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Method for computing harmonic impedance of power system

A technology of harmonic impedance and calculation method, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc.

Active Publication Date: 2012-10-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for computing harmonic impedance of power system
  • Method for computing harmonic impedance of power system
  • Method for computing harmonic impedance of power system

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Embodiment Construction

[0035] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0036] figure 1 It is a schematic diagram of a system and user equivalent circuit of a method for calculating harmonic impedance of a power system provided by the present invention. figure 1 middle, is the equivalent h-order harmonic voltage source voltage on the system side (called the background harmonic voltage) except the user concerned, Z sh is the equivalent h harmonic impedance of the system side, is the equivalent h-order harmonic current source current on the user side, Z ch is the equivalent h harmonic impedance of the user side, is the hth harmonic voltage of the common connection point, is the hth harmonic current of the common connection point.

[0037] figure 2 is the Ramsay influence functio...

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Abstract

The invention discloses a method for computing harmonic impedance of a power system, and belongs to the field of designs for methods for computing harmonic impedance. The technical scheme includes that a complex least square method is introduced into the subject of computation of harmonic impedance of a power system, and phasor real parts and imaginary parts of measured voltage, measure current and the like are used as organic integration to be computed, so that the optimized least square solution is obtained. Raw data are screened by a method on the basis of relative complex residual error sorting while the data are introduced and processed, and influence of abnormal points to regression coefficients is effectively removed. On the basis of screening of the raw data, loop regression computation is carried out by a repeated weighting method for a complex field, influence of strong influential points to the regression coefficients is effectively reduced, and regressive robustness is improved.

Description

technical field [0001] The invention belongs to the field of harmonic impedance calculation method design, in particular to a power system harmonic impedance calculation method. 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, harmonic emission leve...

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Application Information

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IPC IPC(8): G01R27/08G01R23/16
Inventor 贾秀芳曹东升华回春赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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