Performance enhancement of shunt active power filter with fuzzy and hysteresis controllers

•

0 likes•577 views

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 nonlinear 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.

Education

ELECTRICAL PROJECTS USING MATLAB/SIMULINK
Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245
Performance enhancement of shunt active power filter with fuzzy
and hysteresis controllers
For Simulation Results of the project Contact Us
Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245
ABSTRACT:
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.
KEYWORDS:
1. Shunt Active Power Filter(SAPF)
2. Fuzzy Logic Controller(FLC)
3. Hysteresis current controller
4. Harmonics
5. Total Harmonic Distortion (THD).
SOFTWARE: MATLAB/SIMULINK

This paper shows the method of improving the power quality using shunt active power filter. The proposedtopic comprises of PI controller, filter hysteresis current control loop, dc link capacitor. The switching signal generation for filter is fromhysteresis current controller techniques. With the all these element shunt active power filter reduce the total harmonic distortion. Thispaper represents the simulation and analysis of the using three phase three wire system active filter to compensate harmonics .Theproposed shunt active filter model uses balanced non-linear load. This paper successfully lowers the THD within IEEE norms and satisfactorily works to compensatecurrent harmonics.

Shunt active power filterRanganath

The Shunt Active Power Filter to Compensate Reactive Power and Harmonics with...

ijtsrd

In this paper is to study the denomination Power quality and large refers to maintaining a proximal sinusoidal power distribution bus voltage at rated magnitude and frequency. This is mainly affected by the generation of harmonics. Even though electronic and non-linear devices are flexible, economical and energy efficient, they may degrade power quality by creating harmonic currents and consuming excessive reactive power. This paper shows the method of improving the power quality using shunt active power filter with proposed optimized PI. The proposed topic comprises of PI controller, filter hysteresis current control loop, dc link capacitor. The switching signal generation for filter is from hysteresis current controller techniques. With the all these element shunt active power filter reduce the total harmonic distortion. Its source current, compensating current and THD values are studied, then PI control strategy is applied then the differences in THD are compared. The PI feedback compensation design starts with the small signal system' transfer function. Then an optimum constant of PI for a Shunt-APF is proposed and implemented to enhance its response to compensation of harmonics of linear and non-linear loads. The obtained results have demonstrated the ability to compensate the current harmonics effectively under distorted source conditions. The fluctuation in the dc bus voltage of the filter depends on the compensation speed of the outer loop that regulates the dc bus voltage. The proposed shunt active filter model uses balanced linear and non-linear load works successfully lowers the THD within IEEE norms and satisfactorily works to compensate current harmonics. The model is made in MATLAB SIMULINK and successfully reduces the harmonic in the source current. Mr. Amit Kumar Rajan | Dr. E Vijay Kumar"The Shunt Active Power Filter to Compensate Reactive Power and Harmonics with optimized PI controller in a 3 Phase 3 Wire Distribution System" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-5 , August 2018, URL: http://www.ijtsrd.com/papers/ijtsrd18196.pdf http://www.ijtsrd.com/engineering/electrical-engineering/18196/the-shunt-active-power-filter-to-compensate-reactive-power-and-harmonics-with-optimized-pi-controller-in-a-3-phase-3-wire-distribution-system/mr-amit-kumar-rajan

A study of hysteresis band current control scheme for shunt active power filt...

Asoka Technologies

This paper gives an analysis of harmonic currents in power electronics equipment produced by nonlinear loads.. Shunt active power filters (APF) play a key role to reduce harmonics current generated by nonlinear loads. Impact of shunt active power filter (APF) for compensating the harmonics current has been examined and analyzed by using Hysteresis current control technique. In this paper, harmonic control strategy is applied to compensate the current harmonics in the system. A comparative study between PI, HCC, adaptive HCC for the harmonic current mitigation has been used using shunt active filter technique. Simulated results are analyzed using MATLAB

Sapf2

Shivangni Sharma

Analysis of Shunt APF (Active PowerFilter)

Rajesh Dunna

Power Quality Improvement in 3-Φ Power System with Shunt Active filter using ...

