微电网中的分布式电源与负荷具有分散性,根据分布式电源特点,应采用不同的控制策略设计控制器.为深入研究微电网的运行特性,首先分析了P/Q控制的有功功率和无功功率恒定输出特性及v/f下垂控制策略在孤岛运行时为微电网提供频率和电压参考的特点.之后,提出根据不同的外界环境(如日照、风速及负荷的变化),利用Matlab/Simulink搭建微电网仿真平台,采用P/Q-V/f控制策略实现在联网运行、孤岛运行以及2种模式之间切换时对微电网的综合控制,并对其运行特性进行仿真分析,结果验证了该控制策略的可行性和正确性.%Distributed generators in a microgrid and their loads have random characteristics.In order to study the operating perfovmancas of a microgrid,controllers with different control strategies are introduced.For instance,the P/Q control is used to realize the constant outputs of the active and reactive power,and the V/f control with droop characteristics is used to give the frequency and voltage references when in island mode.By using the Matlab/Simulink to built the microgrid simulation platform,the P/Q-V/fcontrol strategy is proposed to realize the comprehensive control of a microgrid with the grid-connected and island operation modes,and switching between the two different modes under different external conditions,which will be the changes of sunshine intensity,wind speed and load,and the performances are simulated,which shows that the new control strategy is feasible and correct.
展开▼
