CN206077235U - Thyristor AC-AC frequency low-frequency power main circuit topological structure - Google Patents

Abstract

This utility model belongs to metallurgical electric and electronic technical field, there is provided thyristor AC-AC frequency low-frequency power main circuit topological structure, low frequency is carried out to existing submerged arc furnace system and is powered transformation, or carry out low frequency power supply design to new submerged arc furnace system, including：At least one three-phase transformer or three single-phase transformers, the quantity of the double anti-star-like connection windings of the secondary separate single phase winding having, three-phase windings, three-phase bridge cophase counter parallel connection winding, double anti-star-like cophase counter parallel connection windings or three-phase according at least one three-phase transformer or three single-phase transformers, transformator first winding is connected in into star-like or triangle respectively, winding quantity different from transformer secondary and different connections are mutually combined, low-frequency power main circuit topological structure can be obtained, AC/AC (alternating current) variable-frequency is realized.This utility model not only meets mineral hot furnace power supply and constantly expands powerful requirement, and has very high power factor in can ensure that use.

Description

IGCT AC-AC frequency conversion low-frequency power main circuit topological structure

Technical field

This utility model belongs to metallurgical electric and electronic technical field, and in particular to IGCT AC-AC frequency conversion low-frequency power Main circuit topological structure.

Background technology

Mineral hot furnace be produce ferrosilicon, ferronickel, Chrome ferrum, ferromanganese, carbide, Chrome manganese, silicomanganese, the field such as industrial silicon must be with setting Standby, category is used and is had a large capacity and a wide range, the industrial class of huge energy consumption.Power frequency mineral hot furnace power supply process is by the three-phase 50Hz high pressure of electrical network Alternating current, supplies the three-phase electrode in mineral hot furnace Jing after transformator is directly reduced to low pressure, due to low-voltage and high-current fortune during work OK, short online reactance pressure drop up to rated output voltage 10～15% or so.

The mineral hot furnace that power frequency is powered is additionally, since, voltage is difficult control balance between three-phase electrode, there is circulation, graphite Electrode is easily damaged, and consumed electrode greatly, causes each manufacturing enterprise to bear very heavy, and benefit is severely impacted.Inject simultaneously Mains by harmonics content is big, so the mineral hot furnace that power frequency is powered is heavy polluter again, due to the industry, manufacturer is relative at home More, power consumption is serious, and its product is that Chinese national economy and world industry are indispensable, using the industry of mineral hot furnace, Its product not only meets domestic use, also exports every year and creates a large amount of foreign exchanges for country.

In order to solve the above problems, this utility model is tied there is provided IGCT AC-AC frequency conversion low-frequency power main circuit topology Structure, which designs main circuit topological structure, realizes low frequency according to space extremely nervous between user's furnace transformer and stove Change.

Utility model content

A purpose of the present utility model is to solve at least one the problems referred to above or defect, and provides general behind at least one The advantage of explanation.

In order to realize according to these purposes of the present utility model and further advantage, this utility model provide thyristor AC- Alternation frequency low-frequency power main circuit topological structure, carries out low frequency and powers transformation to existing submerged arc furnace system, or to new Submerged arc furnace system carries out low frequency power supply design, including：

At least one three-phase transformer or three single-phase transformers, according at least one three-phase transformer or three lists The secondary separate single phase winding having of phase transformer, three-phase windings, three-phase bridge cophase counter parallel connection winding, double anti-star-like homophases The quantity of anti-parallel connection winding or the double anti-star-like connection windings of three-phase, at least one three-phase transformer or three single-phase changes by described in The first winding of depressor is connected in star-like or triangle respectively, and Secondary Winding is connected in star-like, triangle, three-phase bridge with contrary simultaneously Connection, double anti-star-like cophase counter parallel connections or double anti-star-like, are mutually combined, obtain the various structures of low-frequency power main circuit topology, Realize AC-AC frequency conversion.

Preferably, at least one three-phase transformer or three single-phase transformers are a three-phase transformer or three Platform single-phase transformer, and the secondary separate single phase winding having of a three-phase transformer or three single-phase transformers When quantity is any one quantity in 1 to 16, a three-phase transformer or three single-phase transformers are once connected in star-like Or triangle, the secondary star-like or triangle connection for being connected in any one quantity in 1 to 16, it is mutually combined, and using three-phase half Ripple topology is elementary cell, obtains low-frequency power main circuit topological structure.

