Operation mode conversion method of neutral line transfer switch in bipolar flexible direct current grid

A conversion method and flexible DC technology, applied in power transmission AC networks and other directions, can solve problems such as the switching scheme and operation mode conversion method in the neutral line area of ​​the flexible DC power grid with bipolar flexible DC line, etc., and achieve a clear effect, The effect of low number of equipment and high economy

Active Publication Date: 2021-08-10
STATE GRID ECONOMIC TECH RES INST CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing technical means do not involve the switching scheme and operation mode conversion method in the neutral line area of ​​the flexible DC power grid with metal loops in bipolar lines.

Method used

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  • Operation mode conversion method of neutral line transfer switch in bipolar flexible direct current grid
  • Operation mode conversion method of neutral line transfer switch in bipolar flexible direct current grid

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] Such as figure 1 , figure 2 As shown, the present invention provides a bipolar flexible DC power grid neutral line conversion switch configuration system, which includes a positive neutral line circuit, a negative neutral line circuit, two metal loop circuits and a grounding branch. The first neutral bus switch NBS1 is set in the positive neutral line circuit, and the second neutral bus switch NBS2 is set in the negative neutral line circuit. The neutral line switch is mainly used to transfer the load current or fault current to the metal return line. Line so as to realize the planned maintenance or fault removal of single pole (single converter unit) while ensuring the normal operation of the non-faulty pole. The two metal loop circuits are respectively provided with a first metal loop switch MSB1 and a second metal loop switch MSB2, and th...

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Abstract

The invention relates to a configuration system and a conversion method for a bipolar flexible DC power grid neutral line transfer switch, which includes a positive neutral line circuit, a neutral bus switch is set in the positive neutral line circuit of a fast neutral line grounding switch, and a fast neutral line grounding switch is provided in the positive neutral line circuit. Neutral busbar switch is set in the negative neutral circuit, and fast neutral grounding switch Neutral switch is used to realize single-pole planned maintenance or fault removal by diverting load current or fault current to metal return line At the same time to ensure the normal operation of non-faulty poles; the two fast neutral grounding switch metal return circuits are respectively equipped with a metal return switch and a metal return switch, and the fast neutral grounding switch metal return switch is used for metal return Cut off and put in; located next to the grounding resistor in the grounding branch of the fast neutral grounding switch, a fast neutral grounding switch is provided, and the fast neutral grounding switch is used for the grounding station Online replacement.

Description

technical field [0001] The invention relates to the technical field of flexible DC power transmission, in particular to a bipolar flexible DC grid neutral line changeover switch configuration system and an operation mode conversion method. Background technique [0002] The large-capacity flexible DC power grid can take advantage of the technical advantages of flexible DC transmission, and it is an effective solution to realize the access and transmission of large-scale wind power, photovoltaics, pumped storage and other energy sources, multi-source power supply and multi-drop power receiving wide-area coordination and complementarity The scheme is conducive to the flexible energy interaction between renewable energy, pumped storage and other energy storage and loads, is conducive to the day and night complementarity of large-scale photovoltaic and wind energy, is conducive to solving the problem of large-scale renewable energy system peak regulation, and is conducive to reduc...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor薛英林梅念李高望赵峥李探魏争厉璇乐波陈钊苑宾许冬刘思源徐莹李达田园园尹航程炜常赟晖
OwnerSTATE GRID ECONOMIC TECH RES INST CO