有源电力滤波器的最大谐波功率控制

传统有源电力滤波器(active power filter,APF)通过检测负载谐波电流进行谐波补偿,补偿对象固定单一,针对这个问题,提出一种新型的APF控制策略,只需检测并网点(point of common coupling,PCC)电压,就能对所有接入到电网的非线性负载进行补偿。首先对APF进行数学建模,接着介绍虚拟谐波电阻的基本原理及最大谐波功率点跟踪控制算法,通过该算法使APF吸收的谐波功率达到最大,并对直流电压外环和电流内环的比例-积分(PI)控制器参数进行设计,最后通过搭建PSCAD仿真模型,验证了所提控制策略的有效性。

Maximum Harmonic Power Control of Active Power Filter

The traditional active power filter (APF) performs harmonic compensation by detecting the load harmonic current, and the compensation object is fixed. For the above problem, this paper proposes a new APF control strategy. It only needs to detect the voltage of the point of common coupling (PCC), which can compensate all nonlinear load connected to power grid. Firstly, mathematical model of APF is built. Then the basic principle of virtual harmonic resistance and the maximum harmonic power point tracking control algorithm are introduced, which maximizes the harmonic power absorbed by APF. Moreover, the PI controller parameters of the DC voltage outer loop and the current inner loop are designed. Finally, the effectiveness of the proposed control strategy is verified by constructing the PSCAD simulation model.