CN204947891U - A kind of transformer leakage inductance that utilizes is as the PWM rectifier of LCL filtering - Google Patents
A kind of transformer leakage inductance that utilizes is as the PWM rectifier of LCL filtering Download PDFInfo
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Abstract
The utility model relate to a kind of transformer leakage inductance that utilizes as the PWM rectifier of LCL filtering, comprise transformer and LCL filter-rectifier, LCL filter-rectifier comprises LCL filter and PWM rectifier, transformer accesses from 10kV electrical network, be AC400V after transformation, adopt LCL filter filtering high order harmonic component, and then after PWM rectifier, supply DC charging motor, charge for battery, LCL filter-rectifier comprises energy storage inductor L2 and filter capacitor C, LCL filter-rectifier utilizes the leakage inductance of transformer as filter inductance L1, conventional PWM rectifier, LCL is adopted to form filtering and accumulator.Wherein L1 is filter inductance, and L2 is energy storage inductor, and filter capacitor C is filter capacitor, and PWM is rectifier, adopts LCL filter circuit to eliminate current fluctuation and interference between transformer and rectifying device, ensures the current stabilization before rectifier.Therefore transformer leakage inductance can be utilized to alternative filter inductance L1 and meets filter effect, can save the hardware cost of LCL circuit like this, can also reduce volume and the energy consumption of rectifying part.Total inductance value needed for LCL filter-rectifier is less than L filter, is therefore more suitable for applying on high-power, that switching frequency is lower current-control type grid-connection device.
Description
Technical field
The utility model belongs to new-energy automobile field, is specifically related to a kind of transformer leakage inductance that utilizes as the PWM rectifier system of LCL filtering.
Background technology
Battery replacement of electric automobile pattern is also known as ground charging system, and namely battery pack fast replacement system, also claims mechanical charge.The object of its charging is reached for by the battery pack directly changing electric automobile.Because battery weight is comparatively large, the specialization changing battery requires comparatively strong, need be equipped with professional and complete the replacing of battery, charging and maintenance fast by professed machine.Utilize battery altering charge mode, electric automobile user can rent the storage battery being full of electricity, changes the storage battery exhausted, and is conducive to improving vehicle service efficiency, also improves convenience and the agility of user's use; Low-valley interval can be utilized to charge to the storage battery changed, reduce charging cost, improve vehicle operating economy.
Need in charging batteries of electric automobile system first AC rectification to be made into direct current, thus will adopt PWM rectifier.But combining inverter generally adopts high-frequency PWM to modulate, cause a large amount of higher harmonic currents to enter electrical network, like this can to other EMI(Electron-MagneticInterference in electrical network) sensitive equipment produces interference.
Summary of the invention
In order to overcome the deficiencies in the prior art, put forward the PWM rectifier utilizing transformer leakage inductance as LCL filtering, the utility model compares traditional L-type filter, when same inductance value, LCL filter-rectifier is even more ideal to high-frequency harmonic inhibition, and is applied to grid-connection converter equipment that is high-power, low switching frequency gradually.
