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Pole block comprehensive distinguishing method for DC power transmission system

A technology of direct current transmission system and discrimination method, which is applied in the direction of electrical components, circuit devices, fault locations, etc., can solve the problems of pole-blocking discrimination method without the disclosure of a better solution, and achieve the effect of reliable discrimination

Inactive Publication Date: 2006-07-26
NR ELECTRIC CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] At present, there is no better scheme for the discrimination method of DC transmission system pole blocking for the stability control system.

Method used

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  • Pole block comprehensive distinguishing method for DC power transmission system
  • Pole block comprehensive distinguishing method for DC power transmission system
  • Pole block comprehensive distinguishing method for DC power transmission system

Examples

Experimental program
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Embodiment Construction

[0030] As above criterion and logic block diagram: figure 1 Logic description: The logic of pole one or pole two blocking is: comprehensively utilize the DC pole power, and benefit the stability control device from the DC operation state and the pole operation state input signal given by the DC pole control system, and then output pole blocking and other signals.

[0031] The above-mentioned stability control device obtains three switch-in signals of "Status Pole Blocked", "Status Pole Deblocked" and "Protection Block / ESOF" from the DC pole control system, and combines the local pole power Pdc collected by the self-commutation rheology to judge the local pole blocking state.

[0032] It can be quickly and reliably judged after the pole blocking of the DC system occurs, and provides a reliable material basis for the stability control system to quickly take stability control measures. This method will not be misjudged as pole-blocking when the DC system is running normally, and...

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Abstract

Disclosed is a method for judging direct current transmission system direct current pole interlock. A stabilizing device is provided with a single time monopole interlock, double pole interlock, double poles interlock restart, successive interlock and successive interlock restart; the judging method comprises steps of: the stabilizing device setting double pole interlock time Tset1 and successive interlock time Tset2 for judging the single pole, double pole interlock or successive interlock, including restart; single time monopole interlock: taking one pole interlock accident in the Tset1 time; double poles interlock: taking two poles interlock accidents in Tset1 time; successive interlock: taking two poles interlock accidents out of Tset1 time and in Tset2 time.

Description

technical field [0001] The invention relates to a method for judging pole blocking of a direct current transmission system in a power system. Background technique [0002] The power transmission in the power grid has been widely used DC transmission. The failure of the DC transmission system has a great impact on the safety and stability of the entire power system. The use of large-capacity, long-distance HVDC lines for DC networking has obvious economic advantages over AC networking. China Southern Power Grid has formed a "six AC and three direct" west-to-east power transmission channel; with the commissioning of the Three Gorges generator set, there are also two direct current interconnections in Central China and East China. Due to the lack of experience in the operation of DC equipment, the equipment failure rate is high, which seriously threatens the safe and stable operation of the power system. In the case of DC blocking, fast and reliable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08H02J13/00
Inventor 宗洪良任祖怡陈松林郑玉平沈国荣
Owner NR ELECTRIC CO LTD
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