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Method and system for on-line dynamical screening of electric power system

A technology of power system and screening method, applied in the direction of power network operating system integration, information technology support system, electrical components, etc., can solve the problems of energy margin incompatibility and inconsistency

Inactive Publication Date: 2005-07-27
TOKYO ELECTRIC POWER CO HLDG INC +1
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  • Application Information

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Problems solved by technology

However, as shown in several numerical simulations, the second recoil method cannot always satisfy the basic requirements (B-1) to (B-3)
Specifically, the energy margin calculated by the second recoil method is often incompatible and inconsistent with the exact energy margin

Method used

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  • Method and system for on-line dynamical screening of electric power system
  • Method and system for on-line dynamical screening of electric power system
  • Method and system for on-line dynamical screening of electric power system

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Embodiment Construction

[0179] The present invention develops a new type of system, that is, the BCU-DSA system, which is used for online dynamic safety assessment and energy margin calculation of actual power systems. The BCU-DSA system consists of the following three main subsystems:

[0180] (i) Improved BCU classifier

[0181] (ii) BCU-guided time domain simulation program for stability assessment and energy margin calculation

[0182] (iii) BCU-DSA system, which is a hybrid structure of an improved BCU classifier and a BCU-guided time-domain simulation program, which performs online dynamic security assessment and energy margin calculation of the actual power system.

[0183] 5.1 Improved BCU classifier

[0184] The main design objective of the modified BCU classifier is to ensure that all five requirements mentioned above for online dynamic accident screening are met. To this end, eight BCU classifiers were developed and integrated to form an improved BCU classifier that performs online dy...

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Abstract

An online dynamic screening system for accidents comprising hypothetical disturbances experienced by a power system, the screening system comprising: a dynamic accident screening program using a plurality of accident classifiers based on finding a control instability equilibrium of the power system Multiple incidents are assessed using a point approach called the Stable Zone Boundary Controlled Unstable Equilibrium Point method by applying the sequence of incidents to the Network Islanding Problem Classifier, the S.E.P Problem Classifier, the Large Stable Zone Classification classifier, exit point problem classifier, ray regulation problem classifier, energy function problem classifier, CUEP convergence problem classifier, and control UEP (Unstable Equilibrium Point) classifier to form the first group of stable accidents and the second group of non- a stable or undecided accident; and a time domain simulation program for determining which of said second set of accidents is unstable.

Description

technical field [0001] The invention relates to the field of power systems, and more particularly to methods for on-line transient stability analysis, on-line dynamic safety assessment and energy margin calculation of actual power systems. Background technique [0002] Power systems continuously experience disturbances. These disturbances can be classified as event disturbances or load disturbances. The planning and operation of the power system should be able to withstand the occurrence of some specific disturbances. Currently, modern energy management systems (EMS) regularly perform online (static) safety assessment tasks to ensure that power systems withstand credible accidents (disturbances). A credible incident group is a collection of disturbances that are likely to occur with potentially severe consequences. The evaluation involves selecting a set of credible incidents and then evaluating the ability of the system to withstand their impact. [0003] The extension ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/24
CPCY02E60/76H02J3/24H02J2003/388Y04S40/22H02J2003/001H02J2003/007H02J3/388H02J2203/20Y02E60/00Y04S40/20Y04S20/222Y02B70/3225H02J3/0012
Inventor 蒋小东栗田笃冈本浩田边隆也多田泰之小柳薰周意诚
Owner TOKYO ELECTRIC POWER CO HLDG INC
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