摘要
模块化多电平变流器(MMC)正常运行时偶数次环流的存在,会增加系统损耗,影响系统的安全运行。针对MMC桥臂电流中的二倍频环流,提出一种自适应准PR控制的方法,并给出相关参数的调整规则;同时对子模块电容电压的扰动进行前馈补偿,以抑制子模块电容电压的扰动所引起的其他偶数次环流。所提出的控制方法无须进行坐标变换和相间解耦,各相只需一个准PR控制器就可以同时抑制MMC中的偶数次环流,结构简单,且能适应负载的变化。仿真和实验结果验证了该控制策略的可行性。
Modular multi-level converter(MMC)in the normal operation of the occasional circulation will increase the system loss and affects the safe operation of the system.In this paper,an adaptive quasi-PR control method is proposed for the doubling loop in the current of MMC bridge arm,and the adjustment rules of relevant parameters are given.At the same time,the sub-module capacitance voltage of the disturbance is feed forward compensated to suppress other even circulation current caused by sub-module capacitor voltage.The control method proposed in this paper does not need coordinate transformation and phase decoupling.Each phase requires only one quasi-PR controller to suppress the even circulation in MMC,and it can adapte the change of load.The simulation and experimental results verify the feasibility of the control strategy.
作者
汪玉凤
王济东
佟丽新
叶青
WANG Yu-feng;WANG Ji-dong;TONG Li-xin;YE Qing(Faculty of Electrical and Engineering Control, Liaoning Technical University, Huludao 125105, China;Fuxin Power Supply Company of Liaoning Electric Power Co. Ltd. , Fuxin 123000, China)
出处
《电工电能新技术》
CSCD
北大核心
2018年第12期24-31,共8页
Advanced Technology of Electrical Engineering and Energy
关键词
模块化多电平变流器
环流
桥臂电流
准PR控制器
modular multilevel converter
circulation
bridge arm current
quasi-PR controller
