Abstract
The DC bus voltage is often affected by grid voltage fluctuations and load changes when Electric Vehicles(EV) are connected to the grid to charge. Taking the PWM rectifier of EV charging system as the research object, apply the Linear Active Disturbance Rejection Controller(LADRC) to the DC link. In order to optimize the performance of LADRC and improve the disturbance estimation accuracy of the linear extended state observer, this paper proposes a Model-Compensated Linear Active Disturbance Rejection Control(MC-LADRC) strategy. This strategy uses some known disturbances for feedforward compensation, which reduces the observation pressure of Linear Extended State Observer(LESO). Firstly this paper derives the mathematical model of MC-LADRC, and then analyzes the control performance of the strategy in the frequency domain. Finally, the control strategy is applied to the charging system, and the dynamic and steady-state performance of the DC side is simulated and verified.
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