Faulty feeder selection and segment location method for SPTG fault in radial MMC‐MVDC distribution grid
Faulty feeder selection and segment location method for SPTG fault in radial MMC‐MVDC distribution grid
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DOI：
10.1049/iet-gtd.2018.6934
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发表时间：
2019-12
期刊：
影响因子：
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通讯作者：
Yu Zeng;G. Zou;Xin Zhang;Xiuyan Wei;Lingtong Jiang;Chenjun Sun
中科院分区：
文献类型：
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作者：
Yu Zeng;G. Zou;Xin Zhang;Xiuyan Wei;Lingtong Jiang;Chenjun Sun
由于基于模块化多电平换流器的中压直流（MMC-MVDC）配电网大多采用小电流接地方式，单极接地（SPTG）故障的微弱故障电流很难检测，特别是在噪声和故障电阻的情况下。因此，本研究提出一种快速、准确的故障馈线选择和分段定位方法。对于SPTG故障，暂态电流故障分量是直流馈线上分布电容的充放电电流。分析表明，故障馈线正负极电流故障分量波形呈负相关；而对于无故障的馈线而言，它们呈正相关。根据这些特点，利用皮尔逊相关系数（PCC）构建了故障馈线选择准则。然后，利用两极当前故障分量之间的能量差，可以验证故障极。另外，通过各段两侧当前故障分量的PCC来定位故障段。最后，仿真结果证实了所提出的故障馈线选择和分段定位方法的有效性。
As a modular multilevel converter-based medium-voltage direct current (MMC-MVDC) distribution grid mostly utilises small current grounding modes, the weak fault current for single-pole-to-ground (SPTG) fault is very difficult to detect especially in the case of noises and fault resistance. Therefore, this study proposes a fast and accurate faulty feeder selection and segment location method. For SPTG fault, the transient current fault component is the charge-discharge current of distributed capacitance on the DC feeder. Analysis indicates that the waveforms of current fault component of positive and negative poles are negatively correlated for a faulty feeder; while they are positively correlated for a non-faulty feeder. According to these characteristics, a faulty feeder selection criterion using Pearson correlation coefficient (PCC) is constructed. Then, utilising the energies difference between the current fault components of two poles, the faulty pole can be verified. In addition, the faulty segment is located by the PCC of the current fault component on both sides of each segment. Finally, simulation results confirm the validity of the proposed faulty feeder selection and segment location method.