A study of circulating current in MMC based HVDC system under an unbalanced grid condition
A study of circulating current in MMC based HVDC system under an unbalanced grid condition
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电网不平衡条件下MMC直流输电系统环流研究
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Rae
中科院分区：
文献类型：
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作者：
Won;Si;Tae;Rae
研究了基于模块化多电平换流器（MMC）的高压直流输电系统在电网不平衡条件下的环流问题。介绍了MMC直流输电系统的基本结构，并对其进行了系统动力学分析。在此基础上，分别阐述了平衡和不平衡电网条件下环流的建模和控制方法。从环流控制的角度出发，分析了两种功率控制方法，并对它们的性能进行了比较。此外，为了应用功率控制方法，提出并描述了一些实际考虑。在PSIM软件中执行的几个仿真结果验证了在各种电网条件下的功率控制方法的所提出的分析和考虑。
This paper shows a study about circulating current of modular multilevel converter (MMC) based a high voltage direct current (HVDC) system under some unbalanced grid conditions. A basic structure of the MMC HVDC system is introduced and its system dynamics is analyzed. Based on the analysis, the modeling of circulating current and its control method under balanced or unbalanced grid condition are described. From the point of view in circulating current control, two kinds of power control methods are analyzed and their performances compared. In addition, in order to apply the power control methods, some practical considerations are proposed and described. Several simulation results performed in the PSIM software verify the proposed analysis and consideration of the power control methods under various grid conditions.