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电网技术  2015 

基于内模控制器的MMC-HVDC稳态控制

DOI: 10.13335/j.1000-3673.pst.2015.08.024, PP. 2223-2229

Keywords: 模块化多电平换流器,高压直流,内模控制,两相静止坐标系

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Abstract:

模块化多电平高压直流输电系统(modularmultilevelconverter-highvoltagedirectcurrent,MMC-HVDC)通常采用基于比例积分(proportionalintegral,PI)的双闭环矢量控制,而PI调节存在响应速度慢、dq电流需要旋转解耦等问题。为此文章提出在两相静止坐标下基于内模控制的MMC-HVDC稳态控制方案。首先分析了两相静止坐标下的MMC-HVDC数学模型,然后结合内模控制的特性,对电流内环的控制结构和参数进行设计,并将内模内环与PI外环结合构造出双闭环控制结构。最后在Matlab/Simulink中搭建了MMC-HVDC系统模型,对多种工况进行仿真。仿真结果表明,所设计的控制器能够有效抑制母线电压波动,并能对负荷变化快速响应,提高了系统的鲁棒性。

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