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.