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MMC-DSTATCOM控制系统设计与实现

DOI: 10.13336/j.1003-6520.hve.2015.10.034, PP. 3434-3440

Keywords: 模块化多电平变换器,分层控制,电容电压平衡,配电网静止同步补偿器,数字信号处理器,无功补偿

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Abstract:

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0.01s,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。

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