CN103138675A - High-voltage inverter sharing direct current (DC) bus - Google Patents
High-voltage inverter sharing direct current (DC) bus Download PDFInfo
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- CN103138675A CN103138675A CN2012105907904A CN201210590790A CN103138675A CN 103138675 A CN103138675 A CN 103138675A CN 2012105907904 A CN2012105907904 A CN 2012105907904A CN 201210590790 A CN201210590790 A CN 201210590790A CN 103138675 A CN103138675 A CN 103138675A
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Abstract
The invention relates to a high-voltage inverter sharing a direct current (DC) bus. The high-voltage inverter sharing the DC bus comprises a charging circuit, a phase-shifting transformer, three-phase diode rectifier bridges, a high voltage DC bus and an inverter based on multi-media card (MMC) topology. The primary side of the phase-shifting transformer is connected with a power grid through the charging circuit, each subsidiary side output winding of the phase-shifting transformer is connected with the three-phase diode rectifier bridge, the output capacitors of each diode rectifier are connected in series to form the high voltage DC bus, the high voltage DC bus is connected with the public DC end of one inverter or multiple inverters based on MMC topology, and the output ends of the inverters are connected the electric motor to be detected, and the mixed frequency test and the frequency control function of the electric motor is achieved. The topologic scheme of the high-voltage inverter sharing the DC bus meets the requirements of the electric motor test station of a weak grid end, multiple-unit output of the phase-shifting transformer with multiple windings is used, the DC bus formed by the series connection of the diode rectifying capacitors is used to store the energy extracted and fed back when the electric motor mixed frequency test is carried out, the energy is no longer loaded by the power grid, and therefore the pollution to the power grid caused by the electric motor test is eliminated.
Description
Technical field
The present invention relates to a kind of common DC bus high voltage converter, particularly the high voltage converter of electric machine temperature rise experiment and electric machine speed regulation purposes.
Background technology
Nowadays the increasing high voltage converter that adopts of the temperature rise of asynchronous machine experiment is folded experiment frequently.By Principle of Electric Engine as can be known, when folded frequency is tested, frequency converter sends voltage U 1 and the secondary voltage U 2 of F2 frequently of dominant frequency F1 simultaneously, and this moment, tested motor periodic duty was at electronic and generating state.Conventional four-quadrant high voltage converter is come the direct voltage of balance unit by the full-controlled rectifier bridge when fold frequency and testing, tested machine operation when motoring condition frequency converter from the electrical network extracting energy, otherwise frequency converter is to the electrical network feedback energy.
Weak end (10kV electrical network at industrial electrical network, the 7MW net capacity) motor experiment station need carry out powerful motor and fold when frequently testing, due to energy excessive the destroyed Network Voltage Stability of four-quadrant high voltage converter to grid side extraction or feedback, cause other power consumption equipments to work.
MMC (Modular Multilevel Converter) is a kind of modular multilevel converter, has public dc terminal, satisfies the demand of this programme.
Summary of the invention
The topological project that this patent proposes has well satisfied the requirement of light current net end motor experiment station.Utilize many windings phase shifting transformer to organize output, the common DC bus that the diode rectification capacitances in series forms stores and extracts when motor is folded tests frequently and the energy of feedback more, thereby this part energy is no longer born the elimination motor test to the pollution of electrical network by electrical network.Inverter based on the MMC topology has public dc terminal, and this programme adopts the MMC topological project in the inversion side.Can connect many group inverters on common DC bus tests multiple electric motors simultaneously.
The purpose of this programme is to provide a kind of high voltage converter, can carry out at the weak end of electrical network the folded experiment frequently of powerful motor, electrical network is not polluted.This scheme provides a kind of voltage-source type high pressure-high voltage converter with common DC bus, and the side that is incorporated into the power networks adopts does not control rectification, and single-phase mobile assurance of power grid energy can not pollute by electrical network when motor test; Inverter on high voltage dc bus can connect one or more inverter, depending on the demand flexible configuration of motor experiment station.Satisfied when motor is done folded frequently the experiment and electrical network has not been impacted; A rectification unit can be with many inverters to carry out motor test, has realized compact and the flexibility of variable frequency power supply.Satisfy the harsh requirement that light current net end carries out motor test, the support equipment security of operation.
