摘要
考虑到微电网内分布式电源和负荷所具有的分散性,根据分布式电源的类型以及与储能装置的不同组合方式,采用不同的控制策略分别进行了相应控制器的设计.基于下垂特性的Droop控制可实现负荷功率变化时不同分布式电源间变化功率的共享,而电压/频率(V/f)控制和Droop控制均可在微电网孤岛运行时为微电网系统提供频率支撑;PQ控制可根据实际运行情况实现分布式电源有功和无功功率的指定控制.根据不同电源特性针对性地采用不同控制技术组合,并对微电网孤岛运行模式和并网运行模式之间切换的运行特性进行分析,获得了微电网中相应分布式电源的功率、电压、电流及系统频率的变化规律,证明了PQ-V/f以及PQ-Droop综合控制策略的正确性和有效性.
In view of the dispersion of distributed generators a,M loads in micr.-grids, com.sponding controllers are designed by adopting different control stralegies based on the types of distributcd gcneralors and different combinations of energy storage devices. Droop control technology based on droop eh;i,m：tcristics can be applied to make power shared among different distributed generators when load power varies. V/F control and l）roop control are able to provide frequency stq^port for micro-grid system ~d^en miero-gn＇ids are. islanding, l）ift^renl c^mh＇ol technologies are combined according to dit]~rent power features. Moreover, this paper sludies the workiug eharacteristics during switches between micro-grid islanding mode and grid connecting mode. The corresponding power, voltage, era＇rent of＂ distribuled generators in micro- grids and the change law of power system frequency are obtained. The study proves that PQ-V/f PQ-Droop integrated control strategy is valid and effecti＇~e.
出处
《南京工程学院学报（自然科学版）》
2012年第3期16-22,共7页
Journal of Nanjing Institute of Technology(Natural Science Edition)
基金
江苏省高校自然科学基金(11KJB470007)
南京工程学院大学生科技创新基金(N20100405)
