CN202153710U - Novel non-harmonic electromagnetic stirring frequency conversion power supply distributing power supply by using phase-shifting transformer - Google Patents
Novel non-harmonic electromagnetic stirring frequency conversion power supply distributing power supply by using phase-shifting transformer Download PDFInfo
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- CN202153710U CN202153710U CN2011202866693U CN201120286669U CN202153710U CN 202153710 U CN202153710 U CN 202153710U CN 2011202866693 U CN2011202866693 U CN 2011202866693U CN 201120286669 U CN201120286669 U CN 201120286669U CN 202153710 U CN202153710 U CN 202153710U
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- power supply
- electromagnetic agitation
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- shifting transformer
- electromagnetic stirring
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Abstract
The utility model relates to the technical field of low voltage frequency converter, in particular to a novel non-harmonic electromagnetic stirring frequency conversion power supply distributing power supply by using phase-shifting transformers, comprising a power supply distribution cabinet (4), phase-shifting transformers (5), electromagnetic stirring frequency converters (6), an electromagnetic stirrer (8) and a frequency conversion power supply rectification unit (7), wherein the system is provided with at least two electromagnetic stirring frequency converters (6), the front end of the electromagnetic stirring frequency converters (6) is provided with at least two phase-shifting transformers (5) correspondingly connected with the electromagnetic stirring frequency converters (6), at the rear end of the electromagnetic stirring frequency converters (6) there is provided the electromagnetic stirrer (8), the power supply distribution cabinet (4) is arranged at the front end of the phase-shifting transformers (5), and the frequency conversion power supply rectification unit (7) is connected with the electromagnetic stirring frequency converters (6). On one hand, the novel non-harmonic electromagnetic stirring frequency conversion power supply distributing power supply by using phase-shifting transformers enables the harmonic pollution to the industrial power grid to be reduced, on the other hand the filter and the isolation transformer, etc., are omitted thereby reducing the equipment cost.
Description
Technical field
The utility model relates to the low voltage frequency converter technical field, refers in particular to a kind of novel no harmonic wave electromagnetic agitation frequency changing power device that adopts the phase shifting transformer decentralized power supply.
Background technology
The electromagnetic agitation frequency conversion power source special major part of domestic main flow is made up of a large-scale isolating transformer, N platform low voltage frequency converter etc., and on-the-spot continuous casting has N stream, and N platform electromagnetic agitation is just arranged.In low voltage frequency converter; The source that the electromagnetic agitation variable frequency power supply produces harmonic wave is a rectifying part; Rectification circuit adopts the uncontrollable bridge rectifier of 6 pulse diodes; Its output current still contains bigger higher harmonic components after handling through intermediate link, after these electric currents that contain high order harmonic component are injected into industrial electrical network, can cause very big harmonic pollution.And when electromagnetic agitation frequency conversion power source special input harmonics not being done any processing, it endangers as follows:
(1) makes the element in the utility network produce additional harmonic loss, influence the operate as normal of various electric equipments;
(2) cause parallel resonance and series resonance local in the utility network;
(3) cause the misoperation of relaying protection and automatics, and can make the electrical measurement metering instrument inaccurate;
(4) contiguous communication system is produced interference, produce noise, reduce communication quality.
Present stage, electromagnetic stirring system polluted very big to industrial electrical network, thereby causes a series of problem because electromagnetic agitation is indispensable part in the steel plant continuous casting equipment, and its economic loss is unable to estimate.In order to solve the harm of input harmonics, as adding filter at every frequency converter front end, harmonic carcellation, but cause equipment cost to rise, also brought a series of inconvenience to aspects such as producer's construction, maintenances.
Summary of the invention
The purpose of the utility model is to improve and innovate to the shortcoming that exists in the background technology and problem, and a kind of novel no harmonic wave electromagnetic agitation variable frequency power supply that adopts the phase shifting transformer decentralized power supply is provided.Native system carries out multipleization design at input and forms the multiple-pulse rectification, reduces input harmonics, need not to use filter can reach perfect input waveform.
The technical scheme of the utility model is a kind of novel no harmonic wave electromagnetic stirrer power supply that adopts the phase shifting transformer decentralized power supply of structure; Comprising power distribution panel, phase shifting transformer, electromagnetic agitation frequency converter, electromagnetic agitation and variable frequency power supply rectifying part, wherein:
System is provided with two electromagnetic agitation frequency converters at least; At at least two of the front end settings of electromagnetic agitation frequency converter phase shifting transformer with the corresponding connection of electromagnetic agitation frequency converter; In electromagnetic agitation frequency converter rear end the electromagnetic agitation frequency converter is set, the front end variable frequency power supply rectifying part that power distribution panel is arranged on phase shifting transformer connects the electromagnetic agitation frequency converter.
