Full bridge type MMC direct current ice melting apparatus and control method therefor

A DC ice-melting, bridge-type technology, applied in overhead installation, cable installation, electrical components, etc., can solve the problems of limited application range, reduced comprehensive operation benefit, slow response speed, etc.

Inactive Publication Date: 2016-08-31
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional DC deicing device can achieve reactive power compensation and DC deicing mode conversion through the simple opening and closing operation of the external isolating switch, but the harmonics generated during operation are relatively large, and the response speed is slightly slow, so a large-capacity filter needs to be installed When the traditional DC ice me

Method used

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  • Full bridge type MMC direct current ice melting apparatus and control method therefor
  • Full bridge type MMC direct current ice melting apparatus and control method therefor
  • Full bridge type MMC direct current ice melting apparatus and control method therefor

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Embodiment Construction

[0039] The implementation will be described in detail below in conjunction with the accompanying drawings.

[0040] The structural diagram of a full-bridge type MMC DC ice-melting device of the present invention is as follows figure 1 shown, including: connect the reactor L T , full bridge type MMC, ice melting knife switch S1, S2, S3, S4; among them, the reactor L T One end of the terminal is connected to the 35kV or 10kV AC bus through the isolating switch K and the circuit breaker QF, and connected to the reactor L T The other end is connected to the AC side of the full-bridge MMC; one end of the ice-melting knife switch S1, S2 is connected to the positive pole of the DC side of the full-bridge MMC, and one end of the ice-melting knife switch S3, S4 is connected to the DC side of the full-bridge MMC. The negative pole is connected; the other end of ice-melting knife gate S1 is connected with one end of phase a of the AC line to be melted, the other end of ice-melting knif...

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Abstract

The invention belongs to the technical field of electric power system control and particularly relates to a full bridge type MMC direct current ice melting apparatus and a control method therefor. The apparatus comprises a circuit breaker, an isolating switch, a connecting reactor, a resonance filter-based full bridge type MMC, four ice melting knife switches and an alternating current line to be subjected to ice melting operation that are orderly connected. The method comprises a decoupling controller step, a direct current controller step and a uniform voltage modulation step. The full bridge type MMC direct current ice melting apparatus disclosed in the invention can satisfy ice melting requirements for lines of all voltage classes, and a reference basis can be provided for apparatus design. The control method put forward in the invention can provide a reference basis for control over the direct current ice melting apparatus.

Description

technical field [0001] The invention belongs to the technical field of electric power system control, and in particular relates to a full-bridge type MMC DC deicing device and a control method thereof. Background technique [0002] Among the natural disasters encountered by various power systems, ice and snow disasters are one of the most serious. Compared with other accidents, the losses caused by ice and snow disasters to the power grid are generally more serious, ranging from ice flashes to downed towers and broken lines, and even power network paralysis. [0003] At present, in order to improve the power grid's ability to resist ice and snow disasters, there are many methods and equipment for deicing and melting lines. The ice melting methods proposed at home and abroad are generally divided into four categories: thermal ice melting, mechanical deicing, natural passive deicing and other methods. Mechanical deicing is not easy to operate, and the natural passive deicing...

Claims

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Application Information

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IPC IPC(8): H02G7/16
CPCH02G7/16
Inventor 赵成勇郭裕群周月宾傅闯许树楷许建中
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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