使用电压-相角下垂控制的微电网控制策略设计

Design of Microgrid Control Strategy Using Voltage Amplitude and Phase Angle Droop Control

根据微电网的特点,对微电网2种运行模式采取的不同控制策略进行设计。微电网孤岛运行时,分布式发电单元采用电压源逆变器控制,使用电压—相角下垂控制实现按预定比例分配负荷功率,该下垂控制较电压—频率下垂控制可以提供更好的频率支撑。微电网并网运行时,分布式发电单元采用PQ控制,按照功率设定值输出功率。通过设计对应电压—相角下垂控制的同步控制器实现了微电网运行模式的无缝转换。利用MATLAB/Simulink对微电网运行模式转换和微电网孤岛运行时使用的2种下垂控制进行对比仿真分析,验证了电压—相角下垂控制策略的可行性和有效性。

Based on microgrid features,different control strategies are designed for two operation modes of microgrid.When the microgrid is on isolated island operation mode,distributed generation units adopt voltage source inverter control,using voltage amplitude and phase angle droop control to share load power according to predetermined proportion.This droop control can provide better frequency support than voltage amplitude and frequency droop control.When the microgrid is on grid-connected operation mode,distributed generation units adopt PQ control so as to output power according to given values.Microgrid operation modes can achieve seamless transition by using synchronization controller corresponding to voltage amplitude and phase angle droop control.Microgrid transition between operation modes and comparison between two kinds of droop control when microgrid operates on isolated island operation mode are analyzed.MATLAB/Simulink simulation shows that voltage amplitude and phase angle droop control strategy is feasible and effective.