| 引用本文: | 王志文,陈来军,郑天文,等.采用搜索保护与差动保护的光伏微电网综合保护策略[J].电力系统保护与控制,2014,42(18):14-19.[点击复制] |
| WANG Zhi-wen,CHEN Lai-jun,ZHENG Tian-wen,et al.A comprehensive protection scheme for photovoltaic microgridusing scan protection and differential protection[J].Power System Protection and Control,2014,42(18):14-19[点击复制] |
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| 摘要: |
| 光伏微电网具有短路电流小、潮流双向流动、运行工况多变等特点，容易导致继电保护的拒动与误动。提出了基于电压启动、搜索最大电流正序故障分量的检测方法，并将其与传统差动保护方法相结合，设计了光伏微电网综合保护策略。该保护策略不依赖短路电流幅值启动，不需要整定继电保护电流阈值，适用于微电网并网和离网模式。此外，该策略在通信故障、主保护拒动等工况下依然有效。在PSCAD环境中构建了典型的光伏微电网算例，通过典型工况全面验证了综合保护策略的有效性。 |
| 关键词: 光伏微电网 搜索保护 差动保护 综合保护策略 |
| DOI： |
| 投稿时间：2014-02-20 |
| 基金项目:国家自然科学基金创新群体项目(51322005)；国家863高技术基金项目（2012AA050204） |
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| A comprehensive protection scheme for photovoltaic microgridusing scan protection and differential protection |
| WANG Zhi-wen,CHEN Lai-jun,ZHENG Tian-wen,SHEN Chen |
| (State Key Lab of Control and Simulation of Power Systems and Generation Equipment, Dep of Electrical Engineering,
Tsinghua University, Beijing 100084, China) |
| Abstract: |
| Limited short-current, bi-directional power flow and variable operating modes in microgrids make for relay’s malfunction and false tripping. A fault detection method which starts by voltage dip and scans the largest positive-sequence fault component is explored. A comprehensive scheme using the method and differential protection is proposed for radial microgrid. The scheme is independent of amplitude of short-current, without setting current threshold, working well in both paralleled and islanded modes. Even coming across failure of communication, the scheme is still effective. Simulations in PSCAD verifies the proposed scheme. |
| Key words: photovoltaic microgrid scan protection differential protection comprehensive scheme |
