) approach and a method of floating capacitor voltage control dedicated to the topologies, with an equivalent approach based on the level-shifted PWM (LS-PWM). The proposed SV-PWM solving method is based on a redundant state selection (RSS) technique, which allows the floating capacitors voltage regulation. On the other hand, the LS-PWM solving method is based on the neutral voltage selection, which is shown to be equivalent to the SVPWM RSS technique seen from the control system. Simulation results are shown to validate proposed topologies, as well as the SV-PWM and LS-PWM techniques, and the control strategy. Experimental results are shown to demonstrate proposed configurations feasibility.
Performance comparison of SVC and SSSC with POD controller for Power System S...
This document discusses a project comparing the performance of SVC and SSSC with a POD controller for improving power system stability. It presents the simulation results of applying SVC and SSSC with POD controllers to regulate voltage for different fault conditions. The simulation diagrams and expected results are shown through various figures. The conclusion indicates that SVC with POD controller is more effective at enhancing voltage stability and increasing transmission capacity compared to SSSC with POD controller based on the simulation results. Contact information is provided for those interested in the simulation results.
Matlab-based Simulation & Analysis of Three level SPWM Inverter
The multilevel began with the three level converters. The elementary concept of a multilevel converter to achieve higher power to use a series of power semiconductor switches with several lower voltage dc source to perform the power conversion by synthesizing a staircase voltage waveform. However, the output voltage is smoother with a three level converter, in which the output voltage has three possible values. This results in smaller harmonics, but on the other hand it has more components and is more complex to control. In this paper, different three level inverter topologies and SPWM technique has been applied to formulate the switching pattern for three level inverter that minimize the harmonic distortion at the inverter output. Simulation result has discussed.
Single phase active power filtering method using diode-rectifier-fed motor drive
This paper presents a single-phase high power factor motor drive system with active power filter function. Since most of electrical equipment connected to the grid must comply with regulations regarding grid current harmonics, motor drive systems are generally equipped with Power Factor Corrector (PFC) which is comprised of power switches and reactive components, e.g., inductor and capacitor. The reactive components are bulky and increase the system cost especially in low-cost applications such as electrical home appliances. In this paper, a new motor drive algorithm which is capable of both driving a permanent magnet motor and filtering the harmonic currents produced by other non-linear loads belong to the system is proposed. Since the input current of the drive system is directly controlled by manipulating not the motor current reference but the output voltage reference of the inverter, it is possible to achieve exact and immediate control of the grid current. The effectiveness of the proposed algorithms is validated by experiments with a permanent magnet motor drive system.
A simplified phase shift pwm-based feedforward distributed mppt method for gr...
The modularity and decreased filter size properties have made cascaded multilevel inverters (MLIs) more applicable than conventional two-level inverters, especially in high and medium power photovoltaic (PV) applications. However, partial shading of PV modules will affect negatively the output power of the unshaded modules. There are several existing solutions in the literature to address this challenge, however almost all of them suffer from complex implementations, low efficiency, and high cost. This paper presents a new simplified feedforward distributed maximum power point tracking (MPPT) method for three-phase grid-connected cascaded MLIs. The cascaded MLI provides a modular, and highly efficient single stage power conversion for PV systems. The proposed distributed MPPT method is depending on the phase-shift pulse width modulation (PSPWM) method with a simplified implementation. The proposed method is developing a feedforward signal that is proportional to the maximum power of the individual module. Then, the current controller, and the modulating signal are multiplied with the proportionality factor of the module maximum power. Furthermore, a modified modulation compensation method without using proportional-integral (PI) controllers is introduced to solve the problem of the unbalanced three-phase PV output currents that results from PV power mismatches and shading. A case study is implemented for 15 kW PV system to investigate the performance of the proposed method. In addition, comprehensive comparisons with the previous attempts in the literature are provided to verify the superior performance of the new proposed control method.
Power quality enhancement in residential smart grids through power factor cor...