The technical solution of the utility model is, a kind of transformer leakage inductance that utilizes is as the PWM rectifier of LCL filtering, comprise transformer and LCL filter-rectifier, LCL filter-rectifier comprises LCL filter and PWM rectifier, transformer accesses from 10kV electrical network, be AC400V after transformation, adopt LCL filter filtering high order harmonic component, and then after PWM rectifier, supply DC charging motor, charge for battery, LCL filter-rectifier comprises energy storage inductor L2 and filter capacitor C, LCL filter-rectifier utilizes the leakage inductance of transformer as filter inductance L1, energy storage inductor L2 and filter capacitor C carries out impedance shunting to the high frequency switching ripple that electric current contains, filter capacitor C provides low impedance path for radio-frequency component, effectively reduce the high frequency content of output current like this, LCL filter-rectifier three-phase voltage type vector is:
The effective value of LCL filter-rectifier AC phase voltage first-harmonic, phase line voltage first-harmonic, phase current first-harmonic is respectively with U, E, I.U
lbe inductance both end voltage, ψ is system power factor, realize the four quadrant running of LCL filter-rectifier, need meet following relationship:
In formula, L
t=L+L
ffor the equivalent inductance of filter; Emp is electrical network phase voltage peak value; Imp is electrical network phase current peak value; Ump is rectifier input phase voltage first-harmonic peak value;
Finally can obtain the resonance frequency of filter:
Wherein:
The system of selection of LCL parameter L1, L2 and C, in LCL filter-rectifier model, the size of ripple depends on harmonic current in circuit, and inductance L 1/L2 is larger, ripple current is less, and larger L1/L2, L1+L2 can be made again to increase, and 1/C reduction can cause the current ripples in L1 to increase, be greater than 5 as Ll/L2 and be less than IO, simultaneously during <1/C<5, the volume of ripple and filter inductance can be made to reach compromise value, wherein C meets:
, in formula:
for fundamental frequency,
for power output.
The beneficial effects of the utility model
1) the utility model is using the leakage inductance of front end transformer itself as rear end filter inductance, substitutes L1 in LCL, provides cost savings, reduce the power consumption of follow-up rectifying part;
2) energy storage inductor L2 of the present utility model and filter capacitor C carries out impedance shunting to the high frequency switching ripple that electric current contains, and filter capacitor C provides low impedance path for radio-frequency component, effectively reduces the high frequency content of output current like this;
3) the utility model can be utilized to alternative filter inductance L1 with transformer leakage inductance and meets filter effect, the hardware cost of LCL circuit can be saved like this, the volume of rectifying part can also be reduced, in addition, total inductance value needed for LCL filter-rectifier is less than L filter, is therefore more suitable for applying on high-power, that switching frequency is lower current-control type grid-connection device.
Accompanying drawing explanation
Fig. 1 the utility model LCL filter-rectifier schematic diagram;
Fig. 2 the utility model LCL filter-rectifier three-phase voltage type polar plot;
The structure chart of Fig. 3 the utility model LCL filter-rectifier.
Embodiment
Shown in Fig. 1, Fig. 2 and Fig. 3, the size of the utility model volume determines primarily of the magnetic core of filter inductance.Multi-dimensional Scaling is wanted when selecting inductance parameters and magnetic core.Utilize resonance frequency as intermediate parameters, the attenuation ratio of calculating current harmonic wave is the quadratic equation of variable, by solving equation, can obtain other parameter of filter easily.
LCL filter-rectifier structural principle such as Fig. 1, Fig. 2 illustrate the phase voltage vector correlation of three-phase voltage type rectifier.Wherein U, E, I are respectively the effective value of LCL filter-rectifier AC phase voltage first-harmonic, phase line voltage first-harmonic, phase current first-harmonic.U
lit is inductance both end voltage.If system power factor is ψ, the four quadrant running of LCL filter-rectifier be realized, need following relationship be met:
In formula, L
t=L+L
ffor the equivalent inductance of filter; Emp is electrical network phase voltage peak value; Imp is electrical network phase current peak value; Ump is rectifier input phase voltage first-harmonic peak value;
Finally can obtain the resonance frequency of filter:
Wherein:
Be first need setting attenuation ratio coefficient, filter capacitor and total inductance value decisive equation whether to have normal solution, if there is no normal solution, need to change above 3 parameter values, until equation has normal solution.
Design LCL filter circuit is used for PWM rectification key and is to select rational LCL parameter, to make 26S Proteasome Structure and Function optimization.Devise LCL filter-rectifier model as shown in Figure 3.In switch converters, the size of ripple depends on harmonic current in circuit.Inductance L 1/L2 is larger, and ripple current is less, and larger L1/L2, L1+L2 can be made again to increase, and 1/C reduction can cause the current ripples in L1 to increase.
