基于MMC的分布式潮流控制器控制策略

Control Strategy of DPFC Based on Modular Multilevel Converters

为响应电力系统高压大功率的发展趋势,将模块化多电平换流器引入到分布式潮流控制器,并提出了一种基于模块化多电平换流器的分布式潮流控制器控制方法,其中并联侧基于模块化多电平拓扑结构的三相换流器应用了前馈解耦控制以及最近电平逼近调制策略,而并联侧单相换流器则提出利用三次谐波作为能量传输通道,为串联侧变流器电容充电提供能量。串联侧的单相换流器采用了dq解耦和PWM控制。在PSCAD/EMTDC中建立了基于21电平模块化多电平换流器的分布式潮流控制器系统,仿真结果表明了控制策略的可行性。

In order to respond to the development trend of high voltage and high-power, a modular multilevel converter is introduced into the distributed power flow controller, and a control method of distributed power flow controller which based on modular multilevel converter is put forward, the feed forward decoupling control and the nearest level modulation strategy are applied to the three-phase converter based on the modular multilevel topology, the parallel side singlephase converter is proposed to use the three harmonic as the energy transmission channel, which provides the energy for capacitor charging that in the series side converter. DQ decoupling control and PWM control are applied to the single-phase converter in the series side. A distributed power flow controller that based on 21 level modular multilevel converter is established in PSCAD/EMTDC, the simulation results show the feasibility of the control strategy.