一种基于T型三电平APF的优化无差拍控制

An Optimized Deadbeat Control Based on T-type Three-level Active Power Filters

针对电力电子装置产生的谐波电流注入电网所产生的污染问题,在建立T型三电平有源电力滤波器(APF)数学模型的基础上,提出了一种优化无差拍控制策略;该策略在传统无差拍控制基础上通过增加对输出补偿电流的一步预测,来抵消因数字系统的延时而对补偿效果带来的影响。分别给出了传统无差拍控制和优化无差拍控制两种控制策略相应的数学模型,采用Matlab/Simulink对两种控制策略进行了仿真,仿真结果均表明优化无差拍控制策略具有良好的谐波补偿效果。

For the pollution caused by the harmonic current generated by power electronic devices injected into the power grid,based on the establishment of T-type three-level active power filter(APF)mathematical model,an improved deadbeat control strategy was proposed;on the basis of the strategy in the traditional deadbeat control,a step prediction of output compensation current was added to offset the impact of the digital system for the delay of the compensation effect.The traditional deadbeat control and improved deadbeat control mathematical model of two control strategies were presentsed,Matlab/Simulink was used to simulate the two control strategies.The simulation results show that the improved deadbeat control strategy has good harmonic compensation effect.