Abstract：In the high voltage direct current transmission based on modular multilevel converter (MMC) system, identifying line faults efficiently and reliably was one of the important guarantees for the safe and economic operation of the system. In order to identify line faults quickly and reliably, an internal and external fault identification method based on sequential overlapping derivative(SOD) transform was proposed. This paper first analyzes the physical boundary formed by the MMC equivalent impedance model, which has a strong attenuation effect on high frequency components, the start voltage caused by the line fault changes steeply when amplitude is large and the time-domin waveform isshowen shaking violently;the the start voltage caused by the external fault changes gently and amplitude is small. Secondly, the SOD transformation is used to transform the fault voltage and current. The converted voltage and current signal are multiplied to obtain SP, and K is defined as the maximum value of the absolute value of SP, and the internal and external faults are determined according to the K value. The MMC-HVDC system simulation model is built on PSCAD/EMTDC. The simulation results show that the method , which has good quick action, certain resistance to transition resistance and strong applicability ,can reliably and accurately identify internal faults and external faults.
束洪春, 代月, 安娜, 田鑫萃, 王广雪. 基于交叉重叠差分变换的MMC-HVDC线路故障识别方法[J]. 电工技术学报, 2021, 36(1): 203-214.
Shu Hongchun, Dai Yue, An Na, Tian Xincui, Wang Guangxue. Fault Identification Method of MMC-HVDC Line Based on Sequential Overlapping Derivative Transform. Transactions of China Electrotechnical Society, 2021, 36(1): 203-214.
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2021, Vol. 36 