Preferably, at least one three-phase transformer or three single-phase transformers are a three-phase transformer or three Platform single-phase transformer, and the number of the secondary separate single phase winding having of a three-phase transformer or three single-phase transformers Measure for 3,6,9 or 15 when, a three-phase transformer or three single-phase transformers are once connected in into star-like or triangle, two It is secondary to be connected in 3,6,9 or 15 star-like or triangle connections, it is mutually combined, and is elementary cell using three-phase bridge topology, it is secondary A three-phase windings AC-AC frequency conversion after produce three phase low frequency a phase, according to three phase low frequency output be connected in star-like or triangle Difference, obtain low-frequency power main circuit topological structure.

Preferably, at least one three-phase transformer or three single-phase transformers are a three-phase transformer or three Platform single-phase transformer, and the number of the secondary separate single phase winding having of a three-phase transformer or three single-phase transformers Measure for 2,4,6,8,10,12,14 or 16 when, a three-phase transformer or three single-phase transformers are once connected in star-like Or triangle, it is secondary to be connected in 2,4,6,8,10,12,14 or 16 star-like or triangle connections, it is mutually combined, and applies three-phase Bridge topology is elementary cell, obtains low-frequency power main circuit topological structure.

Preferably, at least one three-phase transformer or three single-phase transformers are a three-phase transformer or three Platform single-phase transformer, and the number of the secondary separate single phase winding having of a three-phase transformer or three single-phase transformers Measure for 4,8,12 or 16 when, a three-phase transformer or three single-phase transformers are once connected in into star-like or triangle, It is secondary to be connected in 2,4,6,8 star-like or triangle cophase counter parallel connection connections, each star-like or triangle cophase counter parallel connection connection The half cycle of three phase low frequency is produced, is connected in star-like different from triangle according to low frequency output, is mutually combined, and opens up using three-phase bridge Flutter as elementary cell, obtain low-frequency power main circuit topological structure.

Preferably, at least one three-phase transformer is three three-phase transformers, and three three-phase transformers The secondary independent three-phase windings having quantity be 2,4,6,8,10,12,14 or 16 when, by three three-phase transformers Star-like or triangle is connected in once, it is secondary to be connected in 2,4,6,8,10,12,14 or 16 star-like or triangle connections, and should It is elementary cell with three-phase bridge topology, every secondary star-like or delta windings of three-phase transformer are used for producing in three phase low frequency A phase, according to low frequency output be connected in it is star-like be mutually combined from the different of triangle, obtain low-frequency power main circuit topological structure.

Preferably, at least one three-phase transformer is three three-phase transformers, and three three-phase transformers The secondary independent three-phase windings having quantity be 2,4,6,8,10,12,14,16 when, by three three-phase transformers Star-like or triangle is connected in once, it is secondary to be connected in that 1,2,3,4,5,6,7,8 are star-like or triangle homophase is connected in parallel, and should It is elementary cell with three-phase bridge topology, every secondary star-like or triangle cophase counter parallel connection winding of three-phase transformer is used for producing A phase in three phase low frequency, according to low frequency output be connected in it is star-like be mutually combined from the different of triangle, obtain the main electricity of low-frequency power Road topological structure.

Preferably, at least one three-phase transformer is a three-phase transformer, and secondary independent three having When the quantity of the double anti-star-like connection winding of phase is any one quantity in 1 to 16, a three-phase transformer is once connected in into three It is angular or star-like, the double anti-star-like connection windings of the secondary three-phase for being connected in any one quantity in 1 to 16, main circuit application three-phase half Ripple topology is elementary cell, is mutually combined, obtains low-frequency power main circuit topological structure.

Preferably, at least one three-phase transformer is three three-phase transformers, and secondary with independent three-phase bridge Formula cophase counter parallel connection connection winding quantity be 1 to 16 in any one quantity when, three three-phase transformers are once connected in Star-like or triangle, the secondary three-phase bridge cophase counter parallel connection connection winding for being connected in any one quantity in 1 to 16, main circuit application Three-phase bridge inverse parallel is elementary cell, and the secondary star-like or triangle cophase counter parallel connection winding of every three-phase transformer is used for producing A phase in raw three phase low frequency, is connected in star-like different from triangle according to low frequency output, is mutually combined, obtains low-frequency power master Circuit topological structure.

