Thermal power plant power generator unit with variable-frequency power generator set and steam turbine power generator unit in coaxial arrangement

Abstract

The invention relates to a thermal power plant power generator unit with a variable-frequency power generator unit and a steam turbine power generator unit in coaxial arrangement. The thermal power plant power generator unit comprises the steam turbine power generator unit consisting of a steam turbine and a first power generator, wherein the steam turbine drags the first power generator to rotate at a fixed speed to generate electricity, the thermal power plant power generator unit also comprises the variable-frequency power generator unit consisting of a speed regulation gearbox and a second power generator, the rotating speed of the steam turbine is output to the second power generator after the speed regulation by the speed regulation gearbox, and the electricity is supplied to a variable-frequency plant electricity consumption system through the second power generator. According to the thermal power plant power generator unit, industrial frequency electric energy can be generated by the first power generator to be used for on-line sales, and variable-frequency electric energy can also be generated by the second power generator to be used for self plant electricity consumption; compared with a conventional steam turbine power generator unit, the thermal power plant power generator unit has advantages that the output force of the steam turbine is sufficiently utilized, the operation efficiency of the steam turbine is improved, the electric energy is provided for major power loads in the plant through the second power generator, the integrated frequency conversion of the major power loads in the whole plant is realized, the plant electricity consumption rate is reduced, the electric energy is saved, the on-grid electric quantity is increased, and the power generating income of the power plant is improved.

Description

technical field [0001] The invention relates to the technical field of steam turbine power generation, in particular to a thermal power plant generator set coaxially arranged with a variable frequency generator set and a steam turbine generator set. Background technique [0002] The core equipment of a thermal power plant is a boiler, a steam turbine, and a generator, and the system composed of a steam turbine and a generator is called a steam turbine generator set. The configuration scheme of a conventional steam turbine generator set is that a single steam turbine is coaxially connected with a single generator. The production process of a conventional steam turbine generator set is that the superheated steam generated by the boiler enters the steam turbine through the intake pipe and expands to do work, so that the blades rotate to drive a generator to generate electricity. Water pumps, condensate pumps, feed water heating devices, etc. are sent back to the boiler for rec...

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Problems solved by technology

However, the installation of inverters has the following disadvantages: (1) The loads with energy-saving potential need to install inverters separately, and the installation location depends on the load position, which occupies a large area and is not convenient for centralized management; Dust, temperature, and humidity all have high requirements; (3) The performance of the inverter will gradually decrease and age after long-term operation. If the maintenance is not timely, it will break down, thereby shortening the service life of the equipment. The failure of the frequency converter will cause the load reduction or even shutdown of the unit, which will bring serious economic losses to the power plant

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