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。
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.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2014年第18期14-19,共6页
Power System Protection and Control
基金
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)~~
关键词
光伏微电网
搜索保护
差动保护
综合保护策略
photovoltaic microgrid
scan protection
differential protection
comprehensive scheme
