Research on Linear Active Disturbance Rejection Control Strategy of Single-phase Inverter Constant Current Source

Abstract:
In order to solve the problem of poor output current quality of high-power constant current inverter under external disturbance, the linear active disturbance rejection control strategy is applied to the current control of single-phase fullbridge inverter current source. Firstly, the main topology structure of the full-bridge inverter constant current source is analyzed, the mathematical model is established in the synchronous rotating coordinate system, the active disturbance rejection control parameters of the current source are designed, and the anti-disturbance capability to the load and filter parameter changes and external unknown disturbances is analyzed. Then, the simulation experiment of constant current source is built in Matlab/simulink. After simulation comparison, the linear active disturbance rejection control strategy has better output current waveform quality and stronger system robustness than traditional PI control.