CN104578827A - Transformer - Google Patents
Transformer Download PDFInfo
- Publication number
- CN104578827A CN104578827A CN201510040655.6A CN201510040655A CN104578827A CN 104578827 A CN104578827 A CN 104578827A CN 201510040655 A CN201510040655 A CN 201510040655A CN 104578827 A CN104578827 A CN 104578827A
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- submodule
- frequency
- voltage
- transformer
- transformation
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
- H02M5/16—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of frequency
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a transformer. Frequency conversion is conducted after power frequency alternating-current voltage is divided, the power frequency alternating-current voltage is converted to high-frequency alternating-current voltage and then subjected to high frequency voltage transformation, and the voltage transformation function is achieved. Due to the fact that the size of the transformer is in inverse proportion to the frequency of the transformer, after power frequency voltage is converted to the high frequency voltage and subjected to voltage transformation, the size and weight of a transformation module can be reduced, high-quality voltage transformation is achieved under the condition that the size and weight of the transformer are small, and harmonic waves are filtered out before voltage transformation to prevent resonance.
Description
Technical field
The present invention relates to transformation field, particularly relate to a kind of transformer.
Background technology
In the traction drive of electric locomotive, motor train unit etc., traction transformer is the single phase industrial frequence transformer of the many secondary in single former limit.Traditional electric locomotive Industrial Frequency Transformer the alternating voltage of 25kV is dropped to traction electric machine and other vehicle mounted electrical apparatus work the electric pressure that is applicable to, wherein the vice-side winding of main transformer is powered to four-quadrant rectifying device, and auxiliary winding powers to auxiliary variable power source.Four-quadrant rectifying device converts power frequency ac voltage to direct voltage, supply Driven by inverter traction electric machine.
Main transformer adopts copper cash winding coil to form, volume and weight larger, and need cooling during work, cooling device also needs to take up room, the design of size to locomotive of the volume and weight of transformer has a great impact, particularly in the EMU of power decentralized, because the braking power of the traction power that requires and feedback is large, the weight that transformer is larger will directly affect the speed-raising of train; Simultaneously because the pulling equipment of disperse power is no longer installed concentratedly on locomotive, but dispersion is arranged in the compartment of train, and volume of transformer is huge will increase the design difficulty of train, reduces handling capacity of passengers.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of transformer, can realize high-quality transformation when volume of transformer weight is less.
For achieving the above object, the invention provides a kind of transformer, be applied between industrial-frequency alternating current potential source and inverter, described transformer comprises:
Be connected with described alternating-current voltage source, for the filtration module of filtering harmonic wave;
At least one voltage changing module, described voltage changing module comprises:
For the high pressure of described voltage source being carried out the high pressure dividing potential drop submodule of dividing potential drop;
Be connected with described high pressure dividing potential drop submodule, for power frequency ac voltage being transformed to the frequency translation submodule of high-frequency ac voltage;
Be connected with described frequency translation submodule, for the energy of described high-frequency ac voltage being carried out the transducing submodule storing transmission;
Be connected with described transducing submodule, for by the voltage transformation of described high-frequency ac voltage being the high frequency transformation submodule of target amplitude;
Be connected with described high frequency transformation submodule, the high-frequency ac voltage for being exported by described high frequency transformer is converted to the AC-DC conversion submodule of direct voltage.
Preferably, described transformer also comprises:
For the Fault Isolation submodule of isolated fault device, described high pressure dividing potential drop submodule is connected with described frequency translation submodule by described Fault Isolation submodule.
Preferably, described Fault Isolation submodule comprises discharge loop and isolated loop, and described discharge loop is made up of two antiparallel thyristors and a resistant series, and described isolated loop is a contactor.
Preferably, described transformer also comprises:
Be connected with described AC-DC conversion submodule, for disconnecting the output diode of the connection of described high frequency transformation submodule and described inverter when described high pressure dividing potential drop submodule, frequency translation submodule and described high frequency transformation submodule break down.
Preferably, described transformer also comprises:
Be connected with described output diode, for the energy storage submodule of the stored energy when described inverter works.
Preferably, described filtration module comprises inductance coil and capacitor.
Preferably, described high pressure dividing potential drop submodule is a capacitor.
Preferably, described frequency translation submodule is in parallel with described capacitor, described frequency translation submodule comprises two identical branch roads in parallel, and each branch road comprises the bidirectional switch of two series connection, and described bidirectional switch is made up of two insulated gate bipolar transistor anti-series.
Preferably, described transducing submodule is an inductance coil.
