Low-voltage power supply switching method considering idling characteristic of electric motor group for thermal power plant

A technology of motor group and low-voltage power supply, which is applied in the direction of emergency power supply arrangements, electrical components, circuit devices, etc., can solve problems such as lack of solutions, and achieve the effect of improving competitiveness

Active Publication Date: 2017-08-08
SHANDONG ELECTRIC POWER ENG CONSULTING INST CORP
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  • Application Information

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Problems solved by technology

[0006] In summary, in the prior art, there is still no effective solution to the problem of non-stop switching of low-voltage power supplies in thermal power plants

Method used

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  • Low-voltage power supply switching method considering idling characteristic of electric motor group for thermal power plant
  • Low-voltage power supply switching method considering idling characteristic of electric motor group for thermal power plant
  • Low-voltage power supply switching method considering idling characteristic of electric motor group for thermal power plant

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Embodiment Construction

[0031] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0032] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0033] As introduced in the background technology, there is a problem of non-stop switching of low-voltage power...

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Abstract

The invention discloses a low-voltage power supply switching method considering idling characteristic of an electric motor group for a thermal power plant. The low-voltage power supply switching method comprises the steps of simulating idling characteristic of a low-voltage electric motor group; selecting a switching principle for uninterruptible power switching with regard to each pair of transformers; allowing uninterruptible power switching time of a low-voltage power supply and switching time of thermal control DCS dual auxiliary machines to be matched with regard to each pair of transformers; determining matching of uninterruptible power switching of the low-voltage power supply and low-voltage ride through with regard to each pair of transformers; and adjusting a relay protection configuration scheme with regard to each pair of transformers. By the low-voltage power supply switching method, a rapid switching device is integrated to an existing low-voltage protection control system at relatively low investment, and uninterruptible power switching of a large-size thermal power plant under a low-voltage power supply accident is achieved; and meanwhile, by the low-voltage power supply switching method, the competitiveness of a power plant design and a general engineering project of China in international market is improved, and a basic technical support is provided for a power enterprise of China occupying the international market.

Description

technical field [0001] The invention relates to the technical field of electrical engineering in the thermal power generation industry, in particular to a low-voltage power supply switching method in a thermal power plant considering the idling characteristics of motor groups. Background technique [0002] The plant power system needs to be switched when the generator set is started, shut down and faulty, so as to ensure the safety and reliability of the plant power system. In the past, the parallel switch between plant power and backup power or manual power failure switching was often used for plant power switching. The impact current is large, which poses a certain threat to the safety of the power grid, and the operation is cumbersome, which is not conducive to production needs. With the advancement of technology, fast switching devices are widely used in the switching of high-voltage industrial power supplies, which can realize switching without power failure in most cas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06
CPCH02J9/061Y02B70/30Y04S20/20
Inventor 裴善鹏鲁浩王颖于青孙佳佳付向军李春莹尹晓东
Owner SHANDONG ELECTRIC POWER ENG CONSULTING INST CORP
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