AI Publications

Research paper focuses on enhancement of the power quality, Harmonic reduction and Reactive power compensation . Power quality problems became the foremost important concern now a days. Active filters with synchronous detection methodologies are vividly employed in distribution system to be sure that the harmonics generated by non-linear loads is reduced and leads to less voltage distortion and leads to lesser power superiority problems. The three physical characteristics that mostly underline the power quality and a power quality issues are Voltage, Current and Frequency. Harmonics is defined as a disturbance demonstrated in current or voltage or frequency waveforms which result in devastation, or failure of final equipment ..This paper examines the control of Shunt Active Power Filter with Synchronous Detection Method . Simulation results using MATLAB SIMULINK demonstrates the application of these methods to the control of Active Power Filter . Moreover, this work shows that how the power quality improvement in 3 phase is done with Synchronous Detection Method .

Simulation and Design of SRF based Control Algorithm for Three Phase Shunt Ac...

idescitation

Active power filters are effective in mitigating line current harmonics and compensating for the reactive power in the line. There are basically two types of Active Power Filters (APFs): shunt type and series type. Shunt active power filters (SAPFs) represent the most important and most widely used filters in industrial purposes, this is due not only to the fact that eliminate the harmonic current but also they are suitable for a wide range of power ratings. In this paper, Synchronous Reference Frame (SRF) theory is employed to calculate compensating currents while the three phase source is feeding a highly non-linear load. The main objective is to study and investigate the performance of Shunt active power filter using SRF theory. The algorithm is simulated under M ATLAB 7.8 environment using Simulinkand SimPowerSystems toolbox. The results shown are within the IEEE Standard 512-1992.

The increase of nonlinear loads due to the proliferation of electronic equipment causes power quality in the power system to deteriorate. Harmonic current drawn from a supply by the nonlinear load results in the distortion of the supply voltage waveform at the point of common coupling (PCC) due to the source impedance. Both distorted current and voltage may cause end-user equipment to malfunction, conductors to overheat and may reduce the efficiency and life expectancy of the equipment connected at the PCC.

Improvement of power quality using series active power filter

eSAT Publishing House

IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology

My bachelor level project presentation

Niraj Buyo

presentation of Conference On Electrical And Electronic Engineering 2015

sager alswed

The designed three phase SAPF based on instantaneous p-q theory was simulated in MATLAB /SIMULINK by using different load conditions i.e. R-L load, suddenly connected R-L load, and additional unbalance R load. Its application was successfully proved and the validity achieved by minimizing the harmonics and improving PF as summarized in Table 2. Consequently, the supply current is almost pure sinusoidal. THD observed was fund to be within the prescribed limits of 5% as recommended by IEEE-519 standard.

Performance analysis of three phase shunt hybrid active power filter

eSAT Journals

Abstract Active filtering of electric power has now become a mature technology for harmonic and reactive power Compensation in AC networks. The past several years have seen a rapid increase of power electronics-based loads connected to low and medium voltage power distribution systems. These loads draw non-sinusoidal current from the mains, degrading the power quality by causing harmonic distortion. This paper proposes a three phase Shunt Hybrid Active Filter (SHAF) topology for harmonic reduction and power factor improvement in low voltage power distribution systems. The compensation current reference for the proposed SHAF topology is obtained by using synchronous reference frame theorem. This theorem simplifies the equations for the current reference estimation in d-q co-ordinates thus leading to a more efficient and fast computation. To generate the compensation current that follows the current reference, the hysteresis current control method is adopted for 2-level VSI in low voltage system, the system is verified by developing simulation model using MATLAB/Simulink simulation package and the results are presented. The performance of shunt active filter and the proposed shunt hybrid active filter topology in reducing total harmonic distortion (THD) is compared for low voltage distribution system. Keywords: SAPF, SHPF, PI control, THD, Hysteresis current pulse width modulation, D-Q reference frame theory.

