CN102664535A - Four-quadrant high-voltage variable-frequency speed regulating system topology based on MMC (modular multilevel converter) transformer without phase shift - Google Patents
Four-quadrant high-voltage variable-frequency speed regulating system topology based on MMC (modular multilevel converter) transformer without phase shift Download PDFInfo
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Abstract
The invention relates to a four-quadrant high-voltage variable-frequency speed regulating system topology based on an MMC (modular multilevel converter) transformer without phase shift. The four-quadrant high-voltage variable-frequency speed regulating system topology comprises a grid-side converter, a common direct-current bus and a machine-side converter, the grid-side converter and the machine-side converter are connected by the common direct-current bus to form an AC-DC-AC topology, one end of the grid-side converter is connected with high alternating voltage and converts alternating voltage of the high alternating voltage into direct voltage, and the machine-side converter converts the direct voltage into alternating voltage with adjustable voltage amplitude and adjustable voltage frequency. The four-quadrant high-voltage variable-frequency speed regulating system topology has the advantages that an isolating phase-shift transformer at an input end of an alternating-current power grid is omitted, the size and the weight of a high-voltage variable-frequency speed regulating system are reduced by 55% respectively, material cost is reduced by 60%, manufacturing cycle is shortened by 50%, and occupied area is reduced by 30%; the topology is integrated and modularized, and engineering application is facilitated; and four-quadrant running of a high-voltage motor can be realized, and energy is fed back to the power grid.
Description
[technical field]
The present invention relates to a kind of high-voltage variable-frequency and variable-speed system topology; Be specifically related to a kind of four-quadrant high-voltage variable-frequency and variable-speed system topology of not having phase shifting transformer based on MMC; It can be applicable to the high-voltage motor frequency control of industries such as electric power, metallurgy, water treatment, traffic; Drag electric locomotive traction etc. like large fan, load of the pumps.
[background technology]
High-voltage variable-frequency and variable-speed system can be realized the high-voltage motor speed governing, is energy-saving and cost-reducing at present main means, is widely used in industries such as metallurgy, electric power.
In numerous high-voltage variable-frequency and variable-speed system topologys, H bridge cascaded high-voltage frequency conversion speed-adjusting system shown in Figure 1, owing to expand flexibly, little to the harmonic pollution of electrical network, output voltage dv/dt is little, becomes the main flow topology of present high-voltage variable-frequency and variable-speed system.
This topology adopts the cascade of low pressure H bridge, gives the technology of each unit power supply through isolating phase shifting transformer, and power cell structure is seen Fig. 2.This high-voltage variable-frequency and variable-speed system exists volume big, heaviness; Can't feedback energy etc. shortcoming.
In the The field of high-voltage variable-frequency and variable-speed system; Exist the motor regenerative braking situation, like occasions such as mine hoist, big inertia blower fan, locomotive tractions, when motor braking; Can therefore need high-voltage variable-frequency and variable-speed system to have energy feedback function with energy back to electrical network.
At present, adopt the four-quadrant high-voltage variable-frequency and variable-speed system topology of the no phase shifting transformer of MMC (Modular Multilevel Converter) modular multilevel transformer configuration also not appear in the newspapers.
Therefore, for avoiding above-mentioned technical problem, necessary a kind of novel structure is provided do not have the four-quadrant high-voltage variable-frequency and variable-speed system topology of phase shifting transformer based on MMC, to overcome said defective of the prior art.
[summary of the invention]
For addressing the above problem, the object of the present invention is to provide a kind of four-quadrant high-voltage variable-frequency and variable-speed system topology of not having phase shifting transformer based on MMC.
For realizing above-mentioned purpose, the technical scheme that the present invention takes is: a kind of four-quadrant high-voltage variable-frequency and variable-speed system topology of not having phase shifting transformer based on MMC is characterized in that: comprise grid side converter, common DC bus and pusher side converter; Wherein, said grid side converter and pusher side converter link to each other through common DC bus and constitute the AC-DC-AC topology; Said grid side converter one end connects High AC voltage, and alternating voltage is converted High AC voltage to direct voltage; Said pusher side converter converts direct voltage to the alternating voltage of voltage magnitude, frequency adjustable.
The four-quadrant high-voltage variable-frequency and variable-speed system topology of not having a phase shifting transformer based on MMC of the present invention further is set to: said grid side converter and pusher side converter using three-phase modular multilevel converter; Whenever, be in series by the 2n sub-module; Be divided into brachium pontis and following brachium pontis, the submodule number of each brachium pontis is n.
