Implementation of threephase shunt active power filter using. The proposed system compensates the sag and swell problems efficiently in matrix converter. Shunt active power filter thesis proposal sangu ravindra, dr. Modeling of shunt active power filter for sliding mode control tracking of current reference. It consists of boost inductors, a threephase fullbridge power converter, and a dclink capacitor. The resulting total current drawn from the ac main is sinusoidal. Performance analysis of shunt active power filter in. Control strategy for shunt active power filters with. Style of shunt active power filter to get rid of the harmonic currents and also to compensate the reactive power under distorted as well as imbalanced source voltages in steady condition. The configuration of a system with shunt active filter. The three line currents of wind generator are calculated by the summation of. In this way, the power distribution system sees the non linear load and the active power filter as an ideal resistor. Design method in detail, dynamic response and steadystate characteristic in analysis.
Active harmonic filters ahf are power quality devices that monitor the nonlinear load and dynamically provide controlled current injection, which cancels out the harmonic currents in the electrical system. Principle of shunt active power filter apf download scientific. To improve the flexibility of compensation and the precision of threephase shunt active power filter apf. Create scripts with code, output, and formatted text in a. Analysis and simulation of harmonics current in power electronics.
This project report presents design, simulation and development of passive shunt filter and shunt hybrid power filter shpf for mitigation of the power quality problem at ac mains in acdc power supply. Abstract active power filters are widely used for the reduction of harmonics in the power system caused by nonlinear loads. In this case the shunt active power filter operates as a current source injecting the harmonic. Design and simulation of three phase shunt active power. The series lc filter used in the proposed system results in an increase on the current flowing through the active power filter. Rameshreddy is with eee department, gnits, hyderabad, mail abstract. Dynamic modeling and control of shunt active power filter. Shunt active power filter model based on 400volts 3 phase 3 wire system. Active power filters are increasingly used to compensate for harmonics and reactive power generated by nonlinear loads which are installed by various utility.
This paper presents the design and simulation of a singlephase shunt active power filter for harmonic and power factor compensation of multiple nonlinear loads. The simple shunt active filter arrangement with nonlinear load is considered. Clark transformation, self tuning filter, unbalanced load. Overview of passive harmonic filters power quality in. Cerning power systems has created conditions for a more extended use of active. Active power filter for compensation of reactive power and harmonics in 3phase 4wire. Shunt active power filter for power quality improvement in. Design and implementation of a shunt active power filter. This is a video demonstration of the simulink model of shunt apf. It is connected to the main power circuit, as shown in the singleline diagram of fig. The proposed control scheme can compensate harmonics and reactive. Certificate this is to certify that the thesis entitled, power quality improvement using passive shunt filter, tcr and tsc combination submitted by miss manjulata badi bearing roll no. To address it, this paper proposes a modified shunt apf system model to accurately reflect various stability problems. Ideally, the apf needs to generate just enough reactive and harmonic current.
T hey are built using a series of capacitors capacitance and reactors inductance forming an lc circuit in parallel with the power source. The interactions between shunt active power filter apf and capacitance load tend to result in stability problems and resonance. Development of shunttype threephase active power filter. Therefore they can be considered to be harmonic current sources. The conventional model of a shunt apf is not precise enough to reflect this phenomenon. Pdf lcl interface filter design for shunt active power. Shunt active power filter sapf is a power electronics converter that can inject current having same magnitude and opposite phase with that of original harmonics current. Thus they help to obtain compliance with all international. This paper presents a direct currentspacevector control of an active power filter apf based on a threelevel neutralpointclamped npc voltagesource inverter. How the active and passive filters shunt and series are. 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. The parameters of the fuzzy logic control membership functions and the weighting factors of the smflc can be tuned by mopso in such an approach to optimise the dynamic performance of the shunt active power filter sapf and minimise the total harmonic distortion thd of the source current waveform and voltage waveform of the hybrid fcpvwind.
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 power filter file exchange matlab central. Several harmonic suppression techniques have been widely proposed and applied to minimize harmonic effects. The basic topology of the shunt active filter is a pwm controlled three. Modified modeling and system stabilization of shunt active. Design of shunt active power filter to eliminate the. Threephase threelevel npc shunt active power filter. 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. Lcl interface filter design for shunt active power filters. A doubleloop compound current controller was proposed, which repetitive controller as the outer loop, the pi controller as the inner loop.
Introduction in a modern power system, due to broader applications of nonlinear loads such as power. Performance analysis of shunt active power filter with. Hysteresis control for shunt active power filter under. This paper also studies the mechanism of positive feedback. Threephase threelevel npc shunt active power filter performances based on pwm and anns controllers for harmonic current compensation chennai salim1 and benchouia mohamed toufik2 1electrical engineering department, birine nuclear research center, algeria, 2laboratory l. Three phase shunt active power filter using pq theory. Index termsactive power filter, park transformation. The work presented in this thesis was carried out during my ph. Design simulation and experimental investigations, on a shunt. It performs by first detecting the harmonic currents that are.
