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A control and protection method for a flexible direct current transmission system

A flexible DC and power transmission system technology, applied to emergency protection circuit devices, electrical components, power transmission AC networks, etc., can solve problems such as power outage accidents and the inability to distinguish the location of AC faults

Active Publication Date: 2020-07-07
STATE GRID LIAONING ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the flexible DC transmission system adopts the fault ride-through strategy when the AC fault occurs. This method cannot distinguish the location of the AC fault. After the AC protection action, it may continue to feed current to the fault point or cause a power outage.

Method used

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  • A control and protection method for a flexible direct current transmission system
  • A control and protection method for a flexible direct current transmission system
  • A control and protection method for a flexible direct current transmission system

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Embodiment Construction

[0033] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0034] A control and protection method for a flexible direct current transmission system provided by the present invention is divided into a control and protection method for a medium-low voltage transmission system and a control and protection method for a high-voltage transmission system.

[0035] (1) Control and protection methods for medium and low voltage transmission systems

[0036] The medium and low voltage transmission system lines usually adopt distance protection, single-ended circuit breakers are used, and the method of tripping three phases at any fault and reclosing three phases at the same time is used to clear the fault. according to figure 1 As shown, if the fault point is the outgoing line fault of F2, the outgoing line circuit breaker Q2 can be tripped. At this time, the converter has no ...

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Abstract

The invention provides a control protection method for a flexible direct current power transmission system. A running state of an alternating current system is determined through a method combining alternating current voltage detection and alternating current frequency detection; and a running mode for enabling a flexible direct current system to be matched with actions of an alternating current system is determined. The control protection method comprises a high voltage power transmission system control protection method and a low voltage power transmission system control protection method; the control protection method is applicable to all existing alternating current systems; the matching time of the control protection system is greatly reduced; the power supply reliability of the system is improved; and the utilization rate of the flexible direct current power transmission system is ensured to the maximum.

Description

technical field [0001] The invention relates to flexible direct current transmission technology, in particular to a control and protection method for a flexible direct current transmission system. Background technique [0002] Flexible DC transmission is a new type of power transmission technology after AC transmission and conventional DC transmission. It has the advantages of low harmonic content and flexible control. The back-to-back flexible DC transmission system is also called flexible ring network control device and partition interconnection device according to its different functions. The back-to-back flexible DC system can not only effectively solve the problem of excessive short-circuit current in the original AC system, but also realize the soft partition operation of the AC grid and improve the reliability of the AC grid power supply. [0003] After the flexible DC transmission system is connected to the AC grid, on the one hand, it will affect the original AC pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02H7/26
CPCH02H7/268H02J3/36Y02E60/60
Inventor 周杨庞辉杨杰李强阳岳希张艳军高凯周季季兰兰李铁张强
Owner STATE GRID LIAONING ELECTRIC POWER RES INST
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