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Novel frequency conversion system for thermal power plant

A technology for thermal power plants and frequency conversion systems, applied in control systems, control generators, electrical components, etc., can solve problems such as hindering promotion and high prices, and achieve high internal efficiency, less land occupation, and increased driving power. Effect

Active Publication Date: 2014-08-20
冯伟忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of technology, there are some products that can better solve the above problems, but the high price of these products hinders their further promotion

Method used

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  • Novel frequency conversion system for thermal power plant
  • Novel frequency conversion system for thermal power plant
  • Novel frequency conversion system for thermal power plant

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Effect test

specific Embodiment approach 2

[0036] like figure 2 As shown, another specific embodiment of a new frequency conversion system of the present invention for a thermal power plant includes a steam turbine T, a feed water pump P, a generator G, a transmission gearbox GB, a clutch C, a frequency conversion bus a and a power frequency Busbar b. Auxiliary M 1 ,M 2 ,M 3 ... M n It is connected to the frequency conversion bus a through the switches 1a, 2a, 3a,..., na, and connected to the power frequency bus b through the switches 1b, 2b, 3b..., nb. As the unit load changes, the steam extraction volume and parameters entering the steam turbine will change accordingly, and the speed of the steam turbine will change synchronously, thereby changing the speed of the feed water pump on the one hand, and changing the frequency of the alternating current output by the generator on the other hand. This generator provides frequency conversion power supply for all auxiliary machines connected to the frequency conversio...

specific Embodiment approach 3

[0039] like image 3 As shown, another specific embodiment of a novel frequency conversion system for a thermal power plant of the present invention includes a steam turbine T, a feed water pump P, a generator G, a variable speed gearbox GB, a double-winding transformer Tr, a frequency conversion bus a and Power frequency bus b. Auxiliary M 1 ,M 2 ,M 3 ... M n It is connected to the frequency conversion bus a through the switches 1a, 2a, 3a,..., na, and connected to the power frequency bus b through the switches 1b, 2b, 3b..., nb. As the unit load changes, the steam extraction volume and parameters entering the steam turbine will change accordingly, and the speed of the steam turbine will change synchronously, thereby changing the speed of the feed water pump on the one hand, and changing the frequency of the alternating current output by the generator on the other hand. This generator provides frequency conversion power supply for all auxiliary machines connected to the ...

specific Embodiment approach 4

[0042] like Figure 4 As shown, another specific embodiment of a novel frequency conversion system used in a thermal power plant of the present invention includes a steam turbine T, a feed water pump P, a generator G, a variable speed gearbox GB, a double-winding transformer Tr, a frequency conversion bus a, Power frequency bus b, frequency conversion bus c, power frequency bus d. Auxiliary M 1 ,M 2 ,M 3 ... M n It is connected to the frequency conversion bus a through switches 1a, 2a, 3a,..., na, and connected to the power frequency bus b through switches 1b, 2b, 3b..., nb; the auxiliary machine M 1 ’, M 2 ’, M 3 ’…M n ’ is connected to the frequency conversion bus c through switches 1c, 2c, 3c,..., nc, and connected to the power frequency bus d through switches 1d, 2d, 3d..., nd. As the unit load changes, the steam extraction volume and parameters entering the steam turbine will change accordingly, and the speed of the steam turbine will change synchronously, thereby...

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Abstract

The invention discloses a novel frequency conversion system for a thermal power plant. The novel frequency conversion system at least comprises a turbine, a feed pump, a generator, a speed change gearbox, a frequency conversion bus and an auxiliary machine connected with the frequency conversion bus, wherein the rotating speed of the turbine can be adjusted. The steam extraction capacity entering the turbine and parameters are changed correspondingly along with the variation of unit loads. The rotating speed of the turbine synchronously changes, and therefore the rotating speed of the feed pump is changed on one hand, and the frequency of alternating currents output by the generator is changed on the other hand. Frequency converters of other types do not need to be additionally arranged, the system is simple, relevant problems brought by using the frequency converters of other types are solved, reliability is high, and occupied land is small.

Description

technical field [0001] The invention relates to a novel frequency conversion system, in particular to a novel frequency conversion system used in thermal power plants. Background technique [0002] In the production process of a thermal power plant, water is heated in a boiler and turned into steam, and then the steam is used to drive the steam turbine to rotate, which drives the generator to rotate, and finally converts the chemical energy of the fuel into electrical energy. In the process of power generation, a large number of rotating auxiliary machines such as pumps and fans in thermal power plants need to consume a large amount of electric energy. The current general practice is to draw a part of the generated electricity through the plant transformer for use by the plant auxiliary machine. [0003] In the engineering design of thermal power plants, the capacity of auxiliary machines is generally selected according to the maximum demand plus a certain margin, so the au...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/04
CPCH02P9/04H02P27/04
Inventor 冯伟忠
Owner 冯伟忠
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