Preferably, at least one three-phase transformer is a three-phase transformer, an and three-phase transformer The secondary independent three-phase bridge cophase counter parallel connection winding having or independent double anti-star-like cophase counter parallel connection windings number Measure for 3,6,9,12 or 15 when, a three-phase transformer is once connected in into star-like or triangle, it is secondary be connected in 3,6, 9th, the three-phase bridge cophase counter parallel connection connection winding of 12 or 15 or double anti-star-like cophase counter parallel connection windings, main circuit are selected Three-phase bridge or three-phase semiwave are elementary cell, and each three-phase windings combines the phase in generation three phase low frequency with convertor circuit, It is connected in star-like different from triangle according to low frequency output, is mutually combined, obtains low-frequency power main circuit topological structure.

Preferably, at least one three-phase transformer is three three-phase transformers, and three three-phase transformers The secondary independent three-phase windings having quantity be 3,6,9,12 or 15 when, by three three-phase transformers once Be connected in star-like or triangle, it is secondary to be connected in star-like or triangle, and be elementary cell using three-phase bridge topology, each three-phase around Group produces a phase of low-frequency power, is star-like or the difference of delta connection according to low frequency output, is mutually combined, obtains low-frequency electrical Source main circuit topological structure.

The beneficial effects of the utility model

1st, when this utility model ensures that low-frequency power runs, will not be frequent between different phase inverse parallel rectification units in three-phase Circulation, will not cause Circuit Fault on Secondary Transformer not problem short-circuit between homophase.

2nd, this utility model is avoided with traditional double reverse-stars type (or double reverse-stars type cophase counter parallel connection or the same contrary of three-phase bridge It is in parallel) for elementary cell, it is necessary to former furnace transformer is transformed, increases paralleing reactor, the off-time is longer, user charge With higher defect.

3rd, this utility model meets existing mineral hot furnace and is possible to as separate unit three-phase according to capacity difference transformator, and also having can Can be single-phase for three, it is also possible to for three three-phases, and transformer secondary has the complex situations of different windings, design circuit meets The needs of the low frequencyization transformation of various combination

4th, this utility model devises new design object, and transformator can be three-phase separate unit or three-phase three, its it is secondary can Think double anti-star-like, the three-phase bridge cophase counter parallel connections of three-phase, can also be double anti-star-like cophase counter parallel connections, meet national requirements Newly-built submerged arc furnace system capacity is not less than the requirement of 25000kVA.

Description of the drawings

Basic element circuit schematic diagrams of the Fig. 1 for this utility model embodiment 1；

Basic element circuit schematic diagrams of the Fig. 2 for this utility model embodiment 2；

Basic element circuit schematic diagrams of the Fig. 3 for this utility model embodiment 3；

Basic element circuit schematic diagrams of the Fig. 4 for this utility model embodiment 4；

Basic element circuit schematic diagrams of the Fig. 5 for this utility model embodiment 5；

Basic element circuit schematic diagrams of the Fig. 6 for this utility model embodiment 6；

Basic element circuit schematic diagrams of the Fig. 7 for this utility model embodiment 7；

Basic element circuit schematic diagrams of the Fig. 8 for this utility model embodiment 8；

Basic element circuit schematic diagrams of the Fig. 9 for this utility model embodiment 9；

Basic element circuit schematic diagrams of the Figure 10 for this utility model embodiment 10.

Specific embodiment

Below in conjunction with the accompanying drawings this utility model is described in further detail, to make those skilled in the art with reference to explanation Book word can be implemented according to this.

It should be appreciated that it is used herein such as " have ", "comprising" and " including " term be not precluded from one or The presence or addition of multiple other elements or its combination.

This utility model provides IGCT AC-AC frequency conversion low-frequency power main circuit topological structure, to existing mineral hot furnace System carries out low frequency and powers transformation, or carries out low frequency power supply design to new submerged arc furnace system, including：

At least one three-phase transformer or three single-phase transformers, according at least one three-phase transformer or three lists The secondary separate single phase winding having of phase transformer, three-phase windings, three-phase bridge cophase counter parallel connection winding, double anti-star-like homophases The quantity of anti-parallel connection winding or the double anti-star-like connection windings of three-phase, at least one three-phase transformer or three single-phase changes by described in The first winding of depressor is connected in star-like or triangle respectively, and Secondary Winding is connected in star-like, triangle, three-phase bridge with contrary simultaneously Connection, double anti-star-like cophase counter parallel connections or three-phase are double anti-star-like, are mutually combined, obtain various knots of low-frequency power main circuit topology Structure, realizes AC-AC frequency conversion.

