微电网的并离网平滑切换控制策略研究

Control strategy for smooth switching between island operation mode and grid-connection operation mode of microgrid

针对光储微电网并离网切换过程中的平滑过渡问题,提出了一种适用于主从控制与对等控制相结合条件下的控制策略,通过离网过程中对电压相位进行积分控制,并网过程中对电压的相位和幅值进行无差调节控制,实现并离网切换过程的平滑过渡,提高电能质量,保证微电网系统中重要负荷的正常稳定运行。文章通过在Matlab/Simulink平台下搭建光储微电网仿真模型,对所提出的控制策略的有效性和可行性进行了验证。

In allusion to the problem of smooth transition between island operation mode and grid-connection operation mode of photovohaic and energy-storage hybrid microgrid, a control strategy is proposed, which is suitable for the combination of master and slave control and peer to peer control,namely from voltage phase integral control in the off-grid process and make no difference adjustment control to the grid voltage phase and amplitude in the process of grid- connection, so as to realize the smooth transition of the switching process ,improve the micro grid power quality and ensure the normal and stable operation of the important loads in the microgrid system. The effectiveness and feasibility of the proposed control strategy are verified by using the simulation model of optical storage and micro grid in Matlab/Simulink platform.