CN101621255A - Cascade connection energy-regenerative type high-voltage converter - Google Patents
Cascade connection energy-regenerative type high-voltage converter Download PDFInfo
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- CN101621255A CN101621255A CN200910184413A CN200910184413A CN101621255A CN 101621255 A CN101621255 A CN 101621255A CN 200910184413 A CN200910184413 A CN 200910184413A CN 200910184413 A CN200910184413 A CN 200910184413A CN 101621255 A CN101621255 A CN 101621255A
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Abstract
The invention discloses a cascade connection energy-regenerative type high-voltage converter consisting of a multiwinding rectifier transformator, three groups of N power units with single-phase input, and a control system. The multiwinding rectifier transformator adopts primary three-phase delta input and secondary three-group N single-phase voltage output, and each secondary winding is connected with the input end of one power unit. Each phase output of the high- voltage converter is formed by cascade connection of the output ends of N power units, and star connection is adopted among three phases. The power unit mainly comprises an H bridge rectification circuit consisting of IGBT, a capacitance filter circuit, an H bridge inverter circuit consisting of IGBT, a bypass circuit and a unit control circuit. The control system of the high- voltage converter is connected with a control circuit of each power unit through optical fibers in the manner of a star network. The power unit of the invention adopts a single-phase controllable rectifier bridge different from that of the traditional type, thereby having an energy feedback function, and further broadening the application of the cascade connection energy-regenerative type high- voltage converter.
Description
Technical field
The present invention relates to the high-vol field, relate in particular to and a kind ofly can present formula cascaded high-voltage current transformer.
Background technology
Along with the progress of power electronic technology, the high-voltage and high-power power electronic technology has obtained application more and more widely in electric power system.China is energy resource consumption big country, and efficiency of energy utilization is relatively very low, so the application of energy-conservation equipment such as current transformer is particularly crucial.China current transformer market is in the period of a rapid growth at present, and is used widely in industries such as universal machine, metal lathe, air-conditioning, elevator, metallurgy, and is playing an increasingly important role.Particularly, the application of high-power high voltage current transformer is increasingly extensive.
The cascaded high-voltage current transformer need not high voltage power device with it, be easy to improve advantages such as output voltage grade and output current harmonics are low and solved the electric machine speed regulation problem of high pressure high power load occasions such as blower fan, pump class well, and obtained obvious energy-saving effect.But traditional cascaded high-voltage current transformer based on uncontrollable rectifier bridge power cell exists input current that electrical network is produced serious harmonic pollution, energy can only one-way flow, can't be applied to the problems such as load occasion that mine hoist etc. requires the energy two-way flow, limit its further application.
Summary of the invention
Technical problem: the objective of the invention is to propose a kind of cascade connection energy-regenerative type high-voltage converter, it can be in the input current near sinusoidal, when the high-tension motor of load is in the regenerative braking state, Way of Regenerating Energy Feedback is arrived electrical network, guarantee the safe and reliable operation of electric motor system, and then expanded the application scenario.
Technical scheme: the present invention realizes on the basis of improving traditional power cell.For each cascade unit, replaced uncontrollable rectifier bridge with the single-phase PWM rectifier, and original H bridge inverter remains unchanged.By the two-way characteristics such as controlled of the good input current control characteristic of PWM rectifier and energy, realize the energy feedback of high-voltage motor system.By the rectifier transformer parallel connection, the output cascade has promptly constituted energy cascade converter with each power cell input.Cascade connection energy-regenerative type high-voltage converter by many windings rectifier transformer, several can present the formula power unit module and control system constitutes.
Cascade connection energy-regenerative type high-voltage converter of the present invention comprises the power cell of many windings rectifier transformer, 3 groups and every group N single-phase inputs; The three-phase triangle input on the former limit of described many windings rectifier transformer is inserted by grid side, the secondary winding has 3 groups * N and each secondary winding to be connected with the input of a power cell, every output mutually by the N in this group power cell output cascade of high-vol forms, adopt wye connection between the three-phase, wherein: N=V1/V2, V1 is the output voltage that current transformer needs, and V2 is the output voltage of power cell.
Described power cell comprises: promptly an IGBT, the 2nd IGBT, the 3rd IGBT, the 4th IGBT form H bridge controlled rectification circuit to four rectification IGBT, the input of rectification circuit is attached to ac input end by fuse, inductance respectively, and the output of rectification circuit is attached to the capacitor filter two ends of parallel resistor and electric capacity composition; Four rectification IGBT are that the 5th IGBT, the 6th IGBT, the 7th IGBT, the 8th IGBT form the H bridge inverter circuit, and the input of inverter circuit is attached to the two ends of capacitor filter, and output is connected to bypass circuit.
