CN203103100U

CN203103100U - Magnetic-integration type integrated filter inductance transformer

Info

Publication number: CN203103100U
Application number: CN2012205102667U
Authority: CN
Inventors: 许加柱; 罗隆福
Original assignee: Hunan University
Current assignee: Hunan University
Priority date: 2012-09-29
Filing date: 2012-09-29
Publication date: 2013-07-31
Anticipated expiration: 2022-09-29

Abstract

The utility model discloses a magnetic-integration type integrated filter inductance transformer which adopts two sets of three-phase shell type iron core structures or two sets of single-phase shell type iron core structures, wherein an alternating-current net side winding and a load winding are only wound on a primary iron core post; filter windings are simultaneously wound on the primary iron core post and a secondary iron core post; the structure of the primary iron core is the same as that of a conventional shell type transformer; an iron core magnetic circuit is closed; the secondary iron core adopts a magnetic circuit structure with air gaps; the set number of the filter windings is configured according to the filter needs of the system; and each set of windings is externally connected with the corresponding filter capacitor to form a specific-order harmonic filtering branch circuit. The magnetic-integration type integrated filter inductance transformer can be used for integrating a filter reactor with the transformer; the filter windings are externally connected with the filter capacitor to realize effective harmonic suppression, so that the one-time investment cost is greatly lowered; meanwhile, the secondary iron core structure can be used for providing a circulating path for leakage magnetic flux between the primary winding and the secondary winding, so that the flow direction of the leakage magnetic flux is restrained, stray losses of the transformer are lowered in a facilitating manner, and therefore, the operation efficiency of the transformer is improved.

Description

A kind of magnetic integrated form integrated filter inductance transformer

Technical field

The utility model relates to a kind of transformer, particularly a kind of magnetic integrated form integrated filter inductance transformer that integrated magnetic is combined with the integrated filter inductance technology.

Background technology

Along with the continuous development of China's power electronic technology with popularize, power electronics conversion equipment and converter system are widely used in the fields such as daily household appliances, electric railway, city rail traction, electrolysis, chemical industry, metallurgy, this type of device for converting electric energy is adopted non-linear power electronic device such as thyristor, diode, IGBT more, because non-linear power electronic device can produce certain harmonic component on the course of work, and is attended by reactive power consumption.If do not take effective harmonic wave control and reactive power compensation measure, must increase the line loss of confession, distribution system, when serious even can have influence on the operation stability of system.

Problem at above-mentioned field exists, generally adopt 3 kinds of methods to carry out harmonic wave control and reactive power compensation at present: (1) installs passive filter and Shunt Capacitor Unit at the ac bus place; (2) active filter and static passive compensation device are installed at the ac bus place; (3), adopt the multiple rectifying technology at some big capacity commutation systems.Method (1) technology maturation, cost are low, but filtering system need dispose filter reactor and capacitor, cause the filtering field take up an area of and the space bigger, influence its application in some field and occasion; Method (2) advanced technology, filter effect are better, but cost is higher, and operation troubles rate height has seriously hindered its extensive use; Method (3) is though can effectively administer harmonic wave for the AC network side, but for each rectifier transformer, 6K ± 1 characteristic harmonics electric current that 6 pulse wave rectifier devices produce has increased the harmonic loss of rectifier transformer by the net side and the valve side winding of rectifier transformer, makes system effectiveness reduce; Simultaneously, system's turnover line complexity, the transformer platform number is many, the cost height, floor space is big.

The utility model content

In order to solve the technical problem that traditional filtering field takes up room, the place is big and traditional integrated filter inductance is little, the utility model provides a kind of magnetic integrated form integrated filter inductance transformer of simple in structure, good wave filtering effect.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: transformer adopting two cover three-phase shell type core structures or the single-phase shell type core structure of two covers, AC network side winding and load winding only are wound on the main iron core post, and Filter Winding is wound on main iron core post and the secondary iron core column simultaneously.

In the above-mentioned magnetic integrated form integrated filter inductance transformer, described main iron core structure is identical with traditional shell type transformer, and iron circuit is closed; Secondary iron core adopts the magnetic structure of band air gap.

