Transient voltage instability and power angle instability identification method based on transient energy function

A transient energy function, transient voltage technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of simple and rough model structure, not fully considering the influence of transient instability of the power grid, and complicated operation, etc. Reasonable effect of transient power-angle relation function and transient voltage relation function

Active Publication Date: 2020-12-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] Traditional transient instability identification methods can usually only identify a single instability mode. In order to identify multiple instability modes, it is necessary to combine multiple methods for identification at the same time, and the operation is

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  • Transient voltage instability and power angle instability identification method based on transient energy function
  • Transient voltage instability and power angle instability identification method based on transient energy function
  • Transient voltage instability and power angle instability identification method based on transient energy function

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Embodiment

[0037] In order to better illustrate the technical solution of the present invention, first, a brief description is given of the derivation process of the transient relationship function on which the present invention is based.

[0038] For a multi-machine power system configured with n nodes (including m generators), according to Kirchhoff's current law, the bus current equation can be expressed as:

[0039] Y B u B -I G +I L =0

[0040] Among them: Y B , U B , I G and I L are the system admittance matrix, the bus node voltage, the current phasor injected by the generator into the node, and the node load current, respectively. Divide Y B Except for the n-order square matrix, the rest are n-dimensional column vectors.

[0041] The energy function of the system can be obtained by performing complex line integration on the bus current equation and rewriting it as a summation formula:

[0042]

[0043] Among them, Y ij Denotes the admittance between node i and node...

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Abstract

The invention discloses a transient voltage instability and power angle instability identification method based on a transient energy function. The method comprises the following steps: firstly obtaining an admittance matrix of a system node, periodically collecting the operation parameters of a power system in an operation process, and if it is judged that the current power system is unstable according to the operation parameters, substituting the current operating parameters into a transient power angle relation function and a transient voltage relation function which are constructed based on the transient energy function, then calculating to obtain a sensitivity function, and then identifying a transient instability mode of the system in combination with the instability state of the system. The transient power angle relation function and the transient voltage relation function are provided based on a transient energy function method, and discrimination of different instability modesis realized by establishing sensitivity function indexes.

Description

technical field [0001] The invention belongs to the technical field of power system transient stability, and more specifically relates to a method for identifying transient voltage instability and power angle instability based on a transient energy function. Background technique [0002] In recent years, with the continuous development of smart grids, the continuous enrichment and popularization of electrical appliances such as smart homes, and the continuous exploration of power electronics and other equipment connected to the grid, people's electricity demand has become more diversified and personalized, and more and more More and more new elements and new technologies are added to the power grid, forming a more complex and huge system system. Therefore, the analysis and research of the power system pursues the real-time grasp of changes in details and the comprehensive consideration of the characteristics of all aspects of the system. The evaluation and identification of ...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/10H02J2203/20
Inventor 刘群英霍欣莉胡凤凯李博文章凡衡一佳朱德清蔡茂杰柴鑫
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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