Hybrid DC transmission system voltage source type inverter online exit method and device

A technology of voltage source type and power transmission system, which is applied in the direction of power transmission AC network, etc., to achieve the effect of convenient operation, simple structure and protection safety

Active Publication Date: 2019-05-10
NR ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the on-line switching technology of thyristor-type converters in conventional HVDC transmission systems is relatively mature, and the online switching-on and off-line technology of voltage source converters in hybrid HVDC transmission systems is still under study.

Method used

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  • Hybrid DC transmission system voltage source type inverter online exit method and device
  • Hybrid DC transmission system voltage source type inverter online exit method and device
  • Hybrid DC transmission system voltage source type inverter online exit method and device

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Embodiment Construction

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the specific implementation manners of the technical solutions of the present invention will be described in more detail and clearly below in conjunction with the drawings and embodiments. However, the specific embodiments and examples described below are for the purpose of illustration only, rather than limiting the present invention. It only contains a part of the embodiments of the present invention, but not all of them. Other embodiments obtained by those skilled in the art through various changes of the present invention all belong to the protection scope of the present invention.

[0041] It should be understood that although the terms first, second, third, etc. may be used herein to describe various elements or components, these elements or components should not be limited by these terms. These terms are only used to distinguish one element or ...

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Abstract

The invention provides a hybrid DC transmission system voltage source type inverter online exit method and device. An inverse inverter station of a hybrid DC transmission system includes at least oneset of voltage source type inverter unit and a fourth bypass switch connected in parallel with the voltage source type inverter units; the voltage source type inverter unit includes a voltage source type inverter and a diode valve which are connected in series; and the negative electrode of the diode valve is connected to the positive electrode of the voltage source type inverter. The hybrid DC transmission system voltage source type inverter online exit method comprises the following steps: a bypass thyristor valve block is controlled to be put into operation, wherein the bypass thyristor valve block is connected in series with a series switch and then is connected in parallel with the voltage source type inverter unit, and the positive electrode of the diode valve is connected to the positive electrode of the bypass thyristor valve block; the fourth bypass switch is closed; the voltage source type inverter is blocked; the bypass thyristor valve block is blocked; the series switch isdisconnected; after the rectifier inverter station detects that the inverse inverter station exits an inverter, one of the high-side thyristor inverter or the low-side thyristor inverter is exited. The invention has the advantages of simple structure and convenient operation, which can effectively reduce current surge and power loss, and protect equipment safety.

Description

technical field [0001] The invention relates to the technical field of hybrid direct current transmission, in particular to a method and device for online withdrawal of a voltage source converter in a hybrid direct current transmission system. Background technique [0002] HVDC transmission systems can be divided into two types, one is the conventional DC transmission system (LCC-HVDC) based on thyristor technology, and the other is the flexible DC transmission system (VSC-HVDC) based on fully controlled voltage source converters. . [0003] Among them, the conventional direct current transmission system (LCC-HVDC) has the advantages of low cost, low loss, and mature operation technology. The station occupies a large area. The new generation of flexible DC transmission system has the advantages of decoupling control of active power and reactive power, power supply to passive network, compact structure, small footprint, and no commutation failure on the inverter side. Ther...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 俞翔赵文强王永平卢宇田杰杨建明黄志岭
Owner NR ELECTRIC CO LTD
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