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为实现模块化多电平变换器(MMC)作为配电网静止同步补偿器(DSTATCOM)进行无功补偿的目标,同时满足各模块电容电压平衡的要求,可以采取分层控制策略。提出采用多个数字信号处理器(DSP)构成分层控制系统,可以合理分配上层和下层控制器的控制任务,便于扩展模块数量以提高输出电压等级。详细分析了MMC-DSTATCOM控制系统的工作原理及其软、硬件设计,同时给出了上、下层控制器通信和各模块驱动脉冲同步的具体实现方法,在MATLAB/SIMULINK仿真的基础上,搭建了一台三相12模块的MMC-DSTATCOM样机。结果表明,在感性和容性工况下MMC-DSTATCOM均能输出所期望的指令电流,总谐波畸变率较低,无功指令突变时电流响应时间不到0.01 s,动态响应快,电容电压脉动小于5%,验证了分层控制方法正确有效。
In order to achieve the goal of reactive power compensation of the modular multilevel converter (MMC) as the static synchronous compensator (DSTATCOM) of the distribution network and to meet the requirements of capacitor voltage balance of each module, a hierarchical control strategy can be adopted. It is proposed to adopt multiple digital signal processors (DSPs) to form a hierarchical control system, which can rationally allocate the control tasks of the upper and lower controllers and facilitate the expansion of the number of modules to improve the output voltage level. The working principle, software and hardware design of MMC-DSTATCOM control system are analyzed in detail. At the same time, the realization methods of upper and lower controller communication and synchronization of driving pulse of each module are given. Based on MATLAB / SIMULINK simulation, A three-phase 12-module MMC-DSTATCOM prototype. The results show that the MMC-DSTATCOM can output the desired command current under inductive and capacitive conditions, the total harmonic distortion rate is low, the current response time is less than 0.01 s when the reactive command is abrupt, the dynamic response is fast, the capacitance voltage The ripple is less than 5%, which verifies that the stratified control method is correct and effective.