Difference of the equipment with power system capacity be currently in use now for domestic mineral hot furnace industry, furnace transformer has single-phase and three Two big class of phase, transformator have separate unit and a difference of three, its secondary side is per mutually having 1,2,3,4,5,6,7,8,9,10,11,12, 13rd, this feature of each in 14,15,16 current potentials single-phase winding independent of each other, devises various different covering The all combinations of these structures, meet and the body of heater and furnace transformer in used submerged arc furnace system are not transformed, just may be used Supporting different main circuit topological structure, realizes that low frequencyization is transformed, and can prevent the controlled rectification of the main circuit of composition three phase low frequency There is circulation in inverse parallel elementary cell, cause rectifier transformer secondary side short circuit in winding.

For the domestic new mineral hot furnace smelting equipment built, furnace transformer is all designed as three-phase, can be designed as list Platform or three, once have a difference of triangle and wye connection by which, and secondary side has 1 to 16 current potential three-phase independent of each other Winding, triangle or star-like can be connected in, it is possibility to have 1 to 16 current potential three-phase bridge cophase counter parallel connection independent of each other or Double anti-star-like cophase counter parallel connections, can also there are 1 to 16 current potential double anti-star-like these permutation and combination independent of each other and features, if The combination of various different structures is counted.

On the basis of above-mentioned situation, this utility model provides embodiment 1, and at least one three-phase transformer is one Three-phase transformer or three single-phase transformers, and a three-phase transformer or the secondary independence having of three single-phase transformers The quantity of single-phase winding is during any one quantity, the transformator to be once connected in star-like and triangle in 1 to 16, secondary to connect For the star-like or triangle connection of any one quantity in 1 to 16, it is mutually combined, and is substantially single using three-phase semiwave topology Unit, obtains low-frequency power main circuit topological structure.

Transformer secondary have multiple independent single-phase windings (i.e. 1,2,3,4,5,6,7,8,9,10,11,12,13, 14th, 15 or 16), by external connection, original furnace transformer is once connected in star-like or triangle, secondary difference respectively It is connected in that multiple (1 to 16) star-like or triangle connection, is mutually combined, main circuit becomes flow structure application three-phase semiwave topology into base This unit, can obtain main circuit topology circuit has 256 kinds of structures, realizes AC-AC frequency conversion, constitutes three phase low frequency conversion, and Fig. 1 is During using a three-phase transformer or three single-phase transformers, it is once delta connection to provide furnace transformer, and which is secondary Multiple separate single phase windings are connected in multiple triangle connections, and the corresponding three phase low frequency main circuit of one delta connection is substantially single First circuit theory diagrams, the main circuit structure of remaining combination are omitted.

Embodiment of the present utility model 2, at least one three-phase transformer or three single-phase transformers, and the transformation When the quantity of the secondary separate single phase winding having of device is 3,6,9 or 15, the transformator is once connected in into star-like or three It is angular, it is secondary to be connected in 3,6,9 or 15 star-like or triangle connections, it is mutually combined, and is substantially single using three-phase bridge topology Unit, obtains low-frequency power main circuit topological structure.

When transformer secondary is per mutually independent single-phase winding individual with 3 integral multiple (i.e. 3,6,9,12,15), will Originally furnace transformer is once connected in star-like and triangle respectively, it is secondary be connected in respectively 3 integral multiple (i.e. 3,6,9,12,15) The phase low frequency transform in three-phase is realized in the connection of star-like or triangle, each star-like or triangle connection, and main circuit becomes flow structure Using three-phase bridge topology be elementary cell, current transformer output be mutually combined by the difference of triangle and wye connection, can obtain There are 80 kinds of structures (separate unit three-phase transformer and three single-phase transformers are each 40 kinds) to main circuit topology circuit, realize friendship-alternation Frequently, three phase low frequency conversion is constituted, Fig. 2 is eliminated using a three-phase transformer and used three single-phase transformer transformators external Terminals subgraph and inside transformer schematic diagram are drawn, it is once delta connection to give furnace transformer, corresponding low frequency Most basic unit basic circuit diagram is converted, the main circuit structure of remaining combination is omitted as space is limited.

Embodiment of the present utility model 3, at least one three-phase transformer or three single-phase transformers, and the transformation When the quantity of the secondary separate single phase winding having of device is 2,4,6,8,10,12,14 or 16, the transformator is once connect It is for star-like or triangle, secondary to be connected in 2,4,6,8,10,12,14 or 16 star-like or triangle connections, it is mutually combined, and should It is elementary cell with three-phase bridge topology, obtains low-frequency power main circuit topological structure.

