Active power filters have been widely used for harmonic elimination. Shunt active power filter shapes of load, source and desired. Matlabsimulink model based shunt active power filter using. A matrix converter produces significant harmonics and nonstandard frequency components into load. Pdf shunt active and series active filtersbased power quality. Lcl interface filter design for shunt active power filters article pdf available in advances in electrical and computer engineering 103 august 2010 with 282 reads how we measure reads. Shunt active filters, harmonic analysis, nonlinear control. Feb, 2014 in this method, only active average real power from the load is used and remaining power i. A new control algorithm based on the linear voltage control suitable for the proposed circuit is introduced. A sapf consists of a controllable voltage or current source. Pdf operation of shunt active power filter under unbalanced and.
Shunt active filter for reactive power compensation. Shunt active power filter model based on 400volts 3 phase 3 wire system. A technical survey on control strategies of active filter for. Proper selection of passive and active power quality. Pdf a repetitive based controller for a shunt active. Connection of the active filter to 3phase 4wire supply system. In the present work a new control algorithm based on instantaneous power theory pq theory for three phase four wire is taken for a shunt active power filter sapf to compensate harmonics and reactive power and power factor of a three phase. Design and implementation of a shunt active power filter with reduced dc link voltage o. Selective harmonic elimination using three phase shunt. The basic topology of the shunt active filter is a pwm controlled threephase voltage source inverter bridge. Schaffner emv ag white paper rating of harmonic filters december, 2008 515 the nonsinusoidal currents i white waveforms in figure 2, drawn from the sinusoidal voltage source, can be decomposed into two orthogonal components, ia active and ib reactive.
The idea behind this scheme is to enable access to the zero level of the active filter s input voltage so that a switching device is only switched during a halfcycle, while it remains either on or off during the other cycle. This paper proposes a doubleband hysteresis currentcontrol dbhcc scheme for singlephase shunt active filters. Shunt active filters saf operation principle of a shunt active filter. Design of a shunt active power filter with grid connected inverter control for a photovoltaic system thesis submitted in partial fulfillment of the requirements for the award of the degree of master of technology in power electronics and drives submitted by biswabharati majhi roll no2ee4326 under the guidance of prof. Pdf this paper proposes a series active filter and shunt active filter to. Shunt active power filter the principle of the shunt filter is to produce harmonic currents equal in magnitude but opposite in.
Design methodology for shunt active filters citeseerx. Instantaneous d frame driven shunt active filter for. Figure 7, figure 8 and figure 9 shows in the matlabsimulink environment the contents of the threephase power supply blocks, the threephase shunt active filter and the nonlinear load, respectively. Shunt active power filters have been introduced as a way to overcome the power quality problems caused by nonlinear. In this case, the shunt active power filter operates as a current source injecting the harmonic components generated by the load but phase shifted by 180 degrees. Basic principle of shunt active filter basic principle of shunt active filter is it compensates current harmonics by injecting equal but opposite harmonic compensating current. Introduction filters are networks that process signals in a frequencydependent manner.
Shunt active filter for power quality improvement, mauricio. The control strategy considers the presence of harmonics in the system voltage and load current simultaneously. Thus the power quality improvement using shunt active filter using anfis controller is proposed. The voltage source converter vsc is operated using rampcomparison current control. Reactive current is directly controlled without the need for sensing and computing the reactive component of the load current, thus simplifying the control system. Shunt active power filter for power quality improvement in distribution systems issn. Design and simulation of a shunt active filter in application. Operation principle of system based on shunt active filter.
The principle of shunt current compensation is very effective in compensating harmonic currents of loads. Shunt active filters are already commercially available, although much research is being done, yet. In this paper design of shunt active filter its control technique and performance for rl load is presented. Pdf the shunt active power filter to compensate reactive power. Therefore they can be considered to be harmonic current sources. A sliding mode control for fourwire shunt active filter in. In contrast to signal filters, the components of power filters must carry large currents or. Hysteresis control for current harmonics suppression using shunt active filter rajesh kr. Power converters require passive lowpass filters which are capable of reducing voltage ripples effectively. Pdf singlephase shunt active filter with digital control. Pdf lcl interface filter design for shunt active power filters. The proposed system compensates the sag and swell problems efficiently in matrix converter. Moreover, with an appropriate control scheme, the active power filter can also compensate the load power factor.
