CN203722484U - 1750-V/3300-V dual-voltage three-level mining explosion-proof frequency conversion device - Google Patents
1750-V/3300-V dual-voltage three-level mining explosion-proof frequency conversion device Download PDFInfo
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- CN203722484U CN203722484U CN201420031606.7U CN201420031606U CN203722484U CN 203722484 U CN203722484 U CN 203722484U CN 201420031606 U CN201420031606 U CN 201420031606U CN 203722484 U CN203722484 U CN 203722484U
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- 238000006243 chemical reaction Methods 0.000 title abstract 2
- 238000005065 mining Methods 0.000 title abstract 2
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- 239000003990 capacitor Substances 0.000 abstract description 4
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Abstract
The utility model relates to a 1750-V/3300-V dual-voltage three-level mining explosion-proof frequency conversion device comprising a 12-pulse phase shifting transformer, a 12-pulse transformer, an input filter circuit, a pre-charge circuit, a 12-pulse rectifier circuit, a direct-current filter circuit, and an inverter output circuit. The secondary windings of the 12-pulse phase shifting transformer respectively use the star-shaped connection method and the triangular connection method; and two groups of 1750-V voltages with the 30-dgree output phase difference are outputted. The secondary winding of the 12-pulse transformer uses the dual-star-shaped parallel connection method; and two groups of 3300-V voltages with the same phases are outputted. The input filter is a smoothing reactor. The rectifier circuit can be divided into a series 12-pulse wave rectifier circuit and a parallel 12-pulse wave rectifier circuit, so that application demands with different voltage levels can be satisfied. The direct-current filter circuit uses thin-film capacitors and a series and parallel structure is employed. The inverter output circuit uses the diode clamped three-level inversion circuit. According to the scheme, the structure is simple; different voltage level requirements can be met; the pollution on the power grid by the harmonic wave can be substantially reduced; and the reliability is high.
Description
Technical field
The utility model relates to a kind of pair of voltage three level mine explosion-suppression converter plants, specifically, is two voltages three level mine flameproof and intrinsic safety AC converter of a kind of 1750V/3300V, 1600kW.
Background technology
Since nineteen fifty-seven thyristor invention, as specializing in the theory of transformation of electrical energy and control, the subject of methods and applications, power electronic technology has obtained swift and violent development, various convertor assemblys, as frequency converter, high frequency switch power and uninterrupted power supply, in all fields of national economy, obtained application widely.Conventionally, these convertor assemblys all need a rectification link, convert the alternating current of electrical network to galvanic form to carry out follow-up transformation of electrical energy processing.Diode not control rectifying circuit and Thyristor Controlled rectification circuit is the AC/DC rectification circuit the most often using in current industry.Although have advantages of that simple in structure and cost is low, there is following serious shortcoming in this circuit:
Input side current harmonics problem.Net side input current is non-sine, and harmonic content is high; This makes convertor assembly net side power factor low, and the harmonic component in non-sine input current do not transmit useful power, has increased idle and line loss, and a large amount of harmonic currents also can make net side input voltage distort.
DC ripple voltage is high.In VD, comprise more ripple, therefore need large DC filter capacitor to eliminate the ripple of DC voltage, this makes systems bulky, and overall cost increases.
Increase along with electric pressure and capacity requirement, two traditional level converters are owing to being subject to the withstand voltage restriction of power electronic power device to be difficult to meet the large capacity applications occasion of these mesohighs, directly use two level converters to realize high-voltage large-capacity and there is certain difficulty, and in high-voltage applications, the dv/dt of two level converter output voltages is very large, larger dv/dt can bring multiple harm, such as aggravating motor bearings electric current, aggravation cable insulation is aging, and high dv/dt will cause electromagnetic interference (EMI) problem simultaneously.
Summary of the invention
In order to solve the problems of the technologies described above, for the present situation of existing mine-used frequency-converter, with not enough, proposed a kind of simple in structurely, can meet different electric pressure requirements, the significantly pollution of harmonic reduction to electrical network, the mine flameproof and intrinsic safety AC converter that reliability is high.
