﻿ 并网型光伏发电站中性点接地方式分析 Analysis of the Neutral Point Grounding Mode in Grid-Connected Photovoltaic Power Station

Advances in Energy and Power Engineering
Vol.03 No.06(2015), Article ID:16708,5 pages
10.12677/AEPE.2015.36030

Analysis of the Neutral Point Grounding Mode in Grid-Connected Photovoltaic Power Station

Kai Wang

Xinjiang Wind Power Engineering Design & Consultation Co., Ltd., Urumqi Xinjiang

Received: Dec. 5th, 2015; accepted: Dec. 28th, 2015; published: Dec. 31st, 2015

Copyright © 2015 by author and Hans Publishers Inc.

ABSTRACT

Solar energy is a kind of inexhaustibile clean energy. It has sufficient cleanliness, adequacy and potential economic security of absolute and relative breadth, really long life and maintenance-free property, resources etc., and plays an important role in the long-term energy strategy. In this paper, the comparison of different neutral point grounding modes of power network is summarized to select the appropriate neutral point grounding for the photovoltaic power station. Taking a photovoltaic power station as an example, neutral grounding resistor is calculated to offer the values for reference value in the future.

Keywords:Grid Connected Photovoltaic Power Station, Power System, Neutral Point Grounding Mode

1. 引言

2. 并网光伏发电系统

Figure 1. The basic constitute figure of grid connected photovoltaic power station

3. 光伏电站中性点接地方式选择原则

3.1. 中性点接地方式介绍

3.2. 中性点不同接地方式的比较

① 中性点不接地

35 kV配电网单相接地电流超过规定的10 A，就非常容易导致出现不稳定的间歇性接地电弧，致使幅值较高的弧光接地过电压出现。

② 中性点经消弧线圈接地

③ 中性点直接接地

④ 中性点经电阻接地

3.3. 光伏电站中性点接地方式选择原则

① 电气设备和绝缘水平

② 继电保护工作的可靠性

4. 实例计算分析

4.1. 光伏发电站建设方案

1) 光伏电站建设方案

2) 站内电缆线路

35 kV集电线路采用直埋电缆敷设，每10回并联为1回，共计10回汇集线路，引入35 kV配电室，集电线路采用ZR-YJV22-3 × 70 mm2、R-YJV22-3 × 95 mm2、ZR-YJV22-3 × 120 mm2等型号35kV直埋电缆。

4.2. 中性点经小电阻接地计算

1) 单相接地电容电流

2) 中性点小电阻计算

5. 结论

Analysis of the Neutral Point Grounding Mode in Grid-Connected Photovoltaic Power Station[J]. 电力与能源进展, 2015, 03(06): 216-220. http://dx.doi.org/10.12677/AEPE.2015.36030

1. 1. 曹志怀. 并网型太阳能光伏发电系统研究[D]. 成都: 西南交通大学, 2012.

2. 2. 赵杰. 光伏发电并网系统的相关技术研究[D]. 天津: 天津大学, 2012.

3. 3. 赵为. 太阳能光伏并网发电系统的研究[D]. 合肥: 合肥工业大学, 2003.

4. 4. 姜茜. 太阳能发电的发展与展望[J]. 东方电机, 2002(2).

5. 5. 王涛. 变电站10 kV 接地方式的选择[J]. 自动化应用, 2015(2).

6. 6. 马春兰. 大型并网光伏发电系统方案设计探讨[J]. 水电与新能源, 2015(1).