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Bipolar flexible direct current network neutral line transfer switch configuration system and conversion method

A conversion method and flexible direct current technology, applied in the direction of power transmission AC network, etc., can solve the problems that do not involve the neutral line area switch scheme and operation mode conversion method of the flexible direct current grid with bipolar metal loops, and achieve clear functions, The steps are simple and easy, and the effect of satisfying reliability

Active Publication Date: 2019-01-11
STATE GRID ECONOMIC TECH RES INST CO
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  • 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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  • Bipolar flexible direct current network neutral line transfer switch configuration system and conversion method
  • Bipolar flexible direct current network neutral line transfer switch configuration system and conversion method

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Embodiment Construction

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

[0022] Such as figure 1 , figure 2 As shown, the present invention provides a bipolar flexible DC power grid neutral line transfer switch configuration system, which includes a positive neutral line circuit, a negative neutral line circuit, two metal loop circuits and a ground branch circuit. The positive neutral line circuit is provided with a first neutral bus switch NBS1, and the negative neutral line circuit is provided with a second neutral bus switch NBS2. The neutral line switch is mainly used to transfer load current or fault current to the metal circuit. In this way, the single pole (single converter unit) is planned to be overhauled or fault removed 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 the metal loop switc...

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Abstract

The invention relates to a bipolar flexible direct current network neutral line transfer switch configuration system and a conversion method, comprising a positive neutral line circuit, a neutral busswitch is arranged in the positive neutral circuit of the fast neutral ground switch, a neutral bus switch is arranged in the negative neutral circuit of the fast neutral grounding switch, and the fast neutral grounding switch is used for ensuring the normal operation of the non-fault electrode by transferring the load current or the fault current to the metal return line so as to realize the single-pole planned maintenance or fault removal; a metal loop switch and a metal loop switch are respectively arrange in that metal loop circuit of the two fast neutral line grounding switch, and the metal loop switch of the fast neutral line grounding switch is use for cutting and putting the metal loop; a fast neutral grounding switch is arranged next to the grounding resistance in the grounding branch of the fast neutral grounding switch, and the fast neutral grounding switch is used for on-line replacement of the grounding station.

Description

Technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a bipolar flexible direct current power grid neutral line conversion switch configuration system and an operation mode conversion method. Background technique [0002] The large-capacity flexible DC grid can give full play to the technical advantages of flexible DC transmission. It is an effective solution to achieve large-scale wind power, photovoltaic, pumped storage and other energy access and transmission, multi-power supply and multi-drop power receiving wide-area coordination and complementation The scheme is conducive to the flexible energy interaction between renewable energy, pumped storage and other energy storage and load, is conducive to the day and night complementation of large-scale photovoltaic and wind energy, is conducive to solving the problem of large-scale renewable energy system peak shaving, and is conducive to reducing The impact of...

Claims

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Application Information

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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
Owner STATE GRID ECONOMIC TECH RES INST CO
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