Attachment shcm

Benito Ortiz Bejar

Power Quality Improvement in Distribution System using ANN Based Shunt Active...

IAES-IJPEDS

This paper focuses on an Artificial Neural Network (ANN) controller based Shunt Active Power Filter (SAPF) for mitigating the harmonics of the distribution system. To increase the performance of the conventional controller and take advantage of smart controllers, a feed forward-type (trained by a back propagation algorithm) ANN-based technique is implemented in shunt active power filters for producing the controlled pulses required for IGBT inverter. The proposed approach mainly work on the principle of capacitor energy to maintain the DC link voltage of a shunt connected filter and thus reduces the transient response time when there is abrupt variation in the load. The entire power system block set model of the proposed scheme has been developed in MATLAB environment. Simulations are carried out by using MATLAB, it is noticed that the %THD is reduced to 2.27% from 29.71% by ANN controlled filter. The simulated experimental results also show that the novel control method is not only easy to be computed and implemented, but also very successful in reducing harmonics.

Active Power Filter

Jawad Iqbal

Harmonics created by nonlinear loads such as arc furnaces, cycloconverters and motor drives destroys the power quality in the system. They not only affect the working of adjacent loads but also shorten the life of power equipment by creating excessive losses. ‘Shunt Active Power Filter’ is a modern addition to family of compensating devices. It has superior qualities over its contemporaries namely SVCs and STATCOMs. It not only mitigates harmonics within the allowable limits defined by IEEE Std 519-1992, but also compensates unbalancing and reactive power in the system. Consequently, only active power is supplied by the source thus power factor approaches unity. A fully functional Simulink model of Shunt Active Power Filter has been designed based on ‘Instantaneous Power Theory’ or ‘p-q Theory’. The results of simulation comply with all the features described by the theory, justifying employment of SAPF in the industry.

Implementation of Instantaneous Reactive Power Theory for Current Harmonic Re...

IOSR Journals

Performance Analysis of Three-phase Four-wire Shunt Active Power Filter

ST. MARTIN'S ENGINEERING COLLEGE

Instantaneous Reactive Power Theory And Its Applications

arunj89

improvement of electrical power quality using series active and shunt passive...

Vikram Rawani

Application Of Shuntactive Power Filter Paper Presentation

guestac67362

POWER QUALITY IMPROVEMENT IN DC DRIVES BY SUPPRESSINGAravind Naragund

Power system harmonic reduction using shunt active filter

eSAT Publishing House

Application of Active Power Filter for Power Factor Correction of Nonlinear L...

Pravin Sonwane

Improvement of the electric power quality using

Vikram Rawani

P.F.C. Methods in Non-Linear Loads

Qasim AL Jubory

Design of shunt active power filter to mitigate harmonic

sager alswed

Enhancement of Power System Static and Dynamic Stability Using UPFC by GA and...

Garima Bharti

Exp passive filter (9)Sarah Krystelle

Adaptive-Hysteresis-Based-SHAF-Using-PI-and-FLC-Controller-for-Current-Harmon...Atul Sharma

What's hot

report of Improvement of the Electric Power Quality Using Series Active and S...

Vikram Rawani

Improvement of power quality using series active power filter

eSAT Publishing House

My bachelor level project presentation

Niraj Buyo

presentation of Conference On Electrical And Electronic Engineering 2015

sager alswed

Performance analysis of three phase shunt hybrid active power filter

eSAT Journals

Attachment shcm

Benito Ortiz Bejar

Power Quality Improvement in Distribution System using ANN Based Shunt Active...

IAES-IJPEDS

Active Power Filter

Jawad Iqbal

Implementation of Instantaneous Reactive Power Theory for Current Harmonic Re...

IOSR Journals

Performance Analysis of Three-phase Four-wire Shunt Active Power Filter

ST. MARTIN'S ENGINEERING COLLEGE

Instantaneous Reactive Power Theory And Its Applications

arunj89

improvement of electrical power quality using series active and shunt passive...

