Wide-load peak regulation system of straight condensing unit and operation method

The invention discloses a wide-load peak regulation system of a straight condensing unit and an operation method. The wide-load peak regulation system comprises a boiler, a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder, a steam turbine low-pressure cylinder, a generator, a low-pressure heater, a high-pressure heater, a deaerator and a heat storage device, and a steam cylinder smaller than the same capacity is adopted by the steam turbine low-pressure cylinder. The problem about safe operation of small-capacity flow blades is solved, the characteristic of small output of a low-pressure cylinder is utilized, and the minimum technical output of a steam turbine can be reduced to 20%-30% of the rated capacity of the unit when power consumption is low; and the steam turbine high-pressure cylinder and the steam turbine medium-pressure cylinder adopt steam cylinders with the same capacity, the steam inlet pressure is allowed to exceed the rated pressure by 5%, the overload capacity of