CN205724904U - A kind of converter comprising PWM convertor circuit - Google Patents
A kind of converter comprising PWM convertor circuit Download PDFInfo
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- CN205724904U CN205724904U CN201620169024.4U CN201620169024U CN205724904U CN 205724904 U CN205724904 U CN 205724904U CN 201620169024 U CN201620169024 U CN 201620169024U CN 205724904 U CN205724904 U CN 205724904U
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- converter
- pwm
- outfan
- alternating current
- convertor circuit
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
This utility model discloses a kind of converter comprising PWM convertor circuit, and this circuit includes alternating current input and DC output end；The PWM convertor circuit being connected electrically between alternating current input and DC output end.The converter under-voltage protection when power system generation voltage dip of this utility model device is shut down and is administered; it is allowed to possess low voltage ride-through capability; simultaneously when line voltage is normal, it is possible to provide reactive power compensation and harmonic restraining function, eliminate the converter pollution to electrical network.
Description
Technical field
This utility model relates to converter low-voltage stoppage protection and converter power quality controlling circuit.More particularly, to a kind of converter comprising PWM convertor circuit.
Background technology
Converter, with its excellent speed adjusting performance and significant energy-saving effect, is widely applied in the industrial production.But the phenomenons such as voltage dip inevitably occur due to electrical network, causes converter that stoppage protection problem the most often occurs, and then cause driven motor out of service.Along with improving constantly of industrialization degree; production process is often automatization's consecutive production; each technological process closely cooperates; mutually coordinated; as long as wherein an equipment occurs that protection is shut down, the disorder of production process will be caused, even result in whole production line non-programmed halt; causing the biggest economic loss to enterprise, serious meeting causes personal injury and environmental pollution accident.Therefore, converter how is made to remain to when voltage dip occurs normally work and become a major issue urgently to be resolved hurrily.
Existing solution converter low-voltage stoppage protection problem realizes often through additional equipment; as installed uninterrupted power source UPS (Uninterruptible Power Supply), dynamic electric voltage recovery device DVR (Dynamic Voltage Restorer), solid converting switch SSTS (Solid State Transfer Switch), DC-BANK etc. additional, but all there is certain drawback in these schemes.
Uninterrupted power source UPS:UPS is the important external equipment that power supply lasting, stable, continual can be provided to supply.Its structure is more complicated, but perfect performance, its distinguishing feature is can to continue zero interruptedly to export pure sine wave alternating current, it is possible to solve the power issues such as spike, surge, frequency drift.But when installing UPS additional before converter, desired volume is relatively big, and cost of investment is high, and the conversion efficiency of UPS self is low, and uses battery, and reliability exists certain risk, and only a few producer makes in this way simultaneously.
Dynamic electric voltage recovery device DVR:DVR device is by being connected between sensitive load and system, promptly compensate for the faults such as the voltage dip in electrical network, concussion, improve the quality of power supply of user side, be to ensure that the effective way that sensitive industrial equipment is not affected by voltage dip.DVR has the advantage above economy relative to UPS, can save production cost, but also have fatal weakness, the time that i.e. compensates exceedes more than several seconds then cannot continue to compensate, and when line voltage is less than specified less than 50%, or when interrupting completely, DVR just cannot employ.
Solid converting switch SSTS: solid converting switch SSTS based on advanced semiconductor switch technology, it is possible to realizing being switched fast between dual power supply, switching time controls within 20ms.But the effective premise of SSTS scheme is that duplex feeding power supply is separate, wherein during a road power failure, an other road power supply must be normal, and in systems in practice, the occasion possessing two-way independent current source completely is little, and therefore, the use of the program is restricted.
DC-BANK:DC-BANK uses the method that frequency changer direct current bus is carried out voltage support, and energy storage device uses accumulator, and when voltage dip, accumulator releases energy and carries out voltage support, thus avoids converter protection to shut down.The effective premise of the program is that accumulator property is reliable, but in actual applications, accumulator often can not get effectively safeguarding, just finds that when there is voltage dip accumulator actual performance does not reaches far away design requirement, even there will be the accidents such as accumulator explosion.Accumulator, as unique one life line, but cannot play " saving one's life " effect at crucial moment.Additionally the life of storage battery is short, and average life typically only has 2-3, changes maintenance cost high, takies volume bigger simultaneously.If use other energy storage materials such as ultracapacitor, cost can be higher.
For the above-mentioned problems in the prior art, special proposition this utility model.
