基于改进滞环电流控制策略的有源电力滤波器

An Active Power Filter Based on Modified Hysteresis Currents Control Strategy

分析了传统的有源电力滤波器补偿电流跟踪控制技术、固定环宽的滞环电流控制原理及其不足之处、控制系统误差与滞环环宽之间的联系,给出了环宽与系统开关频率、母线电压、主电路电感等参数之间的关系式。对固定环宽的滞环比较控制方法所存在的在电流过零点和顶点处补偿能力的不足的问题,提出了一种变环宽的滞环电流控制方法,该方法能够降低了系统的开关信号频率,提高电流的跟踪控制精度,减小系统的跟踪误差。采用PSIM软件,搭建器件模型进行了仿真实验,并对其开关信号和跟踪误差的结果进行了分析比较,理论分析和仿真实验结果表明了所提出的补偿电流跟踪控制方法的可行性和有效性。

Analysis of the normal compensating currents tracing control technologies of Active Power Filter, disadvantages and principle of fixed-width hysteresis current control, relationships between hysteresis width and error of system are presented. The relationships among hysteresis width, DC-bus voltage, inductances of main circuit are also given. In account of the shortages of hysteresis comparison control mode at zero-crossing and peak, a new hysteresis currents control method is proposed , which lowers the switching frequency, improves the control accuracy and reduces the tracking error. The model and simulation based on PSIM is carried on. contracted analysis is given. The analysis of theory, its switch signals, tracking error results show the feasibility and validity of the control strategy Can be proposed.