Technique effect of the present utility model is: in the utility model because integrated Filter Winding, and the tricks of Filter Winding will be determined according to the requirement of the actual filter times of system, every cover winding constitutes the filtering channel of a certain specific subharmonic by external filter capacitor.Because the equivalent impedance of Filter Winding except that the leakage impedance part of itself, also has itself and the reaction component of the iron core reactor of secondary iron core column formation; This structure has realized the integrated design of filter reactor and transformer effectively; The harmonic current that this transformer Filter Winding can effectively filtering load-side nonlinear load produces, thus the quality of power supply of AC network side improved; Also can reduce simultaneously the space and the floor space of filter greatly, for this transformer is established technical foundation in the application of different field.The present invention can be widely used in fields such as power distribution network transformer station, electric railway traction power supply, vehicle-mounted traction power supply and chemical industry, metallurgical electrolysis.

Description of drawings

Fig. 1 is the layout schematic diagram of winding of the present utility model and iron core.

Fig. 2 is a single-phase equivalent circuit diagram of the present utility model.

Fig. 3 is a main iron core plane graph of the present utility model.

Fig. 4 is a secondary iron core plane graph of the present utility model.

Among Fig. 1,1. main iron core, 2. secondary iron core, 3. load winding, 4. AC network side winding, 5. Filter Winding

Among Fig. 2,6. the equivalent leakage inductance of AC network side winding, 7. the equivalent leakage inductance of load winding, 8. the equivalent leakage inductance of the 1st Filter Winding, 9. the iron-core reactor inductance of the 1st Filter Winding correspondence, 10. with the 1st corresponding a certain specific the filter capacitor of Filter Winding, 11. the equivalent leakage inductance of i Filter Winding, 12. the iron-core reactor inductance of i Filter Winding correspondence, 13. with i corresponding a certain specific the filter capacitor of Filter Winding, 14. the equivalent leakage inductance of n Filter Winding, the iron-core reactor inductance of 15. a n Filter Winding correspondence, 16. and n corresponding a certain specific the filter capacitor of Filter Winding.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

As shown in Figure 1, magnetic integrated form integrated filter inductance transformer adopts the shell type transformer of double-iron core structure, iron core is made of jointly main iron core 1 and secondary iron core 2, and AC network side winding 4 and load winding 3 are wound in the main iron core 1, and Filter Winding 5 is wound on main iron core 1 and the secondary iron core 2 simultaneously; Wherein the tricks of Filter Winding 5 can be set according to the demand of actual engineering; Filter Winding 5 realizes the load-side harmonic current is carried out filtering by direct external filter capacitor.

Under the condition of ignoring each side winding resistance, the single-phase equivalent circuit of magnetic integrated form integrated filter inductance transformer as shown in Figure 2.When the load-side winding is powered to nonlinear load, must have harmonic current to pass through the equivalent leakage inductance 7 of load-side, this harmonic current can be shunted by shunting principle between equivalent leakage inductance 7 of AC network side winding and filtered side branch road total impedance (forming jointly by 8/9/10/11/12/13/14/15/16); The tricks of Filter Winding can will be determined according to the demand of actual engineering, 8, the equivalent leakage inductance of the corresponding a certain cover Filter Winding of 11,14 difference, 9, the inductance of the integrated filter reactor of magnetic of 12,15 corresponding a certain cover Filter Winding of difference and secondary iron core formation, its value will be much larger than equivalent leakage reactance; 10, the external filter capacitor of 13, the 16 corresponding a certain cover Filter Winding of difference; Because the inductance 9,12,15 of the integrated filter reactor of magnetic is bigger, therefore can reduce the capacitance size of filter capacitor 10,13,16 greatly, help satisfying the real work demand; With a certain cover Filter Winding is example, the inductance 9 of equivalent leakage inductance 8, the integrated filter reactor of magnetic and the filter capacitor 10 common filter branch that form at certain subharmonic, then this subharmonic current of load-side all flows in this filter branch, thereby the harmonic current and the AC network side winding of load-side is isolated, reach the purpose that harmonic wave is administered nearby; And filter branch need not to dispose external filter reactor again.This patent combines filter reactor and transformer, reduces filtering field floor space and space thereby reach.

Claims

1. magnetic integrated form integrated filter inductance transformer, it is characterized in that: transformer adopting two cover three-phase shell type core structures or the single-phase shell type core structure of two covers, AC network side winding and load winding only are wound on the main iron core post, and Filter Winding is wound on main iron core post and the secondary iron core column simultaneously.

2. magnetic integrated form integrated filter inductance transformer according to claim 1 is characterized in that: the main iron core structure is identical with traditional shell type transformer, and iron circuit is closed; Secondary iron core adopts the magnetic structure of band air gap.