CN1862937A - Three-level integrated medium, high voltage frequency changer - Google Patents
Three-level integrated medium, high voltage frequency changer Download PDFInfo
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- CN1862937A CN1862937A CN 200610038466 CN200610038466A CN1862937A CN 1862937 A CN1862937 A CN 1862937A CN 200610038466 CN200610038466 CN 200610038466 CN 200610038466 A CN200610038466 A CN 200610038466A CN 1862937 A CN1862937 A CN 1862937A
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Abstract
The invention relates to the three electric levels integrated middle, high voltage frequency changer. It belongs to the electric power electron technology domain. It at least includes one set of three splitting step-down transformer, one set of the twelve pulse commutating unit, one set of the commutating absorbing unit, the fast protecting unit of the semiconductor switch apparatus of the mother line power, one set of the three electric level reverse changing unit having the function of power semiconductor device equaling the voltage automatically and the one set of the integration filtering booster unit. The invention solves the problem of high voltage frequency changer lacking of the bus power semiconductor switch device quick protecting unit.
Description
Technical field
The present invention relates to a kind of frequency converter, the present invention relates to a kind of three-level integrated middle and high voltage frequency changer more precisely.Belong to electric and electronic technical field.
Background technology
Middle and high voltage frequency changer has become a staple product of energy-saving field, be subjected to the withstand voltage restriction of power semiconductor switch, present middle and high voltage frequency changer mainly is to use the main circuit of IGBT device cascade system, this kind mode power semiconductor switch uses more, from improving the purpose of system reliability, should reduce the number of power semiconductor switch as far as possible.Simultaneously, IGBT belongs to that high break-over voltage falls, high switching loss class device, and the operational efficiency of integrated product is low.Adopt the middle and high voltage frequency changer of the main circuit of traditional three level modes; use the less power semiconductor switch device; but the quick protection to power semiconductor switch requires very high simultaneously; especially higher to the quick protection requirement of bus power semiconductor switch, this respect yet there are no relevant the argumentation both at home and abroad.
Owing to be subjected to the withstand voltage restriction of power semiconductor switch, use the middle and high voltage frequency changer output voltage of the main circuit of the traditional three level modes height that is not easy to do, even use the power semiconductor switch serial connection technology, its electric pressure is the highest can only to reach 6kV, just powerless for more high-tension application scenario, and, use the semiconductor device serial connection technology can bring a series of technical problem, be difficult to solve such as the stray inductance problem of all pressing problem, loop, Structure Designing Problem or the like.Improve output voltage as direct use step-up transformer, can bring problems such as the stability of a system, reliability again.Thereby, need to propose better solution for above problem.
Summary of the invention
The purpose of this invention is to provide a kind of integrated quick protected location of bus power semiconductor switch, the integrated three-level integrated middle and high voltage frequency changer of filtering boosting unit.
In order to reach above purpose, the present invention takes following technical scheme to realize:
Three-level integrated mesohigh frequency converter comprises at least one cover tripartition step-down transformer; At least one cover 12 impulse commutation unit; At least one cover rectification absorptive unit; The quick protected location of bus power semiconductor switch; At least one cover the is integrated tri-level inversion unit of power semiconductor switch automatically equalizing voltage function; The integrated filtering boosting unit of one cover.Its former edge joint of described tripartition step-down transformer is at the electrical network input, and its secondary connects 12 impulse commutation unit inputs; Its input of described 12 impulse commutation unit connects tripartition step-down transformer secondary, the quick protected location input of its output connection bus power semiconductor switch; Described rectification absorptive unit is connected in parallel on two ends, 12 impulse commutation unit; Its input of tri-level inversion unit of the integrated power semiconductor switch automatically equalizing voltage function of a described cover is connected the quick protected location output of bus power semiconductor switch, and its output is connected the input of integrated filtering boosting unit; Described integrated its input of filtering boosting unit is connected the output of the tri-level inversion unit of the integrated power semiconductor switch automatically equalizing voltage function of a cover, and its output is connected on the load motor end of incoming cables.
Aforesaid three-level integrated mesohigh frequency converter is characterized in that the quick protected location of wherein said bus power semiconductor switch, and this unit is made up of power semiconductor switch and piezo-resistance, pre-charge resistance in parallel thereof.
Aforesaid three-level integrated mesohigh frequency converter, it is characterized in that the wherein said integrated tri-level inversion unit of power semiconductor switch automatically equalizing voltage function, this unit is made up of 12 power semiconductor switches, 6 fast clamp diodes that recover.
