含光伏源的微电网孤岛/联网平滑切换控制策略

A Control Strategy for Smooth Switching Between Island Operation Mode and Grid-Connection Operation Mode of Microgrid Containing Photovoltaic Generations

以含光伏源的微电网为研究对象,针对微电网孤岛运行模式与联网运行模式的切换以及微电网在不同运行模式下不同控制策略之间的切换,提出了一种基于PQ控制器初始输出状态对V/f控制器输出状态同步跟随的平滑切换方法,改进了传统的预同步控制器,最后分析了在给定参数下电压电流双环控制系统的性能和输出阻抗。仿真结果验证了所提控制策略的有效性。

Taking the （PV） generations as the microgrid containing photovoltaic research object, in allusion to the switching between isolated island operation mode and grid-connection operation mode ofmicrogrid and the switching among different control strategies of mierogrid under different microgrid operation modes a smooth switching strategy based on the synchronous tracking of initial output situation of PQ controller to output situation of V/f controller is proposed to meliorate traditional pre-synchronous controller is proposed; finally the performance and output impedance of voltage-current double loop controller under specified parameters are analyzed. The effectiveness of the proposed control strategy is validated by simulation results.