When transformer secondary is per mutually having 2,4,6,8,10,12,14,16 single-phase windings independent of each other, by original Carry out furnace transformer and be once connected in star-like or triangle respectively, it is secondary be connected in respectively 2,4,6,8,10,12,14,16 it is star-like or Triangle connects, and is mutually combined, and main circuit becomes flow structure application three-phase bridge topology into elementary cell, each star-like or triangle Winding is used for a half cycle for producing every phase in three phase low frequency, and two star-like or delta windings are electric for producing three phase low frequency Pressure, current transformer output are mutually combined by the difference of triangle and wye connection, and can obtain main circuit topology circuit has 128 kinds of knots Structure, realizes AC-AC frequency conversion, constitutes three phase low frequency conversion, and it is once delta connection that Fig. 3 gives furnace transformer, corresponding The schematic diagram of most basic unit, the main circuit structure of remaining combination are omitted as space is limited.

Embodiment of the present utility model 4, at least one three-phase transformer or three single-phase transformers, and described one When the quantity of the secondary separate single phase winding having of three-phase transformer or three single-phase transformers is 4,8,12,16, by institute State a three-phase transformer and be once connected in star-like or triangle, it is secondary to be connected in 2,4,6,8 star-like or trianglees with contrary simultaneously Connection connection, is mutually combined, and is elementary cell using three-phase bridge topology, obtains low-frequency power main circuit topological structure.

When the furnace transformer for using it is secondary per there is 4,8,12,16 single-phase windings independent of each other mutually when, by original Carry out furnace transformer and be once connected in star-like or triangle respectively, it is secondary to be connected in 2,4,6,8 same contraries of star-like or triangle respectively It is connected in parallel, is mutually combined, main circuit becomes flow structure application three-phase bridge cophase counter parallel connection topology into elementary cell, and each is star-like Or triangle cophase counter parallel connection winding is used for producing a half cycle of every phase in three phase low frequency, two star-like or same contraries of triangle Parallel winding is used for producing three phase low frequency voltage, is connected in star-like different from triangle according to three phase low frequency output, can obtain Main circuit topology circuit has 64 kinds of structures (separate unit three-phase transformer and three single-phase transformers are each 32 kinds), realizes AC-AC frequency conversion, Three phase low frequency conversion is constituted, it is once delta connection that Fig. 4 gives furnace transformer, the principle of corresponding most basic unit Figure, the main circuit structure of remaining combination are omitted as space is limited.

Embodiment of the present utility model 5, at least one three-phase transformer is three three-phase transformers, and described three When the quantity of the secondary independent three-phase windings having of three-phase transformer is 2,4,6,8,10,12,14 or 16, by described three Three-phase transformer is once connected in star-like and triangle, secondary to be connected in 2,4,6,8,10,12,14 or 16 star-like or trianglees Connection, is mutually combined, and is elementary cell using three-phase bridge topology, obtains low-frequency power main circuit topological structure.

When the furnace transformer for using is three three-phase furnace transformators, and it is secondary have 2,4,6,8,10,12,14, During 16 three-phase windings independent of each other, original three furnace transformers are once being connected in into star-like and triangle respectively, it is secondary 2,4,6,8,10,12,14,16 star-like or triangle connections being connected in respectively, being mutually combined, main circuit becomes flow structure application three-phase Bridge type topology is elementary cell, realizes AC-AC frequency conversion, constitutes three phase low frequency conversion, every transformer secondary and a three-phase bridge Formula blow-up-alternation current circuit is connected, there is provided a phase of three phase low frequency, and the difference of triangle and wye connection is pressed in current transformer output It is mutually combined, can obtain main circuit topology circuit there are 64 kinds of structures, its most basic unit main circuit topology can be found in Fig. 5.

Above-described embodiment, is both for domestic mineral hot furnace industry and is now currently in use difference of the equipment with power system capacity, design The furnace transformer for using once and Secondary Winding.

Embodiment of the present utility model 6, when the furnace transformer for using is three three-phase furnace transformators, and secondary tool When there are 2,4,6,8,10,12,14,16 three-phase windings independent of each other, original three furnace transformers are once being connect respectively It is for star-like and triangle, secondary to be connected in 1,2,3,4,5,6,7,8 star-like or triangle cophase counter parallel connection connections respectively, mutual group Close, main circuit becomes flow structure application three-phase bridge topology into elementary cell, realizes AC-AC frequency conversion, constitutes three phase low frequency conversion, often Platform transformer secondary is connected with a three-phase bridge blow-up-alternation current circuit, there is provided a phase of three phase low frequency, current transformer output It is mutually combined by the difference of triangle and wye connection, can obtain main circuit topology circuit there are 64 kinds of structures, its most basic list First main circuit topology can be found in Fig. 6.