For achieving the above object, the present invention is achieved through the following technical solutions:
a kind of high voltage converter of common DC bus, it is characterized in that, comprise charging circuit, phase shifting transformer, the three-phase diode rectifier bridge, high voltage dc bus, based on the MMC topology inverter, the former limit of phase shifting transformer is connected with electrical network by charging circuit, each secondary output winding of phase shifting transformer is connected with the three-phase diode rectifier bridge, the output capacitance of each diode rectifier bridge formation high voltage dc bus that is together in series, high voltage dc bus is connected in the inverter public direct-current end of MMC topology with 1 or many stylobates, the tested motor of output termination of inverter, realize folded frequency experiment and the frequency control function of motor, the course of work of described high voltage converter is: close circuit breaker K1 when device starts, and cut-off breaker KM charges to rectification circuit by charging resistor, the pulse of inversion side seal lock, after direct voltage is set up again close circuit breaker KM with the charging resistor bypass, half when inverter circuit unit module voltage at this moment only has normal operation, inverter circuit starts charging control logic, and when module voltage is lifted to normal working voltage, charging process finishes.
Described phase shifting transformer output can form the 2kV direct voltage on output capacitance after the three-phase diode rectifier bridge, form the 24kV dc bus through 12 output capacitance series connection.
Described inverter adopts the MMC topological structure, and this topology is comprised of the modular multilevel cascade, every up and down half-bridge that is divided into mutually, and each half-bridge has n module and an inductance, and the intermediate point of the inductance of up and down half-bridge is as the output of inverter; Utilize the mode of modular multilevel cascade to form the high voltage direct current common port, make the balance of voltage of modules by Pressure and Control, divide equally the voltage of direct current common port.
Described based on the MMC topology inverter, routine folded frequently control or modulating wave that variable frequency regulating speed control generates after, additional ring current control and module voltage balance are controlled function.
Compared with prior art, the invention has the beneficial effects as follows:
1) the invention provides a kind of solution of frequently testing of with high voltage converter, high power induction motor being folded under light current net condition, satisfy the specific (special) requirements at light current motor experiment station off the net.
2) utilize a plurality of secondary windings of phase shifting transformer, the series connection by the rectification output capacitance to be setting up high voltage dc bus, utilizes cascaded structure to set up the dc bus of 24kV under the limited condition of diode voltage withstand class.
3) inverter adopts the topological structure of modular multilevel, make inverter have public dc bus, and then realized that many inverters can be connected in parallel on dc bus, having broken traditional frequency conversion device rectifier and inverter is man-to-man structure, realize the intensive and compact of structure, improved power density.Can only have a rectification unit in the occasion of many high voltage converters of needs, reduce the holistic cost of equipment.
4) native system comprises output voltage control and the control of MMC balance to the control of inverter, and output voltage control can be realized folded frequency experiment and the electric machine speed regulation control of bifrequency output; The MMC balance is controlled to be added on basic modulating wave and is controlled with balance and the brachium pontis circulation of realizing each cell voltage, the continuous reliability service of safeguards system.
Description of drawings
Fig. 1 is common DC bus high voltage converter system configuration;
Fig. 2 inverter control block diagram.
Embodiment
See Fig. 1, a kind of high voltage converter is comprised of charhing unit, rectification side and inversion side.The 10kV electrical network is connected to phase shifting transformer former limit through circuit breaker KM and charging resistor, 12 groups of secondary outputs of phase shifting transformer connect the three-phase diode rectifier bridge, the output of every group of rectifier bridge connects storage capacitor, all storage capacitor C1, C2, the Cn formation high voltage dc bus that is together in series; Adopt the public direct-current of MMC topological structure inverter to terminate on high voltage dc bus, through being connected with tested motor after the common outputting inductance that forms of upper and lower bridge arm, can export the folded frequency voltage signal of 50Hz and 40Hz, also exportable frequency conversion voltage signal carries out speed regulating control to motor.
See Fig. 1, close circuit breaker K1 when device starts, cut-off breaker KM charges to rectification circuit by charging resistor, the pulse of inversion side seal lock.After direct voltage is set up again close circuit breaker KM with the charging resistor bypass, half when inverter circuit unit module voltage at this moment only has normal operation, inverter circuit starts charging control logic, and when module voltage is lifted to normal working voltage, charging process finishes.
Described phase shifting transformer has 12 groups of secondary outputs, and every group of secondary phase shift angle is 5 degree, and the harmonic pollution to electrical network after transformer primary side forms 72 pulse waves not control rectification is very little.
Described three-phase diode rectifier bridge is at output side joint big capacity electrolyte capacitor, to realize handling up at motor is folded when frequently testing energy.Electrical network is not flow through in flowing of this energy, in order to avoid affect the stability of electrical network.Realized utilizing high voltage converter to fold experiment frequently to motor under light current net condition.
Described common DC bus can connect many group inverters.When connecting more than 1 group inverter, not only can improve compact, the workout cost of equipment, more have and utilize the fluctuation that reduces bus.By the folded principle frequently of motor as can be known, the active power of electrical consumption presents low frequency oscillation when frequently testing fold, and the energy of handling up when two folded frequencies of motor the are tested half period that staggers can realize the complementation of energy reducing the fluctuation of DC bus-bar voltage.
