Efficient peak shaving steam turbine system and working method thereof

The invention discloses an efficient peak shaving steam turbine system and a working method thereof. The system comprises a boiler, a steam turbine high-pressure cylinder, a steam turbine intermediate-pressure cylinder, a steam turbine low-pressure cylinder, a generator, a first high-pressure heater, a second high-pressure heater, a third high-pressure heater and the like. In order to solve the problems that the load rate of a thermal power plant is low, an existing steam turbine is seriously inconsistent with actual operation in design thought and thermal characteristic, and the actual performance is poor, the efficient peak shaving steam turbine is invented. The steam turbine high-pressure cylinder with an efficient wide-load blade profile smaller than the original capacity is manufactured, the through-flow area of a regulating-stage nozzle set is preferentially reduced, and the maximum through-flow capacity of the steam turbine high-pressure cylinder is smaller than that of the steam turbine intermediate-p