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Harmonic responsibility division method and system

A responsibility and harmonic technology, applied in the field of harmonic responsibility division methods and systems, can solve problems such as the inability to reflect the changing characteristics of harmonic voltages and harmonic currents, the inability to eliminate the influence of background harmonic fluctuations, and the large deviations. The accuracy of division, the reduction of calculation deviation, and the good stability

Active Publication Date: 2017-11-03
GUANGZHOU POWER SUPPLY CO LTD +1
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AI Technical Summary

Problems solved by technology

[0003] Most of the traditional harmonic responsibility division methods are based on the definition of harmonic responsibility, which is calculated by the average value of the measured harmonic voltage and harmonic current. Large, and cannot reflect the change characteristics of harmonic voltage and harmonic current, and cannot eliminate the impact of background harmonic fluctuations
The traditional harmonic responsibility division method has the disadvantage of low accuracy

Method used

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  • Harmonic responsibility division method and system
  • Harmonic responsibility division method and system
  • Harmonic responsibility division method and system

Examples

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Embodiment Construction

[0021] A method for division of harmonic responsibilities such as figure 1 shown, including the following steps:

[0022] Step S110: collecting the harmonic voltage data of the bus and the harmonic current data of the harmonic source to be sought on the feeder.

[0023] Specifically, data collection can be carried out through voltmeters and ammeters. Collect the hth harmonic voltage data at bus X and the hth harmonic current data of the harmonic source to be sought on the feeder Where N is the number of sampling points.

[0024] Step S120: According to the harmonic voltage data and harmonic current data, the background harmonic impedance is calculated using the dominant fluctuation method.

[0025] In one of the examples, as figure 2 As shown, step S120 includes step S121 to step S126.

[0026] Step S121: Calculate the harmonic voltage fluctuation amount and the harmonic current fluctuation amount. Specifically:

[0027]

[0028] Among them, N is the number of sa...

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Abstract

The present invention relates to a harmonic responsibility division method and system, which collects the harmonic voltage data of the busbar and the harmonic current data of the harmonic source to be obtained on the feeder line; according to the harmonic voltage data and harmonic current data, utilizes the dominant fluctuation amount Calculate the background harmonic impedance using the method; according to the harmonic voltage data, harmonic current data and background harmonic impedance, use the quantile regression method to divide the harmonic responsibility of the harmonic source to be obtained. Use the dominant fluctuation method to estimate the background harmonic impedance, and filter out the dominant fluctuation to calculate the background harmonic impedance, thereby effectively suppressing the influence of background harmonics and measurement noise fluctuations on the background harmonic impedance estimation results, and accurately calculating the background Harmonic impedance; then obtain the background harmonic current according to the background harmonic impedance, and perform quantile regression to obtain the harmonic responsibility of the harmonic source. The calculation deviation caused by the background harmonic fluctuation can be reduced, the division accuracy is improved, and the stability is good, and the data utilization rate is high.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a harmonic responsibility division method and system. Background technique [0002] With the development of modern power electronics technology, more and more non-linear devices are connected to the power grid, injecting a large number of harmonics into the power grid, causing voltage distortion, leading to the deteriorating power quality of the power grid, which greatly affects the The stable and safe operation of the power grid. Therefore, in order to provide users with safe and reliable electric energy, it is first necessary to clarify the responsibilities of users of each harmonic source, and to punish users of harmonic injection. [0003] Most of the traditional harmonic responsibility division methods are based on the definition of harmonic responsibility, which is calculated by the average value of the measured harmonic voltage and harmonic current. Large, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
Inventor 许中陆国俊陈静杨源马智远臧天磊栾乐黄裕春
Owner GUANGZHOU POWER SUPPLY CO LTD
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