Protection novel scheme for flexible DC line based on boundary current

doi:10.19781/j.issn.16739140.2020.01.015

Home > Archive>Volume 35, Issue 1, 2020 >115-121. DOI:10.19781/j.issn.16739140.2020.01.015

Protection novel scheme for flexible DC line based on boundary current
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                        10.19781/j.issn.16739140.2020.01.015
                    
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                        LV ChengLV Cheng
School of Electronic Information and Electrical Engineering，Shanghai Jiao Tong University，Shanghai 200240 ，China
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TAI NenglingTAI Nengling
School of Electronic Information and Electrical Engineering，Shanghai Jiao Tong University，Shanghai 200240 ，China
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ZHENG XiaodongZHENG Xiaodong
School of Electronic Information and Electrical Engineering，Shanghai Jiao Tong University，Shanghai 200240 ，China
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LIU JianLIU Jian
Hangzhou Power Supply Company, State Grid Zhejiang Electric Power Company, Hangzhou 310009 , China
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Abstract:

More and more attentions are paid to the protection strategy for the MMC-HVDC. Due to the difference between the mmchvdc and traditional HVDC, a new flexible DC line protection scheme is proposed based on the boundary current. Firstly, transient characteristics of both ends of current waveforms are analyzed when various types of faults in HVDC lines occur in different positions. It is noticed that the line current in the rectifier is significantly greater than that in the inverter side during the transient process of internal fault. Comparably, there are no significant differences between the two ends of current value at external faults. Secondly, a DC line protection strategy for MMC-HVDC is proposed based on boundary current distance. Finally, the simulation and verification of protection strategy are carried out on the 21level MMC-HVDC system. It is shown that the proposed protection strategy can correctly distinguish the internal fault from the external fault, thus has high reliability.

Key words:waveform difference;modular multilevel converter; boundary current; dc line

Reference

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吕承,邰能灵,郑晓冬,刘剑.基于边界电流的柔性直流线路保护新方案[J].电力科学与技术学报英文版,2020,35(1):115-121. LV Cheng, TAI Nengling, ZHENG Xiaodong, LIU Jian. Protection novel scheme for flexible DC line based on boundary current[J]. Journal of Electric Power Science and Technology,2020,35(1):115-121.

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