Vikram Rawani

Application Of Shuntactive Power Filter Paper Presentation

guestac67362

POWER QUALITY IMPROVEMENT IN DC DRIVES BY SUPPRESSINGAravind Naragund

Power system harmonic reduction using shunt active filter

eSAT Publishing House

Application of Active Power Filter for Power Factor Correction of Nonlinear L...

Pravin Sonwane

Improvement of the electric power quality using

Vikram Rawani

P.F.C. Methods in Non-Linear Loads

Qasim AL Jubory

Design of shunt active power filter to mitigate harmonic

sager alswed

Enhancement of Power System Static and Dynamic Stability Using UPFC by GA and...

Garima Bharti

What's hot (20)

report of Improvement of the Electric Power Quality Using Series Active and S...

Improvement of power quality using series active power filter

My bachelor level project presentation

presentation of Conference On Electrical And Electronic Engineering 2015

Performance analysis of three phase shunt hybrid active power filter

Attachment shcm

Power Quality Improvement in Distribution System using ANN Based Shunt Active...

Active Power Filter

Implementation of Instantaneous Reactive Power Theory for Current Harmonic Re...

Performance Analysis of Three-phase Four-wire Shunt Active Power Filter

Instantaneous Reactive Power Theory And Its Applications

improvement of electrical power quality using series active and shunt passive...

Application Of Shuntactive Power Filter Paper Presentation

POWER QUALITY IMPROVEMENT IN DC DRIVES BY SUPPRESSING

Power system harmonic reduction using shunt active filter

Application of Active Power Filter for Power Factor Correction of Nonlinear L...

Improvement of the electric power quality using

P.F.C. Methods in Non-Linear Loads

Design of shunt active power filter to mitigate harmonic

Enhancement of Power System Static and Dynamic Stability Using UPFC by GA and...

Viewers also liked

Exp passive filter (9)Sarah Krystelle

Adaptive-Hysteresis-Based-SHAF-Using-PI-and-FLC-Controller-for-Current-Harmon...Atul Sharma

Exp passive filter (4)Sarah Krystelle

Shunt active power filters based on diode clamped multilevel inverter and hys...Alexander Decker

Adaptive Modified Minimally Switched Hysteresis Controlled Shunt Active Power...

idescitation

The main focus of this article is to investigate the effects of Adaptive control on the switching frequency and Total Harmonic Distortion of a modified, minimally switched hysteresis controlled shunt active power filter. Reference current generation was done using Instantaneous real and reactive power algorithm. Pulses to the minimally switched grid interactive inverter in which only two switches are controlled at a time, had been generated using a modified hysteresis current controller. Use of Modified Hysteresis controller results in reducing the switching loses to one-third but results in increase in current THD than the conventional hysteresis controller. To overcome this, pulses to the modified hysteresis controller were generated employing adaptive control by modifying pulses from a conventional hysteresis controller. Using adaptive control instantaneous switching frequency was reduced and maintained nearly constant and THD was brought to the limits specified by the standards, thus overcoming the disadvantage of conventional and modified hysteresis controller which has variable switching frequency. A comparison of Modified Hysteresis controller with and without Adaptive control has been made, to show the reduction in THD. The system was simulated using MATLAB- SIMULINK.

Implementation of hysteresis current control for single phase grid connected ...

Asoka Technologies

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.

ACTIVE vs PASSIVE HARMONICS FILTERSJ A Simon

65 113-121

idescitation

Now-a-days, Internet has become an important part of human’s life, a person can shop, invest, and perform all the banking task online. Almost, all the organizations have their own website, where customer can perform all the task like shopping, they only have to provide their credit card details. Online banking and e-commerce organizations have been experiencing the increase in credit card transaction and other modes of on-line transaction. Due to this credit card fraud becomes a very popular issue for credit card industry, it causes many financial losses for customer and also for the organization. Many techniques like Decision Tree, Neural Networks, Genetic Algorithm based on modern techniques like Artificial Intelligence, Machine Learning, and Fuzzy Logic have been already developed for credit card fraud detection. In this paper, an evolutionary Simulated Annealing algorithm is used to train the Neural Networks for Credit Card fraud detection in real-time scenario. This paper shows how this technique can be used for credit card fraud detection and present all the detailed experimental results found when using this technique on real world financial data (data are taken from UCI repository) to show the effectiveness of this technique. The algorithm used in this paper are likely beneficial for the organizations and for individual users in terms of cost and time efficiency. Still there are many cases which are misclassified i.e. A genuine customer is classified as fraud customer or vise-versa.