Embodiment of the present utility model 7, at least one three-phase transformer is a three-phase transformer, and described one When the quantity of the double anti-star-like connection windings of the secondary independent three-phase having of three-phase transformer is any one quantity in 1 to 16, Three three-phase transformers are once connected in into triangle or star-like, the secondary three-phase for being connected in any one quantity in 1 to 16 is double Anti- star-like connection winding, is mutually combined, and is elementary cell using three-phase semiwave topology, obtains low-frequency power main circuit topology knot Structure.

To project begun newly at home, the mineral hot furnace smelting system built is needed, to reach the purpose of energy-saving and emission-reduction, in design Stage just can adopt the low frequency power supply based on AC-AC frequency conversion, and it is a three-phase transformer to design the furnace transformer for using, Once connect or star-like connection for triangle, secondary is with 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 When the double anti-star-like shapes of three-phase independent of each other connect winding, main circuit topological structure has 32 kinds, and Fig. 7 gives furnace transformer one It is secondary for delta connection, secondary to connect winding for the double anti-star-like shapes of multiple independent three-phases, corresponding most basic element circuit is former Reason figure, other main circuit structures are omitted as space is limited.

Embodiment of the present utility model 8, at least one three-phase transformer is three three-phase transformers, and described three The quantity of the secondary independent three-phase bridge cophase counter parallel connection connection winding having of three-phase transformer is any one number in 1 to 16 During amount, three three-phase transformers are once connected in into star-like and triangle, the secondary three-phase for being connected in any one quantity in 1 to 16 Bridge-type cophase counter parallel connection connects winding, is mutually combined, obtains low-frequency power main circuit topological structure.

To project begun newly at home, the mineral hot furnace smelting system built is needed, to reach the purpose of energy-saving and emission-reduction, in design Stage just can adopt the low frequency power supply based on AC-AC frequency conversion, and at this moment with the difference of mineral hot furnace power supply capacity, design selects 3 Platform three-phase transformer, once connects or star-like connection for triangle, secondary to connect for triangle or star-like connection cophase counter parallel connection, And it is secondary different by mineral hot furnace capacity, can be connected in 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 it is only each other When vertical three-phase bridge cophase counter parallel connection connects winding, a cophase counter parallel connection winding of every transformator produces three phase low frequency One phase, current transformer output are mutually combined by the difference of triangle and wye connection, and main circuit topological structure has 128 kinds, and Fig. 8 is given Furnace transformer is once delta connection, it is secondary for multiple independent three-phase bridge cophase counter parallel connections connection windings when, most Basic element circuit figure, main circuit structure of the transformator once for star-star connection combination are omitted as space is limited.

Embodiment of the present utility model 9, it is described to be at least a three-phase transformer, and the secondary tool of the three-phase transformer The quantity of the independent three-phase bridge cophase counter parallel connection winding that has or independent double anti-star-like cophase counter parallel connection windings is 3,6, 9th, 12 or 15 when, a three-phase transformer is once connected in into star-like or triangle, it is secondary be connected in 3,6,9,12 or The three-phase bridge cophase counter parallel connection connection winding of 15 or double anti-star-like cophase counter parallel connection windings, are mutually combined, obtain low frequency Electric power main circuit topological structure.

To project begun newly at home, the mineral hot furnace smelting system built is needed, to reach the purpose of energy-saving and emission-reduction, can be adopted Low frequency power supply based on AC-AC frequency conversion, it is a three-phase transformer to design the furnace transformer selected, and is once triangle Connection or star-like connection, and it is secondary different by mineral hot furnace capacity, 3,6,9,12,15 three-phase bridges independent of each other can be connected in When cophase counter parallel connection or double anti-star-like cophase counter parallel connection connection windings, each cophase counter parallel connection winding generation three-phase of transformator is low One phase of frequency, is mutually combined by the difference of triangle or wye connection according to current transformer output, and main circuit topological structure has 80 kinds, It is once delta connection that Fig. 9 gives furnace transformer, secondary to connect windings for multiple independent double anti-star cophase counter parallel connections, The circuit theory diagrams of most basic unit.

