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Interactive multilevel decision method of comprehensive evaluation in power quality based on cloud model

A technology for power quality and comprehensive evaluation, applied in the fields of instruments, data processing applications, calculations, etc., can solve the problems of complicated calculation, large evaluation sample size, failure to completely eliminate subjective factors, etc., and achieve an objective and more scientific evaluation conclusion. Effect

Inactive Publication Date: 2014-09-10
STATE GRID CORP OF CHINA +2
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Problems solved by technology

Among them, the evaluation method based on fuzzy mathematics can well reflect the fuzzy characteristics of the power quality index, but it cannot completely eliminate the subjective factors when constructing the membership degree problem, which affects the objectivity of the method to a certain extent
The comprehensive evaluation method of power quality based on probability theory, although the combination of probability statistics and fuzzy mathematics overcomes the subjectivity of the membership function to a certain extent, but its accuracy has a high probability that it will vary with the selection of the index reference value. change with change
The evaluation method based on the intelligent algorithm, although the modeling is simple, usually requires a large evaluation sample size, and the calculation is very cumbersome.

Method used

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  • Interactive multilevel decision method of comprehensive evaluation in power quality based on cloud model
  • Interactive multilevel decision method of comprehensive evaluation in power quality based on cloud model

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Embodiment Construction

[0019] Such as figure 2 As shown, the multi-level interactive decision-making method for comprehensive evaluation of power quality based on the cloud model includes the following steps: Step 1, establish a standard cloud model for comprehensive evaluation indicators, based on the characteristics of the cloud model, according to the fuzzy The characteristics of randomness and randomness transform qualitative indicators into quantitative interval expressions to form a normal cloud model of index levels;

[0020] The normal cloud model can be expressed as (Ex, En, He). Among them: Ex represents the distribution center of the cloud, which is the point value that can best represent the concept of the level boundary of power quality; En is the measure of the uncertainty of the attribute concept, on the one hand, it describes the randomness of sample data collected in the process of power quality evaluation, and on the other hand On the one hand, it depicts the ambiguity of the ran...

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Abstract

The invention discloses an interactive multilevel decision method of a comprehensive evaluation in power quality based on a cloud model. By using the cloud model, fuzziness and randomness are integrated together to constitute a mapping between qualitative and quantitative factors, and as a basis of information expression, the feature tallies with fuzziness and randomness of power quality grades. Subjectivity and objectivity can be well unified by an improved interactive multilevel decision model. Through combination of subjectivity and objectivity, a new comprehensive evaluation method of power quality based on the cloud model and the interactive decision is formed to achieve a more accurate, more objective and more scientific evaluation conclusion.

Description

technical field [0001] The invention relates to comprehensive evaluation of power quality problems, in particular to a multi-level interactive decision-making method for comprehensive evaluation of power quality based on a cloud model. Background technique [0002] With the gradual development of the power system, the impact of power quality on both power supply and power consumption is becoming more and more important. The use of comprehensive evaluation of power quality to evaluate the quality of power has laid a foundation for improving power quality. This field has a relatively long research history, and has achieved a lot of research results. [0003] The existing research methods for comprehensive evaluation of power quality can be roughly divided into three categories based on fuzzy mathematics, based on probability theory, and based on intelligent algorithms. Among them, the evaluation method based on fuzzy mathematics can well reflect the fuzzy characteristics of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q50/06
Inventor 李琼林刘书铭代双寅张博唐钰政李庚银周明许雯旸索之闻
Owner STATE GRID CORP OF CHINA
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