基于主从控制的微电网平滑切换控制策略研究

Study on control strategy of smooth switching for micro-grid based on master-slave control

微电网在并网与孤岛运行模式下控制策略和控制结构存在差异,当微电网切换时,由于两种模式下控制器的状态不匹配,控制器的输出会发生跳变,产生较大的暂态震荡。因此针对主从控制结构的微电网在并网模式与孤岛模式两种模式下的控制和相互切换,提出了一种将PQ控制和基于改进下垂的V/f控制相结合,通过下垂系数自适应调节和控制器输出状态同步控制,实现微电网平滑切换的综合控制策略。在Matlab/Simulink中建立微电网模型进行仿真分析,仿真结果验证了该控制策略的可行性和有效性,实现了微电网的平滑切换,有效降低了系统切换过程中产生的暂态震荡。

Mode control strategy and control structure of micro-grid in grid connected and islanded operation are different,when the micro-grid switches,due to the controller status does not match in two modes,the output of the controller will jump and produce larger transient shock. Therefore,according to the master-slave control structure of micro-grid in grid connected mode and island mode and mutual switch,this paper presents a method of PQ control and based on improved droop of the V / F control combination,by adjusting the adaptive droop coefficient and the output of the controller state synchronization control for micro-grid smooth switching control strategy. The micro-grid model is built in Matlab / Simulink to be simulated and analyzed. The simulation results verify the feasibility and effectiveness of the proposed control strategy,which realize the micro-grid smooth switching,reduce the transient shock produced in the process of switching system effectively.