新型的MMR电流内环控制策略研究

摘要

针对模块化多电平整流器(MMR)传统双闭环控制策略中电流内环设计复杂及需要复杂的环流抑制算法的问题,提出了一种新的电流内环控制策略.该方法实现简单,且能有效实现子模块电容电压稳定、抑制环流及控制直流母线电压的控制目标.同时推导了系统的传递函数,并基于此得到了电压外环的参数整定方法.通过实验验证了所提电流内环控制策略的有效性.%Aiming at solving the problems of the complexity of current inner loop design and the requirement of complex circulating current restraint method in the traditional double closed loop control strategy of the modular multilevel rectifier(MMR),a novel current inner loop control strategy is proposed.The method is simple in implementation and can effectively realize the control objectives of maintaining the voltage stability of submodule capacitor voltage,restrainting the circulating current and controlling the DC bus voltage.At the same time,the transfer function of the system is derived,on this basis,the method of parameter design for the voltage loop is obtained.The effectiveness of the proposed current inner loop control strategy is verified by experiments.