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Coordinated control method for converter stations and multi-converter stations in flexible DC power grid

A flexible DC and DC power grid technology, applied in the direction of power transmission AC network, circuit devices, electrical components, etc., to achieve the effect of voltage stability

Active Publication Date: 2019-03-05
XUJI GRP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a flexible DC power grid converter station and multi-converter station coordinated control method, which is used to solve the problem of abnormal working state that may occur when the communication between stations is abnormal

Method used

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  • Coordinated control method for converter stations and multi-converter stations in flexible DC power grid
  • Coordinated control method for converter stations and multi-converter stations in flexible DC power grid
  • Coordinated control method for converter stations and multi-converter stations in flexible DC power grid

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Embodiment Construction

[0035] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0036] An embodiment of a multi-converter station coordinated control method for a flexible direct current grid of the present invention:

[0037] The DC power grid generally includes a DC voltage master control station and at least one DC voltage control slave station. Among them, the DC voltage master control station controls the DC voltage of the entire system and works in the DC voltage control mode, and all other converter stations choose the active power control mode , if the DC voltage master control station is out of service, the DC system will operate according to the following steps:

[0038] 1) When the communication between the DC voltage master control station and the DC voltage control slave station is normal, one DC voltage control slave station takes over the DC voltage control as the DC voltage control station, and the remai...

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Abstract

The invention relates to a converter station of a flexible DC power grid and a coordination control method for many convertor stations. A DC voltage deviation controller is input to a DC voltage control slave station for running to achieve voltage stability of the DC power grid when a DC voltage master control station and the DC voltage control slave station are abnormal in communication and the DC voltage master control station stops running. By the method, DC voltage control is not needed to be managed by the DC voltage control slave station when the communication is abnormal and the DC voltage master control station stops running, and the problem that the DC power grid works in an abnormal working state caused by that the DC voltage control slave station manages DC voltage control during abnormal communication among stations is effectively solved.

Description

technical field [0001] The invention belongs to the field of flexible direct current transmission of power systems, and in particular relates to a converter station of a flexible direct current power grid and a coordinated control method for multiple converter stations. Background technique [0002] Since the multi-terminal flexible DC transmission has the advantages of operational flexibility and reliability, it has more advantages than two-terminal flexible DC transmission in terms of grid interconnection, urban grid power supply, and interconnection of multiple wind farms (new energy). In a flexible DC system, the DC voltage is generally controlled by a main converter station, but when the main converter station fails, in order to maintain the stability of the DC voltage and the normal operation of the flexible DC grid, other coordinated control strategies must be used to control the DC voltage. , and realizing the coordinated control of each station of multi-terminal fle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J13/00
CPCY02E60/60
Inventor 刘欣和吴金龙杨美娟张浩王先为田书然刘杰行登江马焕李道洋
Owner XUJI GRP
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