摘要
阐述了含有2个微电源的微电网在并网与孤岛模式运行下有功功率和无功功率分配问题.在电网中通过加入1个电压-无功功率下垂特性来改进电压控制的性能,通过有功功率-频率下垂特性改变,DR可由并网模式转为孤岛模式.此时,并不是直接控制DR的输出功率,而是由功率-频率下垂特性来决定输出值,使得2个DR都输入足够的功率来供给微电网中所有的负载.仿真结果表明,通过对控制器参数的设置,所设计的控制器能够使微电网在并网和独立模式运行时的有功功率和无功功率得到合理分配.
A micro-grid with two distributed resources is introduced.The characteristic of the system that enables the active and reactive power sharing for parallel and island operation is investigated.In the power network,the performance of the voltage control can be improved by adding a voltage-reactive power droop characteristic.A cluster of DR can be transferred from a grid-supplied environment to the island by implementing a frequency-active power droop.At this point,the output power of the DR is not being controlled directly.This output value is determined by the power-frequency droop,ensuring that both units are injecting enough power to supply all the loads in the micro-grid.Both the simulation and experimental results verify that the designed controllers are capable of active and reactive power reasonable sharing in connected-grid and standalone modes by adapting to different controller settings.
出处
《华北水利水电学院学报》
2013年第2期83-86,共4页
North China Institute of Water Conservancy and Hydroelectric Power
基金
国家电网公司项目(2010GW1046)
关键词
微电源
微电网
功率分配
distributed resource
micro-grid
power sharing
