Short‐circuit current calculation and performance requirement of HVDC breakers for MMC‐MTDC systems
Short‐circuit current calculation and performance requirement of HVDC breakers for MMC‐MTDC systems
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DOI：
10.1002/tee.22203
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发表时间：
2016-03
影响因子：
1
通讯作者：
Zheren Zhang;Zheng Xu
中科院分区：
文献类型：
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作者：
Zheren Zhang;Zheng Xu
为了评估高效模块化多电平变换器(MMC) -多端高压直流（MTDC）系统对高压直流（HVDC）断路器的性能要求，本文提出了计算最大短路电流的等效模型。首先，根据短路电流的物理动力学特性，将其分解为稳态分量和故障分量。其次，通过求解直流（DC）网络确定稳态分量；故障分量由等效网络计算，其中变换器由串联的电抗、电阻和电容代替。然后，描述了基于短路电流计算的高压直流断路器性能要求评估的完整过程。基于三端800 MW/±400 kV双极MMC - MTDC系统进行了验证。结果表明，该方法是有效的。最后，在同一系统的基础上，用所提出的方法研究了直流断路器的性能要求以及子模块（SM）电容和平滑电抗器的影响。©2015日本电气工程师学会。约翰·威利父子出版公司。
To evaluate the performance requirement of high‐voltage direct current (HVDC) breakers for modular multilevel converter (MMC)‐MTDC (multi‐terminal high voltage direct current) systems with high efficiency, the equivalent model for calculating the maximum short‐circuit current is presented in this paper. First, the short‐circuit current is decomposed into the steady‐state component and the fault component according to its physical dynamics. Second, the steady‐state component is determined by solving the direct current (DC) network; the fault component is calculated by an equivalent network in which the converters are replaced by a reactance, a resistance, and a capacitance in series. Then, the complete procedure for evaluating the performance requirement of HVDC breakers is described based on short‐circuit current calculation. Verifications have been carried out based on a three‐terminal 800 MW/±400 kV bipolar MMC‐MTDC system. The results show that the proposed methodology is efficient and effective. Lastly, based on the same system, the performance requirement of HVDC breakers and the influence by the sub‐module (SM) capacitance and the smoothing reactor have been studied with the proposed methodology. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.