Phase shift of the harmonic current is 180 degrees. When feedforward control is included in the system, the. Shunt active power filter for power quality improvement in. Threephase threelevel npc shunt active power filter. Shunt active power filters have been introduced as a way to overcome the power quality problems caused by nonlinear and reactive loads 9, 14, 23. Control of shunt active power filter for improvement of power quality. The shunt active filter has proved to be a useful device to harmonic currents and to compensate reactive power for linearnonlinear loads. Sensors free fulltext design of a measuring system. The proposed system consists of a small rated voltage source active power filter and a series of lc passive. An active power filter consists of one or more power electronic converters which utilize power semiconductor devices controlled by integrated circuits.
Matlabsimulink model based shunt active power filter using fuzzy logic controller to minimize the harmonics swati pal, pallavi singh bondriya, yogesh pahariya. This is the basic principle of shunt active power filter to eliminate the current harmonics and to compensate the reactive power. The shunt active power filter control algorithm is shown in fig. This paper presents a shunt hybrid active power filter.
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. Design and implementation of a shunt active power filter. Performance analysis of shunt active power filter with. A threephase shunt active power filter for damping of harmonic propagation in power distribution systems. Design and implementation of a shunt active power filter with reduced dc link voltage o. 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. The active power filters have gained much more attention because of its excellent performance to mitigate the harmonic and reactive power issues. The configuration of a system with shunt active filter. A threephase shunt active power filter for damping of.
This paper presents a novel approach to determine reference compensation currents of the threephase shunt active power filter apf under distorted andor imbalanced source voltages in steady state. This study focuses on the design of a measuring system for monitoring the power quality within the smart street lighting test polygon at university campuses with relation to testing an adaptive current control strategy for threephase shunt active power filters. Shunt active power filters sapfs are mainly used at customer end for the compensation of harmonics, reactive power, and input current balancing. 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.
Hysteresis control for current harmonics suppression using shunt active filter rajesh kr. 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. Shunt active power filter file exchange matlab central. 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. 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. Design of shunt active filter to improve power quality using. Shunt active power filtershapes of load, source and desired. Shunt active filter control strategies for power quality. Active power filter, hybrid filter, passive filter, current harmonic abstract this paper presents a shunt hybrid active power filter application mainly for current harmonic elimination and fixed reactive power compensation.
Nonlinear current control scheme of shunt active power filter. The shunt active power filter has proved to be a useful device to eliminate harmonic currents and to compensate reactive pow er for linearnonlinear loads. In this paper, a new control approach for a threephase fourwire shunt active power filter with pi and fuzzy controller under. Shunt active power filter for three phase four wire system. Shunt active power filter, voltage source converters, linear and nonlinear loads, pi controllers. Safp using power balance theory with hysteresis current controller. Active power filters are increasingly used to compensate for harmonics and reactive power generated by nonlinear loads which are installed by various utility.
Operation principle of system based on shunt active filter. Shunt active filter the concept of active filter uses power electronic equipment to produce harmonic. Simulation results of a shunt active power filter using p. The circuit configuration of shunt active power filter consisting of a filter inductor in series with pwm inverter is shown in figure 1. Ragavan k electrical engineering indian institute of technology gandhinagar gujarat, india382424 email.
Pdf comparative analysis on control methods of shunt active. Control strategy to get the accuracy of the apf and to simplify the control scheme, an advanced control strategy is designed as shown in. Pdf realtime control of shunt active power filter under distorted. Shunt active power filter active power harmonic filtering is a relatively new technology for eliminating harmonics which is based on the power electronics devices. Shunt active filters saf operation principle of a shunt active filter. Harmonic elimination and reactive power compensation for low voltage distribution systems on free shipping on qualified orders. Active filter cancels the harmonics present in load current, and source current will remain sinusoidal and in phase with neutral voltage. National institute of technology, rourkela certificate 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. Pdf shunt active power filter sapf has now become a.