The proliferation of non-linear loads and the increasing penetration of Distributed Energy Resources (DER) in Medium-Voltage (MV) and Low-Voltage (LV) distribution grids, make it more difficult to maintain the power quality levels in residential electrical grids, especially in the case of weak grids. Most household appliances contain a conventional Power Factor Corrector (PFC) rectifier, which maximizes the load Power Factor (PF) but does not contribute to the regulation of the voltage Total Harmonic Distortion (THDV ) in residential electrical grids. This manuscript proposes a modification for PFC controllers by adapting the operation mode depending on the measured THDV . As a result, the PFCs operate either in a low current Total Harmonic Distortion (THDI ) mode or in the conventional resistor emulator mode and contribute to the regulation of the THDV and the PF at the distribution feeders. To prove the concept, the modification is applied to a current sensorless Non-Linear Controller (NLC) applied to a single-phase Boost rectifier. Experimental results show its performance in a PFC front-end stage operating in Continuous Conduction Mode (CCM) connected to the grid with different THDV .
Reduced carrier PWM scheme with unified logical expressions for reduced switc...
The significant reduction in switch count of symmetrical/asymmetrical reduced switch count multilevel inverters (RSCMLI) topologies has modified the operation of inverter such that the conventional carrier-based pulse width modulation (PWM) schemes such as level-shifted PWM and phase-shifted PWM can no more realise them. To control these RSC-MLI topologies, reduced carrier PWM schemes with modified switching logic gained more prominence. These schemes involve suitable logical expressions to realise the switching states of the inverter. However, these logical expressions vary with topological arrangement and number of levels. Moreover, these schemes produce high total harmonic distortion (THD) in line-voltages. Therefore, to improve the line-voltage THD and generalise the switching logic, a modified reduced carrier PWM scheme with unified logical expressions is presented here. The proposed PWM scheme is directly valid for any topology and can be easily scalable to any number of levels in the inverters. To validate the implementation of the proposed PWM to control any RSC-MLI, experimental studies of various asymmetrical RSC-MLI topologies with the proposed PWM scheme are carried out. Further, to verify the superiority of the proposed scheme in terms of THD, complexity, scalability, and computation burden, its performance is compared with carrier-based PWM schemes reported in the literature.
Similar to ANALYSIS OF DISCRETE & SPACE VECTOR PWM CONTROLLED HYBRID ACTIVE FILTERS FOR POWER QUALITY ENHANCEMENT (20)
Harmonic Mitigation by SRF Theory Based Active Power Filter using Adaptive Hy...
Harmonic Mitigation by SRF Theory Based Active Power Filter using Adaptive Hy...
A New Circuit of Modular Multilevel Inverter for Grid-Connected Photovoltaic ...
A New Circuit of Modular Multilevel Inverter for Grid-Connected Photovoltaic ...
Simulation of distributed power flow controller for voltage sag compensation
Simulation of distributed power flow controller for voltage sag compensation
Performance Enhancement of Shunt Active Power filter using a Kalman Filter ba...
Performance Enhancement of Shunt Active Power filter using a Kalman Filter ba...
Performance enhancement of shunt active power filter with fuzzy and hysteresi...
Performance enhancement of shunt active power filter with fuzzy and hysteresi...
An improved control algorithm of shunt active filter for voltage regulation, ...
An improved control algorithm of shunt active filter for voltage regulation, ...
Performance enhancement of actively controlled hybrid dc microgrid incorporat...
Performance enhancement of actively controlled hybrid dc microgrid incorporat...
Adaptive Hysteresis Band Current Control for Transformer-less Single-Phase PV...
Adaptive Hysteresis Band Current Control for Transformer-less Single-Phase PV...
Implementation of hysteresis current control for single phase grid connected ...
Implementation of hysteresis current control for single phase grid connected ...
A New Design Method of an LCL Filter Applied in Active DC-Traction Substations
A New Design Method of an LCL Filter Applied in Active DC-Traction Substations
Design and Control of Wind integrated Shunt Active Power Filter to Improve Po...
Design and Control of Wind integrated Shunt Active Power Filter to Improve Po...
