基于模型预测控制的级联式模块化多电平换流器控制策略

Cascaded Modular Multilevel Converter Control Strategy Based on Model Predictive Control

针对传统的模块化多电平换流器控制策略过于依赖控制器参数整定,以及传统的模型预测控制中存在权重因子选取困难等问题,提出一种基于模型预测控制的模块化多电平换流器多目标级联式控制策略,对多个控制目标逐级独立优化实现输出电流控制、桥臂环流控制以及子模块均压控制。控制策略在避免权重因子选取的同时还兼顾良好的控制效果。在MATLAB/Simulink中搭建仿真模型,验证了所提策略的有效性。

Aiming at the problems that the traditional control strategy of modular multi-level converter relies too much on controller parameter setting and the difficulty of selecting weight factors in traditional model predictive control,a modular multi-level converter based on model predictive control was proposed.The multi-objective cascade control strategy of the controller was adopted,and the output current control,bridge arm loop current control and sub-module voltage equalization control were independently optimized step by step for multiple control objectives.The control strategy not only avoided the selection of weight factors,but also took into account a good control effect.A simulation model was built in MATLAB/Simulink to verify the effectiveness of the proposed strategy.