Harmonics and mitigation techniques

rifat maryum

Harmonics in power systemMinh Anh Nguyen

Design Of Hybrid Series Active Filters for Harmonic Reduction in Single Phase...

IJMER

A Novel Approach of Harmonic Reduction with Transformer Connected 3-Phase Mul...

IJMER

This paper proposes a multilevel inverter arrangement employing a series connected transformer to suppress 5th,7th,11th &13th order harmonics(generated by non-linear loads).In the proposed scheme sinusoidal pwm signal generation technique is used for three phase multilevel VSI in conjunction with series connected transformer .The proposed model eliminates the need of output filter inductor. With this control strategy harmonic components of output voltage and switching losses can be minimized considerably. Simulation results verify the proposed concept and indicates that the transformer is capable of reducing the harmonics in the line

Viewers also liked (12)

Exp passive filter (9)

Adaptive-Hysteresis-Based-SHAF-Using-PI-and-FLC-Controller-for-Current-Harmon...

Exp passive filter (4)

Shunt active power filters based on diode clamped multilevel inverter and hys...

Adaptive Modified Minimally Switched Hysteresis Controlled Shunt Active Power...

Implementation of hysteresis current control for single phase grid connected ...

ACTIVE vs PASSIVE HARMONICS FILTERS

65 113-121

Harmonics and mitigation techniques

Harmonics in power system

Design Of Hybrid Series Active Filters for Harmonic Reduction in Single Phase...

A Novel Approach of Harmonic Reduction with Transformer Connected 3-Phase Mul...

Similar to Performance enhancement of shunt active power filter with fuzzy and hysteresis controllers

Harmonic Mitigation by SRF Theory Based Active Power Filter using Adaptive Hy...

Asoka Technologies

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

Three phase transformerless shunt active power filter with reduced switch cou...

Asoka Technologies

Shunt active power filter is the preeminent solution against nonlinear loads, current harmonics and power quality problems. APF topologies for harmonic compensation use numerous high-power rating components and are therefore disadvantageous. Hybrid topologies combining low-power rating APF with passive filters are used to reduce the power rating of voltage source inverter. Hybrid APF topologies for high-power rating systems use a transformer with large numbers of passive components. In this paper, a novel four-switch two-leg VSI topology for a three-phase SAPF is proposed for reducing the system cost and size. The proposed topology comprises a two-arm bridge structure, four switches, coupling inductors, and sets of LC PFs. The third leg of the three-phase VSI is removed by eliminating the set of power switching devices, thereby directly connecting the phase with the negative terminals of the dc-link capacitor. The proposed topology enhances the harmonic compensation capability and provides complete reactive power compensation compared with conventional APF topologies. The new experimental prototype is tested in the laboratory to verify the results in terms of total harmonic distortion, balanced supply current, and harmonic compensation, following the IEEE-519 standard.

Design and Control of Wind integrated Shunt Active Power Filter to Improve Po...

Asoka Technologies

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.

A New Design Method of an LCL Filter Applied in Active DC-Traction Substations

Asoka Technologies

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.

Power Quality Analysis and Enhancement of Grid Connected Solar Energy System

Asoka Technologies

In recent years, renewable energy resources are utilized to meet the growing energy demand. The integration of renewable energy resources with the grid incorporates power electronic converters for conversion of energy. These power electronic converters introduce power quality issues such as a harmonics, voltage regulation etc. Hence, to improve the power quality issues, this work proposes a new control strategy for a grid interconnected solar system. In this proposed work, a maximum power point tracking (MPPT) scheme has been used to obtain maximum power from the solar system and DC/DC converter is implemented to maintain a constant DC voltage. An active filtering method is utilized to improve the power quality of the grid connected solar system. The proposed system is validated through dynamic simulation using MATLAB/Simulink Power system toolbox and results are delivered to validate the effectiveness of the work.

