Shunt active filters have proven to be excellent solution for current harmonics mitigation due to the use of non linear loads in power system. Application of nonlinear electrical devices has led to a distortion in the output sine waveforms of source current and voltage. Paper 7 include multilevel inverter based shunt active power filter in three phase three wire and four wire system. It is possible to find active filters combined with passive filters as well as active filters of both types acting together. Therefore, powerconditioning equipment is becoming more. Active power filter an overview sciencedirect topics. Sliding mode controller for four leg shunt active power. This paper describes the development of a low cost shunt active power filter with digital control, which allows dynamic power factor correction and both. Pdf in this study, reduced current measurement control method is investigated for operation of 3phase 4wire shunt active power filter sapf under. Design and simulation of three phase shunt active power. Control strategy to get the accuracy of the apf and to simplify the control scheme, an advanced control strategy is designed as shown in. The concept of dq frame to apply with the shunt active. Shows a system configuration of a singlephase or threephase shunt active filter is mainly used for compensate various types of current related problems. Harmonic extraction is the process in which, reference current is generated by using the distorted.
Output result of source current for this case is shown in fig. A matrix converter produces significant harmonics and nonstandard frequency components into load. The shunt active filter is connected to the threephase. Voltage level is to be maintained at nominal level by appropriately compensating reactive power using shunt and series compensating techniques by shunt active filter respectively. A sliding mode control for fourwire shunt active filter in. Shunt active power filter and its application ieee xplore. This topology based on four leg inverter, which is the most common one because of its good efficiency. Matlabsimulink model based shunt active power filter. If the harmonics of the load indicated in tableii is to be filtered by a conventional voltage source type active. Design of shunt active power filter to eliminate the. Connection of the active filter to 3phase 4wire supply system.
Pdf power conditioning by shunt active filter ijirst. There has been a tremendous growth of energy in past few years due to the advancement in technology to meet the rising demands of people and economic growth. Design and simulation of a shunt active filter in application for. The maximum harmonic order that an active power filter is able to compensate defines the filter bandwidth. Additionally, an interesting solution has been proposed for allowing the use of n1. Design of shunt active power filter to eliminate the harmonic. Active filter cancels the harmonics present in load current, and source current will remain sinusoidal and in phase with neutral voltage. The proposed system compensates the sag and swell problems efficiently in matrix converter. Singlephase shunt active power filter using indirect control. As can be seen the curve form of the supply current is almost fundamental current only when. The structure of the shunt active power filter is the voltage source inverter vsi. This is to certify that the thesis entitled study of single phase shunt active power filter submitted by swayam saswat to the national institute of technology, rourkela for the award of degree of bachelor of technology in electrical engineering is a bona fide record of research carried out by his under my supervision. Pdf shunt active power filter sapf has now become a wellknown sophisticated technology to overcome current harmonics and reactive.
In the proposed scheme one type of load has been considered as nonlinear loads. 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. Implementation of psoann optimized pi control algorithm for. 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. The simulink of shunt active power filter with sinusoidal pulse width modulation is shown in fig. 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. Performance analysis of shunt active power filter in. May 08, 2018 this is a video demonstration of the simulink model of shunt apf. It consists of three phase supply, three phase nonlinear load, rl filter, and shunt connected vsi active filter. Matlabsimulink model based shunt active power filter using.
Again, the power topology of the active filter is basically the same as that of the active rectifier i. The four leg shunt active power filter topology, fig. Shunt active and series active filtersbased power quality. In this manner a shunt active power filter can be used to eliminate current harmonics and reactive power compensation11. Shunt active filters instantaneous power theory and. Shunt active power filters compensate current harmonics by injecting equal but opposite harmonic compensating current. 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. Shunt active filter for power quality improvement citeseerx. Problems in distribution systems and their solutions. Pdf operation of shunt active power filter under unbalanced and. Study and analysis of performance of 3phase shunt active.
The pulse width modulation pwm with pi controller is used in the paper. Shunt active filters, harmonic analysis, nonlinear control, instantaneous power theory. Design and development of three phase shunt active filter. Threephase shunt active filter for power electronic. Combination of passive, series and shunt active filters 4. Lately also active series filters and hybrid systems combining. 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. A few aspects of power quality improvement using shunt. Shunt active power filter for power quality improvement in. A few aspects of power quality improvement using shunt active. Mathematical model and control strategy on dq frame for shunt. It may lead equipment connected to it to overheat and sometimes cause damage. Feb, 2014 the generalized diagram of shunt active filter is shown in figure 4. Then, the harmonic current amplification caused by the shunt active power filter is researched, and the analytical formula for the overload factor is derived to further correct the capacity of the shunt active power filter.
