基于切换系统的微电网逆变器双模式控制设计

Design of Dual-mode Control for Microgrid Inverter Based on Switching System

针对微电网并网运行与孤岛运行两种模式的切换稳定性问题,提出将非线性切换系统理论应用到微电网运行模式切换问题上。将并网运行模式和孤岛运行模式看作两个子系统,通过对并网运行模式模型和孤岛运行模式模型增广,来建立微电网切换系统模型。考虑模型存在不确定参数问题,应用自适应Backstepping法分别设计了切换子系统的非线性控制器。同时,构造子系统的共同Lyapunov函数,通过设计合理的切换律,从而保证微电网运行模式切换的稳定性。与传统P/Q控制和V/F控制切换相比,该控制策略有效减小了两种运行模式切换过程中出现的振荡。MATLAB/Simulink仿真结果验证了设计的控制器和切换策略的有效性。

Aiming at the problem of switching stability between microgrid grid-connected operation and island operation,the non-linear switching system theory is applied to solve the problem of microgrid operation mode switching in this paper.The grid-connected operation mode and island operation mode are considered as two subsystems,and the microgrid switching system model is established by expanding the grid-connected operation mode model and island operation mode model.Considering the uncertain parameters in the model,the adaptive backstepping method is used to design the nonlinear controllers of the switching subsystems.At the same time,the common Lyapunov function of the subsystems is constructed,and the reasonable switching law is designed to ensure the stability of the microgrid operation mode switching.Compared with the traditional P/Q control and V/F control switching,the proposed control strategy effectively reduces the oscillations that occur during the switching of the two operation modes.The MATLAB/Simulink simulation results verify the effectiveness of the designed controllers and switching strategy.