Electric energy converting-switching system and method and application thereof

A technology of electric energy conversion and switching system, which is applied in the direction of single AC network with different frequencies, AC network with the same frequency of different sources, single network parallel feeding arrangement, etc., which can solve the problems of reducing motor life, system flexibility constraints, Issues with greater impact

Pending Publication Date: 2017-06-13
上海申能电力科技有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] However, the existing centralized frequency conversion power supply technology also has certain shortcomings: on the one hand, throttling loss occurs
In order to match the power imbalance between the two, and to meet the power and frequency required by the electric motor of the plant auxiliary machine under the working condition of the main steam turbine generator set, it is necessary to rely on adjusting the opening of the steam inlet regulating valve of the small steam turbine. Help to adjust the operating pressure of the small steam turbine to achieve the purpose of adjusting the speed and output power of the small steam turbine, resulting in throttling loss
[0004] In the second case, due to the design margin of the extraction steam source of the small steam turbine itself, or the adjustment of the operation mode, throttling

Method used

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  • Electric energy converting-switching system and method and application thereof
  • Electric energy converting-switching system and method and application thereof
  • Electric energy converting-switching system and method and application thereof

Examples

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Example Embodiment

[0142] Specific implementation one

[0143] like figure 1 As shown in the figure, a specific embodiment of an electric energy conversion and switching system of the present invention includes No. 1 factory bus 1, No. 2 factory bus 2, a variable frequency generator 4, and a drive variable frequency generator 4 to generate alternating current with variable frequency. The small steam turbine 44, the steam inlet regulating valve 45 for controlling the steam intake of the small steam turbine 44, the industrial frequency power system 8, the electric motors 51 of a plurality of No. 51 factory auxiliary machines, and the frequency and / or voltage, and control the flow of electrical energy between industrial busbars of different frequencies, or a power converter 6 that can control both the electrical energy at different frequencies and the electrical energy to flow between the industrial busbars of the same frequency, the electrical energy converter 6 includes No. 61 connection termin...

Example Embodiment

[0157] Specific embodiment two

[0158] like figure 2 As shown in the figure, another specific embodiment of an electric energy conversion and switching system of the present invention includes No. 1 factory bus 1, No. 2 factory bus 2, a variable frequency generator 4, and a drive variable frequency generator 4. The output frequency can be changed. A small steam turbine 44 of alternating current, a steam inlet regulating valve 45 for controlling the steam intake of the small steam turbine 44, a plurality of electric motors 51 of No. 51 factory auxiliary machines, a motor 251 of No. frequency and / or voltage, and control the flow of electrical energy between utility busbars of different frequencies, or an electrical energy converter that controls both electrical energy at different frequencies and electrical energy flow between utility busbars of the same frequency 6, electrical energy The converter 6 includes a connection terminal 61 and a connection terminal 62 and the like....

Example Embodiment

[0161] Specific embodiment three

[0162] like image 3 As shown in the figure, another specific embodiment of an electric energy conversion and switching system of the present invention includes No. 1 factory bus 1, No. 2 factory bus 2, a variable frequency generator 4, and a drive variable frequency generator 4. The output frequency can be changed. The AC small steam turbine 44, the steam inlet regulating valve 45 for controlling the steam intake of the small steam turbine 44, the industrial frequency power system 8, the motors 51 of a plurality of No. 51 factory auxiliary machines, and the frequency and frequency of at least one connection end can be adjusted. and / or voltage, and control the flow of electrical energy between plant buses of different frequencies, or, a power converter 6 that can control both the flow of electrical energy at different frequencies and the flow of electrical energy between plant buses of the same frequency, power converters 6 includes the 61st...

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Abstract

An electric energy conversion and switching system and method applied to a thermal power plant, through which the frequency and/or voltage of at least one connection terminal can be adjusted, and the electric energy can be controlled to flow between plant buses of different frequencies, or both Controlling electric energy at different frequencies can also control electric energy flowing between plant buses of the same frequency, reduce or even eliminate throttling loss, give full play to the performance of variable frequency generator sets, improve the overall efficiency of the system, thereby reducing energy consumption and creating greater economy At the same time, it improves the method of starting and switching the electric motor of the factory auxiliary machine, and improves the flexibility of the overall operation mode of the system.

Description

technical field [0001] The present invention relates to a switching system and method for electrical energy conversion and plant auxiliary motors applied in thermal power plants, which can control the flow of electric energy between plant buses of different frequencies in thermal power plants, or both can Controlling electric energy at different frequencies can also control the flow of electric energy between plant buses of the same frequency, and can help start and / or switch electric motors of plant auxiliary machines in thermal power plants. Background technique [0002] Energy conservation and emission reduction are not only the external requirements put forward by the state and society for thermal power plants, but also the internal requirements for thermal power plants to reduce costs, increase profits, and fulfill social responsibilities. Therefore, thermal power plants are actively tapping internal potentials and carrying out energy-saving transformation , innovative ...

Claims

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Application Information

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IPC IPC(8): H02J3/02H02J3/06H02J3/46
CPCH02J3/02H02J3/06H02J3/46
Inventor 冯伟忠
Owner 上海申能电力科技有限公司
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