Shunt active filter saf is one among the various types of custom power devices proposed to improve the power quality 2. Shunt active power filter based on srf theory and hysteresis. In essence, the shunt active filter is designed to drain, from the electric grid, harmonic and reactive components of the load currents, such that the system current. This paper proposes the optimum controller for shunt active filter saf to mitigate the harmonics and maintain the power quality in the distribution system. Abstract this paper presents the mathematical model and control strategy on dq frame of shunt active power filter. Capacity calculation of shunt active power filters for.
A comparative study on compensating current generation. The system comprises balanced threephase voltage source feeding, a threephase diode bridge rectifier with resistance and inductance 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. This paper presents the design and simulation of a singlephase shunt active power filter for harmonic and power factor compensation of multiple nonlinear loads. Active filters, custom power devices, distributed generators, harmonic current compensation, power quality, shunt active power filter, sinusoidal current control strategy. The generalized diagram of shunt active filter is shown in figure 4. The current becomes near sinusoidal after compensation. This is a video demonstration of the simulink model of shunt apf. 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. Nonlinear loads like variable speed drives, uninterrupted power supplies and all kind of. Singlephase shunt active power filter in this topology the active power filter is connected in parallel to the utility and the. Active filters there are basically two types of active filters. The control block that calculates the instantaneous power takes as inputs the phase.
The shunt active filter can be properly controlled to present a selective compensation characteristic. This chapter covers in detail shunt active filters, including applications to three phase, fourwire systems. In this paper section 2 detailing about singlephase shunt active power filter, section 3 gives an idea about the indirect control strategy which is then followed by the simulation study and conclusions. 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. The most widespread topology is the shunt active filter consisting of six active switches, e. Using shunt active filter with synchronous detection method, submitted by preetam kumar nanda rollno110ee0212 in partial fulfillment of the necessities for the award of bachelor of technology in electrical engineering during session 202014 at national institute. Simulation results a number of simulations have been performed to check the working of the shunt active power filter under various nonlinear loadings w. Shunt active power filter shunt active power topology is most popular topology for current harmonics elimination due to easy implementation and good performance. However, the required dc link voltage is much less when compared with a standard voltage source type active power filter. 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. Shunt active filter an overview sciencedirect topics. 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. Singlephase shunt active filter with digital control icrepq20.
In figure 10 there is the current of a lift drive while accelerating without shunt active filter with the typical 6pulse rectifier current curve form. The active filter is connected in parallel at the pcc and is fed from the main power circuit. Another example shows the high dynamics of the shunt active filter when compensating fast changing harmonic producing loads. Harmonic extraction is the process in which, reference current is. Shunt active filters, harmonic analysis, nonlinear control. This paper concentrates on the design and application of threephase shunt active power filter sapf by using pq theory to mitigate the harmonics which are created by nonlinear loads. Shunt active filter for power quality improvement, mauricio. The active filter concept uses power electronic equipment to produce harmonic current components that cancel the harmonic current components that. Performance analysis of shunt active power filter with. 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.
The configuration of a system with shunt active filter. Figure show the system configuration of the shunt design. The simple shunt active filter arrangement with nonlinear load is considered. Shunt active power filter sapf behaves as a three phase controlled current source and it generates compensation current in phase opposition to the harmonics current that depends.
Shunt active filter block diagram the pq theory calculations are carried out in the shunt active power filter block shown in figure 6. Abstract active power filters are widely used for the reduction of harmonics in the power system caused by nonlinear loads. Shunt active filter has the capability for compensating load harmonic currents and reactive power requirement of the non linear loads in power network. Design of shunt active power filter by using an advanced. Moreover, comparison of effective elimination of low order harmonics is shown in fig. Simulation results of a shunt active power filter using pq. Shunt active filter is presented in the following sections. The shunt active filter is also consists of shunt converter with dc capacitor and shunt inductor. Design and simulation of a shunt active filter in application. From the received values of phase voltages v a, v b, v c, load currents i a, i b, i c and dc. Active filter can be classified based on the connection scheme as. Operation principle of system based on shunt active filter. Shunt active power filter for harmonic compensation of. Sapf is recognized to be the most reliable instrument.
Mathematical model and control strategy on dq frame for. Conclusion performance of shunt active power filter is checked with the use of matlab software. Design and simulation of three phase shunt active power filter using srf theory rejil c1, anzarim2 and arun kumar r3 1. In figure 11 there is the same current when active filter is on. This is the basic principle of shunt active power filter to eliminate the current harmonics and to compensate the reactive power. 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. Lately also active series filters and hybrid systems combining active and passive filters have been considered. Pdf shunt active filter for power quality improvement. This paper presents a direct currentspacevector control of an active power filter apf based on a threelevel neutralpointclamped npc voltagesource inverter. This paper presents a novel method for generating the compensating current signal. This is to certify that the thesis entitled study of single phase shunt active power filter submitted by swayam saswat to the national institute of technology, rourkela for the award of degree of bachelor of technology in electrical engineering is a bona fide record of. A shunt active filter is capable of removing harmonic currents from the supply of commercial and industrial sites. A sliding mode control for fourwire shunt active filter.
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