摘要
配电网故障时,可以通过多微电网互联供电进行黑启动,恢复重要非故障区域的供电。并网时,微电网群工作在与配网同步的工作模式;配电网故障时,各微电网将分别工作在不同的孤网状态。由于微电网内部的微源特性、负荷特性等存在巨大差异,因而在多微电网互联实现配电网黑启动和非故障区域恢复供电之前,需要对多微电网的互联能力进行分析,以保证多微电网互联后微电网群的安全运行。从多微电网互联后系统的频率稳定和备用容量调节能力角度对多微电网的互联能力进行了分析,提出了相应的互联判据;搭建了仿真模型,对多微电网互联后的动态过程进行验证,结果验证为实现多微电网互联提供理论支撑。
Distribution network under fault condition can be black-started by interconnected power supply among multi microgrids to carry out service restoration for important non-fault area. Under normal grid-connection operation mode the operation of microgrid group is synchronized with the distribution network; during fault in distribution network all microgrids operate in different islanded operation mode. In view of significant differences among micro-source inside microgrids and load characteristics, it is necessary to analyze the interconnectivity of multi microgrids before the black start of distribution network containing multi microgrids and service restoration for non-fault area to ensure the secure operation of microgrid group after the grid-connection of the distribution network. The interconnectivity of multi microgrids is analyzed from the viewpoint of frequency stability and regulation ability of reserve capacity of microgrids after the grid-connection of the distribution network, and corresponding interconnection criteria are given; a simulation model is constructed, by which the dynamic process of multi microgrids after the grid-connection of the distribution network can be validated, and simulation results are available for reference to the implementation of interconnection among multi microgrids.
出处
《电网技术》
EI
CSCD
北大核心
2015年第3期682-689,共8页
Power System Technology
关键词
下垂控制
低频风险
多微网互联
微电网
droop control
low fi＇equency risk
interconnection among multi microgrids
microgrid