Many windings rectifier transformer adopts the three-phase triangle input of former limit, 3 groups of N single-phase voltage outputs of secondary, and wherein first group of winding of secondary comprises a by former sideline voltage AB transformation
11b
11, a
12b
12, a
13b
13A
1Nb
1NSecond group of winding comprises b by former sideline voltage BC transformation
21c
21, b
22c
22, b
23c
23... b
2Nc
2NThe 3rd group of winding comprises c by former sideline voltage CA transformation
31a
31, c
32a
32, c
33a
33... c
3Na
3NMutually insulated between each secondary winding of transformer; Each power cell maximum output voltage be V and secondary according to three groups of sequence arrangement, then insulation voltage must not be less than N * V between the group of secondary winding.
Described by-pass unit comprises: promptly first rectifier diode, second rectifier diode, the first rectification triode, the 4th rectifier diode are formed uncontrollable bypass rectifying H bridge to four rectifier diodes, the input of bypass rectifying H bridge is attached on the output of inverter circuit, the positive and negative electrode of bypass rectifying H bridge is connected respectively to the positive and negative utmost point of thyristor, and be connected with resistance at the thyristor two ends, RC circuit that electric capacity is formed.
Beneficial effect:
(1) by the PWM rectifier is incorporated in the cascade unit, can realize the energy feedback function of high-vol.Adopt the high-vol input current sine of this scheme good, move with the approximate unit power factor; When the asynchronous motor of using was in regenerative power generation state, input current was anti-phase automatically, and energy flows to electrical network from motor, and kept busbar voltage constant, had guaranteed the system safety reliability service.Output speed, torque are changed steadily, can produce regenerative brake torque fast, it is stable that system reaches very soon.
(2) control system of high-vol adopts optical fiber and power cell communication, has guaranteed reliable electrical isolation, thereby has made the digital control part of high-vol to work safely.
(3) in circuit design, each power cell all is equipped with by-pass unit, in case break down, circuit can automatically switch to bypass, and having realized not influencing whole system operation because of the fault of certain or certain several power cells.
Description of drawings
The present invention is described further below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of cascade connection energy-regenerative type high-voltage converter;
Fig. 2 is the internal structure schematic diagram figure of power cell;
Fig. 3 is the connected mode schematic diagram of control system and each power cell;
Embodiment
As shown in Figure 1, cascade connection energy-regenerative type high-voltage converter of the present invention can be presented formula power unit module 2 by 1,3 groups of N of many windings rectifier transformer and control system constitutes.
Many windings rectifier transformer 1 adopts the three-phase triangle input of former limit, 3 groups of N single-phase voltage outputs of secondary, and wherein first group of winding of secondary comprises a by former sideline voltage AB transformation
11b
11, a
12b
12, a
13b
13A
1Nb
1NSecond group of winding comprises b by former sideline voltage BC transformation
21c
21, b
22c
22, b
23c
23... b
2Nc
2NThe 3rd group of winding comprises c by former sideline voltage CA transformation
31a
31, c
32a
32, c
33a
33... c
3Na
3NMutually insulated between each secondary winding of transformer, suppose each power cell maximum output voltage be V and secondary according to three groups of sequence arrangement, then insulation voltage must not be less than N * V between the group of secondary winding.
Three-phase electricity is inserted from grid side in the former limit of multi winding transformer, and each winding of secondary is connected with a power cell.First group of winding a
11b
11, a
12b
12, a
13b
13A
1Nb
1NRespectively access power in parallel unit A1, A2, A3 ... AN, the outlet side cascade of this N power cell is to form the A phase of output.B, C mutually herewith, three-phase connects in star-like mode then, thereby forms three-phase A ', B ', the C ' of outlet side.
As shown in Figure 2, the power cell of this high-vol comprises: by IGBT constitute H bridge rectification circuit 3, capacitor filter 4, H bridge inverter circuit 5, bypass circuit 6, unit controls circuit 7, fuse 8, inductance 9 and the radiator that constitutes by IGBT.
Wherein, rectification circuit 3 and inverter circuit 5 are all formed the H bridge circuit by IGBTQ1-Q8, and each IGBT all has diode antiparallel with it, protect IGBT with this.
The capacitor filter 4 of power cell adopts the structure of RC parallel connection, the series connection electrolysis capacitor array and the balance resistance that also can adopt many group parallel waies to be connected.Because the voltage withstand class of electrochemical capacitor is lower, when the power cell DC side reaches kv, have only the series system of employing withstand voltage, but series connection back equivalent capacitance value can reduce to improve, so adopt the mode of many group series capacitances parallel connection, and adopt the voltage on balanced each series capacitance of balance resistance.
