Method and system for determining harmonic voltage

A technology of harmonic voltage and fundamental wave voltage, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc.

Active Publication Date: 2013-04-03
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide a method and system for determining the harmon

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  • Method and system for determining harmonic voltage
  • Method and system for determining harmonic voltage
  • Method and system for determining harmonic voltage

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Embodiment Construction

[0025] The solution of the present invention will be described in detail below in combination with the preferred embodiments thereof.

[0026] figure 1 shows a schematic flow chart of an embodiment of the method for determining harmonic voltage of the present invention;

[0027] Such as figure 1 As shown, the method for determining the harmonic voltage in this embodiment includes steps:

[0028] Step S101: Obtain the fundamental voltage and injected power of each node, and determine the positive-sequence injected current, negative-sequence injected current, and zero-sequence injected current of each node;

[0029] Step S102: Determine the positive sequence admittance matrix, negative sequence admittance matrix, and zero sequence admittance matrix of each node according to the fundamental voltage, positive sequence injection current, negative sequence injection current, and zero sequence injection current of each node;

[0030] Step S103: number each node using the node numb...

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Abstract

A method for determining harmonic voltage comprises the steps of obtaining the fundamental wave voltage and the injection electric quantity of each of the nodes, and determining positive-sequence, negative-sequence and zero-sequence current of each of the nodes; according to the fundamental wave voltage and positive-sequence, negative-sequence and zero-sequence current of each of the nodes, determining positive-sequence, negative-sequence and zero-sequence admittance matrixes of each of the nodes; numbering each of the nodes with a node numbering method, and conducting factorization on positive-sequence, negative-sequence and zero-sequence admittance matrixes with an LU decomposition according to the numbering sequence; and using harmonic power flow models to determine harmonic impedance of each of the branches, determining positive-sequence harmonic voltage, negative-sequence harmonic voltage and zero-sequence harmonic voltage of each of the nodes according to the harmonic impedance of branches and positive-sequence, negative-sequence and zero-sequence admittance matrixes after factorization, and determining the harmonic voltage of each of the node according to the positive-sequence harmonic voltage, the negative-sequence harmonic voltage and the zero-sequence harmonic voltage. The invention also provides a corresponding system. By the aid of the method and the system, the calculation precision can be improved, and the calculation can be simplified.

Description

technical field [0001] The invention relates to the technical field of electric power application, in particular to a method and system for determining harmonic voltage. Background technique [0002] In recent years, with the rapid development of the national economy, especially the manufacturing industry, and the continuous improvement of my country's requirements for energy-saving efficiency of users, a large number of electrical equipment with nonlinear characteristics are used, such as equipment with strong nonlinear characteristics of arc as the working medium : Gas discharge lamps, AC arc welding machines, electric arc furnaces, etc.; switching power supply equipment based on power electronic components: various power conversion equipment, phase-controlled speed and voltage regulation devices, large-capacity power thyristor controllable switching equipment etc.; These electrical equipment are typical harmonic sources, which bring a lot of harmonic pollution to the distri...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R23/16
Inventor 阙华坤肖勇陈启冠杨劲锋孙卫明任龙霞彭祖智刘明赫丙东
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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