Coordinated Control Method of Converter Station and DC Circuit Breaker in Flexible DC System

A DC circuit breaker and flexible DC technology, applied in the direction of power transmission AC network, AC network with the same frequency from different sources, etc., can solve the problems of converter station damage, converter station voltage out of control, etc., to prevent out of control, suppress Effect of inrush current

Active Publication Date: 2020-01-07
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the removal of the faulty line will lead to the isolation of the converter station in the constant active power control mode, and the voltage of the converter station will be out of control, which may cause damage to the converter station

Method used

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  • Coordinated Control Method of Converter Station and DC Circuit Breaker in Flexible DC System
  • Coordinated Control Method of Converter Station and DC Circuit Breaker in Flexible DC System
  • Coordinated Control Method of Converter Station and DC Circuit Breaker in Flexible DC System

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Embodiment Construction

[0026] In order to prevent the voltage of a DC system converter station from being out of control before reclosing, the invention discloses a reclosing coordinated control method between a flexible DC system converter station and a DC circuit breaker.

[0027] Describe in detail below in conjunction with accompanying drawing:

[0028] The main purpose of the coordinated control method disclosed in the present invention is to ensure that the voltage of the converter station will not lose control after the fault of the flexible direct current system, and to suppress the surge current of reclosing when the instantaneous fault occurs.

[0029] figure 1 It is an operation flowchart of the coordinated control method.

[0030] In the flexible DC grid, the DC circuit breaker will immediately cut off the faulty line after the fault of the DC transmission line, and the converter station controlling the active power will be isolated in some cases.

[0031] Such as figure 2 In the two...

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PUM

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Abstract

The invention discloses a coordinated control method of a flexible DC system converter station and a DC circuit breaker, belonging to the field of DC transmission system relay protection. The method comprises the following steps: when a fault occurs, a DC circuit breaker is used to cut off a fault line and an isolated converter station in an active power control mode is found out; The active powerreference value of the converter station control system is changed into alpha times of the original rating value; After the voltage of the converter station is restored to the rated value of the DC system, the reference value of the active power of the control system is changed to 0; Reclosing the DC circuit breaker at the outlet of the converter station after the necessary insulation recovery time; Detect whether the fault continues to exist: report system overhaul if the fault is still present, and restore the active power reference value of the control system to the rated value before thefault if the fault has been cleared; This method can create conditions for DC system to reclose quickly, restrain the impulse current of reclosing in the fault clearing state, and is beneficial to thestable and reliable operation of DC system.

Description

technical field [0001] The invention relates to a reclosing coordinated control method of a converter station of a flexible direct current system and a direct current circuit breaker, belonging to the field of relay protection of a direct current transmission system. Background technique [0002] The flexible DC transmission system based on voltage source converters has developed rapidly in recent decades. The establishment of a flexible DC transmission system will help gather clean energy such as wind energy and solar energy distributed in various places, and promote the development and utilization of new energy. The stable and reliable operation of the flexible DC grid is inseparable from the protection system. The Zhangbei flexible DC grid currently under construction is the largest flexible DC grid in the world. The flexible DC system will use overhead lines as transmission lines and use DC circuit breakers to break DC faults. With the use of overhead transmission lines,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/06
CPCH02J3/06H02J3/36Y02E60/60
Inventor 王顺亮舒稷刘天琪
Owner SICHUAN UNIV
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