An efficient modified cuk converter with fuzzy based maximum power point trac...

Asoka Technologies

To improve the performance of photovoltaic system a modified cuk converter with Maximum Power Point Tracker (MPPT) that uses a fuzzy logic control algorithm is presented in this research work. In the proposed cuk converter, the conduction losses and switching losses are reduced by means of replacing the passive elements with switched capacitors. These switched capacitors are used to provide smooth transition of voltage and current. So, the conversion efficiency of the converter is improved and the efficiency of the PV system is increased. The PV systems use a MPPT to continuously extract the highest possible power and deliver it to the load. MPPT consists of a dc-dc converter used to find and maintain operation at the maximum power point using a tracking algorithm. The simulated results indicate that a considerable amount of additional power can be extracted from photovoltaic module using a proposed converter with fuzzy logic controller based MPPT

Improved dynamic performance of shunt active power filter using particle swar...

Asoka Technologies

In this paper, a novel particle swarm optimization (PSO) technique is proposed to tune the proportional-integral (PI) controller gain parameters for enhancing the dynamic performance of the shunt active power filter (APF). The shunt APFs are well established filter to compensate current harmonics, reactive power to maintain the power factor unity. The compensation is highly influenced by the DC-link voltage regulation.

ANALYSIS OF DISCRETE & SPACE VECTOR PWM CONTROLLED HYBRID ACTIVE FILTERS FOR ...

Asoka Technologies

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.

At245 seven level shunt active power filterAsoka Technologies

Performance Enhancement of Shunt Active Power filter using a Kalman Filter ba...

Asoka Technologies

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.

An improved control algorithm of shunt active filter for voltage regulation, ...

Asoka Technologies

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.

Single-Phase Grid-tied Transformerless Inverter of Zero Leakage Current for P...

Asoka Technologies

Multi-level transformerless inverters are widely used in grid-tied PV systems since they characterized by higher efficiency and lower cost. In this context, new topologies, modulation, and control schemes were presented to solve problems of a common-mode voltage and leakage current. This work proposes a transformerless five-level inverter with zero leakage current and ability to reduce the harmonic output content for a grid-tied single-phase PV system. The neutral of the grid links to a common on which the negative and the positive terminals of the DC-link are connected via parasitic capacitors that can eliminate the leakage current. The proposed topology, with its inherent circuit structure, leads to boost the overall efficiency. Simulation and experimental results show almost zero leakage current and a high-quality output when maintaining balanced capacitor voltages on the DC-link input. The experimental results show 1.07% THD and 96.3 % maximum efficiency when injecting a power of 1.1 kW that verify the performance of the proposed inverter with PV sources.

New control strategy for three phase grid-connected lcl inverters without a p...

Asoka Technologies

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.

High frequency ac-link pv inverter

Asoka Technologies

In this paper, a high-frequency ac-link photovoltaic (PV) inverter is proposed. The proposed inverter overcomes most of the problems associated with currently available PV inverters. In this inverter, a single-stage power-conversion unit fulfills all the system requirements, i.e., inverting dc voltage to proper ac, stepping up or down the input voltage, maximum power point tracking, generating low-harmonic ac at the output, and input/output isolation. This inverter is, in fact, a partial resonant ac-link converter in which the link is formed by a parallel inductor/capacitor (LC) pair having alternating current and voltage. Among the significant merits of the proposed inverter are the zero-voltage turn-on and soft turn-off of the switches which result in negligible switching losses and minimum voltage stress on the switches. Hence, the frequency of the link can be as high as permitted by the switches and the processor. The high frequency of operation makes the proposed inverter very compact. The other significant advantage of the proposed inverter is that no bulky electrolytic capacitor exists at the link. Electrolytic capacitors are cited as the most unreliable component in PV inverters, and they are responsible for most of the inverters’ failures, particularly at high temperature. Therefore, substituting dc electrolytic capacitors with ac LC pairs will significantly increase the reliability of PV inverters. A 30-kW prototype was fabricated and tested. The principle of operation and detailed design procedure of the proposed inverter along with the simulation and experimental results are included in this paper. To evaluate the long-term performance of the proposed inverter, three of these inverters were installed at three different commercial facilities in Texas, USA, to support the PV systems. These inverters have been working for several months now.