, in formula:
for fundamental frequency,
for power output
When Selection parameter, accept or reject according to actual needs.As 5<Ll/L2<IO and 2<1/C<5 time, the volume of ripple and filter inductance can be made to reach compromise value.Therefore relevant parameter is made to meet this condition when carrying out filter parameter design.Under certain ac output voltage condition, L is larger, then the ripple of output current is less, but in L, current changing rate also can diminish, and causes the follow-up control of electric current to weaken, makes cost increase simultaneously.Select L first will consider the pressure drop of first-harmonic on inductance, be generally 3% ~ 5% of output rated voltage; Secondly; make the effective value of harmonic current be about rectified current capacity 10% ~ 20%. otherwise rectifier may be excessive and enter guard mode due to harmonic current: last, consider the attenuation multiple index treating the interference harmonic frequency of filtering. can be tried to achieve by the transfer function of filter.The size of L is calculated according to following formula:
, in formula:
for DC voltage;
for switching tube frequency;
for ripple current.
In described system, adopt the leakage inductance of transformer, can first according to the leakage inductance value of transformer, as filter inductance L1, the energy storage inductor then matched according to theoretical formula method and filtering capacitance, finally form suitable LCL filter-rectifier.The utility model advantage is:
1) the PWM rectification unit of being powered separately by transformer, utilizes the leakage inductance of transformer itself to substitute filter inductance.
2) leakage inductance that make use of transformer can reduce the energy consumption of PWM rectifier itself.
3) leakage inductance that make use of transformer can reduce the volume and weight of PWM rectifier itself.
4) heat dissipation capacity of PWM rectification can be reduced, be convenient to cooling, reduce the energy consumption of cooling.
Claims (1)
1. one kind utilizes transformer leakage inductance as the PWM rectifier of LCL filtering, it is characterized in that: comprise transformer and LCL filter-rectifier, LCL filter-rectifier comprises LCL filter and PWM rectifier, transformer accesses from 10kV electrical network, LCL filter connects PWM rectifier, LCL filter-rectifier comprises energy storage inductor L2 and filter capacitor C, and energy storage inductor L2 and filter capacitor C links together.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520773952.7U CN204947891U (en) | 2015-10-08 | 2015-10-08 | A kind of transformer leakage inductance that utilizes is as the PWM rectifier of LCL filtering |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520773952.7U CN204947891U (en) | 2015-10-08 | 2015-10-08 | A kind of transformer leakage inductance that utilizes is as the PWM rectifier of LCL filtering |
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| Publication Number | Publication Date |
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| CN204947891U true CN204947891U (en) | 2016-01-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2591724A (en) * | 2019-11-25 | 2021-08-11 | Cambridge Entpr Ltd | A charger |
-
2015
- 2015-10-08 CN CN201520773952.7U patent/CN204947891U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2591724A (en) * | 2019-11-25 | 2021-08-11 | Cambridge Entpr Ltd | A charger |
| GB2591724B (en) * | 2019-11-25 | 2024-09-11 | Cambridge Entpr Ltd | A charger |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
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Effective date of registration: 20151228 Address after: 518049 Guangdong city of Shenzhen province Futian District Camry Factory 1, the entire 318 Patentee after: AUTOWAY, GUANGDONG ELECTRIC POWER CONSTRUCTION CO., LTD. Address before: 266000 Qingdao hi tech Industrial Development Zone, Qingdao National University Science Park, Shandong Patentee before: Qingdao Pike Energy Co.,Ltd. |
|
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: Longgang street community of Longgang District of Shenzhen City Tongde Guangdong province 518049 pit road No. 64 building two Patentee after: Shenzhen city and Wei Wei power Polytron Technologies Inc Address before: 518049 Guangdong city of Shenzhen province Futian District Camry Factory 1, the entire 318 Patentee before: AUTOWAY, GUANGDONG ELECTRIC POWER CONSTRUCTION CO., LTD. |