The by-pass unit 6 of power cell comprises thyristor S1, single-phase diode rectifier bridge D1-D4 and RC circuit R2, C2 in parallel.The RC circuit is used for the smooth voltage waveform and reduces the du/dt of output, guarantee thyristor conducting reliably, and the adjection of resistance R 2 also is used for discharging the electric charge of capacitor C 2 after current transformer is out of service.
The unit controls circuit 7 of power cell is mainly used in the instruction of accepting control system, the break-make of controlling this unit IGBT and the running of bypass, and the error message coding of this unit is uploaded to control system.
Also comprise fuse 8 and inductance 9 in the power cell, fuse 8 is used for the overcurrent protection of input side, and inductance 9 is used for the current harmonics of filtering net side.
As shown in Figure 3, the control system of high-vol is used to control the Collaboration of each power cell of high-vol, it is connected with each power cell by the mode of optical fiber with Star Network, what wherein link to each other with each power cell has two groups of optical fiber, one group is that 10, one groups of descending control optical fiber are uplink information feedback optical fiber 11.
Claims (4)
1, a kind of cascade connection energy-regenerative type high-voltage converter is characterized in that: this current transformer comprises the power cell (2) of many windings rectifier transformer (1), 3 groups and every group N single-phase inputs; The three-phase triangle input on the former limit of described many windings rectifier transformer (1) is inserted by grid side, the secondary winding has 3 groups * N and each secondary winding to be connected with the input of a power cell (2), every output mutually by the N in this group power cell output cascade of high-vol forms, adopt wye connection between the three-phase, wherein: N=V1/V2, V1 is the output voltage that current transformer needs, and V2 is the output voltage of power cell.
2, cascade connection energy-regenerative type high-voltage converter according to claim 1, it is characterized in that: described power cell (2) comprising: promptly an IGBT (Q1), the 2nd IGBT (Q2), the 3rd IGBT (Q3), the 4th IGBT (Q4) form H bridge controlled rectification circuit (3) to four rectification IGBT, the input of rectification circuit (3) is attached to ac input end by fuse (8), inductance (9) respectively, and the output of rectification circuit (3) is attached to capacitor filter (4) two ends of parallel resistor (R1) and electric capacity (R1) composition; Promptly the 5th IGBT (Q5), the 6th IGBT (Q6), the 7th IGBT (Q7), the 8th IGBT (Q8) form H bridge inverter circuit (5) to four rectification IGBT, the input of inverter circuit (5) is attached to the two ends of capacitor filter (4), and output is connected to bypass circuit (6).
3, cascade connection energy-regenerative type high-voltage converter according to claim 1, it is characterized in that: many windings rectifier transformer (1) adopts the three-phase triangle input of former limit, 3 groups of N single-phase voltage outputs of secondary, wherein first group of winding of secondary comprises a by former sideline voltage AB transformation
11b
11, a
12b
12, a
13b
13A
1Nb
1NSecond group of winding comprises b by former sideline voltage BC transformation
21c
21, b
22c
22, b
23c
23... b
2Nc
2NThe 3rd group of winding comprises c by former sideline voltage CA transformation
31a
31, c
32a
32, c
33a
33... c
3Na
3NMutually insulated between each secondary winding of transformer; Each power cell maximum output voltage be V and secondary according to three groups of sequence arrangement, then insulation voltage must not be less than N * V between the group of secondary winding.
4, cascade connection energy-regenerative type high-voltage converter according to claim 1, it is characterized in that described by-pass unit (6) comprising: four rectifier diodes are first rectifier diode (D1), second rectifier diode (D2), the first rectification triode (3), the 4th rectifier diode (D4) is formed uncontrollable bypass rectifying H bridge, the input of bypass rectifying H bridge is attached on the output of inverter circuit (5), bypass rectifying H bridge just, negative pole is connected respectively to the sun of thyristor (S1), negative electrode, and be connected with resistance (R2) at thyristor (S1) two ends, the RC circuit that electric capacity (C2) is formed.
