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System for monitoring state of harmonic load

A load status and monitoring system technology, applied in the direction of measuring devices, measuring electrical variables, effective value measurement, etc., can solve problems such as difficult to judge the overall change of data, difficult to meet the requirements of data change trends, etc., and achieve high engineering practical value Effect

Active Publication Date: 2012-01-18
SICHUAN UNIV +1
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  • Abstract
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  • Application Information

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Problems solved by technology

The change of the actual measurement data of the power quality monitoring network can reflect the change of the operating state of the harmonic load. Since there are many factors affecting the operating state of the harmonic load, such as weather conditions, user needs, natural disasters, etc., these factors are full of ambiguity and Randomness, so the high-order moments of the data are used to evaluate the quality of the data, it is difficult to judge the overall change of the data, and it is even more difficult to meet the requirements of the data change trend under the daily sample combination relationship within a period of time

Method used

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  • System for monitoring state of harmonic load
  • System for monitoring state of harmonic load
  • System for monitoring state of harmonic load

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Embodiment Construction

[0037] The inventive method adopts the following technologies.

[0038] 1. Cloud model

[0039] 1) Definition of cloud and cloud droplet

[0040] Suppose U is a quantitative universe represented by numerical values, and C is a qualitative concept on U. If the quantitative value x∈U is a random realization of the qualitative concept C, the degree of certainty of x to C μ(x)∈[0,1 ] is a random number with a tendency to be stable, μ: U→[0, 1], x→μ(x), then the distribution of x on the domain of discourse U is called a cloud, denoted as C(X). Each x is called a cloud droplet.

[0041] 2) The basic nature of the cloud

[0042] (1) The universe of discourse U can be one-dimensional or multi-dimensional;

[0043] (2) The random realization mentioned in the definition is the realization in the sense of probability; the degree of certainty mentioned in the definition is the degree of membership in the sense of fuzzy set, and it also has the distribution in the sense of probabilit...

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Abstract

The invention aims to provide a system for monitoring the state of a harmonic load. The system is realized by a following method as follows: an everyday sample is established according to statistic characteristic quantity of historical data corresponding to the effective value of every-order harmonic current; a population sample in any time period is established according to the everyday sample; a normal cloud model of the effective value of the every-order harmonic current is established and converted to the boundary membership under a standard normal cloud model according to the statistic rule of the population sample, so as to establish a retrieval body of the harmonic current. By the system, the state of the harmonic load can be diagnosed and minored in real time according to the retrieval body of the harmonic current; the system is applicable to the occasion when the running state is abnormally small; and the method has a certain practical value in engineering.

Description

technical field [0001] The invention relates to a monitoring point and various harmonic currents used for quickly diagnosing abnormal harmonic load operating states according to a harmonic current retrieval body; at the same time, the harmonic current of a certain harmonic load monitoring point is monitored in real time and an abnormal warning is issued. Background technique [0002] In recent years, more and more harmonic loads are connected to the power grid, and the harmonic currents generated by them have caused increasingly serious problems to the operation of the power grid; in order to ensure the safe and reliable operation of the power grid and provide power users with high-quality power quality, harmonic The status monitoring of the wave load is particularly important. The status monitoring of the harmonic load refers to judging whether the harmonic current exceeds the abnormal range based on the real-time monitoring data of the harmonic load and the monitoring infor...

Claims

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Application Information

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IPC IPC(8): G01R19/02G01R19/165
Inventor 杨洪耕胡灿谢康叶茂清杨华
Owner SICHUAN UNIV
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