Parameter design principle of the arm inductor in modular multilevel converter based HVDC
Parameter design principle of the arm inductor in modular multilevel converter based HVDC
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DOI：
10.1109/powercon.2010.5666416
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发表时间：
2010-12
期刊：
影响因子：
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通讯作者：
Qingrui Tu;Zheng Xu;Hongyang Huang;Jing Zhang
中科院分区：
文献类型：
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作者：
Qingrui Tu;Zheng Xu;Hongyang Huang;Jing Zhang
介绍了模块化多电平变流器（MMC）中臂电感的两个独特功能：抑制环流和限制故障电流上升速率。从瞬时功率相等的角度出发，分析了环流的特性，论证了环流以双基频负序流过变换器三相。讨论了环流幅值与臂电感值的关系，提出了设计参数的第一性原则。第二个设计参数的原则是基于故障电流上升率的计算，具有不同的臂电感值。建立了详细的MMC PSCAD/EMTDC模型。稳态仿真证明了双基频环流的存在。仿真结果表明，在不同臂电感参数下，循环电流的计算结果与仿真结果基本一致。对变换器直流端之间的故障进行了研究，结果验证了上述臂电感参数设计原则。
This paper describes two distinctive functions of the arm inductor in the modular multilevel converters (MMC): suppressing the circulating current and limiting the fault current rise rate. Based on the equality of the instantaneous power, the characteristics of the circulating current are analyzed and demonstrated that it flows through the three phase of the converter in negative sequence at double-fundamental frequency. The relationship between the amplitude of the circulating current and the value of the arm inductor is discussed, and the first principle to design the parameters is proposed. The second principle to design the parameters is based on the calculation of the fault current rise rates, with different values of the arm inductors. A detailed PSCAD/EMTDC model of MMC is developed. Steady state simulation proves the existence of the circulating current at double fundamental frequency. Simulation results show a close agreement with the calculation of the circulating current, with different arm inductor parameters. The fault between the DC terminals of the converter is investigated; the results verify the above parameter design principles of the arm inductor.