Comprehensive evaluation method based on multi-stress for electric energy quality of monitoring points of electrified railway

A technology for electrified railways and power quality, applied in electrical components, circuit devices, AC network circuits, etc., and can solve problems such as increasing the complexity of problem analysis

Active Publication Date: 2013-04-03
ELECTRIC POWER RES INST OF STATE GRID ANHUI ELECTRIC POWER
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Problems solved by technology

However, each individual power quality index is only proposed for a single or part of the power quality, and the correlation between each individual power quality index is very high. When performing a comprehensive analysis, the complexity

Method used

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  • Comprehensive evaluation method based on multi-stress for electric energy quality of monitoring points of electrified railway
  • Comprehensive evaluation method based on multi-stress for electric energy quality of monitoring points of electrified railway
  • Comprehensive evaluation method based on multi-stress for electric energy quality of monitoring points of electrified railway

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Embodiment Construction

[0033] In the present embodiment, the overall evaluation method of power quality of electrified railway monitoring points based on comprehensive factors is carried out as follows:

[0034] 1. Establish a single power quality index description system and a power quality comprehensive factor description system according to the following steps;

[0035] 1. Based on relevant standards, establish a single power quality description system x, x=[x 1 ,x 2 ,...,x p ], where x 1 ,x 2 ,...,x p It is a description of each individual power quality, and each individual power quality includes:

[0036] Short circuit ratio reciprocal R' sce , R' sce =S equ / S sc In the formula, S equ is the equipment capacity, S sc is the short-circuit capacity at the monitoring point;

[0037] Harmonic indicators, including current total harmonic distortion THD used in the national standard GB / T 14549-93 i and voltage total harmonic distortion THD u ;Define the average percentage of harmonic cu...

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Abstract

The invention discloses a comprehensive evaluation method based on multi-stress for the electric energy quality of monitoring points of an electrified railway. The comprehensive evaluation method is characterized by comprising the following steps of: firstly establishing a single electric energy quality index description system and an electric energy quality multi-stress description system; and then calculating the score of electric energy quality multi-stress of each monitoring point, sorting the electric energy quality of each monitoring point according to the size of the synthesis score of the electric energy quality of each monitoring point by taking a variance contribution rate of each electric energy quality multi-stress as a weight for calculating a synthesis score of the electric energy quality of the monitoring points, simultaneously, classifying all the monitoring points by adopting a fuzzy C mean value clustering method according to the need of sorting management, and carrying out category classification on the monitoring points. According to the comprehensive evaluation method, the overall sorting and clustering of the electric energy quality condition of the monitoring points of the electrified railway are realized, and references and basis are provided for the unified management and deep planning management of electric energy quality.

Description

technical field [0001] The invention relates to an overall evaluation method of power quality, which is used for comprehensively evaluating the power quality status of electrified railway monitoring points, and belongs to the field of power system power quality. Background technique [0002] In recent years, my country's electrified railways have developed rapidly. It is planned that by 2020, the national railway operating mileage will reach more than 120,000 kilometers, the electrification rate will reach more than 60%, and railway construction will enter the peak period of the fastest development in Chinese history. [0003] With the rapid development of electrified railway, its pollution to the power quality of power system has become a problem that cannot be ignored. At the same time, more and more new loads in the power grid have higher and higher requirements on the power quality of the power grid, making the development of electrified railways must be a common, harmo...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/01
CPCY02E40/40
Inventor 计长安罗亚桥徐斌洪伟桂国亮郑国强胡翀
Owner ELECTRIC POWER RES INST OF STATE GRID ANHUI ELECTRIC POWER
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