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The most important part of the shunt active power filters is generating of gate signal for Voltage Source Inverters (VSI). In this paper the proposed Space Vector Pulse Width Modulation (SVPWM) is implemented in a closed loop control system for a shunt active power filter. The reference harmonic components are extracted from the sensed nonlinear load currents by applying the Synchronous Reference Frame (SRF) theory, where a three-phase thyristor bridge rectifier with R-L load is taken as the nonlinear load. The switching control algorithms of the proposed SVPWM would be generating appropriate switching gates to the voltage source inverter. The shunt active power filter generates the actual compensating harmonic current based on the switching gates provided by the controller. For showing the performance of proposed method a typical system has been simulated by MATLAB/SIMULINK. The proposed active power filter is able to improve about 30.18% of the total harmonic distortion (THD) for the distorted line current caused by an uncontrolled rectifier as the nonlinear load and to meet IEEE 519 standard recommendations on harmonics level.
Date of Conference: 20-22 July 2011