Comparative analysis on control methods of shunt active power filter for harmonics mitigation. In this paper, an alternative control method is proposed to improve the harmonic suppression efficiency of the active power filter in a distorted and an. Shunt active power filters compensate current harmonics by injecting equal but opposite harmonic compensating current. Shunt active power filter for power quality improvement in distribution systems issn.
Matlab simulation of sliding mode control of shunt active. This vsi can acts as controlled current source and can provide required compensation. Design and simulation of three phase shunt active power. In this method, only active average real power from the load is used and remaining power i. The shunt active power filter apf is a device that is connected in parallel to and cancels the reactive and. Pdf simulation a shunt active power filter using matlab. The performance of a conventional threephase shunt active power filter apf using synchronous detection method sdm has been. This paper presents a simulation of sliding mode control of threephase shunt active power filter to improve the power quality using matlab power system blockset. 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. Shunt active power filter apf method have been used by many researchers as a solution in reducing the harmonics. Abdalla mohamed abdeiaziz mohmaed abdeihaflz fahmy from egypt a thesis submitted to electrical and computer control department in fulfillment of the requirements. Introduction 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. A two level shunt active power filter without pll for industrial loads. Pdf in this study, reduced current measurement control method is investigated.
Paper 7 include multilevel inverter based shunt active power filter in three phase three wire and four wire system. This is to certify that the thesis entitled implementation of active power filter. Student of power electronics, tit bhopal electrical engineering, tit bhopal electrical engineering, lnct bhopal abstract the problem of quality electrical energy provided to. Most of the power quality problems are introduce by the power electronics. The performance of shunt active filter is verified for rl load through. Dynamic modeling and control of shunt active power filter utkal ranjan muduli electrical engineering indian institute of technology gandhinagar gujarat, india382424 email.
One such equipment installed is the shunt active power filter which operates to lower the harmonic current flowing in the ac system. Mitigation of harmonics by shunt active power filter. Design of shunt active power filter by using an advanced. Threephase fourwire shunt active power filter for unbalanced nonlinear loads presented by eng. Pdf a two level shunt active power filter without pll. Developing a voltagesource shunt active power filter for improving power quality. Kalman filters for reference current generation in shunt active. This paper has analyzed a shunt hybrid active power filter consisting of a small rated voltage source active. Buy shunt active filter control strategies for power quality improvement.
Unlike conventional street lighting, smart elements are powered 247. Shunt active power filter model based on 400volts 3 phase 3 wire system. Active power filters have been widely used for harmonic elimination. These power electronics devices are designed with the goal of obtaining a power factor close to 1 and achieving current harmonics and reactive power compensation 5. Implementation of shunt active power filter sapf ethesis. 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 0. Design and simulation of three phase shunt active power filter using srf 653 figure 2. Matlabsimulink model based shunt active power filter. Dynamic modeling and control of shunt active power filter. Figure 1 illustrates a typical structure of the shunt apf connected to a main source. Due to the electronic character of the power part of such mass. The work presented in this thesis was carried out during. Hysteresis control for shunt active power filter under.
Shunt active power filter compensates current harmonics injecting equal and opposite harmonic compensating current. Pdf shunt active filter for power quality improvement. Shunt active filter series active filter and hybrid active filter. Pdf operation of shunt active power filter under unbalanced and. Nonlinear loads like variable speed drives, uninterrupted power supplies and all kind of rectifiers draw a nonsinusoidal current from the network. Shunt active power filter thesis pdf to the best of my knowledge, the matter embodied in the thesis has not been submitted to any.
Combination of passive, series and shunt active filters 4. Harmonics, thd, active filters, shunt active filter. 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 recent years, harmonic resonance or harmonic propagation between line inductances and shunt capacitors installed for power factor correction, and so on has multiplied voltage and current harmonics in industrial power plants and utility power distribution systems. Design of a shunt active power filter with grid connected. This paper presents a direct currentspacevector control of an active power filter apf based on a threelevel neutralpointclamped npc voltagesource inverter. Instantaneous pq theory is used for control technique. Shunt active power filter harmonic mitigation technique in.
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