Thermal power generating unit flexible regulation and control system integrated with steam energy accumulator and working method

The invention discloses a thermal power generating unit flexible regulation and control system integrated with a steam accumulator and a working method. During low-load operation or load reduction of a unit, exhaust steam of a high-pressure cylinder is injected into a medium-pressure steam accumulator for steam storage; exhaust steam of the medium-pressure cylinder is injected into the low-pressure steam accumulator for steam storage, working media of the medium-pressure cylinder and the low-pressure cylinder are reduced by storing the steam, and low-load operation or rapid load reduction of the unit is achieved. When the load of the unit is increased, steam in the medium-pressure steam accumulator is released to serve as heating steam of the high-pressure heater and the deaerator; and steam in the low-pressure steam accumulator is released to serve as heating steam of the first low-pressure heater and the second low-pressure heater, so that steam extraction of the steam turbine is reduced, and rapid load rising of the unit is achieved. By storing and releasing steam of the medium-pressure steam accumulator and the low-pressure steam accumulator, the variable load rate of the unit is increased, the operation range of the coal-fired power generation unit can be widened, ultra-low load operation is achieved, and the power generation efficiency of the coal-fired power generation unit during rapid variable load operation is improved.