Abstract: This paper proposes a flexible grid-connected control strategy for multi-energy complementary photovoltaic (PV) power plants, aiming at realizing the active support and power balance of the power grid through the coordinated control of multiple energy sources such as PV power generation, energy storage system and gas turbine. The control strategy adopts a hierarchical cooperative control framework, which divides the grid-connection process into three levels: global optimization, regional coordination and equipment execution, and suppresses power fluctuations and improves power quality by dynamically adjusting the output ratio of each energy unit. The results show that the flexible grid-connection control strategy can effectively improve the PV consumption rate, reduce the number of energy storage cycles, and significantly improve the overall operational efficiency and reliability of the power plant. Practical application case analysis shows that the strategy can still maintain the stability of the power grid under extreme weather conditions, showing good adaptability and anti-disturbance ability, which provides a new idea for the intelligent management of PV power plants in the future.