Generalized frequency conversion system used for steam turbine generator unit

A frequency conversion system and generator technology, applied in the field of generalized frequency conversion system, can solve the problems of difficult water supply pump speed, high exhaust pressure, poor economy, etc., and achieve the effects of abundant exhaust area, reduced power consumption, and high internal efficiency

Inactive Publication Date: 2016-06-22
冯伟忠
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage is that with the continuous increase of unit capacity, the capacity of the feedwater pump itself is relatively large. If the generator is further driven, the power will be relatively larger. Taking a 1000MW unit as an example, the design power of the feedwater pump is about 38MW, and the speed is generally at 4500~5300rpm, plus the power of the auxiliary engine of the generator, the power of the feedwater pump steam turbine is at least 53MW. However, the current manufacturing process capabi

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  • Generalized frequency conversion system used for steam turbine generator unit
  • Generalized frequency conversion system used for steam turbine generator unit
  • Generalized frequency conversion system used for steam turbine generator unit

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specific Embodiment approach 2

[0042] Such as figure 2 As shown, another specific embodiment of a generalized frequency conversion system for a turbogenerator set according to the present invention includes a steam turbine T, a feedwater pump BFP, a generator G, a speed-up gearbox GB, a clutch system C, and a frequency conversion bus a And power frequency bus b. Auxiliary M 1 ,M 2 ,M 3 ... M n It is connected to the variable frequency bus a through switches 1a, 2a, 3a,..., na, and connected to the power frequency bus b through switches 1b, 2b, 3b..., nb. As the load of the unit changes, adjust (change) the steam parameters and extraction steam entering the steam turbine accordingly, so that the speed of the steam turbine changes accordingly, so that on the one hand, the speed of the feed pump is indirectly changed through the gearbox, and on the other hand, the output of the generator is directly changed. frequency of alternating current. This generator provides frequency conversion power supply for ...

specific Embodiment approach 3

[0045] Such as image 3 As shown, another specific embodiment of the present invention for a generalized frequency conversion system of a steam turbine generator set, which includes a steam turbine T, a feed water pump BFP, a generator G, a speed-up gearbox GB, a double-winding transformer Tr, and a frequency conversion bus a and power frequency bus b. Auxiliary M 1 ,M 2 ,M 3 ... M n It is connected to the variable frequency bus a through switches 1a, 2a, 3a,..., na, and connected to the power frequency bus b through switches 1b, 2b, 3b..., nb. As the load of the unit changes, adjust (change) the steam parameters and extraction steam entering the steam turbine accordingly, so that the speed of the steam turbine changes accordingly, so that on the one hand, the speed of the feed pump is indirectly changed through the gearbox, and on the other hand, the output of the generator is directly changed. frequency of alternating current. This generator provides frequency conversi...

specific Embodiment approach 4

[0048] Such as Figure 4 As shown, another specific embodiment of the present invention for a generalized frequency conversion system of a steam turbine generator set, which includes a steam turbine T, a feed water pump BFP, a generator G, a speed-up gearbox GB, a double-winding transformer Tr, and 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 Connect to frequency conversion bus a through switches 1a, 2a, 3a,..., na, connect to power frequency bus b through switches 1b, 2b, 3b..., nb; auxiliary machine M 1 ’, M 2 ’, M 3 ’…M n ’ is connected to the variable frequency bus c through switches 1c, 2c, 3c,..., nc, and connected to the power frequency bus d through switches 1d, 2d, 3d..., nd. As the load of the unit changes, adjust (change) the steam parameters and extraction steam entering the steam turbine accordingly, so that the speed of the steam turbine changes accordingly, so that...

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Abstract

The invention discloses a generalized frequency conversion system for a steam turbine generator set, which at least includes a steam turbine with adjustable speed, a feed water pump, a generator, a speed-increasing gearbox, a frequency conversion bus and auxiliary machines connected thereto; Change, correspondingly adjust (change) the steam parameters and extraction steam entering the steam turbine, so that the speed of the steam turbine changes accordingly, so that on the one hand, the speed of the feed pump is changed through the speed-increasing gearbox, and on the other hand, the frequency of the alternating current output by the generator is changed. The invention does not need additional frequency converters of other types, and the system is simple, reliable, low in cost and high in efficiency.

Description

technical field [0001] The invention relates to the field of turbogenerators, in particular to a generalized frequency conversion system for turbogenerators. Background technique [0002] During the production process of the power plant, water is heated in the 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 power plants need to consume a lot of electricity. 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 power plants, the capacity of auxiliary machines is generally selected according to the maximum demand plus a certain margin, so the auxiliary machines in actual operation ha...

Claims

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Application Information

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IPC IPC(8): H02P9/04H02P9/06H02P101/20
CPCH02P9/04H02P9/06H02P2101/20
Inventor 冯伟忠
Owner 冯伟忠
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