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Measurement and calculation method of harmonic impedance of power system

A technology of harmonic impedance and calculation method, which is applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., to achieve the effect of increasing robustness and reducing influence

Inactive Publication Date: 2016-05-18
STATE GRID CORP OF CHINA +1
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Problems solved by technology

This processing method ignores that the phasor exists as a whole with a specific physical meaning, and its solution process is not a simple addition and combination of real and imaginary parts.

Method used

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  • Measurement and calculation method of harmonic impedance of power system
  • Measurement and calculation method of harmonic impedance of power system
  • Measurement and calculation method of harmonic impedance of power system

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not as a limitation to the present invention.

[0029] Such as figure 1 , figure 2 A method for measuring and calculating the harmonic impedance of a power system shown comprises the following steps:

[0030] Step 1: Collect the instantaneous value of the bus voltage at the common connection point and the instantaneous value of the current injected by the user into the system, obtain the harmonic voltage and harmonic current phasor data sequence through Fourier transform, and establish the harmonic voltage and harmonic current phasor The multiple regression equation;

[0031] Step 2: Preliminary screening of the harmonic voltage and harmonic current phasor data sequences obtained in step 1 to exclude the influence of abnormal points on the regression coefficie...

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Abstract

The invention discloses a measurement and calculation method of harmonic impedance of a power system. A complex least square method is introduced into harmonic impedance calculation of a power system and the phasor real and imaginary parts like a measured voltage and a measured current and the like are used as an organic integrated part to carry out calculation, so that an optimized least square solution is obtained. According to the invention, the data processing process is introduced and original data are screened by using a relative-complex-residual-sorting-based method, so that the influence on a regression coefficient by an abnormal point can be effectively eliminated. On the basis of screening of the original data, circulated regressive calculation is carried out by employing a complex field repeated weighting method, so that the influence on the regression coefficient by the strong influence point can be effectively reduced and the regression robustness is enhanced.

Description

technical field [0001] The invention relates to the design field of harmonic impedance calculation methods, in particular to a method for measuring and calculating harmonic impedance of a power system. Background technique [0002] Power system harmonic impedance is very important for power system status assessment and the design of new power equipment, and plays an indispensable role in power system modeling, simulation and configuration of power devices such as line protection. At the same time, with the development of power electronic technology at home and abroad, a large number of electrical equipment with nonlinear characteristics composed of power electronic switches are widely used in metallurgy, steel, transportation, chemical industry and other demand fields, such as electrolysis devices, electric locomotives, rolling mills, etc. Harmonic problems in the power system are increasingly serious, such as harmonic power flow calculation, harmonic responsibility division...

Claims

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Application Information

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IPC IPC(8): G01R27/08
Inventor 窦征魏华南褚玉杰王天啸任琳琳
Owner STATE GRID CORP OF CHINA
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