Additional Self-disturbance Rejection Control Strategy for Battery Storage in VSG-based Wind Power Grid-connected System
In order to enhance the ability of doubly fed wind power grid connected systems to suppress low-frequency oscillations,a battery energy storage additional self-disturbance rejection damping control strategy based on virtual synchronous generator control was proposed.Firstly,based on the complex torque coefficient method,the principle of adding self-disturbance rejection control to enhance system damping in battery energy storage was elucidated;then,taking the active power reference value of the virtual synchronous generator active control link in the energy storage inverter as the input and the angular velocity deviation of the synchronous generator as the output,the open-loop transfer function between the two time-domain signals was obtained through system identification method;on this basis,the angular velocity deviation of the synchronous generator was taken as the input signal of the controller,and self-disturbance rejection damping control was added to the virtual synchronous generator active link of the energy storage inverter;then,the particle swarm optimization algorithm was used to adjust the damping controller parameters;finally,the effectiveness of the damping control strategy in suppressing low-frequency oscillations was verified through time-domain simulation.The simulation shows that it is possible to timely reduce the time for system power oscillation decaying to zero and reduce overshoot,enhancing the damping of large-scale wind power grid connected systems.
万方数据
维普