See Fig. 2, the control block diagram of inverter includes basic modulating wave generation, circulation control, module voltage balance control three parts.Form the driving pulse that provides each unit module after final modulating wave is modulated through phase-shifting carrier wave PWM.This scheme has realized the balance of module voltage and has all pressed, and makes the brachium pontis electric current controlled, and phase-shifting carrier wave PWM modulates and realizes that conveniently feasibility is high, the equipment that ensured operation steady in a long-term.
Claims (4)
1. the high voltage converter of a common DC bus, it is characterized in that, comprise charging circuit, phase shifting transformer, the three-phase diode rectifier bridge, high voltage dc bus, based on the MMC topology inverter, the former limit of phase shifting transformer is connected with electrical network by charging circuit, each secondary output winding of phase shifting transformer is connected with the three-phase diode rectifier bridge, the output capacitance of each diode rectifier bridge formation high voltage dc bus that is together in series, high voltage dc bus is connected in the inverter public direct-current end of MMC topology with 1 or many stylobates, the tested motor of output termination of inverter, realize folded frequency experiment and the frequency control function of motor, the course of work of described high voltage converter is: close circuit breaker K1 when device starts, and cut-off breaker KM charges to rectification circuit by charging resistor, the pulse of inversion side seal lock, after direct voltage is set up again close circuit breaker KM with the charging resistor bypass, half when inverter circuit unit module voltage at this moment only has normal operation, inverter circuit starts charging control logic, and when module voltage is lifted to normal working voltage, charging process finishes.
2. the high voltage converter of a kind of common DC bus according to claim 1, it is characterized in that, described phase shifting transformer output can form the 2kV direct voltage on output capacitance after the three-phase diode rectifier bridge, form the 24kV dc bus through 12 output capacitance series connection.
3. the high voltage converter of a kind of common DC bus according to claim 1, it is characterized in that, described inverter adopts the MMC topological structure, this topology is comprised of the modular multilevel cascade, every up and down half-bridge that is divided into mutually, each half-bridge has n module and an inductance, and the intermediate point of the inductance of up and down half-bridge is as the output of inverter; Utilize the mode of modular multilevel cascade to form the high voltage direct current common port, make the balance of voltage of modules by Pressure and Control, divide equally the voltage of direct current common port.
4. the high voltage converter of a kind of common DC bus according to claim 3, it is characterized in that, described based on the MMC topology inverter, routine folded frequently control or modulating wave that variable frequency regulating speed control generates after, additional ring current control and module voltage balance are controlled function.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427653A (en) * | 2013-08-01 | 2013-12-04 | 南京南瑞继保电气有限公司 | High-voltage DC-DC conversion device |
| CN103595143A (en) * | 2013-11-23 | 2014-02-19 | 大连尚能科技发展有限公司 | Feedback type energy storage servo driving system |
| CN104201909A (en) * | 2014-09-12 | 2014-12-10 | 东南大学 | Three-phase modularized multi-level converter for VSC-HVDC (voltage source converter-high voltage DC) and carrier phase-shifting modulation method of converter |
| CN105024585A (en) * | 2015-08-05 | 2015-11-04 | 南京国电环保科技有限公司 | Serial-type pulse voltage generating device and method |
| CN107276381A (en) * | 2017-08-15 | 2017-10-20 | 中冶华天南京电气工程技术有限公司 | High voltage converter pre-charging device and charging method based on electric power electric transformer |
| CN108667025A (en) * | 2018-06-22 | 2018-10-16 | 国网湖北省电力有限公司电力科学研究院 | A kind of medium voltage side power quality multiple target comprehensive processing method and system |
| CN108880402A (en) * | 2018-06-22 | 2018-11-23 | 卧龙电气集团辽宁荣信高科电气有限公司 | A kind of high-power nine phases motor phase failure combination method |
| CN109787534A (en) * | 2019-02-28 | 2019-05-21 | 北京百度网讯科技有限公司 | A kind of frequency converter and frequency-converting control device powered using high voltage direct current |