This vsi can acts as controlled current source and can provide required compensation. Mopsobased optimal control of shunt active power filter. Phase shift of the harmonic current is 180 degrees. Three phase shunt active power filter using pq theory s. They also correct poor displacement power factor dpf by compensating the systems reactive current.
Shunt active filters saf operation principle of a shunt active filter. Design and simulation of three phase shunt active power filter using srf theory rejil c1, anzarim2 and arun kumar r3 1. Download scientific diagram principle of shunt active power filter apf from publication. Shunt active power filter shunt active fitters are by far the most widely accept and dominant flitters of choice in most industrial processes. Fuzzy logic controller based threephase shunt active. More complex designs may involve multiple lc circuits, some of which may also include a resistor. Elimination of harmonics using active power filter based. Shunt active filter works as a current source which, when properly designed and. In this case the before the insertion of the shunt active power filter, total harmonic distortion thd of source current was 27. Implementation of threephase shunt active power filter using advanced current control strategy. Ecosine active harmonic filter active harmonic filters ahf are power quality devices that permanently monitor all kinds of nonlinear loads and dynamically provide precisely controlled current that cancel the entire spectrum of damaging harmonic currents at the point of connection. Combination of passive, series and shunt active filters 4. Active power filter consists of voltage source converter operating at relatively high frequency to give the output which is used for cancelling low order harmonics in the power system network. This model presents the analysis and simulation using matlab simulink of a threephase four wire neutral clamped active power filter apf compensating the harmonics and reactive power created by nonlinear balanced and unbalanced low power loads in steady state and in transients.
This paper has analyzed a shunt hybrid active power filter consisting of a small rated voltage source active power filter and a series 7 th tuned lc passive filter. Shunt active power filter for three phase four wire system. Threephase shunt active filter for power electronic. 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. It is also assumed that source inductance is small and thus the drop across the source inductance may be neglected. A shunt active power filter with instantaneous active and reactive power theory pq theory has been proposed for its performance and ability to compensate the harmonics and reactive power. And put forward the compound control strategy, which combine. Shunt active power filter the shunt active power filter apf is a device that is connected in parallel to and cancels the reactive and harmonic currents from a nonlinear load. This paper focuses on a fourwire shunt active power filter apf control scheme proposed to improve the performance of the apf. The active filter is connected in parallel at the pcc and is fed from the main power circuit. Proposed power control strategy simulink model of the apf the overall system model containing the power source, the apf and the nonlinear loads balanced and unbalanced is shown in figure 3. Nonlinear loads like variable speed drives, uninterrupted power supplies and all kind of rectifiers draw a nonsinusoidal current from the network. This filter is used to compensate harmonic distortion in threephase fourwire systems.
Dynamic modeling and control of shunt active power filter utkal ranjan muduli electrical engineering indian institute of technology gandhinagar gujarat, india382424 email. A matrix converter produces significant harmonics and nonstandard frequency components into load. The current compensation characteristic of the shunt active power filter is shown in fig. The concept applied is relatively old, but the lack of effective methods hampered.
The active power filters have gained much more attention because of its excellent performance to mitigate the harmonic and reactive power issues. Figure show the system configuration of the shunt design. Operation principle of system based on shunt active filter. Fuzzy based cascaded multilevel shunt active power filter for power line conditioners international journal of electrical and electronics engineering ijeee issn print. Paper 7 include multilevel inverter based shunt active power filter in three phase three wire and four wire system.
Improved tracking of shunt active power filter by sliding. This filter generates currents for the compensation of the nondesirable current components in the load current. One such equipment installed is the shunt active power filter which operates to lower the harmonic current flowing in the ac system. The basic structure of a shunt active power filter is shown in fig. Passive harmonic filters are currently the most common method used to control the flow of harmonic currents. Harmonic elimination and reactive power compensation for low voltage distribution systems paperback november 1, 2011. In this regard, a shunt active power filter sapf is recognized to be the most reliable instrument. Shunt active and series active filtersbased power quality.
Two shunt active power filters connected at the same point in the second case a 53kva diode bridge rectifier with a. Ragavan k electrical engineering indian institute of technology gandhinagar gujarat, india382424 email. This is the basic principle of shunt active power filter to eliminate the current harmonics and to compensate the reactive power. Shunt active power filters compensate current harmonics by injecting equal but opposite harmonic compensating current. Active power filter 1 active power filter 2 r r l c electric grid fig. How the active and passive filters shunt and series are helping for distortion of harmonics and improving power factor in distribution systems. The proposed shunttype threephase apf for wind generators is shown in figure 1.
Shunt active power filter thesis proposal i help to study. 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. Shunt active power filter for harmonic compensation of. However, the required dc link voltage is much less. Simulation results of a shunt active power filter using p.
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