A New Hysteresis Current Control Method for Active Power Filter With Lower Switching Losses

摘要

This paper presents a new hysteresis current control method for APF(active power filter) that can reduce switching losses effectively by means of adjusting the hysteresis band width according to the current size. On one hand, this method adjusts the overall hysteresis band width according to the size of absolute norm of current of three phase, which can optimize the overall switching frequency and reduce the total switching losses effectively. On the other hand, it adjusts hysteresis band width of each phase by adjusting the switching frequency of each phase according to the current size of each phase, so as to maintain overall control precision. Computer simulation is conducted on an electromagnetic transient program. The results show that the new method can effectively reduce the switching losses under the same control accuracy and total switching frequency.