Abstract: Due to the fact that the traditional distributed photovoltaic grid-connected voltage regulation control method does not fully consider the communication frequency and the number of iterations in the experimental improved consistency algorithm, resulting in the slow voltage change speed and unstable operating voltage during the photovoltaic grid-connected voltage regulation control work, and the photovoltaic grid-connected voltage regulation control work cannot be implemented efficiently and stably. By analyzing the dynamic regulation power voltage curve of photovoltaic grid-connected, the offset of large-scale distributed photovoltaic grid-connected voltage was evaluated. By simplifying the complex branch model, a distributed photovoltaic grid-connected model is constructed according to the relationship between output current and voltage. Parameters such as communication frequency and iteration times were adjusted, and the nonlinear function relationship between grid voltage and PV grid-connected points was introduced to improve the consistency algorithm model. Based on the results of voltage sensitivity analysis and cluster division, a unified large-scale distributed photovoltaic grid-connected voltage regulation control strategy is formulated and implemented. Experiments show that the proposed method has a fast voltage change speed and a stable operating voltage when the on-load voltage regulator transformer is controlled, and the expected value of the voltage deviation function reaches the optimal expected value after the 50th iteration.