光伏站内用直流微网的接地方式分析

王健; 吴俊勇; 郝亮亮; 张巨瑞; 张皎

引用本文:	王健,吴俊勇,郝亮亮,等.光伏站内用直流微网的接地方式分析[J].电力系统保护与控制,2017,45(15):164-170.
	WANG Jian,WU Junyong,HAO Liangliang,et al.Analysis of grounding mode of DC micro grid in PV station[J].Power System Protection and Control,2017,45(15):164-170

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光伏站内用直流微网的接地方式分析
王健¹,吴俊勇¹,郝亮亮¹,张巨瑞²,张皎³
(1.北京交通大学电气工程学院，北京 100044;2.北京京能清洁能源电力股份有限公司，北京 100028; 3.北京科锐博润电力电子有限公司，北京 100083)

摘要:

接地方式的选择是直流微网设计的关键部分。以北京延庆八达岭31.5 MW光伏电站站内负荷用直流微网为例，对直流微网的接地方式进行了分析。首先，介绍了该直流微网的运行方式、拓扑结构及备选的几种接地方式。然后分别从稳态特性、故障特性以及人身安全三个方面，对不同接地方式进行了深入的理论分析。最后在PSCAD/EMTDC中建立了该直流微网的电磁暂态仿真模型，通过电磁暂态仿真对理论分析进行了验证。研究结果表明:相比于其他接地方式，电源侧通过大电阻接地的IT接地方式更适用于低压直流微网系统。

关键词: 直流微网接地方式双极运行光伏发电直流母线

DOI：10.7667/PSPC161102

分类号:

基金项目:北京市科技计划课题资助(D131104002013003)

Analysis of grounding mode of DC micro grid in PV station

WANG Jian¹,WU Junyong¹,HAO Liangliang¹,ZHANG Jurui²,ZHANG Jiao³

(1. Beijing Jiaotong University, Beijing 100044, China;2. Beijing Jingneng Clean Energy Co., Limited, Beijing 100028, China;3. Beijing Creat-poreen Power Electronics CO., LTD., Beijing 100083, China)

Abstract:

The selection of grounding mode is the key part of DC micro grid design. In this paper, the grounding mode of DC micro grid is analyzed based on the example of Yanqing 31.5 MW Badaling photovoltaic power station. Firstly, this paper introduces the operation mode, topology structure and several grounding methods of DC micro grid. Secondly, different grounding modes are analyzed in theory from the steady-state characteristics, fault characteristics and personal safety aspects. Finally, the simulation model of the DC micro grid is established in PSCAD/EMTDC, and the theoretical analysis is verified by the electromagnetic transient simulation. The results show that, compared with other grounding methods, the power supply side is more suitable for low voltage DC micro grid system through the IT grounding mode with large resistance grounding.

Key words: DC micro grid grounding mode bipolar operation photovoltaic (PV) power generation DC bus

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