Active Power Filters with Unipolar Pulse Width Modulation to Reduce Switching Losses

Due to sensitivity of consumers on power quality and advancement in power electronics, active power filters (APF) continue to attract considerable attention. APF technology is the most efficient way to compensate reactive power and cancel lower order harmonics generated by nonlinear loads. This paper presents a hysteresis current control technique based on unipolar Pulse Width Modulation (PWM) with time and magnitude errors control to reduce switching losses and to improve the quality of output current. The validity of proposed method and achievement of desired compensation are shown by simulation results.