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Method and system for identifying power loss of UHVDC 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. question

Active Publication Date: 2018-11-23
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 by stability control device
  • Method and system for identifying power loss of UHVDC by stability control device
  • Method and system for identifying power loss of UHVDC by stability control device

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Embodiment Construction

[0085] The present invention will be further described below in conjunction with the drawings. The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

[0086] In response to 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 failure occurs in the DC system, The stability control device can quickly and accurately identify the amount of DC power loss, provide a reference basis for further appropriate control measures, and effectively ensure the safe and stable operation of the power grid.

[0087] A method for a stability control device of the present invention to identify the amount of power loss in an UH...

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Abstract

The present invention discloses a method and a system for identifying power loss of UHVDC by a stability control device, and belongs to the field of electric power systems and automation thereof. DC transmission power loss that the stability control device needs to identify is mainly divided into two cases: DC power speed dropping and blocking of a converter. Each time the stability control deviceidentifies DC power speed dropping or blocking of the converter, calculating transmission power of the converter after a DC fault, and identifying direct current transmission power loss by using total transmission DC power during normal operation of the system. According to the method and the system for identifying power loss of UHVDC by the stability control device, accurateness and effectiveness in identification of the DC power transmission power loss under condition of single or sequential fault of the UHVDC is ensured, safety and stability in operation of a AC / DC power grid is ensuredby further adoption of corresponding control measures.

Description

Technical field [0001] The invention relates to the technical field of power systems and their automation, in particular to a method and system for a stability control device to identify the power loss of an UHV DC 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-scale renewable energy bases, it is necessary to optimize the allocation of power resources across the country through long-distance large-scale power transmission. [0003] With the advancement and maturity of technology, UHV DC has become an important choice for cross-regional power transmission. The step-wise increase in the scale of UHV DC transmission has resulted in more complex operation characteristics of the power grid, and the security of the power grid is facing outstanding challenges. [0004] Due to the large UHV DC transmission capacity, once a DC fault occurs, the large-capacity p...

Claims

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Application Information

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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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