MMC换流器虚拟子模块快速模型预测控制

Virtual Sub-module Fast Model Predictive Control for MMC System

提出一种虚拟子模块快速模型预测控制(VSF-MPC)方法。建立模块化多电平换流器(MMC)系统预测模型,提出期望输出电压预测控制,降低控制器运算负荷与耗时。同时引入虚拟子模块概念,将高优先级拾取的子模块投切方案映射至实际受控系统,以降低开关损耗。实验结果表明,所提VSF-MPC策略可有效缩短MPC策略的运算耗时,简化控制系统结构,并保持良好的动、稳态性能。

A virtual sub-module fast model predictive control（VSF-MPC） strategy is proposed.The predictive model of modular multilevel converter （MMC） system and the theory of desired output voltage control are proposed to rebuild the output voltage, simplify MPC strategy＇s prediction part and reduce the computation load.The concept of virtual sub-module is introduced.The picked up sub-modules＇ switching states in high priority are mapped to the actual con- trolled system to reduce switching loss.Experimental results show that the proposed VSF-MPC strategy can shorten computational time of MPC strategy effectively, simplify the structure of control system and maintain a good dynamic and static performance.