The two voltage three level mine explosion-suppression converter plants of the utility model 1750V/3300V, comprise 12 pulse phase shifting transformers, input filter circuit, pre-charge circuit, 12 pulse wave rectifier circuit, DC filtering circuit, inverter output circuit.Line voltage is received input filter circuit by 12 pulse phase shifting transformers, pre-charge circuit is received in the output of input filter circuit, the output of pre-charge circuit accesses 12 pulse wave rectifier circuit, and the direct current of rectification circuit output is input to tri-level inversion circuit through DC filtering circuit.12 pulse phase shifting transformer secondary windings adopt respectively star and delta connection, and phase difference output is that 30 degree, size are two groups of voltages of 1750V.12 pulse transformer secondary winding adopt double star parallel connection method, and output phase is identical, size is two groups of voltages of 3300V.Input filter circuit is smoothing reactor; Rectification circuit can be divided into series connection 12 pulse wave rectifier circuit and 12 pulse wave rectifier circuit in parallel.When output voltage is 1750V, 12 pulse wave rectifier circuit adopt series connection 12 pulse wave rectifier circuit; When output voltage is 3300V, 12 pulse wave rectifier circuit adopt 12 pulse wave rectifier circuit in parallel.
Adopt the rectification circuit of these two kinds of structures can meet the application requirements of different electric pressures, reduce the harmonic content that exchanges input side electric current, thereby can improve to a certain extent power factor, also can reduce the harmonic amplitude in VD and improve ripple frequency simultaneously; DC filtering circuit is that thin-film capacitor adopts series parallel structure; Inverter output circuit is for adopting diode clamp type tri-level inversion circuit, the shutoff voltage that power device bears is exactly half of DC bus-bar voltage, power output can double, lower dv/dt can reduce electromagnetic interference, near also little many of harmonic amplitude switching frequency, line Voltage-output approaches sine wave makes the harmonic content of output voltage reduce by 50%.
Accompanying drawing explanation
Fig. 1 is the 1750V 12 pulse wave three level governing system block diagrams of connecting
Fig. 2 is 3300V 12 pulse wave three level governing system block diagrams in parallel
Fig. 3 is tri-level inversion circuit theory schematic diagram
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described:
As shown in Figure 1, when output voltage is 1750V, adopt series connection 12 pulse wave three level governing systems, mainly comprise 12 pulse phase shifting transformers, input filter circuit, pre-charge circuit, 12 pulse wave rectifier circuit, DC filtering circuit and inverter output circuit.
The course of work is: the 10kV voltage from electrical network is input to 12 pulse phase shifting transformers, and phase difference output is that 30 degree, size are two groups of voltages of 1750V; After input filter circuit, pre-charge circuit, enter 12 pulse wave rectifier circuit, now 12 pulse wave rectifier circuit are series connection.After 12 pulse wave rectifier circuit, alternating current changes into direct current, then passes through diode clamp type tri-level inversion circuit, finally direct current is changed into all variable of acs of amplitude, frequency, and then motor is carried out to speed regulating control.
As shown in Figure 2, when output voltage is 3300V, adopt 12 pulse wave three level governing systems in parallel, mainly comprise 12 pulse transformers, input filter circuit, pre-charge circuit, 12 pulse wave rectifier circuit, DC filtering circuit and inverter output circuit.
The course of work is: the 10kV voltage from electrical network is input to 12 pulse transformers, and phase difference output is that 30 degree, size are two groups of voltages of 3300V; After input filter circuit, pre-charge circuit, enter 12 pulse wave rectifier circuit, now 12 pulse wave rectifier circuit are in parallel.After 12 pulse wave rectifier circuit, alternating current changes into direct current, then passes through diode clamp type tri-level inversion circuit, finally direct current is changed into all variable of acs of amplitude, frequency, and then motor is carried out to speed regulating control.
Two kinds of circuit structures of Fig. 1 and Fig. 2 can both reduce the harmonic content that exchanges input side electric current, thereby can improve to a certain extent power factor, also can reduce the harmonic amplitude in VD and improve ripple frequency simultaneously; DC filtering circuit is that thin-film capacitor adopts series parallel structure; Inverter output circuit is for adopting diode clamp type tri-level inversion circuit, the shutoff voltage that power device bears is half of DC bus-bar voltage, power output can double, lower dv/dt can reduce electromagnetic interference, near also little many of harmonic amplitude switching frequency, line Voltage-output approaches sine wave makes the harmonic content of output voltage reduce by 50%.
Above illustrated embodiment is only with illustrating for convenience the utility model, and at technical scheme category described in the utility model, person of ordinary skill in the field does various simple deformation and modification, all should be included in above claim.
