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Extra-high voltage main transformer tap selection method and device based on optimal combination weight

An optimal combination and tap technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as difficulty in gear selection

Pending Publication Date: 2020-10-02
国家电网有限公司华北分部 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the deficiencies in the prior art, the present invention provides a UHV main transformer tap selection method based on the optimal combination weight, which solves the difficulty in gear selection without UHV main transformer taps in the prior art question

Method used

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  • Extra-high voltage main transformer tap selection method and device based on optimal combination weight
  • Extra-high voltage main transformer tap selection method and device based on optimal combination weight
  • Extra-high voltage main transformer tap selection method and device based on optimal combination weight

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Embodiment 1

[0116] In the evaluation system, the most important step is to determine the weight of the evaluation index, and there are many methods to determine the weight, including subjective methods, objective methods, commonly used methods to determine weights such as: G1 method, AHP, entropy weight method and Variation coefficient method, etc. Among them, G1 method and AHP are subjective methods, which can better introduce expert experience; entropy weight method and variation coefficient method are objective methods; entropy weight method can fully reflect the inherent characteristics of indicators according to the detection data of indicators The coefficient of variation method can also better combine the detected actual data to weight the indicators. However, each single method has its own advantages and disadvantages when it comes to determining indicator weights.

[0117] (a) The steps of the G1 method are as follows:

[0118] (1) Determine the importance order of the indicator...

Embodiment 2

[0182] The present invention verifies the correctness of the method based on the specific implementation cases of the power grid in the region, which mainly includes calculating the voltage qualification rate index and the average voltage fluctuation of the power grid in the region under different gear combinations of the main transformer taps of the two UHV stations in Hongshan and Beiyue. Value index, reactive power exchange sum index, solution parallel and empty charging voltage qualification rate index and static stability margin index. The specific implementation process is as follows:

[0183]Using PSD-BPA electromechanical transient simulation software, taking a power grid in northern China as an example, the correctness of the method is verified. In 2020, Beiyue and Hongshan 1000kV UHV substations will be built, and will be connected to North China Power Grid through Beiyue-Baoding, Hongshan-Xingtai UHV lines. After the UHV substations are put into operation, it will a...

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Abstract

The invention discloses an extra-high voltage main transformer tap selection method and device based on optimal combination weight. The method comprises determining evaluation indexes of extra-high voltage main transformer tap gear selection; solving subjective weights and objective weights of the evaluation indexes by adopting a subjective method and an objective method, and combining the subjective weights and the objective weights by utilizing a moment estimation theory to solve an optimal combined weight; and calculating evaluation results under each extra-high voltage main transformer tapgear by using the optimal combination weight and the evaluation index, sorting the evaluation results under the non-tap gears from large to small, and selecting the tap gear corresponding to the maximum value of the evaluation results as the optimal gear. The method and the device are of great significance to gear selection of the extra-high voltage main transformer tap.

Description

technical field [0001] The invention relates to a method for selecting an ultra-high voltage main transformer tap based on an optimal combination weight, and belongs to the technical field of power grid regulation of a power system. Background technique [0002] With the development of my country's economy, the social power consumption is increasing, and the distribution of power sources is uneven in the vast territory of my country, and the power load is concentrated in the central and eastern regions. [0003] The reliability of UHV transformers is an important factor for the stable and reliable operation of the system. The failure rate of on-load transformers is significantly higher than that of no-load transformers. Therefore, most UHV transformers are no-load transformers at present, and the load of the power grid varies with Seasonal and diurnal fluctuations, UHV main transformer taps need to be kept in a reasonable gear. [0004] Therefore, the gear selection of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06Q10/06G06Q50/06
CPCG06F30/20G06Q10/06393G06Q50/06
Inventor 李轶群赵伯铉张文朝訾鹏杨俊炜曾兵谭贝斯
Owner 国家电网有限公司华北分部