Deep peak load regulation and flexible thermal storage system for thermal power plant

The invention provides a deep peak load regulation and flexible thermal storage system for a thermal power plant. The system comprises a high-voltage switch cabinet, a thermal storage water tank, a thermal exchanger, a heating hot water pipeline, a heating return water pipeline, a thermal exchange fan, a variable-frequency speed controller, a low-voltage control cabinet, a PLC, multiple thermal storage water tank temperature sensors and multiple thermal exchanger temperature sensors, wherein the high-voltage switch cabinet is connected with a high-voltage switch in a peak load regulation period of a power grid, the thermal storage water tank is connected with the high-voltage switch cabinet and controlled by a command of the high-voltage switch cabinet, the thermal exchanger is directly connected with the thermal storage water tank through a water pipeline, the heating hot water pipeline and the heating return water pipeline are connected to the thermal exchanger, the thermal exchangefan is connected between