Apply transformer provided by the invention, frequency conversion is carried out after to power frequency ac voltage dividing potential drop, carry out high frequency transformation after power frequency ac voltage is transformed to high-frequency ac voltage again and realize transformation function, because the volume of transformer and frequency are inversely proportional to, so carry out volume and the weight that transformation can reduce voltage changing module part after power-frequency voltage is transformed to high frequency, realize the high-quality transformation in volume of transformer and the less situation of weight, and before transformation, carry out filtering filtering harmonic wave prevent resonance.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the transformer principle figure of prior art;
Fig. 2 is the structural representation of a kind of transformer of the present invention;
Fig. 3 is the specific embodiment topology theory figure of a kind of transformer of the present invention;
Fig. 4 is the structure principle chart of a kind of transformer embodiments of the present invention;
Fig. 5 is the another structure principle chart of a kind of transformer embodiments of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Traditional electric locomotive Industrial Frequency Transformer the alternating voltage of 25kV is dropped to traction electric machine and other vehicle mounted electrical apparatus work the electric pressure that is applicable to, wherein the vice-side winding of main transformer is powered to four-quadrant rectifying device, and auxiliary winding powers to auxiliary variable power source.Four-quadrant rectifying device converts power frequency ac voltage to direct voltage, supply Driven by inverter traction electric machine.As shown in Figure 1, be traditional Industrial Frequency Transformer varying-voltage principle schematic diagram.As can be seen from Figure 1, the advantages such as existing industrial frequency traction transformer has simply, reliability is high, cheap.But it also has the following obvious shortcoming:
1, volume and weight is large, and affect handling capacity of passengers and the high speed performance of train, particularly in the motor train unit of power decentralized, the restriction of installing space makes the impact of volume of transformer and weight particularly outstanding;
2, the output voltage of Industrial Frequency Transformer can change along with the change of load, and falling of output voltage can control to bring difficulty to transmission;
3, Industrial Frequency Transformer connects rectifying device, and rectifying device will produce characteristic of switch time high-frequency harmonic, cause car net resonance;
4, Industrial Frequency Transformer needs braking energy to feed back to Traction networks, easily makes the abnormal rising of Traction networks electrical network.
The invention provides a kind of transformer, be applied between industrial-frequency alternating current potential source and inverter, as shown in Figure 2, be the structural representation of transformer of the present invention, described transformer comprises:
Be connected with described alternating-current voltage source, for the filtration module 101 of filtering harmonic wave;
At least one voltage changing module, described voltage changing module comprises:
For the high pressure of described voltage source being carried out the high pressure dividing potential drop submodule 102 of dividing potential drop;
Be connected with described high pressure dividing potential drop submodule 102, for power frequency ac voltage being transformed to the frequency translation submodule 103 of high-frequency ac voltage;
Be connected with described frequency translation submodule 103, for the energy of described high-frequency ac voltage being carried out the transducing submodule 104 storing transmission;
Be connected with described transducing submodule 104, for by the voltage transformation of described high-frequency ac voltage being the high frequency transformation submodule 105 of target amplitude;
Be connected with described high frequency transformation submodule 105, the high-frequency ac voltage for being exported by described high frequency transformer is converted to the AC-DC conversion submodule 106 of direct voltage.
The present embodiment mesohigh dividing potential drop submodule 102 can adopt capacitor to realize dividing potential drop, and capacitor also has filter function simultaneously, forms filter branch filtering harmonic wave together with filtration module 101.
The transformer that application the present embodiment provides, frequency conversion is carried out after to power frequency ac voltage dividing potential drop, carry out high frequency transformation after power frequency ac voltage is transformed to high-frequency ac voltage again and realize transformation function, because the volume of transformer and frequency are inversely proportional to, so carry out volume and the weight that transformation can reduce voltage changing module part after power-frequency voltage is transformed to high frequency, realize the high-quality transformation in volume of transformer and the less situation of weight, and before transformation, carry out filtering filtering harmonic wave prevent resonance.
As shown in Figure 3, be the topology theory figure of another specific embodiment of the present invention, comprise 6 parts:
1) high pressure divider filter branch road.The railway traction net of alternating voltage 25kV draws high pressure, by filter reactance L, and electric capacity (C1-Cn), be back to ground wire.Wherein, the parameter of each electric capacity of electric capacity C1-Cn is the same, forms dividing potential drop and filter branch together with filter reactance L.Because the design parameter of each electric capacity is consistent, so the alternating voltage that each electric capacity bears is approximately equal to (25kV/n).Harmonic wave in inductance coil and couple capacitors high pressure carries out filtering, and multiple couple capacitors ac high-voltage carries out dividing potential drop.
