MODELING AND CONTROL OF THREE-PHASE MULTILEVEL SHUNT ACTIVE POWER FILTER FOR MEDIUM VOLTAGE APPLICATIONS

Abstract

This paper describes the applications of five-level diode clamped Active Power Filter (APF) to the enhancement of medium voltage network power quality by compensation of harmonic currents produced by a nonlinear load. In the first part, the authors present a topology of five-level diode clamped Voltage Source Inverter (VSI), and its triangulo-sinusoidal Pulse Width Modulation (PWM) control strategy. In the second part, to remedy to instability problem of the input DC voltages of this APF, the authors propose to use a clamping bridge filter. After that, the sliding mode regulator used to control the APF is developed. The simulation results confirm the suitable performance of the filter after balancing the DC bus and using the sliding mode regulator.