摘要
含逆变器微源的微网线路故障时,由于逆变器的限流作用,流过逆变器的故障电流被限制在两倍额定电流以内,造成含逆变器微源的微网并、离网模式下故障电流差距较大,使得基于固定值的常规过流保护不适用于微网。基于上述问题,对造成微网线路故障电流不确定性的影响因素作出总结,主要有微网运行方式,DG接入退出、布局容量、控制方式,并对它们的影响作了分析。文中着重综合概括了目前国内外微网线路保护研究热点,并按是否依赖通信及保护原理的实现方法做了划分。最后针对目前微网线路保护存在的问题探讨其可能的发展方向。
The fault current of the inverter is limited to two times of the rated current, which causes the huge differ- ence of the fault current in grid-connected and islanded mode of micro-grid containing inverter type micro source. The conventional over-current protection based on the fixed value is not suitable for the micro network any more. There are many factors that cause the uncertainty of fault current, which are summarized, such as the operation mode of micro- grid, the exit, the capacity, the layout and the control mode of DG, and analyzed their impacts. Current domestic and international research hotspot of micro-grid line protection are summarized, and also makes classifications on whether rely on communications and realization method of protection principle. Finally, it is discussed the possible future de- velopment direction of the micro-grid line protection.
出处
《电测与仪表》
北大核心
2017年第8期52-57,共6页
Electrical Measurement & Instrumentation
基金
国家自然科学基金资助项目(51267019)
关键词
微网
线路保护
逆变器
分布式电源
micro-grid, line protection, inverter, distributed generator
