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提高扰动下VSC-HVDC供电电压质量的逆变站控制方法

, PP. 112-119

Keywords: 交流电压控制,电压质量,非线性补偿,柔性直流输电

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Abstract:

无源网络由VSC-HVDC供电时,由于逆变站的输出电抗较大使得受端系统扰动下易遭受电压跌落和电压浪涌问题。为提高VSC-HVDC向无源网络供电的电压质量,本文提出一种高动态性能的逆变站电压控制方法。首先基于逆变站的数学模型针对负载电流对电压的影响设计了前馈补偿器,并进一步讨论了逆变器非线性特性对前馈补偿性能的影响,进而在dq坐标下提出逆变器的非线性补偿方法。此外,为了克服前馈补偿的参数敏感特性,引入了PI反馈控制。利用PSCAD/EMTDC的软件在几类系统扰动下对提出的控制方法与直接电压控制方法、传统的前馈补偿方法进行了仿真比较。结果表明,提出控制方法能有效提高扰动下VSC-HVDC供电的电压质量。

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