A Three-Level Hierarchical Power Smoothing Control Strategy for Pavement Photovoltaics Under Vehicle Shadow Disturbance

In this paper, a three-level hierarchical power smoothing control strategy is proposed for optimizing the pavement photovoltaic (PV) power fluctuation under vehicle shadowing disturbance. By applying the virtual impedance current-voltage (I-V) droop control strategy to the inverter control link and impedance shaping the inverter branch and hybrid energy storage branch, a three-level crossover mechanism is constructed to achieve automatic crossover absorption of pavement PV power fluctuations and smooth control. Finally, the effectiveness of the proposed strategy is verified through simulation and experiment, and the influence of virtual impedance parameters on the system crossover mechanism is analyzed. The experimental results show that the proposed control strategy reduces the total harmonic distortion (THD) of the system output current from 17.09% to 8.23%, which greatly improves the power quality of the output power. The feasibility of the control strategy is verified in the scenario of indoor pavement PV system.