Calculating method for inductance value of filter reactor integrated on transformer and decoupling rate between windings
A filter reactor, transformer technology, applied in the direction of transformer/inductor coil/winding/connection, instrument, calculation, etc., can solve the problems of large AC resistance, high noise, large space occupation, etc.
Inactive Publication Date: 2016-04-20
STATE GRID CORP OF CHINA +3
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Problems solved by technology
In the above three application areas, the use of air-core reactors takes up a large space, and the engineering is bound to be limited. Traditional filtering devices are often not accepted by users; and the use of iron-core reactors, although the volume is greatly reduced, but iron-core reactors have The inductance is nonlinear, the AC resistance is large, which seriously affects the filtering effect, and the noise generated during operation is large
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[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0015] The wiring scheme applied to the actual system of the present invention can be found in figure 1 , the primary winding 5 of the transformer is connected to the power supply system 2, the secondary winding 6 of the transformer is connected to the nonlinear load 4, the filter winding 7 is connected to the external filter capacitor 3, and the number of filter windings 7 put into operation is determined by the harmonic characteristics of the load current , if the fifth harmonic current is the main load current, at this time, only one filter winding branch is needed and connected to the fifth filter capacitor; if the fifth or seventh harmonic current is the main load current In the main time, at this time, two filter winding branches need to be put in and connected to the fifth and seventh filter capacitors respectively.
[0016] Such as figure 2 A...
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The invention relates to the field of filter reactors integrated on transformers and the electric energy quality control, in particular to a calculating method for the inductance value of a filter reactor integrated on a transformer and the decoupling rate between windings. The filter reactor integrated on the transformer is formed by connecting one or more pairs of windings with opposite winding directions and the same turn number in series. The calculation of the inductance value of the filter reactor directly influences the filtering effect, the inductance value of the filter reactor should not be influenced by the primary windings and the secondary windings of the transformer. By equalizing one or more pairs of windings of the filter reactor into one winding and combining conversion of inductance matrixes of the windings to obtain the decoupling rate between the windings, the inductance value of the filter reactor integrated on the transformer and the decoupling rate between the windings are quantitatively calculated.
Description
technical field [0001] The invention relates to the field of filter reactors integrated in transformers and power quality control, in particular to an algorithm for the inductance of filter reactors integrated in transformers and the decoupling rate between windings. Background technique [0002] With the development of modern power electronics technology and control technology, power converter devices with nonlinear characteristics are widely used in many fields such as national production and life. Among them, in the fields of ship electric propulsion systems, household appliances and office appliances, and electric vehicles, it is necessary to install traditional filter devices composed of hollow filter reactors and filter capacitors to control harmonics. In the above three application areas, the use of air-core reactors takes up a large space, and the engineering is bound to be limited. Traditional filtering devices are often not accepted by users; and the use of iron-co...
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IPC IPC(8): H01F27/28G06F17/50
CPCG06F30/327H01F27/28
Inventor 陈跃辉周冠东罗隆福许加柱严文交马芳
Owner STATE GRID CORP OF CHINA