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Method and system for identifying power loss of UHVDC transmission system by stability control device

A UHV DC and DC power technology, applied in the direction of circuit devices, AC network circuits, electrical components, etc., can solve the problem of effective verification of DC power loss, unrecognized DC power drop information, and insufficient consideration of DC successive faults, etc. problems, to achieve the effect of reducing the risk of cascading failures, significant economic and social benefits, and improving safety margins

Active Publication Date: 2021-06-18
NARI TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1) The DC power drop information is not recognized;
[0007] 2) DC sequential faults are not fully considered;
[0008] 3) No effective verification of the identified DC power loss

Method used

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  • Method and system for identifying power loss of UHVDC transmission system by stability control device
  • Method and system for identifying power loss of UHVDC transmission system by stability control device
  • Method and system for identifying power loss of UHVDC transmission system by stability control device

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Embodiment Construction

[0085] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0086]In view of the current demand of the power grid for the stability control device to quickly and accurately identify the power loss of the UHV DC transmission system, a method for the stability control device to identify the power loss of the UHV DC transmission system is provided. When a single or successive fault occurs in the DC system, The stability control device can quickly and accurately identify the amount of DC power loss, provide a reference for further taking appropriate control measures, and effectively ensure the safe and stable operation of the power grid.

[0087] A method for identifying the power loss of an UHV DC transmission system by a stabilization control device of the...

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Abstract

The invention discloses a method and a system for a stability control device to identify the power loss of an UHV direct current transmission system, belonging to the field of electric power systems and automation thereof. The DC transmission power loss that needs to be identified by the stability control device is mainly divided into two situations: DC power drooping and converter blocking. The stability control device judges the DC power drop or converter lockout each time, and calculates the transmission power of the operating converter after the DC fault in combination with the total DC transmission power during the normal operation of the system to identify the power loss of the DC transmission system. The invention ensures the accuracy and effectiveness of the stability control device in identifying the power loss of the DC transmission system in the case of single or successive faults in the UHV DC transmission system, and further adopts appropriate control measures to help ensure the safe and stable operation of the AC-DC power grid .

Description

technical field [0001] The invention relates to the technical field of electric power systems and automation thereof, in particular to a method and system for a stability control device to identify power loss in an UHVDC transmission system. Background technique [0002] In order to meet the intensive development and utilization of large coal power, large hydropower, large nuclear power, and large renewable energy bases, it is necessary to optimize the allocation of power resources across the country through long-distance large-scale transmission. [0003] With the advancement and maturity of technology, UHV DC has become an important choice for inter-regional power transmission. The step-wise increase in UHVDC transmission scale has resulted in increasingly complex grid operation characteristics, and grid security is facing prominent challenges. [0004] Due to the large UHV DC transmission capacity, once a DC fault occurs, the large-capacity power change will have a huge ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2003/365Y02E60/60
Inventor 刘天翼薛峰董希建李雪明王忠明卢军李碧君李志辉颜云松李明应尹旭阳方勇杰罗剑波崔强刘平李兆伟夏海峰
Owner NARI TECH CO LTD
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