基于 d－q 坐标系的有源电力滤波器双闭环控制策略的研究

摘要

In general, the active power filter is required to filter harmonic current within 50 times for ordinary indus-trial load.The traditional PI control can only be carried out on the dc component without difference; what’s more, the bandwidth is not enough.In order to solve this problem, the current loop controller which is feed forward decou-pled in d-q synchronous rotating coordinates is improved in this paper, and the hybrid control strategy which is com-posed of the parallel connection of repetitive control and parameter self-adjusting fuzzy PI control is proposed, the pa-rameters of repetitive control loop are optimized.For the traditional PI control strategy of voltage outer loop, for the setting of the PI parameters is rather complex, when the load of the system experiences acute fluctuation, it will be un-able to maintain stability and then generate a lot of ripple, the robustness of the system will be worse, so this paper will use the Fuzzy-PI dual-mode control strategy.For the aboved control strategy, the simulation model is set up on computer, the results show that compared to the traditional PI control strategy, the introduction of composite control strategy has faster dynamic response speed and higher precision of harmonic compensation, and compared to the tradi-tional PI control strategy in the dc side, the introduction of the Fuzzy-PI dual-mode control strategy has good robust-ness and fast response.%一般对于普通工业负荷来说，要求有源电力滤波器滤除50次以内的谐波电流。传统的 PI 控制只能对直流分量进行无差控制，而且其带宽也不够。为了解决这个问题，文章对在 d－q 同步旋转坐标下前馈解耦的电流环控制器进行改进，引入重复控制与参数自调节模糊 PI 控制并联的复合控制策略，对重复控制回路参数进行了优化设计。对于传统的电压外环 PI 控制策略，因其参数整定复杂，且当系统负荷剧烈变化时无法保持稳定而产生大量纹波，鲁棒性差，对此文章采用模糊－PI 双模控制策略。对于上述控制策略，在计算机上搭建其仿真模型，结果表明复合控制策略较 PI 控制策略具有更快的动态响应速度和更高的谐波补偿精度，而直流侧引入模糊－PI 双模控制策略较之传统 PI 控制鲁棒性更好，且响应迅速。