Embodiment of the present utility model 10, at least one three-phase transformer is three three-phase transformers, and described three When the quantity of the secondary independent three-phase windings having of platform three-phase transformer is 3,6,9,12 or 15, by the separate unit three Phase transformer or three three-phase transformers are once connected in star-like or triangle, secondary to be connected in star-like or triangle, are mutually combined, and It is elementary cell using three-phase bridge or three-phase semiwave topology, obtains low-frequency power main circuit topological structure.

To project begun newly at home, the mineral hot furnace smelting system built is needed, to reach the purpose of energy-saving and emission-reduction, can be adopted Low frequency power supply based on AC-AC frequency conversion, it is a three-phase transformer or three three phase transformations to design the furnace transformer for using Depressor, and it is secondary be once connected in triangle or star-like when there are 3,6,9,12,15 three-phase windings independent of each other, it is secondary to connect For star-like or triangle, the basic current transforming unit of main circuit elects three-phase bridge topology or three-phase semiwave topology as, transformator each Star-like or delta windings produce a phase of three phase low frequency, press triangle according to current transformer output Bu Tong mutual with wye connection Combination, main circuit structure can be combined as 80 kinds, and it is once delta connection that Figure 10 gives transformator, secondary to connect for triangle Line, basic circuit of the main circuit topology from three-phase bridge, other electrical combinations are omitted.

This utility model not only meets the requirement that mineral hot furnace power constantly expands, and can ensure that in use There is very high power factor.

Although enforcement of the present utility model is disclosed as above, which is not restricted to listed by description and embodiment With it can be applied to various suitable fields of the present utility model completely, for those skilled in the art, can hold Change places and realize other modification, therefore under the general concept limited without departing substantially from claim and equivalency range, this practicality is new Type is not limited to specific details and shown here as the legend with description.

Claims (10)

1. IGCT AC-AC frequency conversion low-frequency power main circuit topological structure, it is characterised in that existing submerged arc furnace system is carried out Low frequency is powered transformation, or carries out low frequency power supply design to new submerged arc furnace system, including：

At least one three-phase transformer or three single-phase transformers, according at least one three-phase transformer or three single-phase changes The secondary separate single phase winding having of depressor, three-phase windings, three-phase bridge cophase counter parallel connection winding, double anti-star-like same contraries are simultaneously The quantity of connection winding or the double anti-star-like connection windings of three-phase, at least one three-phase transformer or three single-phase transformers by described in First winding be connected in star-like or triangle respectively, by Secondary Winding be connected in star-like, triangle, three-phase bridge cophase counter parallel connection, Double anti-star-like cophase counter parallel connections or three-phase are double anti-star-like, are mutually combined, obtain the various structures of low-frequency power main circuit topology, Realize AC-AC frequency conversion.

2. IGCT AC-AC frequency conversion low-frequency power main circuit topological structure as claimed in claim 1, it is characterised in that described At least one three-phase transformer or three single-phase transformers are a three-phase transformer or three single-phase transformers, and described one The quantity of the secondary separate single phase winding having of platform three-phase transformer or three single-phase transformers is any one in 1 to 16 During quantity, a three-phase transformer or three single-phase transformers are once connected in into star-like or triangle, it is secondary to be connected in 1 to 16 In any one quantity star-like or triangle connection, be mutually combined, and using three-phase semiwave topology be elementary cell, obtain low Frequency power main circuit topological structure.

3. IGCT AC-AC frequency conversion low-frequency power main circuit topological structure as claimed in claim 1, it is characterised in that described At least one three-phase transformer or three single-phase transformers are a three-phase transformer or three single-phase transformers, and described one When the quantity of the secondary separate single phase winding having of platform three-phase transformer or three single-phase transformers is 3,6,9 or 15, will One three-phase transformer or three single-phase transformers are once connected in star-like or triangle, secondary to be connected in 3,6,9 or 15 stars Type or triangle connection, are mutually combined, and are elementary cell using three-phase bridge topology, and a secondary three-phase windings are handed over-handed over A phase of three phase low frequency is produced after frequency conversion, the difference of star-like or triangle is connected according to three phase low frequency output, low-frequency power is obtained Main circuit topological structure.

4. IGCT AC-AC frequency conversion low-frequency power main circuit topological structure as claimed in claim 1, it is characterised in that described At least one three-phase transformer or three single-phase transformers are a three-phase transformer or three single-phase transformers, and described one The quantity of the secondary separate single phase winding having of platform three-phase transformer or three single-phase transformers is 2,4,6,8,10,12,14 Or when 16, a three-phase transformer or three single-phase transformers are once connected in into star-like or triangle, it is secondary be connected in 2, 4th, 6,8,10,12,14 or 16 star-like or triangle connections, are mutually combined, and are elementary cell using three-phase bridge topology, obtain To low-frequency power main circuit topological structure.

