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Power grid transmission capacity-increasing transformation method based on double MMC current converters

A capacity-increasing transformation and converter technology, applied in the field of power transmission systems, can solve the problems of not considering the space charge problem, cable insulation breakdown, space charge accumulation, etc., to weaken the space charge accumulation, ensure insulation performance, and technology maturity high effect

Active Publication Date: 2015-12-16
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the space charge accumulation of AC cable lines is serious under DC conditions, and the electric field strength in the insulation can increase to 7 to 9 times the initial value after long-term pressurization
However, the space charge problem was not considered in the development of the actual AC cable, so after the AC cable line is converted to DC operation, the space charge will cause electric field distortion, and in severe cases, it will cause breakdown of the cable insulation.

Method used

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  • Power grid transmission capacity-increasing transformation method based on double MMC current converters
  • Power grid transmission capacity-increasing transformation method based on double MMC current converters
  • Power grid transmission capacity-increasing transformation method based on double MMC current converters

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Embodiment Construction

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0042] The invention provides a power grid transmission capacity increase transformation method based on dual MMC converters, which utilizes the good control performance of the modular multi-level voltage source converter, and solves the problem of capacity increase transformation of AC cable lines , reduce the impact of space charge accumulation on the insulation of AC cable lines, and have functions such as dynamic reactive power compensation and harmonic control. It is of great significance to solve the contradiction between th...

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Abstract

The invention provides a power grid transmission capacity-increasing transformation method based on double MMC current converters, comprising the steps of: establishing a voltage source current converter and a voltage current regulator, wherein the voltage source current converter comprises a sending end voltage source current converter and a receiving end voltage source current converter, and the voltage current regulator comprises a sending end voltage current regulator and a receiving end voltage current regulator; connecting the sending end voltage source current converter between a sending end alternating current system and the sending end voltage current regulator, and connecting the receiving end voltage source current converter between a receiving end alternating current system and the receiving end voltage current regulator; and connecting the sending end voltage current regulator with the receiving end voltage current regulator through alternating current cables. Compared with the prior art, the power grid transmission capacity-increasing transformation method based on the double MMC current converters provided by the invention has the advantages of dynamic reactive power compensation, harmonic suppression and the like, and has significant meaning in solving contradiction of increasing load and increasing difficulty in building new circuits.

Description

technical field [0001] The invention relates to the field of power transmission systems, in particular to a method for improving the capacity of power grid transmission based on double MMC converters. Background technique [0002] In recent years, the speed of urbanization has been further accelerated, and the urban electricity load has continued to increase. Objectively, the scale and transmission capacity of the power grid are required to maintain continuous development. However, the following problems generally exist in urban power grids. [0003] The city's electricity load has increased, the transmission capacity of AC lines is insufficient, and the line corridors are scarce. For heavy-duty AC lines, it is impossible to greatly increase the transmission capacity by installing FACTS devices, and new lines encounter increasing resistance, especially for line projects into cities, which are difficult to get support in terms of land acquisition and environmental protection....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/16H02J3/01H02M3/335
CPCY02E40/30Y02E40/40Y02E60/60
Inventor 田鑫全程浩荆平杨继业赵波孙刚宋卓然刘岩宋颖巍刘明岳龚树东戴承文
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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