Aforesaid three-level integrated mesohigh frequency converter, it is characterized in that wherein said integrated filtering boosting unit, this unit is made up of output filter transformer and filter capacitor, and the leakage reactance of output filter transformer constitutes low pass filter as filter reactance and filter capacitor.
Tripartition step-down transformer, 12 impulse commutation unit, tri-level inversion unit constitute traditional three-level converter.The designed rectification absorptive unit of the present invention constitutes capacitance-resistance by one group of resistance, electric capacity and absorbs network, can absorb the pulse shock of rectification unit, and steadily busbar voltage protects rectifier bridge not damage because of the surge voltage of electrical network; The quick protected location of designed bus, the puncture voltage of its piezo-resistance is greater than half of busbar voltage, less than whole busbar voltages, when needing the bus power semiconductor switch, turn-offs rapidly by frequency converter, when doing quick protection, this piezo-resistance has guaranteed that the bus power semiconductor switch does not damage; The designed integrated tri-level inversion unit of power semiconductor switch automatically equalizing voltage function recovers voltage that clamp diode guaranteed output semiconductor switch devices bear and is no more than the DC bus-bar voltage of half soon by six; Designed integrated filtering boosting unit, its step-up transformer leakage reactance is 5.6mH, filter capacitor is 50uF, the low-pass filter unit that constitutes 300Hz by the leakage reactance and the filter capacitor of step-up transformer.
The present invention solves the middle and high voltage frequency changer of IGBT device cascade system as main circuit, the problem that the power semiconductor switch number is more, reliability is low used; Solve the middle and high voltage frequency changer of traditional three level modes and lacked the quick protected location problem of bus power semiconductor switch; Solved the middle and high voltage frequency changer of traditional three level modes and lacked integrated filtering boosting unit, the output voltage problems such as height that are not easy to do; Designed the rectification absorptive unit, reduced influence the impact of device; The tri-level inversion unit of the integrated power semiconductor switch automatically equalizing voltage function of design has guaranteed that voltage that inversion unit body switching device born within limits; Better utilization the power output ability characteristics of power device, bring into play the ability of power device efficiently.Three-level integrated middle and high voltage frequency changer has enlarged the application of middle and high voltage frequency changer, has improved its reliability.
Description of drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is rectification absorptive unit (being the RCNET shown in a Fig. 1) circuit diagram
Fig. 3 is a filtering boosting unit schematic diagram
Embodiment
The three-level integrated middle and high voltage frequency changer of the present invention has as Figure 1-3 wherein comprised tripartition step-down transformer T1,12 impulse commutation unit, rectification absorptive unit, the quick protected location of bus power semiconductor switch, bus dc capacitor, integrated the tri-level inversion unit of power semiconductor switch automatically equalizing voltage function, integrated filtering boosting unit in the circuit diagram 1.
Among Fig. 1, the former limit of isolating transformer T1 Y connection, voltage between phases is 6000V; One group of y connection of secondary, one group of d connection, every kind of connection phase voltage between phases is 1900V.12 impulse commutation unit are made up of Da1～Da6 and Db1～Db6, and these 12 rectifier diodes are the device of withstand voltage 4500V.Just comprise among Fig. 1; negative two groups of quick protected locations of bus power semiconductor switch; every group by the bus power semiconductor switch; pre-charge resistance; piezo-resistance is formed; pre-charge resistance Rra; Rrb is at bus power semiconductor switch Sa; restriction bus charging current between Sb opens; avoid bus capacitor C1; C2 bears bigger impulse current; piezo-resistance Ra; Rb is at bus power semiconductor switch Sa; during Sb quick acting protection inversion unit; guarantee Sa; the voltge surge that Sb is less; piezo-resistance Ra; the puncture voltage of Rb is greater than half of busbar voltage, less than whole busbar voltages.Su1～Su4, Sv1～Sv4, Sw1～Sw4, Du1, Du2, Dv1, Dv, Dw1, Dw2, Ru, Rv, Rw has formed the tri-level inversion unit of power semiconductor switch automatically equalizing voltage function integrated, Su1～Su4 wherein, Sv1～Sv4, Sw1～Sw4 is 12 power semiconductor switches, rated insulation voltage is 4500V, Du1, Du2, Dv1, Dv, Dw1, Dw2 is 6 fast clamp diodes that recover, rated insulation voltage is 4500V, they guarantee Su1, Su2, Su3, Su4, Sv1, Sv2, Sv3, Sv4, Sw1, Sw2, Sw3, Sw4 avoids overvoltage less than half of busbar voltage.
