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Full-time-domain voltage stability synthesis assessment method

A voltage stability and comprehensive evaluation technology, applied in the direction of measuring current/voltage, measuring electricity, measuring electrical variables, etc. theoretical support, etc.

Active Publication Date: 2011-06-15
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This criterion lacks theoretical support and cannot truly reflect the transient voltage stability of the system.
[0007] Therefore, the existing voltage stability assessment methods cannot meet the needs of comprehensively assessing the grid voltage stability

Method used

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Embodiment Construction

[0064] Refer to the attached figure 1 An embodiment of the present invention is illustrated: the present invention has been applied to assess the voltage stability of Chongqing power grid, further described as follows:

[0065] Chongqing power grid is a large-scale urban power grid, so the requirements for power supply reliability are relatively high, and the corresponding voltage stability evaluation indicators are also relatively high.

[0066] 1) Static voltage stability evaluation

[0067] For this embodiment, calculate the load bus active power margin, reactive power margin and sub-areas of the grid under normal operation and normal maintenance mode, after the N-1 accident, after the N-2 accident, and after multiple serious accidents power margin. Compare the calculated results with the evaluation metrics.

[0068] 2) Evaluation of transient voltage stability

[0069] For this embodiment, calculate the minimum voltage and duration of the busbar in the transient proces...

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Abstract

The invention provides a full-time-domain voltage stability comprehensive evaluation method which can be used to evaluate various voltage stability problems. The method is a comprehensive voltage evaluation system, and the composition part of the system fully considers the short-term and long-term processes in the time domain of voltage stability, the small and big interferences on the disturbance degree, as well as the certainty and probability on the evaluation method. The method has good maneuverability and adaptability in evaluating the voltage stability in the power system and can meet the need of the overall voltage stability evaluation in the power system.

Description

technical field [0001] The invention relates to a comprehensive evaluation method for full-time domain voltage stability, which belongs to the fields of power system analysis and control and power system voltage stability evaluation. Background technique [0002] According to the dynamic characteristics of voltage instability, voltage stability problems can be divided into various types. For example, according to the definition of the International Conference on Large Power Grids, voltage stability can be divided into static voltage stability and dynamic voltage stability, and dynamic voltage stability is subdivided into For small disturbance voltage stability, transient voltage stability and medium and long-term voltage stability. Different types of voltage stability problems have different characteristics. To comprehensively evaluate the voltage stability of power systems, different evaluation methods should be adopted for different types of voltage stability problems. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R31/00
Inventor 马世英孙华东易俊
Owner CHINA ELECTRIC POWER RES INST
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