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Power system voltage stability risk assessment method capable of considering load fluctuation limit

A technology for voltage stability and risk assessment, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as single angle of voltage stability assessment

Active Publication Date: 2015-05-27
TAIYUAN UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0017] The present invention solves the problem of single evaluation angle of the existing voltage stability, and provides a risk evaluation method of the voltage stability of the power system considering the load fluctuation limit

Method used

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  • Power system voltage stability risk assessment method capable of considering load fluctuation limit
  • Power system voltage stability risk assessment method capable of considering load fluctuation limit
  • Power system voltage stability risk assessment method capable of considering load fluctuation limit

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Embodiment Construction

[0151] The risk assessment method of power system voltage stability considering the load fluctuation limit is realized by the following steps:

[0152] (1) Obtain the node and component parameters of the system to be assessed for risk

[0153] Including bus voltage parameters, equivalent power output power (such as generator sets, reactive power compensation devices, tie lines between grids, etc.), load power, transmission line impedance parameters and failure rate parameters, and transformer parameters. Among them: define transmission lines, cables, transformers, and transmission equipment connecting two buses as "branches"; collectively refer to power system equivalent power points, branches, and loads as "elements"; define all buses in the power system as "nodes" ".

[0154] (2) Determine the variation range of each load node load: each load growth factor is in [70%, K Lk ] The interval obeys the uniform distribution

[0155] 1) The upper limit of the load variation rang...

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Abstract

The invention relates to a power system voltage stability risk assessment method, and in particular relates to a power system voltage stability risk assessment method capable of considering load fluctuation limit, aiming at solving the problem that the existing voltage stability assessment is single in point of view. According to the method, a probabilistic power flow simulation method of Latin hypercube sampling is applied to voltage stability analysis of a power system, and the situation of system crash caused by load power radical change and system network framework structure change can be studied. The voltage risk index, load node type risk index, network load bearing capacity risk index and financial loss risk index are taken as basis, and the voltage stability of the system is comprehensively analyzed by the multiple indexes from multiple points of view, so that the nodes with weak voltage in the system, the nodes with weak load fluctuation, the range of load bearing capacity of the system and the nodes with high financial loss risk in the system can be found. The power system voltage stability risk assessment method provides powerful basis for carrying out voltage monitoring, load monitoring, network planning and economic evaluation on the power system.

Description

technical field [0001] The invention relates to a method for evaluating the risk of voltage stability of a power system, in particular to a method for evaluating the risk of voltage stability of a power system considering load fluctuation limits. Background technique [0002] In recent years, the voltage collapse accidents of power systems in the world have occurred frequently, resulting in large-scale power outages, which not only bring huge economic losses to the power sector and other power industries, but also greatly affect the normal life of the people. [0003] The occurrence of voltage instability accidents is sudden and concealed. It is difficult to detect at the initial stage, and emergency measures cannot be taken in time. When voltage instability leads to voltage collapse, it is difficult to recover. It takes several hours, even more than ten hours, to restore normal power supply, which causes huge economic losses and social impact. [0004] Therefore, it is of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06F19/00
CPCH02J3/00H02J2203/20
Inventor 秦文萍任琛韩肖清王鹏贾燕冰梁琛任春光许进
Owner TAIYUAN UNIV OF TECH
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