Claims (5)
1. the two voltage three level mine explosion-suppression converter plants of 1750V/3300V, is characterized in that: comprise 12 pulse phase shifting transformers, input filter circuit, pre-charge circuit, 12 pulse wave rectifier circuit, DC filtering circuit, inverter output circuit; Line voltage is received input filter circuit by 12 pulse phase shifting transformers, pre-charge circuit is received in the output of input filter circuit, the output of pre-charge circuit accesses 12 pulse wave rectifier circuit, and the direct current of rectification circuit output is input to tri-level inversion circuit through DC filtering circuit.
2. two voltage three level mine explosion-suppression converter plants of 1750V/3300V according to claim 1, it is characterized in that: 12 pulse phase shifting transformer secondary windings adopt respectively star and delta connection, phase difference output is that 30 degree, size are two groups of voltages of 1750V.
3. the two voltage three level mine explosion-suppression converter plants of 1750V/3300V according to claim 1, is characterized in that: 12 pulse transformer secondary winding adopt double star parallel connection method, and output phase is identical, size is two groups of voltages of 3300V.
4. the two voltage three level mine explosion-suppression converter plants of 1750V/3300V according to claim 1, is characterized in that: when output voltage is 1750V, 12 pulse wave rectifier circuit adopt series connection 12 pulse wave rectifier circuit; When output voltage is 3300V, 12 pulse wave rectifier circuit adopt 12 pulse wave rectifier circuit in parallel.
5. the two voltage three level mine explosion-suppression converter plants of 1750V/3300V according to claim 1, is characterized in that: inverter output circuit adopts diode clamp type tri-level inversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420031606.7U CN203722484U (en) | 2014-01-20 | 2014-01-20 | 1750-V/3300-V dual-voltage three-level mining explosion-proof frequency conversion device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420031606.7U CN203722484U (en) | 2014-01-20 | 2014-01-20 | 1750-V/3300-V dual-voltage three-level mining explosion-proof frequency conversion device |
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| CN203722484U true CN203722484U (en) | 2014-07-16 |
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| CN201420031606.7U Expired - Lifetime CN203722484U (en) | 2014-01-20 | 2014-01-20 | 1750-V/3300-V dual-voltage three-level mining explosion-proof frequency conversion device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333207A (en) * | 2014-11-18 | 2015-02-04 | 威海广泰空港设备股份有限公司 | Direct current power source device for photovoltaic inverter |
| CN107248819A (en) * | 2017-06-06 | 2017-10-13 | 郁清林 | A kind of 3300v frequency converters of use phase voltage converter technique |
| CN107302316A (en) * | 2016-04-14 | 2017-10-27 | 株式会社日立制作所 | Three level power conversion equipments |
| CN107395094A (en) * | 2017-09-07 | 2017-11-24 | 中国石油天然气集团公司 | A kind of simulation model of high-pressure frequency-conversion driving induction machine |
-
2014
- 2014-01-20 CN CN201420031606.7U patent/CN203722484U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333207A (en) * | 2014-11-18 | 2015-02-04 | 威海广泰空港设备股份有限公司 | Direct current power source device for photovoltaic inverter |
| CN107302316A (en) * | 2016-04-14 | 2017-10-27 | 株式会社日立制作所 | Three level power conversion equipments |
| CN107302316B (en) * | 2016-04-14 | 2019-08-16 | 株式会社日立制作所 | Three level power conversion equipments |
| CN107248819A (en) * | 2017-06-06 | 2017-10-13 | 郁清林 | A kind of 3300v frequency converters of use phase voltage converter technique |
| CN107395094A (en) * | 2017-09-07 | 2017-11-24 | 中国石油天然气集团公司 | A kind of simulation model of high-pressure frequency-conversion driving induction machine |
| CN107395094B (en) * | 2017-09-07 | 2023-08-08 | 中国石油天然气集团有限公司 | Simulation model of high-voltage variable-frequency driving induction motor |
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Address after: 063020 Torch Road, Tangshan City high tech Zone, Hebei, No. 183 Patentee after: CITIC HIC KAICHENG INTELLIGENCE EQUIPMENT Co.,Ltd. Address before: 063020 Torch Road, Tangshan City high tech Zone, Hebei, No. 183 Patentee before: TANGSHAN KAICHENG ELECTRONIC CONTROL EQUIPMENT GROUP Co.,Ltd. |
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Granted publication date: 20140716 |