Electric power system static voltage stability evaluation method based on improved AdaBoost

A static voltage stability and power system technology, applied in the direction of instruments, character and pattern recognition, data processing applications, etc., can solve the problems of insufficient evaluation accuracy, inability to meet actual use needs, and low efficiency, so as to reduce dimensions and improve learning ability and generalization ability, the effect of reducing the time required

Active Publication Date: 2020-07-10
CHINA THREE GORGES UNIV
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  • Application Information

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Problems solved by technology

However, this technology has the problems of insufficient evaluation accuracy and low efficiency in the static voltage stability evaluation of the power system, and cannot meet the needs of actual use.

Method used

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  • Electric power system static voltage stability evaluation method based on improved AdaBoost
  • Electric power system static voltage stability evaluation method based on improved AdaBoost
  • Electric power system static voltage stability evaluation method based on improved AdaBoost

Examples

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Embodiment

[0103] The present invention has been tested in IEEE 30 node system and IEEE 50 machine system respectively. Among them, the IEEE 30-node system includes 30 nodes, 6 generators and 41 transmission lines; the IEEE 50-machine system includes 50 generators, 145 busbars and 453 transmission lines. The simulation software uses PSS / E to simulate a three-phase short-circuit fault, and the fault removal time is 1 second. 5000 samples were generated in the IEEE30-node system and 8000 samples were generated in the IEEE50-machine system. 80% of the samples generated by each system are used for training and the remaining 20% ​​are used for testing. All tests were performed on a computer with an Intel Core i7 processor and 8GB of RAM.

[0104] Accuracy rate (A cc ) and F 1 value to evaluate the performance of the model, F 1 is the accuracy rate (P re ) and recall (R ec ) of the harmonic mean, whose magnitude is determined by P re and R ec decided together. A cc and F 1 As shown...

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Abstract

The invention discloses an electric power system static voltage stability evaluation method based on improved AdaBoost. The method comprises the steps: 1, constructing an initial data set containing electric power system operation variables and voltage stability safety classification labels; 2, forming an efficient data set; 3, based on the efficient data set, combining with an improved AdaBoost algorithm to construct a power system voltage stability evaluation model, and using the efficient data set to perform offline training and updating on the VSA model; 4, based on the real-time measurement data collected by the synchronous phasor measurement unit, performing online VSA on the power system by using the VSA model. The method is strong in generalization ability and high in classification accuracy, can effectively avoid the occurrence of an over-fitting phenomenon, and can carry out reliable on-line safety evaluation on the power system.

Description

technical field [0001] The invention relates to the field of static voltage stability evaluation of electric power system, in particular to a static voltage stability evaluation method of electric power system based on improved AdaBoost. Background technique [0002] Voltage stability assessment (Voltage Stability Assessment, VSA) is a method to prevent voltage instability when the power system safety margin is insufficient. With increasing loads and wide-area interconnection of power grids, modern power systems are operating ever closer to system limits. Over the past few decades, severe outages related to voltage collapses have occurred with increasing frequency. Therefore, an effective tool is needed to perform safe and reliable VSA on the power system to reduce accident losses. [0003] The key of VSA is to determine the distance between the current voltage operating point and the voltage limit point. There are many methods for calculating the voltage limit point, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/27G06K9/62G06Q10/06G06Q50/06
CPCG06Q10/06393G06Q50/06G06F18/2148G06F18/24
Inventor 刘颂凯晏光辉刘炼陈浩薛田良张磊叶婧钟浩鲍刚李世春杨苗杨超黎丽丽
Owner CHINA THREE GORGES UNIV
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