Abstract:Affected by the impedance of the line and the impedance of various transformers, the negative interactions will be often generated between the power grid and the centralized power station, and it may cause a reduction in steady-state performance of the system, which is mainly reflected in the harmonic problem of grid current. Aiming at the problem about harmonic amplification in the transmission process of output current in the centralized photovoltaic power station, and taking the impedance reshaping as the design idea, the grid-side voltage feedforward and output current feedback compensation links is introduced in the control strategy through series and parallel virtual impedance. The simulation results show that the proposed strategy can effectively improve the harmonic problem caused by the influence of various impedance of the system on the output current of centralized photovoltaic power station.