基于瞬时电流直接控制的有源电力滤波器电流跟踪新方法

阐述了有源电力滤波器(APF)实现瞬时电流直接控制的基本理论,并藉此提出一套新型脉宽调制电流跟踪控制方法。该方法通过分析并网型逆变器不同开关状态对瞬时电流的直接控制作用得出一组瞬时电流位移因子算式。在调控输出电流时,采用脉宽调制方法选择不同瞬时电流位移因子并控制其作用时间,完成当前电流向下一时刻指令电流的转移,从而达到输出电流跟踪指令电流的控制目标。该方法仅用单数字信号处理器(DSP)系统即可实现有源电力滤波器的高性能快速检测与控制,简单实用,有效减小了输出滤波电感量。最后,通过两电平有源电力滤波器仿真实验证明新方法优于传统方法。

A Novel Current Tracking Method for Active Power Filter Based on Direct Transient Current Control

Principal theory of the direct transient current control method used for active power filter(APF) is described firstly,and based on which,a novel PWM current tracking control algorithm is proposed.By analyzing the direct control action of different switching states on the transient current,a set of current displacement factors are derived.The different current displacement factors and their action time are selected when the output current needs to be regulated.The control objective of output current tracking the command transient current value is achieved by transiting the transient current to the command value.The proposed method is simple and easy to use,and the quick measurement and control for the APF can be realized by one single digital signal proceeing(DSP) system.Also,the output inductance is reduced.Finally,the validity of the new method is proved by simulation results of a two-level,and more advantages are shown.