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A Threshold Value Setting Method for Prediction Link of DC Commutation Failure

A technology of commutation failure and threshold value, which is applied in the direction of AC network circuits, power transmission AC networks, circuit devices, etc., can solve the problems of large absorption of AC systems, continuous commutation failure of itself, and other DC recovery effects, etc., to achieve improved recovery ability, the effect of reducing power shock

Active Publication Date: 2020-12-04
NARI TECH CO LTD +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While suppressing the commutation failure of a certain DC, CFPRED will absorb a large amount of reactive power from the AC system, which may affect the recovery of other DCs, and even cause its own continuous commutation failure

Method used

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  • A Threshold Value Setting Method for Prediction Link of DC Commutation Failure
  • A Threshold Value Setting Method for Prediction Link of DC Commutation Failure
  • A Threshold Value Setting Method for Prediction Link of DC Commutation Failure

Examples

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Embodiment 1

[0030] An embodiment of the present invention, its implementation steps are as follows figure 1 As shown, the details are as follows:

[0031] 1) Determine the maximum allowable commutation failure times for each DC. According to the constraints of the safe and stable operation of the power grid at each DC sending and receiving end and the constraints of the DC control and protection capacity, determine the maximum allowable number of commutation failures for each DC, and set the maximum allowable number of commutation failures for the i-th DC to N i , i=1,2,...,n, where n is the total number of all direct currents.

[0032] 2) Determine the total installed capacity of each DC matching condenser, and set the total installed capacity of the i-th DC matching condenser as Q gi .

[0033] 3) Calculate the self-recovery capability index of each DC:

[0034]

[0035] In the formula, Si is the self-recovery ability index of the i-th DC, M SCRi is the multi-infeed effective sh...

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Abstract

The invention belongs to the technical field of an electric power system and automation thereof, and discloses a method for setting a direct current commutation failure prediction link starting valueby integrating the supporting capacity of a phase regulator and interactive influences of multi-infeed direct current. The interactive influences in the multi-infeed direct current recovery process are considered, a quantitative evaluation method for the direct current recovery cost is proposed, and a differentiated setting principle for the multi-circuit direct current commutation failure prediction link starting value is provided accordingly, so that the occurrence probability of continuous commutation failure of multi-infeed direct current is reduced, and the power impact for a receiving-end power grid is reduced. The method can provide a reference for safe and stable running and control strategy formulation of a multi-infeed direct current system.

Description

technical field [0001] The invention belongs to the technical field of power system automation. More precisely, the invention relates to a method for setting the threshold value of a DC commutation failure prediction link. A method for setting the threshold value of commutation failure prediction link. Background technique [0002] With the gradual commissioning of large-capacity UHV DC, the characteristics of "strong direct current and weak AC" of the power grid have become increasingly prominent, and the AC-DC coupling effect has become increasingly tight. Failure and other problems have caused a great impact on the UHV tie line of the sending end system, threatening the safe and stable operation of the UHV AC-DC interconnection grid. [0003] Both the State Grid and the China Southern Power Grid have large-scale multi-infeed DC transmission systems. Taking the State Grid East China Power Grid as an example, in 2017, with the commissioning of UHV Yanhuai DC and Xitai DC,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 王玉侯玉强刘福锁李威罗剑波薛峰李碧君李兆伟张红丽周磊吴雪莲黄志龙曹路李建华李海峰庄侃沁罗凯明顾晓玲张倩
Owner NARI TECH CO LTD
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