Designing of Multilevel DPFC to Improve Power Quality

Asoka Technologies

According to growth of electricity demand and the increased number of non-linear loads in power grids, providing a high quality electrical power should be considered. In this paper, Enhancement of power quality by using fuzzy based multilevel power flow controller (DPFC) is proposed. The DPFC is a new FACTS device, which its structure is similar to unified power flow controller (UPFC). In spite of UPFC, in DPFC the common dc-link between the shunt and series converters is eliminated and three-phase series converter is divided to several single-phase series distributed converters through the line. This eventually enables the DPFC to fully control all power system parameters. It, also, increases the reliability of the device and reduces its cost simultaneously. In recent years multi level inverters are used high power and high voltage applications .Multilevel inverter output voltage produce a staircase output waveform, this waveform look like a sinusoidal waveform leads to reduction in Harmonics. Fuzzy Logic is used for optimal designing of controller parameters. Application of Fuzzy Multilevel DPFC for reduction of Total Harmonic Distortion was presented. The simulation results show the improvement of power quality using DPFC with Fuzzy logic controller.

Designing of multilevel dpfc to improve power quality

Asoka Technologies

Designing of multilevel dpfc to improve power quality

Asoka Technologies

Model predictive control of pv sources in a smart dc distribution system maxi...

Asoka Technologies

In a dc distribution system, where multiple power sources supply a common bus, current sharing is an important issue. When renewable energy resources are considered, such as photovoltaic (PV), dc/dc converters are needed to decouple the source voltage, which can vary due to operating conditions and maximum power point tracking (MPPT), from the dc bus voltage. Since different sources may have different power delivery capacities that may vary with time, coordination of the interface to the bus is of paramount importance to ensure reliable system operation. Further, since these sources are most likely distributed throughout\ the system, distributed controls are needed to ensure a robust and fault tolerant control system. This paper presents a model predictive control-based MPPT and model predictive control-based droop current regulator to interface PV in smart dc distribution systems. Back-to-back dc/dc converters control both the input current from the PV module and the droop characteristic of the output current injected into the distribution bus. The predictive controller speeds up both of the control loops, since it predicts and corrects error before the switching signal is applied to the respective converter.

Novel High Performance Stand Alone Solar PV System with High Gain, High Effic...

Asoka Technologies

This paper proposes a novel 3- stand-alone solar PV system configuration that uses high gain, high efficiency (96%) dc-dc converters both in the forward power stage as well as the bidirectional battery interface. The high voltage gain converters enable the use of low voltage PV and battery sources. This results in minimization of partial shading and parasitic capacitance effects on the PV source. Series connection of a large number of battery modules is obviated, preventing the overcharging and deep discharging issues that reduce the battery life. Also, the proposed configuration facilitates "required power tracking (RPT)" of the PV source as per the load requirements eliminating the use of expensive and 'difficult to manage' dump loads. High performance inverter operation is achieved through abc to dq reference frame transformation, which helps in generating precise information about the load's active power component for RPT, regulation of ac output voltage and minimization of control complexity. Inverter output voltage is regulated by controlling the modulation index of sinusoidal pulse width modulation, resulting in a stable and reliable system operation. The active power demand is controlled by regulating the dc link voltage. All the analytical, simulation and experimental results of this work are presented.

Simulation of distributed power flow controller for voltage sag compensation

Asoka Technologies

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.

Similar to Performance enhancement of shunt active power filter with fuzzy and hysteresis controllers (20)