低压微电网平滑切换控制策略研究  

Research on Smooth Switching Control Strategy of Low Voltage Micro-grid

作　　者：危杰[1] 丁宁 熊峰 孙俊晖 WEI Jie;DING Ning;XIONG Feng;SUN Jun-hui(College of Electrical Engineering ＆ New Energy,Three Gorges University,Yichang Hubei 443000,China;State Grid Hubei Electric Power Co.Led Wuhan Power Supply Company,Wuhan 430000,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443000 [2]国电湖北省电力公司武汉供电公司,武汉430000

出　　处：《电力学报》2018年第4期316-321,339,共7页Journal of Electric Power

摘　　要：为了避免微电网并网与孤岛运行模式控制策略的切换,实现微电网并网模式和孤岛模式之间的平滑切换,研究在低压微电网下垂特性的基础上,提出了一种采用外环功率控制和内环电压电流双环控制的三环控制策略,实现并网时基于下垂控制的间接恒功率控制,孤岛时分布式电源自动调节功率输出,并设计了微电网同步并网控制器,有效地减少了微电网过渡过程产生的冲击。仿真结果表明,所提微电网逆变器控制策略运行稳定,运行模式之间能平滑切换。In order to avoid the switching of control strategy between grid-connected micro-grid and isolated island operation mode and achieve the smooth switching between grid-connected mode and island mode of micro-grid,based on the sag characteristics of low-voltage micro-grid,The inner loop voltage and current double loop control tricyclic control strategy,the realization of parallel control based on the droop indirect constant power control,islanding distributed power supply automatically adjusts the power output,and the design of the micro-grid synchronization grid controller,effectively reducing the micro-grid impact of the transition process.The simulation results show that the proposed control strategy of the micro-grid inverters is stable and switching smoothly between operation modes.

关 键 词：低压微电网 同步并网控制器 逆变器 下垂控制 平滑切换 

分 类 号：TM464[电气工程—电器]