Thermal power plant black-start system and method with small hydropower

Abstract

The invention discloses a thermal power plant black start system and method with small hydropower. The system comprises a first hydro-generator, a second hydro-generator, a third hydro-generator, a fourth hydro-generator, a first main transformer, a second main transformer, a first step-down transformer, a second step-down transformer, a first three-winding station transformer, a second three-winding station transformer, a first double-winding station transformer, a second double-winding station transformer, and a 35kV T-connection line; after a thermal power generating unit sending-out line loses power, small hydropower in a thermal power plant is rapidly started, the small hydropower supplies power to one section of bus of a thermal power generating unit auxiliary power system, the othersection of bus is connected with the small hydropower bus and passes through a three-winding transformer for power supply, and the two sections of auxiliary power buses of the thermal power plant recover power supply and rapidly recover power supply to a power loss system. When a sending-out line of the thermal power generating unit operates normally, the small hydropower station can assist the thermal power generating unit to participate in AGC frequency modulation or supply power to a power grid through a T-connection line.

Description

technical field [0001] The invention belongs to the technical field of black start of a thermal power plant with small hydropower, and in particular relates to a black start system and method of a thermal power plant with small hydropower. Background technique [0002] At present, my country's black start is mainly based on hydropower and gas turbines. Thermal power does not have the black start capability due to too many limiting factors. The main reason is that there are many thermal power auxiliary machines, and a large power source is required to drive thermal power auxiliary machines during black start. running, and at the same time the power grid is out of power, after a period of time for the auxiliary equipment of the thermal power unit, the temperature of the boiler and steam turbine gradually transitions to a cold state. Because of its special operating conditions and physical characteristics, thermal power has always been the key technology restricting its black sta...

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Problems solved by technology

[0003] At present, the black start technology of thermal power plants mainly has the following problems: (1) The thermal power plant has no capacity to meet the start-up and controllable small hydropower except for the standby power supply, which restricts its black start capability; Relevant literature and materials of small hydropower auxiliary thermal power plant units; (3) There are no cases and reports of AGC frequency modulation for small hydropower auxiliary thermal power units; Relevant technologies for power supply to realize unit start-up

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