Research on pre-synchronization control strategy of grid-forming converter based on improved LADRC
To address the problem of grid connection failure caused by low frequency and voltage stability in power system during pre-synchronization process of grid-forming converters,a pre-synchronization control strategy for grid-forming converters based on improved linear active disturbance rejection control(LADRC)is proposed.Firstly,the phase locked loop(PLL)control strategy is used to synchronize the phase and amplitude of the grid voltage with the feedback control of phase deviation,which can avoid the stability problems caused by low precision of the PLL and the slow response speed.On this basis,introducing LADRC in angular frequency output of the active frequency branch module can effectively suppress the frequency oscillation of the system,so as to ensure the normal pre-synchronization process of the grid-forming converter and realize successful grid-connection.Finally,on the MATLAB/Simulink simulation platform,a pre-synchronization control model for grid-forming converters based on improved LADRC is established verified through simulation.The results show that,the proposed strategy can effectively suppress the system frequency oscillations and accelerate the pre-synchronization process of the system,ensuring safe operation of the grid-forming converter and ultimately achieving successful grid connection.The simulation results verify the effectiveness of the proposed method.
国家科技期刊平台
NSTL
万方数据
