Voltage Control Method of PV Grid-Connected DC Bus based on Tracking Differentiator

In the photovoltaic (PV) grid-connected power generation system, when the output power of the PV panel changes suddenly, the voltage fluctuation amplitude of the bus on the DC side is large. If the control is improper, the normal operation of the system will be directly affected. In order to improve the control performance of bus voltage effectively, this paper proposes a DC bus voltage control method based on tracking differentiator (TD). Compared with the traditional double-closed-loop PI control, this method can improve the dynamic response performance of the system without adding additional sensors and effectively suppress the noise in the signal. In this paper, the traditional PI controller and the PID controller based on tracking differentiator are simulated respectively. Finally, the correctness and effectiveness of the proposed method are verified by simulation.