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Method for resolving three-phase short-circuit fault critical clearing time (CCT) of power system on line

A critical cut-off time and power system technology, applied in emergency protection circuit devices, electrical components, electrical digital data processing, etc., can solve the problems of many CCT cycles, large shrinkage range, and reduced calculation speed, so as to improve calculation speed, The effect of obvious advantages and reduced calculation times

Active Publication Date: 2013-01-02
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

[0013] Due to the conservative setting of the initial value and the large shrinkage range, the number of CCT cycles obtained by this method is large, and the calculation speed will be significantly reduced in the analysis of large systems.

Method used

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  • Method for resolving three-phase short-circuit fault critical clearing time (CCT) of power system on line
  • Method for resolving three-phase short-circuit fault critical clearing time (CCT) of power system on line
  • Method for resolving three-phase short-circuit fault critical clearing time (CCT) of power system on line

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Experimental program
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Embodiment

[0117]The online application of CCT fast hybrid algorithm can be realized by integrating the function module of three-phase short-circuit critical cut-off time fast hybrid algorithm in PDSA. The block diagram of the PDSA system using the critical cut-off time hybrid algorithm is as follows: image 3 Shown: image 3 It is the framework diagram of the mixed method CCT solving system based on PDSA platform provided by the present invention.

[0118] (1) Data integration:

[0119] Data integration is one of the main functions of the PDSA dynamic data platform. It is responsible for the identification and verification of online data detection, automatic splicing of large power grid data, and automatic matching of online / offline data, providing more comprehensive and accurate network-wide data for high-level applications. .

[0120] (2) Fault set selection:

[0121] According to the historical data and the results of offline analysis, the severe fault set consisting of the weak ...

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Abstract

The invention relates to an online resolving method, in particular to a method for resolving three-phase short-circuit fault critical clearing time (CCT) of a power system on line. The method comprises the following steps of: (1) calculating an initial value of CCT; (2) setting the maximum and minimum of fault clearing time; (3) searching the CCT through dichotomy; (4) judging whether the CCT is found; (5) resetting the initial value and calculating the initial value through a traditional method if the CCT is not found; and (6) ending the calculation if the CCT is found. According to the method, complementary advantages of the direct method and time domain simulation analysis are considered on the basis of error range analysis of a potential energy boundary surface (PEBS) method, when the CCT is calculated, the calculation result of the PEBS method is taken as the initial value, the CCT is accurately searched through the time domain simulation analysis method, and the requirements of precision and speed can be simultaneously met.

Description

technical field [0001] The invention relates to an online obtaining method, in particular to an online obtaining method for the critical cut-off time of a three-phase short-circuit fault in a power system. Background technique [0002] With the wide access of new energy sources, the complexity of the system increases, and it is more and more important to obtain the limit of transient stability. The main tools of current transient stability analysis are direct method and time domain simulation method. The time-domain simulation method is based on strict mathematical models and solution methods, and can accurately reflect the operation of the system under large disturbances (such as three-phase short-circuit faults). The direct method avoids the step-by-step integration process of the time-domain simulation method, and can give quantitative results, so it is widely used in the transient stability analysis of power systems. [0003] Ctitcal Clearing Time (CCT) of three-phase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00H02H7/26
Inventor 任玲玉田芳严剑峰于之虹苏峰
Owner CHINA ELECTRIC POWER RES INST
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