Implementation of shunt active filter for harmonic compensation in. Therefore, powerconditioning equipment is becoming more. In this way, the power distribution system sees the nonlinear load and the active power filter as an ideal resistor. Graham dudgeon, senior consultant, the mathworks, inc. The block diagram of shunt active power filter shown in fig 2. Design of shunt active filter to improve power quality.
Shunt active power filter file exchange matlab central. Pdf lcl interface filter design for shunt active power. A 3, 415v, 50hz supply with non linear load as diode rectifier having rl load and shunt active filter are developed in matlabsimulink using sim power system toolbox. Dr ahmed massoud university of strathclyde 2 facts 1. The system is modeled in matlab simulink to consist of an uncontrolled rectifier and an ac controller as the nonlinear loads, with an active filter to compensate for the harmonic current injected by the load. Power quality improvement in 3 phase system using shunt active filter a thesis submitted in partial fulfillment of the requirements for the degree of bachelor of technology in electrical engineering by subhransu satpathy 109ee0303 siddharth shankar bebarta 109ee0256 under guidance of prof. Pdf harmonics mitigation by pq theory based shunt active. Simulation of shunt active power filter controlled by. Implementation of psoann optimized pi control algorithm for. Shunt active filter block diagram the pq theory calculations are carried out in the shunt active power filter block shown in figure 6. This paper presents the design and simulation of a singlephase shunt active power filter for harmonic and power factor compensation of multiple nonlinear loads. Basic scheme of an active filter with shunt connection. Power quality enhancement using shunt active filter with.
A shunt active filter consists of three phase, three leg one for each phase, voltage source inverter. Lately also active series filters and hybrid systems combining active and passive filters have been considered. The paper describes the design aspect and control logic of a cascaded multilevel inverter. The voltage source inverter vsi based sapf is the most common type of filter used today, due to its well known topology and ease of installation. In this paper, a shunt active power filter sapf has been used to eliminate the harmonic distortion and to improve the power quality of threephase gridconnected power conditioning system pcs. The series and series shunt types of active filters are yet at prototype level. Shunt active filter an overview sciencedirect topics. Shunt active power filters compensate current harmonics by injecting equal but opposite harmonic compensating current. Shunt active power filter for harmonic compensation of. Shunt active power filter is commonly used to eliminate current harmonics generated in the source side due to presence of nonlinear loads. Design and implementation of a cascaded transformer coupled. The present paper deals with the sliding mode control of a threephase fourwire shunt active filter saf, to improve phasecurrent waveform, neutral current mitigation and reactive power compensation in electric power distribution system.
The control algorithm implemented in the controller of the shunt active filter determines the compensation characteristics of the shunt active filter. The performance of the shunt active filter depends upon the design of the filter components and control algorithm used to generate the reference current for the switching controller for the power device of the filter. Pdf shunt active filter for power quality improvement. The use of shunt active power filters apf to eliminate harmonic currents and to compensate reactive power for linearnonlinear loads has attracted much attention since the late 1970s fig. There are many ways to design a control algorithm for active filtering. The objective of the paper is to study, simulate and design a shunt active power filter capable of compensating current harmonics generated at the supply side due to presence of such nonlinear loads. The shunt active filter components are the filter inductance, dc link capacitance and power rat ing of the switching device. This paper explores the modeling of a proportional integral pi and fuzzy logic controller flc based, shunt active power filter sapf for a three wire network. A comparative study on compensating current generation. Design of a shunt active power filter with grid connected. Shows a system configuration of a singlephase or threephase shunt active filter is mainly used for compensate various types of current related problems. As a result, the series active filter operates as a dual circuit of the shunt active filter from a theoretical point of view. Developing a voltagesource shunt active power filter for improving power quality.