2) capacitor discharge and isolated loop SP.SP loop is connected in parallel on electric capacity C two ends, is made up of discharge loop and isolated loop two branch roads.Wherein discharge loop is formed by anti-parallel thyristor S1, the S2 discharge resistance R that connects.Isolated loop is made up of a contactor Q.The Main Function in SP loop has: when electric capacity generation overvoltage fault, triggers anti-parallel thyristor, the tele-release of electric capacity is fallen rapidly by resistance, and the contactor Q that closes, fault capacitance is isolated; When module SM in device and SN breaks down, close contactor Q, isolated by fault branch.
3) exchange conversion AC-AC power modules SM.SM module is used for carrying out frequency conversion, is connected in parallel on electric capacity C two ends, is made up of four brachium pontis, and each brachium pontis is formed by two insulated gate bipolar transistor IGBT module anti-series, forms a bidirectional switch, as shown in Figure 4.Bidirectional switch can block the voltage of any direction, also can open the electric current of any direction.By suitable pulse modulation strategy, the alternating voltage of SM module to electric capacity C two ends carries out the chop control of high frequency, the alternating voltage of the power frequency 50HZ at electric capacity C two ends can be transformed into high-frequency ac voltage.
4) high frequency transformer MFT and inductance L f.Inductance L f is the carrier of stored energy and transfer, is the critical elements of converter Energy Transfer, is also ensure that converter realizes the inverting element of Sofe Switch simultaneously.The effect of high frequency transformer MFT mainly will isolate high electronegative potential, the high frequency voltage transformation that module SM exports be become the high frequency voltage of different amplitude.
5) ac-dc conversion AC-DC module SN.SN is a conventional H bridge rectification module, Main Function is the high frequency voltage exported by high frequency transformer, by the break-make of reasonably control switch device, make to produce flow of power between the converter unit of isolating transformer both sides, and high-frequency ac voltage is transformed into direct voltage.
6) output diode Do and energy storage device.Diode Do is connected on the DC output side of rectification module SN, Main Function is when filtering derided capacitors C and semiconductor module SM and SN breaks down, after branch road is isolated by SP loop, rectification module electric capacity Cd is discharged by Rd, after voltage drop, diode bears reverse voltage, automatically branch road and DC bus is blocked.Energy storage device is connected in parallel on DC bus, for when pulling motor braking, stores braking energy.
Present embodiments provide the topology of the traction solid-state transformer being applicable to electric locomotive, control mode is not limit, high pass filter can be configured in filtering part LC parameter, low pass filter, single tuned filter etc., meanwhile, inductance L and electric capacity C also can connect different numbers, in parallel different numbers.
The solid-state transformer of application the present embodiment, can eliminate the harmonic wave of Traction networks, the inductance L of Traction networks side and filter capacitor (C1-Cn) both can be configured to single tuned filter, also can be configured to high pass or low pass filter.High pass filter mainly considers the high order harmonic component that filtering switching device produces.3 in electrical network mainly considered by low pass filter, 5 subharmonic etc.The present embodiment utilizes electric capacity to carry out dividing potential drop cleverly, and with the frequency translation providing suitable alternating voltage to carry out AC-AC to module SM, the filter branch that can consist of LC again, carries out filtering process to Traction networks, improves the quality of power supply of Traction networks.
The solid-state transformer of application the present embodiment, adopt high-frequency energy transmission technology, by control module SM and SN converter, identical but the high-frequency alternating current potential source that phase place is different of frequency is produced in high frequency transformer both sides, just can the size and Orientation of controls transfer power by controlling phase relation between two high frequency voltage sources, the carrier of Energy Transfer is for connecting electrical network Lf.As shown in Figure 5, U
1with
represent voltage magnitude and the phase place of module SM output, U
2with
represent voltage magnitude and the phase place of input module SN, by controlling the phase difference between two voltage, just can the size and Orientation of controls transfer power P.
The present embodiment have employed fault redundance technology in addition, because electric capacity is connected in high pressure Traction networks, simultaneously under traction working condition, requires high, so electric capacity C and module SM, SN belong to rapid wear device, need do fault redundance process to semiconductor device overload capacity.When electric capacity generation overvoltage fault, trigger anti-parallel thyristor, rapidly the tele-release of electric capacity is fallen by resistance, and the contactor Q that closes, fault capacitance is isolated; When module SM in device and SN breaks down, close contactor Q, isolated by fault branch.Meanwhile, in SN module, electric capacity Cd is discharged by discharge resistance Rd, and capacitance voltage declines, and SN module is isolated from DC bus by diode Do.
