并联型有源滤波器双馈复合谐波检测控制方法

Double-Fed Composite Detection Control of Harmonic Current for Shunt Active Power Filter

基于单次谐波电流提取提出用于并联型有源滤波器的网侧电流和负载侧电流双馈复合检测控制方法。在同步旋转坐标系下,通过对网侧电流的I调节反馈和负载电流P调节反馈检测结果进行综合,提取电流中的谐波成分作为有源电力滤波器的补偿指令。通过构建等效电路和传递函数分析该控制方法的动态性能与稳态性能,证明该方法在保证系统响应速度的同时,极大地减小了控制延迟、硬件延迟及采样精度对补偿效果的影响,达到无静差补偿效果。文中给出了模块化的算法实施方案,并研制了380 V/200 A有源滤波器样机对双馈复合谐波检测控制方法进行实验验证。

Based on single harmonic current extracting, the paper proposed a control method of grid current and load-side current double-fed composite detection for shunt active power filter. In synchronous rotating coordinate system, the results of the grid current I adjustment feedback and the load-side current P adjustment feedback are integrated. Meanwhile, the harmonic components of the cur- rent are extracted as APF compensation command. By constructing the equivalent circuit and the transfer function, dynamic perform- ance and steady-state performance of the control method are analyzed, which can be proved that the influence of control delay, hard- ware delay and sampling accuracy on compensation effect caused by will be decreased greatly, as well as the system response speed is ensured. Thus the result of zero static error compensation can be achieved. A 380 V/200 A APF prototype is developed to verify the control method of double-fed composite detection.