基于状态跟随器的微电网平滑切换研究

Research of Microgrid Seamless Switching Based on State Follower

微电网有主从结构和对等控制两种常用结构,运行状态分为并网运行和孤岛运行方式。在微电网运行状态切换时,基于主从控制结构的微电网通常在并网运行时采用PQ控制,孤岛运行时采用V/f控制;基于对等控制结构的微电网通常采用下垂控制。综合考虑主从结构和对等结构的特点,采用了将下垂控制和V/f控制相结合的混合控制策略,并结合改进的电流环控制器结构以及状态跟随器的设计来解决微电网平滑切换的问题。在MATLAB/simulink平台上搭建微电网仿真模型,仿真结果验证了所提控制策略的有效性。

Master-slave and peer-to-peer controls are regarded as common structures in microgrid, containing grid-connected and islanding operation modes. During operation mode switching, microgrid based on master-slave structure adopts PQ control in grid-connected state and V/f control in islangding state respectively. Microgrid based on peer-to-peer control structure usually takes droop control. In this paper, new control strategy mixing droop control and V/f control is proposed, combining improved current loop controller and state follower to solve seamless switching issue of microgrid with consideration of master-slave and peer-to-peer structures. Results verify effectiveness of control strategy raised in this paper with MATLAB/Simulink simulation.