A new current control method for active power filters with constant switch frequency

Abstract

In this paper a novel hysteresis current control method based on quasi optimized space voltage vectors for Active Power Filters (APF) with constant switching frequency is proposed. The location region of reference voltage vector is detected by a set of hysteresis comparators. Two appropriate switches are then selected to control the two corresponding inter phase currents independently. This method is characterized by constant switching frequency without estimating the parameter of the system, the high utilizing rate of DC voltage and good control accuracy. The comprehensive performance of APF is improved noticeably which is verified by computer simulation results.

提出了一種基于優化電壓矢量的有源濾波器定頻滯環電流控制新方法。該方法用一組滯環比較器判定參考電壓矢量所在區域 ,并據此選擇適當的兩相開關獨立地用定頻滯環控制技術控制相應的相間電流 ,以實現良好的電流跟蹤。這一方法的主要特點是無需估計系統阻抗參數即可用優化電壓矢量實現定頻滯環控制 ,因此既具有較高的直流電壓利用率和較高的控制精度 ,又保持了穩定的開關頻率 ,從而有效地提高了有源濾波器的綜合性能。計算機仿真結果表明了本方法的有效性。