Measuring method for equivalent system harmonic impedance of feeder line in power distribution network

An equivalent system and harmonic impedance technology, applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve inaccurate harmonic responsibility, harmonic impedance error, large background harmonic fluctuations, etc. question

Active Publication Date: 2016-06-15
SOUTHEAST UNIV
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Problems solved by technology

When the harmonic test is located on a certain feeder line, the background harmonics of the system side fluctuate greatly, and the use of the "non-interventi

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  • Measuring method for equivalent system harmonic impedance of feeder line in power distribution network
  • Measuring method for equivalent system harmonic impedance of feeder line in power distribution network
  • Measuring method for equivalent system harmonic impedance of feeder line in power distribution network

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Embodiment Construction

[0088] The technical solutions of the embodiments of the present invention will be further described below in combination with examples and accompanying drawings.

[0089] Such as figure 1 As shown, the embodiment of the present invention provides a method for measuring the equivalent system harmonic impedance of a distribution network feeder, the method comprising the following steps:

[0090] Step 10) acquiring harmonic test data to form a harmonic data group;

[0091] Step 20) performing data preprocessing: performing data preprocessing on the harmonic test data obtained in step 10) to obtain harmonic difference data;

[0092] Step 30) screening the harmonic data: based on the harmonic difference data in the step 20), use the Neir test method to screen out the sample data group;

[0093] Step 40) Calculate the equivalent system harmonic impedance: delete the abnormal data in the harmonic voltage difference data through the quotient of the normalization coefficient in the ...

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Abstract

The invention discloses a measuring method for equivalent system harmonic impedance of a feeder line in a power distribution network. The method comprises the following steps: 10) obtaining harmonic test data and forming a harmonic data group; 20) carrying out data pre-processing: carrying out data pre-processing on the harmonic test data obtained in the step 10) to obtain harmonic difference data; 30) screening the harmonic data: screening a sample data group through a Nair detection method based on the harmonic difference data obtained in the step 20); and 40) calculating the equivalent system harmonic impedance: according to the ratio of standardized coefficients in the sample data, deleting abnormal data in harmonic voltage difference data, and calculating the equivalent system harmonic impedance by utilizing the retained harmonic voltage difference data. The method is targeted for the feeder line in a substation, can accurately calculate the equivalent system harmonic impedance value of the test feeder line, and is helpful for carrying out quantitative analysis on harmonic pollution caused by the feeder line to the system.

Description

technical field [0001] The invention belongs to the technical field of power quality monitoring and analysis, and specifically relates to a method for measuring the equivalent system harmonic impedance of a distribution network feeder. Background technique [0002] With the development of power electronic technology, various power electronic devices such as inverters, rectifiers and various switching power supplies are widely used. The switching action of these devices injects a large number of harmonic components into the grid, resulting in serious distortion of the voltage and current waveforms in the grid. At the same time, other nonlinear loads such as electric arc furnaces and electric welding machines in the power system have impact and unbalanced power consumption characteristics. While absorbing the fundamental power supplied by the system, they also convert part of the fundamental power into harmonic power and become the harmonic source of the power grid. Harmonic...

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Application Information

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IPC IPC(8): G01R27/08
CPCG01R27/08
Inventor 顾伟邱海峰王旭冲储佳伟
Owner SOUTHEAST UNIV
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