The work presented in this thesis was carried out during. The paper shows the pq theory of three phase shunt active power filter to improve the power quality of system which has non linear loads. A sliding mode control for fourwire shunt active filter. Design of a simple otabased mixedsignal controller for. This is a video demonstration of the simulink model of shunt apf. Phase shift of the harmonic current is 180 degrees.
Performance improvement of shunt active power filter by a new. The shunt active power filter was implemented using a three phase pwm current controlled voltage source inverter vsi and connected to the wind generator and loads in order to compensate the current harmonics and reactive power. This paper describes a novel control strategy for shunt active filters. Pdf modeling of shunt active power filter using pscademtdc. Dr ahmed massoud university of strathclyde 25 c s a s b s c s a s b s c v an v bn v cn v dct. May 08, 2018 this is a video demonstration of the simulink model of shunt apf.
This paper discusses how a combination of both active and passive filters is an economical solution for power quality improvement. Active power filter an overview sciencedirect topics. This control algorithm evolved from elemental synchronous reference frame engenders the fundamental reference signal from the load current with a phase shift of zero angle. Threephase shunt active filter for power electronic. To enhance the characteristics of passive filter and also the system, the active filter. Software used for this simulation is matlabsimulink. This is the basic principle of shunt active power filter to eliminate the current harmonics and to compensate the reactive power. This paper proposes a series active filter and shunt active filter to minimize the power quality impact present in matrix converters instead of passive filter. Pdf design and implementation of shunt active power.
It is possible to find active filters combined with passive filters as well as active filters of both types acting together. Hybrid and series active filters instantaneous power theory. Design and simulation of a shunt active filter in application for. In this manner a shunt active power filter can be used to eliminate current harmonics and reactive power compensation11. The shunt active filter provides current compensation, such that the compensated current drawn from the network is sinusoidal and balanced, corresponding to the fundamental positivesequence component of the load current, plus an additional fundamental positive. A simple control technique for threephase shunt active filters without computation of the reactive current component is presented. Experiences with shunt active filter to demonstrate the operation of shunt active filter measurement was made at a dcdrive without and with shunt active filter figure 9. It is difficult to build a high power pwm converter with.
This paper describes the development of a low cost shunt active power filter with digital control, which allows dynamic power factor correction and both. A repetitive based controller for a shunt active filter to compensate for reactive power and harmonic distortion. The most widespread topology is the shunt active filter consisting of six active switches, e. Active power filters such as shunt apfs, series apfs, hybrid apfs, unified. This article deals with the design of a threewire shunt active filter based on a acdc converter. The active threephase shunt filter is connected in parallel to the mains in order to decontaminate it. Combination of passive, series and shunt active filters 4. This paper presents a singlephase shunt active filter designed to minimize problems related to power quality in electrical systems. Again, the power topology of the active filter is basically the same as that of the active rectifier i. This paper proposes the optimum controller for shunt active filter saf to mitigate the harmonics and maintain the power quality in the distribution system. Design of shunt active power filter by using an advanced.
Design of shunt active filter to improve power quality using pq theory written by miss. Current control of the isolated selfexcited induction. Nonlinear loads like variable speed drives, uninterrupted power supplies and all kind of. Active filter, design, harmonics, threephase systems. Figure 1 illustrates a typical structure of the shunt apf connected to a main source. The performance of a conventional threephase shunt active power filter apf using synchronous detection method sdm has been. Shunt active filters instantaneous power theory and. Shunt active power filter the principle of the shunt filter is to produce harmonic currents equal in magnitude but opposite inphase to those harmonics that are present in the grid.
