摘要
针对传统比例积分(PI)控制器对于周期性信号跟踪性能较差、补偿精度不高的问题,在电容分裂式三相四线制不对称负载系统中,提出了基于PI控制和重复控制并联的复合控制策略。该策略结合了PI控制对指令响应的快速性和重复控制对周期性信号控制的高精度性的优点,构成了复合控制器,将其应用到有源电力滤波器(APF)电流跟踪环节中。对该策略进行了理论分析、仿真和实验验证,结果表明该设计方法能实现对指令的快速响应,同时提高电流跟踪精度,提高并网电流质量,由此验证了该控制策略的可行性和有效性。
An analysis model is established aiming at the inaccuracy of split-capacitor-type three-phase four-wire sys- tem used in reactive power compensation for unbalanced load and harmonic compensation for rectifier load.The com- posite control strategy based on parallel structure is put forward to solve the poor periodic signal tracking capability and the low compensation accuracy of the traditional proportional integral（PI） controller.The composite control com- bines the PI control strategy, which has speed command response ,with the repetitive control strategy, which has high precision for the periodic signal control, and is applied to track the current of active power filter（APF）.The design of the controller is analyzed in theory and verified by simulation and experiment.Results indicate that the control method can achieve rapid response to instruction signal, improve the accuracy of current tracking and improve the quality of grid current.Both simulation and experimental results verify the feasibility and validity of the proposed control method.
出处
《电力电子技术》
CSCD
北大核心
2016年第5期53-57,共5页
Power Electronics
