基于PCPR控制的APF死区补偿策略

APF Dead Zone Compensation Strategy Based on PCPR Control

为解决有源电力滤波器(APF)实际输出电流频率范围宽,而传统基于比例谐振控制器(PR)的死区补偿方法补偿频率范围有限的问题,分析死区效应机理及PR控制器的局限性,提出一种基于零极点配置的相位补偿比例谐振(PCPR)控制的死区补偿策略。该方法能够在死区补偿控制器谐振频率超过系统截止频率时对死区效应引起的电流畸变进行精确补偿,不但扩大死区引起谐波电流的补偿范围而且改善了系统动态性能。仿真和实验结果验证了所提补偿策略能有效减小APF网侧输出电流总谐波畸变率。

The range of output current frequency of active power filter(APF)under the actual working conditions is wide,but the traditional dead band compensation method based on proportional resonance controller(PR)compensates has the limited frequency range.In order to solve this problem,based on the analysis of the dead-band effect mechanism and the limitations of the PR controller,a dead-band compensation strategy based on zero-pole configuration with phase-compensated proportional resonance(PCPR)control was proposed.This method can accurately compensate the current distortion caused by the dead-band effect when the resonant frequency of the dead-band compensation controller exceeds the system cut-off frequency,which not only enlarges the compensation range of the harmonic current caused by the dead zone,but also improves the dynamic performance of the system.Simulation and experimental results verify that the proposed compensation strategy can effectively reduce the total harmonic distortion rate of APF grid-side output current.