Power Quality Assessment of Voltage Positive Feedback Based Islanding Detecti...
Power Quality Assessment of Voltage Positive Feedback Based Islanding Detecti...
Front end buck rectifier with reduced filter size and single-loop control
Front end buck rectifier with reduced filter size and single-loop control
Three phase unidirectional rectifiers with open-end source and cascaded float...
Three phase unidirectional rectifiers with open-end source and cascaded float...
Performance comparison of SVC and SSSC with POD controller for Power System S...
Performance comparison of SVC and SSSC with POD controller for Power System S...
Matlab-based Simulation & Analysis of Three level SPWM Inverter
Matlab-based Simulation & Analysis of Three level SPWM Inverter
Single phase active power filtering method using diode-rectifier-fed motor drive
Single phase active power filtering method using diode-rectifier-fed motor drive
A simplified phase shift pwm-based feedforward distributed mppt method for gr...
A simplified phase shift pwm-based feedforward distributed mppt method for gr...
Power quality enhancement in residential smart grids through power factor cor...
Power quality enhancement in residential smart grids through power factor cor...
Reduced carrier PWM scheme with unified logical expressions for reduced switc...
Reduced carrier PWM scheme with unified logical expressions for reduced switc...
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Modelling and voltage control of the solar wind hybrid micro-grid with optimi...
Electricity generation from the wind and solar photovoltaic (PV) systems are highly dependent upon weather conditions. Their intermittent nature leads to fluctuations in their output. Therefore, the need for rapid compensation for energy transmission and distribution systems is increasingly important. Static Synchronous Compensator (STATCOM) can be adopted for reactive power compensation and for decreasing the voltage fluctuation caused by the system and renewable energy sources. This study presents modelling of a Solar PV-Wind Hybrid Micro-grid and the increase of the stable operating limit of the system in case of the incorporation of STATCOM is examined. The major contribution of this paper is the optimization of gain parameters of four PI controllers in STATCOM control circuit based on genetic algorithms (GA) and Bacteria Foraging Algorithm (BFA) and therefore obtaining better responses and voltage stability in terms of nonlinear nature of solar-wind hybrid micro-grid. The Simulink models of the system architecture include a wind turbine model, a solar PV power system model and a STATCOM. It is certified that the voltage fluctuation at the end of the bus bar is reduced by 8% using conventional PI controller, by 10% for GA-based PI controller, and by 15% for BFA based PI controller under variable load. The results obtained by GA and BFA-based optimization of PI controllers are compared with that of the conventional controller and better results attained.
Irradiance-adaptive PV Module Integrated Converter for High Efficiency and Po...
The strive for efficient and cost-effective photovoltaic systems motivated the power electronic design developed here. The work resulted in a DC-DC converter for module integration and distributed maximum power point tracking (MPPT) with a novel adaptive control scheme. The latter is essential for the combined features of high energy efficiency and high power quality over a wide range of operating conditions. The switching frequency is optimally modulated as a function of solar irradiance for power conversion efficiency maximization. With the rise of irradiance, the frequency is reduced to reach the conversion efficiency target. A search algorithm is developed to determine the optimal switching frequency step. Reducing the switching frequency may, however, compromise MPPT efficiency. Furthermore, it leads to increased ripple content. Therefore, to achieve a uniform high power quality at all conditions, interleaved converter cells are adaptively activated. The overall cost is kept low by selecting components that allow for implementing the functions at low cost. Simulation results show the high value of the module integrated converter for DC standalone and microgrid applications. A 400 W prototype was implemented at 0.14 Euro/W. Testing showed efficiencies above 95% taking into account all losses from power conversion, MPPT, and measurement and control circuitry.
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The document describes a novel droop control strategy for accurate power sharing in an isolated DC microgrid considering uncertainties and disturbances. It proposes using a sliding mode controller based on a Takagi-Sugeno fuzzy model to represent the nonlinear droop characteristics. The control strategy compensates for uncertainties and disturbances to achieve accurate proportional load power sharing without communication. The method is verified through PSIM/Matlab simulation to regulate load changes and ensure system stability in the DC microgrid.