Shunt active filters are already commercially available, while the series and series shunt types are yet at prototype level. A new configuration for shunt active power filters abstract this thesis presents a new power circuit configuration to be used in shunt active power filters. The compensation characteristics of the shunt active power filter are shown in fig. The shunt active power filter operating principle is to inject into the power supply network the same harmonics current as that generated by the nonlinear load but in the opposite direction. In modern distribution systems the proliferation of nonlinear loads results in a deterioration of the quality of voltage waveforms at the point of common coupling pcc of various consumers. Pdf in this study, reduced current measurement control method is investigated for operation of 3phase 4wire shunt active power filter sapf under.
Design of a simple otabased mixedsignal controller for adaptive control system of shunt active power filter sombat vanichprapa1, cherdchai prapanavarat2, boonruk chipipop1 1. Design of shunt active power filter to eliminate the harmonic. Shunt active and series active filtersbased power quality. This example shows the use of a shunt active harmonic filter ahf to minimize the harmonic content propagated to the source from a nonlinear load. Design and implementation of a shunt active power filter with. As can be seen the curve form of the supply current is almost fundamental current only when. Design of shunt active power filter to eliminate the. Shunt active power filter for power quality improvement in. Comparative study of linear and nonlinear controls of three.
Finite control set model predictive control for a threephase shunt active power filter with a kalman filterbased estimation. Design of shunt active power filter for improvement of power. Designing of single phase shunt active filter using. The main function of shunt active power filter is to compensate current harmonics occurred on the load side. The shunt active filter provides current compensation, such that the compensated current drawn from the network is sinusoidal and balanced, corresponding to the fundamental positivesequence component of the. This paper deals with threephase fourwire shunt active filter to improve power quality. The pwmvsi gate control signals are derived from hysteresis band current controller. In this paper, only the odd harmonics have been studied, and the thd of the compensated current and transient response have been limited to 1. Shunt active filter for power quality improvement core. The basic concept of a filter can be explained by examining the frequency dependent nature of the impedance of capacitors and inductors. It proposes backstepping control based on lyapunov theory for the filter dc side voltage, and a modified.
Comprehensive research has been conducted on hybrid active filters for harmonic filtering, harmonic damping, harmonic isolation, and harmonic termination. From the received values of phase voltages v a, v b, v c, load currents i a, i b, i c and dc. Pdf power conditioning by shunt active filter ijirst. Pdf a control strategy for shunt active filter bobji. Consider a voltage divider where the shunt leg is a reactive impedance. Abstract in this paper the control of 3level shunt active power filter is proposed using frequency selective proportional plus multiple resonant controllers. A current controller with fast dynamics for an active filter is described. The shunt active filter is also consists of shunt converter with dc capacitor and shunt inductor. It is controlled to draw or supply a compensating current i c from or to the utility, so that it cancels current harmonics on the ac side. The configuration of a system with shunt active filter.
Dr ahmed massoud university of strathclyde 25 c s a s b s c s a s b. The current harmonics are injected by non linear loads so it is mainly used at load side and injects equal magnitude but opposite in phase to compensate reactive power and. Doubleband hysteresis currentcontrolled singlephase. Instantaneous d frame driven shunt active filter saf alleviate harmonics and reactive power. In patidarl and sing 2008, a fastacting lz controller for the shunt active power filter sapf is proposed. Power system using shunt active filter with synchronous detection method a thesis that has been submitted in partial fulfillment of the necessities for the degree of. Active power filter, hybrid filter, passive filter, current harmonic. Hysteresis control for shunt active power filter under. Design of shunt active filter to improve power quality using. The shunt active power filter to compensate reactive power and optimized thd with improved power by pi controller in a 3 phase 3 wire distribution network. Active filter cancels the harmonics present in load current, and source current will remain sinusoidal and in phase with neutral voltage. Active filters there are basically two types of active filters. It consists of shunt active filter, voltage source inverter vsi, series inductor and dc bus and nonlinear load. Nonlinear loads like variable speed drives, uninterrupted power supplies and all kind of rectifiers draw a nonsinusoidal current from the network.
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