Advantage of the utility model and beneficial effect:
The utility model adopts the novel no harmonic wave electromagnetic agitation variable frequency power supply of phase shifting transformer decentralized power supply because phase shifting transformer is housed; Thereby cancellation the most harmonic waves in the input current; Therefore the High Power Factor characteristic that has kept diode rectifier circuit again has higher power factor.On the other hand, frequency converter is that voltage-source type low voltage frequency converter DC link is an electric capacity, and the reactive current that electromagnetic agitation needs is provided by electric capacity; And do not need to exchange with electrical network; The frequency converter input power factor is high, basically all greater than 0.95, in the whole scope of application, remains unchanged basically.Phase shifting transformer has the effect of isolation, and the special-purpose variable frequency power supply of electromagnetic agitation need not to refill isolating transformer.Adopt the novel no harmonic wave electromagnetic agitation variable frequency power supply of phase shifting transformer decentralized power supply to reduce the pollution of harmonic wave on the one hand, need not to use filter, isolating transformer etc. to reduce equipment cost on the other hand industrial electrical network.
Description of drawings
Fig. 1 is leading certain angle winding diagram of the utility model secondary winding and vectogram.
Fig. 2 is the utility model secondary winding hysteresis certain angle winding diagram and vectogram.
Fig. 3 is the utility model electromagnetic agitation variable frequency power supply major loop figure.
Fig. 4 is the utility model theory diagram.
Embodiment
Can know by Fig. 1 to 4; The utility model adopts the novel no harmonic wave electromagnetic agitation variable frequency power supply of phase shifting transformer decentralized power supply; It is characterized in that comprising power distribution panel 4, phase shifting transformer 5, electromagnetic agitation frequency converter 6, electromagnetic agitation 8 and variable frequency power supply rectifying part 7, wherein:
System is provided with two electromagnetic agitation frequency converters 6 at least; At at least two of the front end settings of electromagnetic agitation frequency converter 6 phase shifting transformer 5 with the 6 corresponding connections of electromagnetic agitation frequency converter; In electromagnetic agitation frequency converter 6 rear ends electromagnetic stirrer 8 is set, the front end variable frequency power supply rectifying part 7 that power distribution panel 4 is arranged on phase shifting transformer 5 connects electromagnetic agitation frequency converter 6.
Electromagnetic agitation frequency converter 6 comprises rectification circuit 1, intermediate dc link 2 and inverter circuit 3; Wherein rectification circuit 1 adopts the uncontrollable bridge rectifier of 6 pulse diodes, and the intermediate dc link adopts electrochemical capacitor C1 to carry out filtering and the direct current change exchanged with energy storage inverter circuit 3 again.
The operation principle of the utility model:
The utility model adds a phase shifting transformer at every electromagnetic agitation frequency converter front end and carries out the rectification of multipleization design formation multiple-pulse.When there is N platform electromagnetic agitation frequency converter at the scene, angle L=360 ° of ÷ M of the required skew of each winding of phase shifting transformer, [having N platform electromagnetic agitation special converter that M=6 * N impulse commutation just arranged].The operation principle of phase shifting transformer in the novel no harmonic wave electromagnetic agitation variable frequency power supply of employing phase shifting transformer decentralized power supply: a plurality of phase shift group utilization of phase shifting transformer is prolonged the limit star-star connection and is prolonged the phase angle that the limit phase shift obtains needs to both sides; Form certain phase difference (according to the difference of on-the-spot fluxion, we can derive the respective phase angle).Each phase shift group is respectively corresponding electromagnetic agitation inverter supply, has realized input multipleization effect, can be according to Fig. 1, and the angle of the leading required skew of secondary winding can be according to Fig. 2, the lag behind angle of required skew of secondary winding.
In the one-period of three-phase bridge rectifier circuit output voltage, six pulse waves are arranged, these six pulse waves on the phase angle mutually deviation 60 ° of angles.In the ideal case, then at-π/M ~ π/M in this interval, commutating voltage U=√ 2*cos ω t.The harmonic component of rectified current and commutating voltage all depends primarily on pulse number M and phase place.When N increased, the number of times of the minimum subharmonic of J increased (harmonic number: J=M ± 1), and the ripple factor of voltage reduces.In every variable frequency power supply device the three phase full bridge rectifying part is arranged, utilize the content of the mutual compensating action reduction harmonic wave of mains by harmonics.
Like Fig. 4, we are equipped with 1 power distribution panel, 3 phase shifting transformers according to on-the-spot continuous casting 3 streams, and 3 special-purpose variable frequency power supply groups of electromagnetic agitation become the special-purpose variable frequency power supply of a cover perfect harmony electromagnetic agitation.Form 18 pulse wave rectifier phase-shift systems, phase intervals is: 360 ° ÷ 18=20 °.Its wiring group meter phase shifting angle is respectively in order: Y, y11-20 °; Y, y11; Y, y11+20 °; Through phase shift, after bridge rectifier partly moves, except that fundamental current, all flow through K [K=N*18 ± 1 (N is an integer)] subharmonic current, and being N*9 ± 1 subharmonic current of odd number, K cancels out each other.
