Development of Single-Phase Active Power Filter Using Current Source Inverter (CSI)

This paper presents the development of an Active Power Filter (APF) using Current Source Inverter (CSI). The function of the APF is to fix the pulsating nature of a distorted AC supply current waveform produced by a nonlinear load. The APF utilises 4 IGBT switches controlled by an Active Pulse Width Modulation (APWM) signal generated by a current control loop. The closed-loop controller is built up using a subtractor circuit, Proportional-Integral (PI) controller and comparator circuit; to compensate the distorted AC supply current to be continuous, sinusoidal and in phase with a supply voltage waveform. The application of the APF may reduce the Total Harmonic Distortion (THD) level of the AC supply current, thus, it increases the power factor and quality of a power supply system. The THD value obtained is compared with the IEEE 519 standard; to validate that the THD value follows the regulation. All simulation results illustrate that, by implementing the proposed APF, harmonic components of the AC supply current decreases to the acceptable limit introduced by the IEEE 519 standard. Simulation results are accomplished using MATLAB/Simulink.