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In this paper, a solar PV (Photovoltaic) array, a battery energy storage (BES), a diesel generator (DG) set and grid based EV charging station (CS) is utilized to provide the incessant charging in islanded, grid connected and DG set connected modes. The charging station is primarily designed to use the solar photovoltaic PV array and a BES to charge the electric vehicle (EV) battery. However, in case of exhausted storage battery and unavailable solar PV array generation, the charging station intelligently takes power from the grid or DG (Diesel Generator) set. However, the power from DG set is drawn in a manner that, it always operates at 80-85% loading to achieve maximum fuel efficiency under all loading conditions. Moreover, in coordination with the storage battery, the charging station regulates the generator voltage and frequency without a mechanical speed governor. It also ensures that the power drawn from the grid or the DG set is at unity power factor (UPF) even at nonlinear loading. Moreover, the PCC (Point of Common Coupling) voltage is synchronized to the grid/ generator voltage to obtain the ceaseless charging. The charging station also performs the vehicle to grid active/reactive power transfer, vehicle to home and vehicle to vehicle power transfer for increasing the operational efficiency of the charging station. The operation of the charging station is experimentally validated using the prototype developed in the laboratory.
High step up quasi-z source dc-dc converter
In this paper, a high step-up Quasi-Z Source (QZS) DC-DC converter is proposed. This converter uses a hybrid switched-capacitors switched-inductor method in order to achieve high voltage gains. The proposed converter have resolved the voltage gain limitation of the basic QZS DC-DC converter while keeping its main advantages such as continuous input current and low voltage stress on capacitors. Compared to the basic converter, the duty cycle is not limited, and the voltage stress on the diodes and switch isn’t increased. In addition to these features, the proposed converter has a flexible structure, and extra stages could be added to it in order to achieve even higher voltage gains without increasing the voltage stress on devices or limiting the duty cycle. The operation principle of the converter and related relationships and waveforms are presented in the paper. Also, a comprehensive comparison between the proposed and other QZS based DC-DC converters is provided which confirms the superiority of the proposed converter. Simulations are done in PSCAD/EMTDC in order to investigate the MPPT capability of the converter. In addition, the valid performance and practicality of the converter are studied through the results obtained from the laboratory built prototype.
Fuel cell integrated unified power quality conditioner for voltage and curren...
This document discusses a proposed Fuel Cell Integrated Unified Power Quality Conditioner (FCI-UPQC) system for improving power quality in a three-phase four-wire distribution grid. The FCI-UPQC uses a four-leg converter on the shunt side and three-leg converter on the series side. An adaptive neuro-fuzzy inference system controller is designed to maintain the DC link voltage. Simulation results in MATLAB/Simulink showed that the FCI-UPQC can effectively compensate for power quality issues like voltage sag, swell, harmonics, and neutral current imbalance. The inclusion of a fuel cell provides real power support during grid interruptions. The paper concludes that the proposed FCI-UPQC
Distributed incremental adaptive filter controlled grid interactive residenti...
This document describes a distributed incremental adaptive filter (DIAF) controlled utility interfaced photovoltaic (PV) - battery microgrid system that is presented with power quality features. The bidirectional controlled converter with a battery mitigates intermittency of a PV array under rapid weather variations. The DIAF control provides harmonics mitigation, load balancing and power factor improvement. It has been demonstrated that the DIAF based control of residential PV/battery microgrid system can continuously supply power by integrating battery backup with a PV array even during outages of the PV array and utility grid. Test results validated the control technique and power quality indices were within IEEE standards.
