The invention discloses a comprehensive energy scheduling system for a power grid. The invention belongs to the technical field of power generation and power supply and discloses a pumped storage power station pipeline water hammer damage reduction device. The system comprises a pumped storage power station. The pumped storage power station comprises a reservoir, a water turbine and a pipeline, wherein the two ends of the pipeline are in butt joint with a water outlet of the reservoir and a water inlet of the water turbine respectively and can guide water in the reservoir to the water turbine.The pipeline comprises a first pipe and a second pipe with the diameter larger than that of the first pipe. The lower end of the second pipe is in butt joint with a water turbine water inlet, the upper end of the second pipe is integrally in butt joint with a lower port of the first pipe, and an upper port of the first pipe is in butt joint with a reservoir water outlet. The pumped storage powerstation further comprises a pipeline water hammer damage reduction strategy device, and a first side wall hole is formed in the second pipe.