微电网运行模式平滑切换控制策略研究

Research on the Smooth Switching Control Strategy of Micro Grid Operation Mode

文章结合典型的风光储微电网,研究了微电网孤岛运行模式与联网运行模式的切换过程,分析了微电网运行模式切换出现暂态振荡的原因,并提出了微电网从孤岛到联网以及从联网到孤岛的平滑切换控制策略。其中,微电网从孤岛到联网切换控制采用基于控制器输出状态同步的策略,联网到孤岛切换控制采用基于控制器d-q旋转坐标同步的方法。实例仿真计算结果验证了所提出控制策略的有效性。

This paper studied the switching process between the isolated operation mode and the networked operation mode of the micro grid,analyzed the causes of the transient oscillation in the switching mode of the micro grid,and put forward the smooth switching control strategy of the micro grid from the isolated island to the connected network and from the connected network to the isolated island.Among them,the control strategy of switching from islands to interconnections was based on synchronization of output states of controllers,and the control strategy of switching from interconnections to islands was based on synchronization of d-q rotating coordinates of controllers.The simulation resulted of an example verify the effectiveness of the proposed control strategy.