Utility model content
The purpose of this utility model is to provide a kind of converter comprising PWM convertor circuit.
For reaching above-mentioned purpose, this utility model employing following technical proposals:
A kind of PWM convertor circuit, described circuit includes:
Alternating current input and DC output end；
It is connected electrically in the PWM converter between alternating current input and DC output end.
Further, described circuit also includes: three-phase reactor, and the input of described three-phase reactor is connected with alternating current input, and the outfan of described three-phase reactor is connected with the input of described PWM converter.
Further, described circuit also includes: the first DC support electric capacity, and the described two ends of the first DC support electric capacity are connected in parallel with the outfan of described PWM converter.
Further, described circuit also includes: semiconductor switch, described semiconductor switch is connected between positive pole and the positive pole of DC output end of described PWM converter outfan, wherein the anode of semiconductor switch and the positive pole of described PWM converter outfan connect, and the negative electrode of semiconductor switch and the positive pole of DC output end connect.
A kind of converter, between the alternating current input and the dc bus PN end of described converter of described converter in parallel described in PWM convertor circuit, the alternating current input of described PWM convertor circuit is connected with the alternating current input of described converter, and the DC output end of described PWM convertor circuit is connected with the dc bus PN end of described converter.
Further, described converter includes: rectification unit and inversion unit, the input of described rectification unit is the alternating current input of described converter, the outfan of described rectification unit is the dc bus PN end of described converter, the outfan of described rectification unit is connected with the input of described inversion unit, and the outfan of described inversion unit is the outfan of described converter.
Further, described converter also includes: the second DC support electric capacity, and the described two ends of the second DC support electric capacity are connected in parallel with the outfan of described rectification unit.
A kind of equipment comprising converter as above, the motor at described equipment electrically connects described converter between outside three phase network.
The beneficial effects of the utility model are as follows:
DC bus-bar voltage support, active power filtering and three kinds of functions of reactive-load compensation of converter are integrated by PWM convertor circuit of the present utility model, converter can be maintained when line voltage drops temporarily properly functioning, when line voltage is normal, converter can be carried out active power filtering and reactive-load compensation again.Compared with the solution such as conventional uninterrupted power source UPS, dynamic electric voltage recovery device DVR, solid converting switch SSTS, DC-BANK, perfect in shape and function, cost performance is high.
Accompanying drawing explanation
Fig. 1 is the main circuit topological structure schematic diagram of the Power Quality Comprehensive Treatment Device of this utility model converter.
In figure, 1-converter；2-PWM convertor circuit；3-three phase network；4-motor；11-rectification unit；12-the second DC support electric capacity；13-inversion unit；21-three-phase reactor；22-PWM current transformer；23-the first DC support electric capacity；24-semiconductor switch.
Detailed description of the invention
In order to be illustrated more clearly that this utility model, below in conjunction with preferred embodiments and drawings, this utility model is described further.
As it is shown in figure 1, a kind of PWM convertor circuit, this circuit includes:
Alternating current input and DC output end；
The PWM converter 22 being connected electrically between alternating current input and DC output end, also includes: three-phase reactor the 21, first DC support electric capacity 23 and semiconductor switch 24；The input of three-phase reactor 21 is connected with alternating current input, and the outfan of three-phase reactor 21 is connected with the input of PWM converter 22；The two ends of the first DC support electric capacity 23 are connected in parallel with the outfan of PWM converter 22；Semiconductor switch 24 is connected between positive pole and the positive pole of DC output end of PWM converter 22 outfan, and the anode of semiconductor switch 24 and the positive pole of PWM converter 22 outfan connect, and the negative electrode of semiconductor switch 24 and the positive pole of DC output end connect；DC output end is connected with the dc bus PN end of external equipment converter 1.
A kind of converter, in parallel between the input and the dc bus PN end of converter 1 of converter 1 described in PWM convertor circuit；Converter 1 includes rectification unit 11 and inversion unit 13, the input of rectification unit 11 is the input of converter 1, the outfan of rectification unit 11 is frequency changer direct current bus PN end, the outfan of rectification unit 11 is connected with the input of inversion unit 13, the outfan of inversion unit 13 is the outfan of converter 1, and the outfan of converter 1 is connected with motor 4.
Converter 1 also includes that the second DC support electric capacity 12, the two ends of the second DC support electric capacity 12 are connected in parallel with the dc bus PN end of the outfan of rectification unit 11, i.e. converter 1.