5. IGCT AC-AC frequency conversion low-frequency power main circuit topological structure as claimed in claim 1, it is characterised in that described At least one three-phase transformer or three single-phase transformers are a three-phase transformer or three single-phase transformers, and described one When the quantity of the secondary separate single phase winding having of platform three-phase transformer or three single-phase transformers is 4,8,12 or 16, will One three-phase transformer or three single-phase transformers are once connected in star-like or triangle, it is secondary be connected in 2,4,6,8 it is star-like Or the connection of triangle cophase counter parallel connection, the half cycle of each star-like or triangle cophase counter parallel connection connection generation three phase low frequency, root It is connected in star-like different from triangle according to low frequency output, is mutually combined, and be elementary cell using three-phase bridge topology, obtains low frequency Electric power main circuit topological structure.

6. IGCT AC-AC frequency conversion low-frequency power main circuit topological structure as claimed in claim 1, it is characterised in that described At least one three-phase transformer is three three-phase transformers, and the secondary independent three-phase having of three three-phase transformers around When the quantity of group is 2,4,6,8,10,12,14 or 16, three three-phase transformers are once connected in into star-like or triangle, It is secondary to be connected in 2,4,6,8,10,12,14 or 16 star-like or triangle connections, and be substantially single using three-phase bridge topology Unit, every secondary star-like or delta windings of three-phase transformer are used for producing the phase in three phase low frequency, are mutually combined, obtain Low-frequency power main circuit topological structure.

7. IGCT AC-AC frequency conversion low-frequency power main circuit topological structure as claimed in claim 1, it is characterised in that described At least one three-phase transformer is a three-phase transformer, and the number of the double anti-star-like connection windings of the secondary independent three-phase having Measure during any one quantity, a three-phase transformer to be once connected in triangle or star-like in 1 to 16, it is secondary to be connected in 1 The double anti-star-like connection windings of the three-phase of any one quantity into 16, main circuit application three-phase semiwave topology is elementary cell, mutually Combination, obtains low-frequency power main circuit topological structure.

8. IGCT AC-AC frequency conversion low-frequency power main circuit topological structure as claimed in claim 1, it is characterised in that described At least one three-phase transformer is three three-phase transformers, and secondary connects winding with independent three-phase bridge cophase counter parallel connection Quantity be 1 to 16 in any one quantity when, three three-phase transformers are once connected in into star-like or triangle, it is secondary to be connected in 1 The three-phase bridge cophase counter parallel connection connection winding of any one quantity into 16, the inverse parallel of main circuit application three-phase bridge is substantially single Unit, every secondary star-like or triangle cophase counter parallel connection winding of three-phase transformer are used for producing the phase in three phase low frequency, phase Mutually combine, obtain low-frequency power main circuit topological structure.

9. IGCT AC-AC frequency conversion low-frequency power main circuit topological structure as claimed in claim 1, it is characterised in that described At least one three-phase transformer is a three-phase transformer, and the secondary independent three-phase having of a three-phase transformer When the quantity of bridge-type cophase counter parallel connection winding or independent double anti-star-like cophase counter parallel connection winding is 3,6,9,12 or 15, One three-phase transformer is once connected in into star-like or triangle, the secondary three-phase bridge for being connected in 3,6,9,12 or 15 is same Contrary is connected in parallel winding or double anti-star-like cophase counter parallel connection windings, and it is basic that main circuit selects three-phase bridge or three-phase semiwave Unit, is connected in star-like different from triangle according to low frequency output, is mutually combined, obtains low-frequency power main circuit topological structure.

10. IGCT AC-AC frequency conversion low-frequency power main circuit topological structure as claimed in claim 1, it is characterised in that described At least one three-phase transformer is three three-phase transformers, and the secondary independent three-phase having of three three-phase transformers When the quantity of winding is 3,6,9,12 or 15, three three-phase transformers are once connected in into star-like or triangle, it is secondary Star-like or triangle is connected in, and is elementary cell using three-phase bridge topology, a phase of each three-phase windings generation low-frequency power, It is star-like or the difference of delta connection according to low frequency output, is mutually combined, obtains low-frequency power main circuit topological structure.