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Method for controlling, restraining and eliminating voltage network harmonic of transformer magnetic circuit

A transformer and harmonic technology, applied in the field of transformer magnetic circuit control suppression and elimination of power grid harmonics, can solve the problems of increasing the difficulty of promotion and application, the complexity of active filtering technology, and the difficulty of eliminating, so as to achieve good harmonics Suppression effect, simple installation, low investment effect

Inactive Publication Date: 2006-01-18
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

This kind of measure on the circuit structure can only eliminate limited specific harmonics for passive filters; for active filters, although each harmonic can be eliminated in theory, but because active The filter is generally a power electronic device, which also generates a certain amount of harmonics. While eliminating the harmonics of the power grid, it will also bring new harmonic problems, especially for uncertain harmonics, which is very difficult to eliminate. Due to the complexity of active filtering technology, it also increases the difficulty of its promotion and application

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  • Method for controlling, restraining and eliminating voltage network harmonic of transformer magnetic circuit
  • Method for controlling, restraining and eliminating voltage network harmonic of transformer magnetic circuit

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Embodiment Construction

[0014] The load current of the transformer contains two components of the fundamental wave (50HZ) and the harmonic. When the two components of the load current pass through the secondary winding of the transformer, the fundamental wave magnetic potential F is generated respectively. 1 and harmonic magnetic potential F 2 , the load's fundamental magnetic potential and harmonic magnetic potential generate fundamental magnetic flux linkage 7 and harmonic flux linkage 8 in the magnetic circuit of the transformer respectively. On the load side of the transformer, through the current detector 6, the shunt part contains the harmonic load current i 3 =k 1 i 2 (where: i 2 -transformer load side current, i 3 - Current detector detects current, k 1 - split coefficient). shunted current i 3 Detect the harmonic component i that needs to be eliminated through the harmonic separator 5 4 ;The detected harmonic component current i 4 Connected to the harmonic control winding 4 of the t...

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Abstract

This invention provides a method for controlling voltage transformer magnetic path and eliminating electric net harmonic wave, belonging to power system harmonic controlling and electron technology field. The method comprises the following steps: adding harmonic controlling winding in the present secondary side winding, connecting in series current checker in load side of the transformer, harmonic separator is linked behind the current checker, the output end of harmonic separator is linked to the two ends of controlling winding, by changing the controlling winding's linkage way and designing the discharge coefficient of current checker and number of turns of controlling winding, making the magnetic linkage generated by controlling winding is the same with harmonic magnetic linkage by transformer load side in size while different in direction, so that it can restrict and eliminate harmonic wave. The invention has the advantages of simple devices, less investment and good economical benefit.

Description

technical field [0001] The invention belongs to the technical fields of power system harmonic control and power electronics, and in particular relates to a method for suppressing and eliminating grid harmonics by transformer magnetic circuit control. Background technique [0002] With the extensive use of modern power electronic devices, the harmonics generated by power electronic devices will degrade the power supply quality of the power grid and form harmonic pollution. Eliminating or suppressing harmonics is an important issue for improving power supply quality. At present, to eliminate harmonics at home and abroad, in addition to reducing the occurrence of harmonics in power electronic devices, filtering methods are mainly used, that is, passive and active filters are connected in series or in parallel on the grid network. These methods of eliminating harmonics actually divert or suppress harmonic currents by changing the circuit structure to form harmonic channels. Thi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 洪乃刚黄松清
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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