预定义时间非线性扰动观测器驱动的混合储能系统无源控制策略OA

Aimed at the problems of slow dynamic response and DC bus voltage deviation when the constant power load of a DC microgrid hybrid energy storage system(HESS)changes abruptly,a fusion strategy of a predefined time nonlin⁃ear disturbance observer and passive control is proposed in this paper.First,the predefined time nonlinear disturbance observer is designed to achieve accurate online estimation of time-varying input voltage and abrupt load,in which the predefined time convergence mechanism can flexibly control the convergence speed through parameter adjustment.Second,a passivity-based voltage control loop is designed,and the global stability is derived based on the Lyapunov theory,so as to effectively suppress the load disturbance while improving the voltage regulation accuracy.The designed observer and loop are deeply integrated,i.e.,the disturbance observer feedforward compensation is used to enhance the robustness,and the dynamic response is optimized by energy shaping.Experimental results show that compared with the traditional sliding mode control and passivity-based control,the proposed strategy can improve the dynamic re⁃sponse speed by more than 50％ and reduce the voltage fluctuation by 60％,and it is still stable under high power switching,providing a new idea for the efficient control of HESS under complex working conditions.