10kv distribution network harmonic source identification method based on time sequence relevancy
A technology of time series and identification method, which is applied in the field of harmonic sources of 10kV distribution network, can solve the problems of difficult identification and location of harmonic sources, and achieve the effect of facilitating supervision
Active Publication Date: 2013-12-04
SOUTH CHINA UNIV OF TECH
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[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, aiming at the situation that there are many distribution network feeders and the identification and location of harmonic sourc
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[0056] The present invention will be further described below in conjunction with specific examples.
[0057] Such as figure 1 As shown, it is an electrical wiring diagram of the present invention, illustrating a practical application scenario. Such as figure 2As shown, it is a simplified diagram of the flow of harmonic current in the present invention. It can be known from practical experience that in the case of no resonance, the impedance of the feeder is much larger than the system impedance of the transformer branch, so the flow of harmonic current is as follows: figure 2 shown. Such as image 3 Shown is the equivalent circuit diagram of the present invention, as can be seen from the equivalent circuit diagram, the harmonic current at the common connection point PCC place is the sum of each harmonic current of the harmonic source, that is:
[0058] I pcch = I h1 +I h2 +...I hn
[0059] Therefore, if the fundamental current amplitude of a feeder is higher and the...
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The invention discloses a 10kV distribution network harmonic source identification method based on time sequence relevancy. The technical scheme includes that the total harmonic distortion rate of current serves as one group of time sequences, and the time sequences include a trend component, a volatility component and a random component. The method includes the steps: firstly, calculating the trend component of the total harmonic distortion rate of the harmonic current by a secondary sliding average method; secondly, solving the volatility component in the total harmonic distortion rate of the current by the aid of historical data and values of the trend component, performing weighted averaging on the solved volatility component and removing the effect of the random component to obtain a volatility index; thirdly, respectively solving relevancy between the trend component of each feeder line and the trend component of a bus and relevancy between the volatility index of each feeder line and the volatility index of the bus by a relevancy analysis method; finally, solving the suspicion degree of a total harmonic source of each feeder line according to harmonic current data. The method cannot be limited by other conditions according to change rules of harmonic data, and harmonic source circuits can be rapidly identified.
Description
technical field [0001] The invention relates to the technical field of harmonic sources of 10kV distribution network, in particular to a method for identifying harmonic sources of 10kV distribution network based on time series correlation, which is used to solve the problem of identifying harmonic sources of many feeders in distribution network. Background technique [0002] With the input of a large number of nonlinear loads, the management and control of harmonics is becoming more and more important. The harmonic source in the distribution network interferes with other feeders by injecting harmonic current into the busbar. This effect has certain regularity, but it also has certain random fluctuations, and it also has long-term and secret characteristics, resulting in Difficulties in dividing and managing harmonic responsibilities. At present, there are a large number of intelligent monitoring terminals installed in the power grid, and a large amount of harmonic monitorin...
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Inventor 黄瑞艺欧阳森冯天瑞
Owner SOUTH CHINA UNIV OF TECH