To be connected with motor 4 containing the converter 1 of described PWM convertor circuit, one end of three-phase reactor 21 and the input of converter 1 are in parallel, common access three phase network 3, the other end is connected to the AC of PWM converter 22, after DC side parallel the first DC support electric capacity 23 of PWM converter 22, in parallel through the dc bus PN end of semiconductor switch 24 and converter 1, by the control realization of semiconductor switch 24 voltage support to the dc bus of converter 1, converter 1 is by rectification unit 11, DC support electric capacity 12 and inversion unit 13 3 part composition, the input of converter 1 is connected to three phase network 3, outfan is connected to motor 4, rectification unit 11 in the present embodiment uses commutator, inversion unit 13 uses inverter.
Three-phase reactor 21 in the present embodiment also can use transformator to replace, and semiconductor switch 24 is in addition to half control device IGCT, it is also possible to use other semiconductor switch device, including full-controlled device.
One end of the three-phase reactor 21 of PWM convertor circuit of the present utility model and the input of converter 1 are in parallel, common access three phase network 3, the other end of three-phase reactor 21 is connected to the AC of PWM converter 22, after DC side parallel first Support Capacitor 23 of PWM converter 22, in parallel, by the control realization of semiconductor switch 24 voltage support to converter 1 dc bus through the dc bus PN end of semiconductor switch 24 and converter 1.Described PWM convertor circuit has two kinds of mode of operations; when electrical network generation voltage dip, PWM convertor circuit is operated in rectification mode, quickly charges to the dc bus of converter 1; there is provided energy to support it, thus avoid busbar voltage to drop to set thresholding and protect shutdown；When line voltage is normal, PWM convertor circuit is operated in inverter mode, it is provided that additional power quality controlling function, and electrical network i.e. carries out active power filtering and reactive-load compensation, eliminates harmonic wave that electrical network causes by converter 1 and power factor is low waits pollution.
Obviously; above-described embodiment of the present utility model is only for clearly demonstrating this utility model example; and it is not the restriction to embodiment of the present utility model; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot all of embodiment be given exhaustive, every belong to obvious change that the technical solution of the utility model extended out or the variation row still in protection domain of the present utility model.
Claims (2)
- null1. the converter comprising PWM convertor circuit，It is characterized in that: between the alternating current input and the dc bus PN end of described converter of described converter, be parallel with PWM convertor circuit，Described converter includes rectification unit and inversion unit，The input of described rectification unit is the alternating current input of described converter，The outfan of described rectification unit is the dc bus PN end of described converter，The outfan of described rectification unit is connected with the input of described inversion unit，The outfan of described inversion unit is the outfan of described converter，The alternating current input of described PWM convertor circuit is connected with the alternating current input of described converter，The DC output end of described PWM convertor circuit is connected with the dc bus PN end of described converter，Described PWM convertor circuit includes alternating current input and DC output end；Also include the PWM converter being connected electrically between alternating current input and DC output end, three-phase reactor, first DC support electric capacity and semiconductor switch, the input of described three-phase reactor is connected with alternating current input, the outfan of described three-phase reactor is connected with the input of described PWM converter, the described two ends of the first DC support electric capacity are connected in parallel with the outfan of described PWM converter, described semiconductor switch is connected between positive pole and the positive pole of DC output end of described PWM converter outfan, wherein the anode of semiconductor switch and the positive pole of described PWM converter outfan connect, the negative electrode of semiconductor switch and the positive pole of DC output end connect.
- Converter the most according to claim 1, it is characterised in that described converter also includes: the second DC support electric capacity, the described two ends of the second DC support electric capacity are connected in parallel with the outfan of described rectification unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620169024.4U CN205724904U (en) | 2016-03-07 | 2016-03-07 | A kind of converter comprising PWM convertor circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620169024.4U CN205724904U (en) | 2016-03-07 | 2016-03-07 | A kind of converter comprising PWM convertor circuit |
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| CN205724904U true CN205724904U (en) | 2016-11-23 |
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| CN201620169024.4U Active CN205724904U (en) | 2016-03-07 | 2016-03-07 | A kind of converter comprising PWM convertor circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968390A (en) * | 2017-11-01 | 2018-04-27 | 李宝华 | A kind of Lightning Electromagnetic Pulse energy absorption filtering system |
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2016
- 2016-03-07 CN CN201620169024.4U patent/CN205724904U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968390A (en) * | 2017-11-01 | 2018-04-27 | 李宝华 | A kind of Lightning Electromagnetic Pulse energy absorption filtering system |
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