电阻接地的并网光伏电站零序电流工程实用算法

吴兴全; 吴丽; 李召兄; 李政; 曾燕婷; 卢继平

引用本文:	吴兴全,吴丽,李召兄,等.电阻接地的并网光伏电站零序电流工程实用算法[J].电力系统保护与控制,2018,46(15):120-126.
	WU Xingquan,WU Li,LI Zhaoxiong,et al.An engineering calculation method for zero-sequence current of grid-connected photovoltaic station with neutral grounding resistance[J].Power System Protection and Control,2018,46(15):120-126

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电阻接地的并网光伏电站零序电流工程实用算法
吴兴全¹,吴丽¹,李召兄¹,李政²,曾燕婷²,卢继平²
(1.中国能源建设集团甘肃省电力设计院有限公司, 甘肃兰州730050; 2.重庆大学电气工程学院输配电装备及系统安全与新技术国家重点实验室，重庆 400044)

摘要:

集中式并网光伏电站广泛采用中性点经电阻接地的方式运行，要求在出现接地短路时快速切除故障，研究电阻接地并网光伏电站的零序短路电流计算具有重要意义。为此提出一种中性点经电阻接地的并网光伏电站的零序短路电流工程计算方法。该方法既考虑了并网规定对光伏逆变器低电压穿越的控制要求，同时通过查表的方式可以方便地确定计算公式中各参数的取值，零序电流的求解简单直接。通过一个实际的并网光伏站进行算例验证，结果证明了该方法的实用性和有效性。

关键词: 光伏电站中性点接地电阻低电压穿越零序电流工程算法

DOI：10.7667/PSPC171120

分类号:

基金项目:国家自然科学基金面上项目(51577018);中国能源建设集团甘肃省电力设计院有限公司科技项目资助(G-2015-11-18-01);高等学校学科创新引智计划(“111”计划)资助项目(B08036)

An engineering calculation method for zero-sequence current of grid-connected photovoltaic station with neutral grounding resistance

WU Xingquan¹,WU Li¹,LI Zhaoxiong¹,LI Zheng²,ZENG Yanting²,LU Jiping²

(1. China Energy Engineering Corporation Limited Gansu Electric Power Design Institute, Lanzhou 730050, China;2. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China)

Abstract:

A centralized grid-connected photovoltaic (PV) station is a widely adopted method of neutral grounding using resistance. It requires that the fault can be quickly removed in the event of grounding faults. Therefore, the study of short circuit zero sequence current calculation of grid-connected PV station is of great significance. To this end, an engineering calculation method for zero-sequence current of grid-connected PV station with neutral grounding resistance is proposed. This method takes into account the requirement for grid control of the photovoltaic inverter Low-Voltage Ride Through (LVRT), at the same time, the value of each parameter in the formula can be easily determined by looking up the table, the solution of zero-sequence current is simple and direct. Through an actual PV station for calculation example, and the results verify the practicability and validity of this method. This work is supported by National Natural Science Foundation of China (No. 51577018).

Key words: PV station neutral grounding resistance LVRT zero-sequence current engineering methods

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