In sum, the transformer that the present embodiment provides, can replace the original Industrial Frequency Transformer of electric locomotive, four-quadrant rectifying device, can reduce the volume and weight of train.Simultaneously can also the high-frequency harmonic of filtering Traction networks side, avoid car net resonance, utilize energy storage device store braking energy and continue to power to traction electric machine.
It should be noted that, each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.For system class embodiment, due to itself and embodiment of the method basic simlarity, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
Finally, also it should be noted that, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
Be described in detail transformer provided by the present invention above, apply specific case herein and set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. a transformer, is characterized in that, be applied between industrial-frequency alternating current potential source and inverter, described transformer comprises:
Be connected with described alternating-current voltage source, for the filtration module of filtering harmonic wave;
At least one voltage changing module, described voltage changing module comprises:
For the high pressure of described voltage source being carried out the high pressure dividing potential drop submodule of dividing potential drop;
Be connected with described high pressure dividing potential drop submodule, for power frequency ac voltage being transformed to the frequency translation submodule of high-frequency ac voltage;
Be connected with described frequency translation submodule, for the energy of described high-frequency ac voltage being carried out the transducing submodule storing transmission;
Be connected with described transducing submodule, for by the voltage transformation of described high-frequency ac voltage being the high frequency transformation submodule of target amplitude;
Be connected with described high frequency transformation submodule, the high-frequency ac voltage for being exported by described high frequency transformer is converted to the AC-DC conversion submodule of direct voltage.
2. transformer according to claim 1, is characterized in that, also comprises:
For the Fault Isolation submodule of isolated fault device, described high pressure dividing potential drop submodule is connected with described frequency translation submodule by described Fault Isolation submodule.
3. transformer according to claim 2, is characterized in that, described Fault Isolation submodule comprises discharge loop and isolated loop, and described discharge loop is made up of two antiparallel thyristors and a resistant series, and described isolated loop is a contactor.
4. transformer according to claim 2, is characterized in that, also comprises:
Be connected with described AC-DC conversion submodule, for disconnecting the output diode of the connection of described high frequency transformation submodule and described inverter when described high pressure dividing potential drop submodule, frequency translation submodule and described high frequency transformation submodule break down.
5. transformer according to claim 4, is characterized in that, also comprises:
Be connected with described output diode, for the energy storage submodule of the stored energy when described inverter works.
6. transformer according to claim 5, is characterized in that, described filtration module comprises inductance coil and capacitor.
7. transformer according to claim 6, is characterized in that, described high pressure dividing potential drop submodule is a capacitor.
8. transformer according to claim 7, it is characterized in that, described frequency translation submodule is in parallel with described capacitor, described frequency translation submodule comprises two identical branch roads in parallel, each branch road comprises the bidirectional switch of two series connection, and described bidirectional switch is made up of two insulated gate bipolar transistor anti-series.
9. transformer according to claim 8, is characterized in that, described transducing submodule is an inductance coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510040655.6A CN104578827A (en) | 2015-01-27 | 2015-01-27 | Transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510040655.6A CN104578827A (en) | 2015-01-27 | 2015-01-27 | Transformer |
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| Publication Number | Publication Date |
|---|---|
| CN104578827A true CN104578827A (en) | 2015-04-29 |
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|---|---|---|---|
| CN201510040655.6A Pending CN104578827A (en) | 2015-01-27 | 2015-01-27 | Transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208727A (en) * | 2016-08-12 | 2016-12-07 | 上海交通大学 | Isolated form single-phase AC AC changer |
| CN108233381A (en) * | 2016-12-15 | 2018-06-29 | 中国农业大学 | A kind of solid-state transformer, control method and device |
| CN111751635A (en) * | 2019-03-28 | 2020-10-09 | 株洲中车时代电气股份有限公司 | Alternating current network voltage mutation simulation system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208727A (en) * | 2016-08-12 | 2016-12-07 | 上海交通大学 | Isolated form single-phase AC AC changer |
| CN108233381A (en) * | 2016-12-15 | 2018-06-29 | 中国农业大学 | A kind of solid-state transformer, control method and device |
| CN111751635A (en) * | 2019-03-28 | 2020-10-09 | 株洲中车时代电气股份有限公司 | Alternating current network voltage mutation simulation system |
| CN111751635B (en) * | 2019-03-28 | 2021-09-17 | 株洲中车时代电气股份有限公司 | Alternating current network voltage mutation simulation system |
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