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Model-data hybrid driven power system transient stability online evaluation method

A power system, hybrid drive technology, applied in data processing applications, instruments, computing, etc., can solve problems such as low generalization ability, inability to guarantee the accuracy of analysis and evaluation results, and inexplicability

Pending Publication Date: 2022-08-09
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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  • Application Information

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Problems solved by technology

However, in the application of data-driven methods, there are also shortcomings in the analysis and evaluation results that cannot guarantee the accuracy, are uninterpretable, and have low generalization ability.

Method used

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  • Model-data hybrid driven power system transient stability online evaluation method
  • Model-data hybrid driven power system transient stability online evaluation method
  • Model-data hybrid driven power system transient stability online evaluation method

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Embodiment Construction

[0050] The present invention will be further described below with reference to specific embodiments (that is, taking the New England 10-machine 39-node power system as an example).

[0051] refer to figure 1 shown, figure 1 This is the overall flow chart of the model-data hybrid-driven (two-stage) power system transient stability on-line evaluation method of the present invention. The described model-data hybrid-driven power system transient stability assessment method includes the following steps:

[0052] Step 1: In the data-driven stage, for the New England 10-machine 39-node power system, a sample data set is generated by the Monte Carlo method, and the load level on each bus is set to vary randomly between ±20% of the reference value, set The fault types are three-phase short-circuit ground fault, two-phase short-circuit ground fault, two-phase-phase-to-phase short-circuit fault and single-phase short-circuit ground fault, and the fault duration is set to obey a normal ...

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Abstract

The invention belongs to the field of power system transient stability evaluation, and particularly relates to a model-data hybrid driven power system transient stability online evaluation method. In the data driving stage, for a certain to-be-evaluated power system, data such as the load level, the network structure and the fault set are collected, and a sample data set is generated through a time domain simulation method. Two data driving methods are respectively adopted to judge the transient stability of the system. A Sigmoid function is introduced to evaluate the credibility of prediction results made by the two data driving methods, and a conditional discriminant capable of quantifying the credibility of a transient stability evaluation result output in a data driving stage is provided. In the model driving stage, a kinetic energy change rate method is adopted to calculate critical clearing time so as to judge the transient stability of the system. According to the provided credibility condition discriminant, when the credibility of the output result of the data driving stage meets the requirement, the output result is used as a final output result; otherwise, switching to a model driving stage to perform transient stability evaluation.

Description

technical field [0001] The invention belongs to the field of power system transient stability evaluation, and in particular relates to a model-data hybrid drive power system transient stability online evaluation method. Background technique [0002] On-line assessment of power system transient stability is the basis for ensuring the safe operation of power systems. In recent years, the large-scale grid connection of a high proportion of renewable energy has exacerbated the complexity of the power system, making the online assessment of the transient stability of the power system face new challenges. [0003] The existing power system transient stability assessment methods are mainly divided into two categories: model-driven methods and data-driven methods. The model-driven method firstly establishes a mechanism model described by differential-algebraic equations according to the physical characteristics such as the topology structure and parameter characteristics of the pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/06393G06Q50/06Y02E60/00
Inventor 程雪婷曲莹张颖赵兴泉孟涛王金浩郝鑫杰贺卫华郝捷张超王玮茹陈丹阳
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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