According to pulse number commonly used, the phase shifting angle option table of recommendation is following:
| Pulse number | Pulse wave at interval | Phase shifting angle |
| 6 | 60 ° | Y, y11; |
| 12 | 30 ° | Y, y11-20 °; Y, y11; |
| 18 | 20 ° | Y, y11-20 °; Y, y11; Y, y11+20 °; |
| 24 | 15 ° | Y, y11-30 °; Y, y11-15 °; Y, y11; Y, y11+15 °; |
| 30 | 12 ° | Y, y11-24 °; Y, y11-12 °; Y, y11; Y, y11+12 °; Y, y11+24 °; |
| 36 | 10 ° | Y, y11-30 °; Y, y11-20 °; Y, y11-10 °; Y, y11; Y, y11+10 °; Y, y11+20 °; |
Can derive following results theoretically:
6 impulse commutations: harmonic wave offsets automatically below 5 times;
12 impulse commutations: harmonic wave offsets automatically below 11 times;
18 impulse commutations: harmonic wave offsets automatically below 17 times;
24 impulse commutations: harmonic wave offsets automatically below 23 times;
30 impulse commutations: harmonic wave offsets automatically below 29 times;
36 impulse commutations: harmonic wave offsets automatically below 35 times;
…
The described embodiment of the utility model only is the description that the preferred implementation of the utility model is carried out; Be not that the utility model design and scope are limited; Under the prerequisite that does not break away from the utility model design philosophy, engineers and technicians make the technical scheme of the utility model in this area various modification and improvement all should fall into the protection range of the utility model; The technology contents that the utility model is asked for protection all is documented in claims.
Claims (1)
1. novel no harmonic wave electromagnetic agitation variable frequency power supply that adopts the phase shifting transformer decentralized power supply; It is characterized in that comprising power distribution panel (4), phase shifting transformer (5), electromagnetic agitation frequency converter (6), electromagnetic agitation (8) and variable frequency power supply rectifying part (7), wherein:
System is provided with two electromagnetic agitation frequency converters (6) at least; At at least two of the front end settings of electromagnetic agitation frequency converter (6) phase shifting transformer (5) with the corresponding connection of electromagnetic agitation frequency converter (6); In electromagnetic agitation frequency converter (6) rear end electromagnetic stirrer (8) is set, the front end variable frequency power supply rectifying part (7) that power distribution panel (4) is arranged on phase shifting transformer (5) connects electromagnetic agitation frequency converter (6).
2. the novel no harmonic wave electromagnetic agitation variable frequency power supply of employing phase shifting transformer decentralized power supply according to claim 1; It is characterized in that described power supply comprises rectification circuit (1), intermediate dc link (2) and inverter circuit (3); Wherein rectification circuit (1) adopts the uncontrollable bridge rectifier of 6 pulse diodes, and the intermediate dc link adopts electrochemical capacitor C1 to carry out filtering and the direct current change exchanged with energy storage inverter circuit (3) again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202866693U CN202153710U (en) | 2011-08-09 | 2011-08-09 | Novel non-harmonic electromagnetic stirring frequency conversion power supply distributing power supply by using phase-shifting transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202866693U CN202153710U (en) | 2011-08-09 | 2011-08-09 | Novel non-harmonic electromagnetic stirring frequency conversion power supply distributing power supply by using phase-shifting transformer |
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| Publication Number | Publication Date |
|---|---|
| CN202153710U true CN202153710U (en) | 2012-02-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202866693U Expired - Fee Related CN202153710U (en) | 2011-08-09 | 2011-08-09 | Novel non-harmonic electromagnetic stirring frequency conversion power supply distributing power supply by using phase-shifting transformer |
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| Country | Link |
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| CN (1) | CN202153710U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052305A (en) * | 2013-03-14 | 2014-09-17 | 通用电气公司 | Power conversion system |
| CN105406738A (en) * | 2015-12-23 | 2016-03-16 | 无锡江南计算技术研究所 | High-voltage rectification system for power supply to machine room |
| CN107896065A (en) * | 2017-11-21 | 2018-04-10 | 北京合力电气传动控制技术有限责任公司 | A kind of high-power high voltage frequency converter and its control method, device, system |
-
2011
- 2011-08-09 CN CN2011202866693U patent/CN202153710U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052305A (en) * | 2013-03-14 | 2014-09-17 | 通用电气公司 | Power conversion system |
| US9793827B2 (en) | 2013-03-14 | 2017-10-17 | Ge Energy Power Conversion Technology Ltd | Power conversion system and method |
| CN104052305B (en) * | 2013-03-14 | 2019-01-25 | 通用电气公司 | Power conversion system |
| CN105406738A (en) * | 2015-12-23 | 2016-03-16 | 无锡江南计算技术研究所 | High-voltage rectification system for power supply to machine room |
| CN105406738B (en) * | 2015-12-23 | 2017-11-14 | 无锡江南计算技术研究所 | High-voltage rectifying system for computer room power supply |
| CN107896065A (en) * | 2017-11-21 | 2018-04-10 | 北京合力电气传动控制技术有限责任公司 | A kind of high-power high voltage frequency converter and its control method, device, system |
| CN107896065B (en) * | 2017-11-21 | 2019-12-06 | 北京合力电气传动控制技术有限责任公司 | High-power high-voltage frequency converter and control method, device and system thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120229 Termination date: 20160809 |