A Modeling Method for Power System Transient Stability Assessment

A technology of transient stability evaluation and modeling method, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., and can solve the problems that the dynamic characteristic evolution information of the intermediate process is not applied and affects the reliability of the final evaluation result, etc.

Active Publication Date: 2019-07-09
CHINA ELECTRIC POWER RES INST +3
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Problems solved by technology

The existing research work is limited to the above-mentioned traditional two-dimensional modeling ideas. When determining the input characteristic variables, most of the operating status at a specific time (such as the time of fault occurrence and the time of fault removal) is considered, and a large number of dynamic characteristics of the intermediate process evolve The information was not applied, which greatly affected the reliability of the final assessment results

Method used

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  • A Modeling Method for Power System Transient Stability Assessment
  • A Modeling Method for Power System Transient Stability Assessment
  • A Modeling Method for Power System Transient Stability Assessment

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Embodiment

[0179] Taking the New England 10-machine 39-node system as an example to illustrate the effectiveness of the power system transient stability rapid assessment modeling method proposed in the present invention. The number of generators in the power system is m=10, the reference frequency is 60Hz, the sampling period Δt=0.0167s, and the simulation software uses PSASP.

[0180] 1) Set single-phase short-circuit, two-phase short-circuit, two-phase-to-ground short-circuit and three-phase short-circuit in sequence on the line, select the trajectory data within 9 cycles after the fault is removed, that is, n=9, and generate s=4104 kinds of work In this case, the trajectories of all generator rotor angle faults are removed, and the initial acquisition data model is obtained.

[0181] 2) Calculate the corresponding generator relative rotor angle relative rotor angular velocity and the relative rotor angular acceleration where i=1,2,...,10; j=1,2,...,9; k=1,2,...,4104.

[0182] 3...

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Abstract

The invention provides a modeling method for power system transient state stability assessment. The method includes the following steps that power generator track information and a transient state calculation result are collected; a feature value of a power generator is calculated; an initial mathematic model X and a transient state stability assessment mathematic model F are formed; dimensionality reduction is conducted on the transient state stability assessment mathematic model F to obtain a two-dimensional standard mathematic model D. Multidimensional counting is conducted on power generator track curves, a statistic curve can reflect main mean values, change ranges and change rate features of each track curve, statistic features are irrelevant to the scale of a system, the dimensionality curse problem caused by increasing of an analysis system in the data modeling process can be effectively avoided, and meanwhile adverse of power generator information loss on calculation can be reduced to the largest extent.

Description

technical field [0001] The invention relates to a modeling method, in particular to a modeling method for power system transient stability evaluation. Background technique [0002] The transient stability assessment based on machine learning treats the transient stability assessment problem as a two-mode classification problem, that is, the operating state of the system is divided into two categories: stable and unstable; by selecting a suitable set of features to describe the system state, sample the characteristic data samples of the power system under different operating conditions, and establish a high-dimensional input space; then, use an appropriate classification method to classify the samples, and its mathematical model is as follows figure 1 . [0003] In transient stability assessment, it is very difficult to construct a mathematical model for assessment and select input characteristic variables that are universally applicable and can fully describe the dynamic es...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 于之虹吴俊勇周艳真冀鲁豫郝亮亮才洪全边二曼华科黄彦浩史东宇鲁广明
Owner CHINA ELECTRIC POWER RES INST
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