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ANALYSIS OF DISCRETE & SPACE VECTOR PWM CONTROLLED HYBRID ACTIVE FILTERS FOR POWER QUALITY ENHANCEMENT
- 1. ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 ANALYSIS OF DISCRETE & SPACE VECTOR PWM CONTROLLED HYBRID ACTIVE FILTERS FOR POWER QUALITY ENHANCEMENT ABSTRACT: It is known from the fact that Harmonic Distortion is one of the main power quality problems frequently encountered by the utilities. The harmonic problems in the power supply are caused by the non-linear characteristic based loads. The presence of harmonics leads to transformer heating, electromagnetic interference and solid state device mal-functioning. Hence keeping in view of the above concern, research has been carried out to mitigate harmonics. This paper presents an analysis and control methods for hybrid active power filter using Discrete Pulse Width Modulation and Space Vector Pulse Width Modulation (SVPWM) for Power Conditioning in distribution systems. The Discrete PWM has the function of voltage stability, and harmonic suppression. The reference current can be calculated by „d-q‟ transformation. In SVPWM technique, the Active Power Filter (APF) reference voltage vector is generated instead of the reference current, and the desired APF output voltage is generated by SVPWM. The THD will be decreased significantly by SVPWM technique than the Discrete PWM technique based Hybrid filters. Simulations are carried out for the two approaches by using MATLAB, it is observed that the %THD has been improved from 1.79 to 1.61 by the SVPWM technique.
- 2. ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 KEYWORDS: 1. Discrete PWM Technique 2. Hybrid Active Power Filter 3. Reference Voltage Vector, Space Vector 4. Pulse Width Modulation (SVPWM) 5. Total Harmonic Distortion (THD) 6. Voltage Source Inverter (VSI). SOFTWARE: MATLAB/SIMULINK BLOCK DIAGRAM: Figure 1. Configuration of an APF using SVPWM
- 3. ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 SIMULATION BLOCK DIAGRAM: Figure 2. Simulation circuit of hybrid shunt active power filter
- 4. ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 EXPECTED SIMULATION RESULTS: Figure 3. FFT analysis of source current with hybrid filter Figure 4. Simulation results of balanced linear load (a) The phase-A supply voltage and load current waveforms (b) The phase-A supply voltage and supply current waveforms Figure 5. Simulation results of unbalanced linear load (a) Three-phase load current waveforms (b) Three-phase supply current waveforms
- 5. ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 Figure 6. Simulation results of non-linear load (a) The three-phase source voltage waveforms (b) The three-phase load current waveforms (c) The three-phase source current waveforms Figure 7. Harmonic spectrum of non-linear load (a) The phase-A load current harmonic spectrum (b) The phase-A source current harmonic spectrum
- 6. ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 CONCLUSION: In this paper, a control methodology for the APF using Discrete PWM and SVPWM is proposed. These methods require a few sensors, simple in algorithm and are able to compensate harmonics and unbalanced loads. The performance of APF with these methods is done in MATLAB/SIMULINK. The algorithm will be able to reduce the complexity of the control circuitry. The harmonic spectrum under non-linear load conditions shows that reduction of harmonics is better. Under unbalanced linear load, the magnitude of three-phase source currents are made equal and also with balanced linear load the voltage and current are made in phase with each other. The simulation study of two level inverter is carried out using SVPWM because of its better utilization of DC bus voltage more efficiently and generates less harmonic distortion in three-phase voltage source inverter. This SVPWM control methodology can be used with series APF to compensate power quality distortions. From the simulated results of the filtering techniques, it is observed that Total Harmonic Distortion is reduced to an extent by the SVPWM Hybrid filter when compared to the Discrete PWM filtering technique i.e. from 1.78% to 1.61%. REFERENCES: [1] EI-Habrouk. M, Darwish. M. K, Mehta. P, “Active Power Filters-A Rreview,” Proc.IEE- Elec. Power Applicat., Vol. 147, no. 5, Sept. 2000, pp. 403-413. [2] Akagi, H., “New Trends in Active Filters for Power Conditioning,” IEEE Trans. on Industry applications, Vol. 32, No. 6, Nov-Dec, 1996, pp. 1312-1322. [3] Singh.B, Al-Haddad.K, Chandra.A, “Review of Active Filters for Power Quality Improvement,” IEEE Trans. Ind. Electron., Vol. 46, No. 5, Oct, 1999, pp. 960-971.