| CN110829870A (en) * | 2019-10-28 | 2020-02-21 | 杭州电子科技大学 | Control method of modular multilevel converter in low-frequency operation state |
| CN111092551A (en) * | 2019-12-30 | 2020-05-01 | 杭州意能电力技术有限公司 | Module cascade high-voltage direct-current chopper |
| CN111464109A (en) * | 2020-03-26 | 2020-07-28 | 新风光电子科技股份有限公司 | Electrical topological structure of 10kV high-voltage variable frequency motor integrated machine |
| CN111682783A (en) * | 2020-06-01 | 2020-09-18 | 新风光电子科技股份有限公司 | High-voltage frequency conversion all-in-one machine adopting trapezoidal modulation waves and control method thereof |
| CN112234777A (en) * | 2020-09-22 | 2021-01-15 | 青岛中加特电气股份有限公司 | High-voltage permanent magnet frequency conversion all-in-one machine |
| CN112615388A (en) * | 2020-12-15 | 2021-04-06 | 国网湖北省电力有限公司电力科学研究院 | Medium-high voltage power supply quality unified regulator containing distributed energy storage units |
| CN112615551A (en) * | 2020-12-09 | 2021-04-06 | 国网湖北省电力有限公司电力科学研究院 | MMC type medium voltage power supply quality comprehensive improving system |
| CN113595075A (en) * | 2021-08-04 | 2021-11-02 | 全球能源互联网研究院有限公司 | Starting method and device of low-frequency power transmission system |
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Cited By (21)
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|---|---|---|---|---|
| CN103427653A (en) * | 2013-08-01 | 2013-12-04 | 南京南瑞继保电气有限公司 | High-voltage DC-DC conversion device |
| CN103595143A (en) * | 2013-11-23 | 2014-02-19 | 大连尚能科技发展有限公司 | Feedback type energy storage servo driving system |
| CN103595143B (en) * | 2013-11-23 | 2016-01-20 | 大连尚能科技发展有限公司 | Feed-back type energy storage servo drive system |
| CN104201909A (en) * | 2014-09-12 | 2014-12-10 | 东南大学 | Three-phase modularized multi-level converter for VSC-HVDC (voltage source converter-high voltage DC) and carrier phase-shifting modulation method of converter |
| CN105024585A (en) * | 2015-08-05 | 2015-11-04 | 南京国电环保科技有限公司 | Serial-type pulse voltage generating device and method |
| CN105024585B (en) * | 2015-08-05 | 2017-11-14 | 南京国电环保科技有限公司 | Tandem pulse voltage generating means and method |
| CN107276381A (en) * | 2017-08-15 | 2017-10-20 | 中冶华天南京电气工程技术有限公司 | High voltage converter pre-charging device and charging method based on electric power electric transformer |
| CN108880402B (en) * | 2018-06-22 | 2021-11-19 | 卧龙电气集团辽宁荣信电气传动有限公司 | Phase-missing grid-connection method for high-power nine-phase motor |
| CN108667025A (en) * | 2018-06-22 | 2018-10-16 | 国网湖北省电力有限公司电力科学研究院 | A kind of medium voltage side power quality multiple target comprehensive processing method and system |
| CN108880402A (en) * | 2018-06-22 | 2018-11-23 | 卧龙电气集团辽宁荣信高科电气有限公司 | A kind of high-power nine phases motor phase failure combination method |
| CN109787534A (en) * | 2019-02-28 | 2019-05-21 | 北京百度网讯科技有限公司 | A kind of frequency converter and frequency-converting control device powered using high voltage direct current |
| CN110829870A (en) * | 2019-10-28 | 2020-02-21 | 杭州电子科技大学 | Control method of modular multilevel converter in low-frequency operation state |
| CN111092551A (en) * | 2019-12-30 | 2020-05-01 | 杭州意能电力技术有限公司 | Module cascade high-voltage direct-current chopper |
| CN111464109A (en) * | 2020-03-26 | 2020-07-28 | 新风光电子科技股份有限公司 | Electrical topological structure of 10kV high-voltage variable frequency motor integrated machine |
| CN111682783A (en) * | 2020-06-01 | 2020-09-18 | 新风光电子科技股份有限公司 | High-voltage frequency conversion all-in-one machine adopting trapezoidal modulation waves and control method thereof |
| CN112234777A (en) * | 2020-09-22 | 2021-01-15 | 青岛中加特电气股份有限公司 | High-voltage permanent magnet frequency conversion all-in-one machine |
| WO2022062103A1 (en) * | 2020-09-22 | 2022-03-31 | 青岛中加特电气股份有限公司 | High-voltage permanent magnet frequency conversion all-in-one machine |
| CN112234777B (en) * | 2020-09-22 | 2022-04-08 | 青岛中加特电气股份有限公司 | High-voltage permanent magnet frequency conversion all-in-one machine |
| CN112615551A (en) * | 2020-12-09 | 2021-04-06 | 国网湖北省电力有限公司电力科学研究院 | MMC type medium voltage power supply quality comprehensive improving system |
| CN112615388A (en) * | 2020-12-15 | 2021-04-06 | 国网湖北省电力有限公司电力科学研究院 | Medium-high voltage power supply quality unified regulator containing distributed energy storage units |
| CN113595075A (en) * | 2021-08-04 | 2021-11-02 | 全球能源互联网研究院有限公司 | Starting method and device of low-frequency power transmission system |
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Application publication date: 20130605 |