Figure 2 shows that the circuit of rectification absorptive unit, Rca, Rcb, Ca, Cb constitute resistance-capacitance network, form the rectification absorptive unit with Raa, Rbb, Rn, avoid the impact of electrical network surge voltage to rectification unit, steadily busbar voltage.
Figure 3 shows that filtering boosting unit circuit theory diagrams, the former limit of step-up transformer T2 is the Y connection, mutually alternate rated voltage is 6000V, secondary is the d connection, and mutually alternate rated voltage is 6000V, and Lu, Lv, Lw are the leakage reactance that is folded to secondary of T2, value is 5.6mH, Cu, Cv, Cw value are 50uF, and Lu, Lv, Lw and Cu, Cv, Cw constitute the low pass filter of 300Hz, make three-level integrated middle and high voltage frequency changer harmonic wave of output voltage less than 5%.
In addition to the implementation, the present invention can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of requirement of the present invention.
Claims (4)
1, three-level integrated mesohigh frequency converter comprises at least one cover tripartition step-down transformer; At least one cover 12 impulse commutation unit; At least one cover rectification absorptive unit; The quick protected location of bus power semiconductor switch; At least one cover the is integrated tri-level inversion unit of power semiconductor switch automatically equalizing voltage function; The integrated filtering boosting unit of one cover; Its former edge joint of described tripartition step-down transformer is at the electrical network input, and its secondary connects 12 impulse commutation unit inputs; Its input of described 12 impulse commutation unit connects tripartition step-down transformer secondary, the quick protected location input of its output connection bus power semiconductor switch; Described rectification absorptive unit is connected in parallel on two ends, 12 impulse commutation unit; Its input of tri-level inversion unit of the integrated power semiconductor switch automatically equalizing voltage function of a described cover is connected the quick protected location output of bus power semiconductor switch, and its output is connected the input of integrated filtering boosting unit; Described integrated its input of filtering boosting unit is connected the output of the tri-level inversion unit of the integrated power semiconductor switch automatically equalizing voltage function of a cover, and its output is connected on the load motor end of incoming cables.
2, according to claims 1 described three-level integrated mesohigh frequency converter; it is characterized in that the quick protected location of wherein said bus power semiconductor switch, this unit is made up of power semiconductor switch and piezo-resistance, pre-charge resistance in parallel thereof.
3, according to claims 1 described three-level integrated mesohigh frequency converter, it is characterized in that the wherein said integrated tri-level inversion unit of power semiconductor switch automatically equalizing voltage function, this unit is made up of 12 power semiconductor switches, 6 fast clamp diodes that recover.
4, according to claims 1 described three-level integrated mesohigh frequency converter, it is characterized in that the integrated filtering boosting unit of a wherein said cover, this unit is made up of output filter transformer and filter capacitor, and the leakage reactance of output filter transformer constitutes low pass filter as filter reactance and filter capacitor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610038466 CN1862937A (en) | 2006-02-23 | 2006-02-23 | Three-level integrated medium, high voltage frequency changer |
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| CN 200610038466 CN1862937A (en) | 2006-02-23 | 2006-02-23 | Three-level integrated medium, high voltage frequency changer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895205A (en) * | 2010-07-27 | 2010-11-24 | 株洲南车时代电气股份有限公司 | Transducer |
| CN101197547B (en) * | 2006-12-06 | 2011-02-16 | 台达电子工业股份有限公司 | Three-phase synchronization AC generating circuit and its control method |
| CN104065260A (en) * | 2014-06-04 | 2014-09-24 | 华中科技大学 | High-voltage pulse charging device for mains supply |
| EP1995860A3 (en) * | 2007-05-25 | 2015-09-23 | General Electric Company | Protective circuit and method for multi-level converter |
-
2006
- 2006-02-23 CN CN 200610038466 patent/CN1862937A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101197547B (en) * | 2006-12-06 | 2011-02-16 | 台达电子工业股份有限公司 | Three-phase synchronization AC generating circuit and its control method |
| EP1995860A3 (en) * | 2007-05-25 | 2015-09-23 | General Electric Company | Protective circuit and method for multi-level converter |
| CN101895205A (en) * | 2010-07-27 | 2010-11-24 | 株洲南车时代电气股份有限公司 | Transducer |
| CN101895205B (en) * | 2010-07-27 | 2012-10-24 | 株洲南车时代电气股份有限公司 | Transducer |
| CN104065260A (en) * | 2014-06-04 | 2014-09-24 | 华中科技大学 | High-voltage pulse charging device for mains supply |
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