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| CN2009101844139A CN101621255B (en) | 2009-08-06 | 2009-08-06 | Cascade connection energy-regenerative type high-voltage converter |
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| CN2009101844139A CN101621255B (en) | 2009-08-06 | 2009-08-06 | Cascade connection energy-regenerative type high-voltage converter |
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| CN101621255A true CN101621255A (en) | 2010-01-06 |
| CN101621255B CN101621255B (en) | 2012-05-23 |
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| CN102075097A (en) * | 2010-11-29 | 2011-05-25 | 江苏省电力公司泰州供电公司 | Method for controlling n+1 fault redundancy of cascade type converter |
| CN102130611A (en) * | 2011-04-08 | 2011-07-20 | 东南大学 | Power electronic rectification transformer |
| CN102267405A (en) * | 2011-05-09 | 2011-12-07 | 株洲变流技术国家工程研究中心有限公司 | Energy feeding type dragging power supply device and control method thereof |
| CN102916590A (en) * | 2011-08-04 | 2013-02-06 | 宏远创建有限公司 | One-phase-to-triphase economizer |
| CN103675539A (en) * | 2013-11-27 | 2014-03-26 | 广州智光电气股份有限公司 | Cascaded energy storage converter detecting platform and control method thereof |
| CN105790598A (en) * | 2016-04-20 | 2016-07-20 | 中国船舶重工集团公司第七〇二研究所 | Highly-reliable main circuit topological structure of railway ground deflector |
| CN106452101A (en) * | 2016-08-23 | 2017-02-22 | 重庆大学 | Electronic voltage regulator |
| CN106533198A (en) * | 2016-12-28 | 2017-03-22 | 苑雪飞 | High-frequency transformer-based railway purification power supply device |
| CN108923664A (en) * | 2018-05-29 | 2018-11-30 | 中国科学院电工研究所 | Three-phase input single-phase output frequency changer and control strategy |
| CN109039097A (en) * | 2018-09-14 | 2018-12-18 | 西门子电气传动有限公司 | Method for controlling frequency conversion, device, bank electricity system and storage medium |
| CN110224430A (en) * | 2019-06-11 | 2019-09-10 | 新风光电子科技股份有限公司 | A kind of DC3000V can present device and its control method |
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| CN107809181B (en) * | 2017-10-12 | 2019-11-29 | 南京航空航天大学 | A kind of Mixed cascading H bridge rectifier for being 1:2 for output voltage |
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| CN1988351A (en) * | 2006-12-07 | 2007-06-27 | 上海交通大学 | Cascade multiple zero matrix converter |
| CN101447742A (en) * | 2008-09-11 | 2009-06-03 | 山东泰开自动化有限公司 | Single-phase voltage-dividing multilevel unit-in-series high-voltage converter |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102075097A (en) * | 2010-11-29 | 2011-05-25 | 江苏省电力公司泰州供电公司 | Method for controlling n+1 fault redundancy of cascade type converter |
| CN102130611A (en) * | 2011-04-08 | 2011-07-20 | 东南大学 | Power electronic rectification transformer |
| CN102267405A (en) * | 2011-05-09 | 2011-12-07 | 株洲变流技术国家工程研究中心有限公司 | Energy feeding type dragging power supply device and control method thereof |
| CN102916590A (en) * | 2011-08-04 | 2013-02-06 | 宏远创建有限公司 | One-phase-to-triphase economizer |
| CN103675539A (en) * | 2013-11-27 | 2014-03-26 | 广州智光电气股份有限公司 | Cascaded energy storage converter detecting platform and control method thereof |
| CN103675539B (en) * | 2013-11-27 | 2016-06-22 | 广州智光电气股份有限公司 | A kind of tandem type energy accumulation current converter detection platform and control method thereof |
| CN105790598A (en) * | 2016-04-20 | 2016-07-20 | 中国船舶重工集团公司第七〇二研究所 | Highly-reliable main circuit topological structure of railway ground deflector |
| CN106452101A (en) * | 2016-08-23 | 2017-02-22 | 重庆大学 | Electronic voltage regulator |
| CN106533198A (en) * | 2016-12-28 | 2017-03-22 | 苑雪飞 | High-frequency transformer-based railway purification power supply device |
| CN108923664A (en) * | 2018-05-29 | 2018-11-30 | 中国科学院电工研究所 | Three-phase input single-phase output frequency changer and control strategy |
| CN108923664B (en) * | 2018-05-29 | 2020-07-31 | 中国科学院电工研究所 | Three-phase input single-phase output frequency converter and control method |
| CN109039097A (en) * | 2018-09-14 | 2018-12-18 | 西门子电气传动有限公司 | Method for controlling frequency conversion, device, bank electricity system and storage medium |
| CN110224430A (en) * | 2019-06-11 | 2019-09-10 | 新风光电子科技股份有限公司 | A kind of DC3000V can present device and its control method |
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| CN101621255B (en) | 2012-05-23 |
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| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20100106 Assignee: Jiangsu Chesa Electric Co. Ltd. Assignor: Southeast University Contract record no.: 2012320001033 Denomination of invention: Cascade connection energy-regenerative type high-voltage converter Granted publication date: 20120523 License type: Exclusive License Record date: 20121220 |
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