AC/DC变换器模型预测低频控制策略

Model Predictive Low Frequency Control Strategy of AC/DC Converter

针对传统的模型预测控制(MPC)方法因零矢量的使用而导致共模电压较大、开关频率较高等问题,在弃用零矢量的基础上,提出一种基于AC/DC变换器的模型预测低频控制方法,通过设计指标函数,控制电流快速跟踪并降低平均开关频率实现多目标优化控制。将开关状态变换次数作为最优矢量选择的一个标准,在确保电流控制精度的同时保持开关状态少量变化。该方法可降低功率变换开关损耗、提高整流器的工作效率。实验结果验证了所提方法的有效性和可行性。

In order to solve the problems in the conventional model predictive control(MPC),such as high switching frequency and large common-mode voltage due to the use of zero voltage vectors,a low frequency MPC method of AC/DC converter is proposed on basis of abandoning zero voltage vectors directly.This method can realize fast tracking of the current waveform,as well as reduce the average switching frequency by designing the cost function again.It can achieve multi-objective optimization control as a result of using the new cost function.The number of the switching states transform, which should be minimized at the same time the accuracy of current control is ensured,are used as a criterion for the selection of the optimal voltage vector.This method can reduce the switching loss of power converter and improve the efficiency of the rectifier.Experimental results verify the effectiveness and feasibility of the proposed algorithm.