MMC-UPFC单相接地故障下运行特性分析及整体保护策略设计

doi:10.19595/j.cnki.1000-6753.tces.L80171

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摘要基于模块化多电平换流器的统一潮流控制器（MMC-UPFC）是目前最全面的柔性交流输电系统（FACTS）设备,具有广阔的研究前景。但当线路发生接地或短路故障时,MMC-UPFC串联变换器可能承受过电压和短路电流的冲击而导致烧毁。结合国内外研究现状,为弥补研究空白,该文首先介绍了MMC-UPFC的基本结构,针对交流系统故障,通过分析MMC-UPFC装置在交流母线上发生单相接地故障情况下的运行状态,分析其故障特性,提出定义比例参数k,并合理选择k的值,可以使故障接地电流为0,并能保持故障线路的持续运行。针对站内故障,根据MMC-UPFC本身的拓扑结构特点及并联侧、串联侧不同的交流侧结构,提出将并联侧及串联侧分区进行保护,设计了装置的整体保护配置方案,并研究了与交流系统上其他保护的配合运行,为实际工程提供参考。然后,结合PSCAD软件搭建模型进行仿真分析。最后,以220 kV南京西环网UPFC项目中人工短路实验进行分析,验证所提故障运行特性和保护配置方案的合理性和可行性。

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	陈勇
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Abstract：Theunified power flow controller based on modular multi-level converters is the most flexible ac transmission system device and it has broad market. However, when the single-phase grounding fault occurs on the transmission line, the series converter of MMC-UPFC may be damaged due to the impact of over-voltage and short-circuit current. Combined with the existing researches, in order to make up for the research gap, this paper firstly introduces the topology structure of MMC-UPFC. Then aiming at the fault occurred on the bus line, this paper analyzes the operating condition and fault characteristics under single-phase grounding fault. The proportional parameter k is proposed and if reasonably selecting the value of k, the fault grounding current can be reduced to 0 and the faulty line can operate continuously. Secondly, aiming at the fault occurred inside, according to the structure of MMC-UPFC itself, and the different AC side structures, this paper proposed a protection scheme which is designed separately for the parallel side and series side. This paper also analyzes the coperation with other protection on the bus line. Then the overall protection configuration scheme of the device is designed, which provides a reference for the engineering project. Thirdly, a simulation model is established by using the PSCAD software. Finally, an artificial short-circuit experiment in the 220kV Nanjing west-ring network UPFC project is used for specific analysis to verify the rationality and feasibility of the proposed scheme.

Key words： Single-phase grounding fault unified power flow controller operation characteristics fault characteristics protection scheme artificial short-circuit experiment

收稿日期: 2018-06-28 出版日期: 2019-01-31

PACS:

TM77

基金资助:国家电网公司科技项目资助（5210K017000C）

通讯作者: 王莹,女，1986年生，硕士研究生，工程师，研究方向为电力系统规划。E-mail：wangying@jspdi.com.cn

作者简介: 陈勇, 男,1975年生,硕士研究生,高级工程师,研究方向为电力建设。E-mail：cn_brave@js.sgcc.com.cn

引用本文:

陈勇, 曹伟炜, 柏彬, 王莹, 龚辉. MMC-UPFC单相接地故障下运行特性分析及整体保护策略设计[J]. 电工技术学报, 2019, 34(3): 599-610. Chen Yong, Cao Weiwei, Bai Bin, Wang Ying, Gong Hui. Operation Characteristics Analysis under Single-Phase Grounding Fault and Overall Protection Scheme Design of MMC-UPFC Device. Transactions of China Electrotechnical Society, 2019, 34(3): 599-610.

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