The four-quadrant high-voltage variable-frequency and variable-speed system topology of not having a phase shifting transformer based on MMC of the present invention further is set to: said grid side converter is by brachium pontis NA; Brachium pontis NB; Brachium pontis NC forms the three-phase modular multilevel converter; The last brachium pontis of NA is connected through two non-couplings or single tapped coupling buffer inductance La1, the La2 of being with following brachium pontis; The last brachium pontis of NB is connected through two non-couplings or single tapped coupling buffer inductance Lb1, the Lb2 of being with following brachium pontis, and the last brachium pontis of NC is connected through two non-couplings or single tapped coupling buffer inductance Lc1, the Lc2 of being with following brachium pontis; High-voltage alternating electrical network A phase, B phase, C insert middle, the Lc1 of middle, Lb1, the Lb2 of La1, La2, the middle of Lc2 mutually respectively.
The four-quadrant high-voltage variable-frequency and variable-speed system topology of not having a phase shifting transformer based on MMC of the present invention further is set to: said pusher side converter is by brachium pontis NU; Brachium pontis NV; Brachium pontis NW forms the three-phase modular multilevel converter; The last brachium pontis of NU is connected through two non-couplings or single tapped coupling buffer inductance Lu1, the Lu2 of being with following brachium pontis; The last brachium pontis of NV is connected through two non-couplings or single tapped coupling buffer inductance Lv1, the Lv2 of being with following brachium pontis, and the last brachium pontis of NW is connected through two non-couplings or single tapped coupling buffer inductance Lw1, the Lw2 of being with following brachium pontis; The middle of the middle of the middle of Lu1, Lu2, Lv1, Lv2, Lw1, Lw2 inserts U phase, V phase, the W phase of high-voltage motor respectively.
The four-quadrant high-voltage variable-frequency and variable-speed system topology of not having a phase shifting transformer based on MMC of the present invention also can be set to: the sub modular structure of said grid side converter and pusher side converter is a half-bridge structure; By after two full-controlled switch device IGBT series connection again shunt capacitance C form diode of the equal inverse parallel of each IGBT switching device.
Compared with prior art; The present invention has following beneficial effect: the four-quadrant high-voltage variable-frequency and variable-speed system topology of not having a phase shifting transformer based on MMC of the present invention has been saved the isolation phase shifting transformer of AC network input, and the volume of high-voltage variable-frequency and variable-speed system and weight have reduced 55%, material cost has reduced by 60%, the manufacturing cycle reduces 50%, floor space reduces 50%; This topology has realized integrated and modularization, makes things convenient for practical applications; Can realize the four quadrant running of high-voltage motor, energy is fed back to electrical network.
[description of drawings]
Fig. 1 is the schematic diagram of the H bridge cascaded high-voltage frequency conversion speed-adjusting system of prior art.
Fig. 2 is the power cell structure figure among Fig. 1.
Fig. 3 is the structured flowchart that does not have the four-quadrant high-voltage variable-frequency and variable-speed system topology of phase shifting transformer based on MMC of the present invention.
Fig. 4 is the schematic diagram that does not have the four-quadrant high-voltage variable-frequency and variable-speed system topology of phase shifting transformer based on MMC of the present invention.
Fig. 5 is the structure chart of the submodule of grid side converter and pusher side converter among Fig. 4.
Fig. 6-1 is to Fig. 6-the 4th, the working state figure of the submodule of Fig. 5.
[embodiment]
See also Figure of description 3 to shown in the Figure of description 6-4, the present invention does not have the four-quadrant high-voltage variable-frequency and variable-speed system topology of phase shifting transformer for a kind of based on MMC, and it is made up of several parts such as grid side converter 1, common DC bus 2 and pusher side converters 3.
Wherein, said grid side converter 1 links to each other through common DC bus 2 with pusher side converter 3, thereby constitutes back-to-back AC-DC-AC topology.Said grid side converter 1 adopts the modular multilevel converter topology with pusher side converter 3, and this topology need not to isolate phase shifting transformer, can High AC voltage be directly inputted to grid side converter 1.Said grid side converter 1 one ends connect High AC voltage, and convert alternating voltage to direct voltage, and pusher side converter 3 converts direct voltage the alternating voltage of voltage magnitude, frequency adjustable to, realizes the frequency control of high-voltage motor.Simultaneously, this modular multilevel converter topology is the four-quadrant type, can realize the energy feedback.
Said grid side converter 1 adopts identical three-phase modular multilevel converter with pusher side converter 3, is in series by a plurality of submodules; Whenever, be in series by the 2n sub-module, be divided into brachium pontis and following brachium pontis, the submodule number of each brachium pontis is n, n according to import, the output voltage grade decides.
Said grid side converter 1 is by brachium pontis NA; Brachium pontis NB; Brachium pontis NC forms the three-phase modular multilevel converter; The last brachium pontis of NA is connected through two non-couplings or single tapped coupling buffer inductance La1, the La2 of being with following brachium pontis, and the last brachium pontis of NB is connected through two non-couplings or single tapped coupling buffer inductance Lb1, the Lb2 of being with following brachium pontis, and the last brachium pontis of NC is connected through two non-couplings or single tapped coupling buffer inductance Lc1, the Lc2 of being with following brachium pontis; High-voltage alternating electrical network A phase, B phase, C insert middle, the Lc1 of middle, Lb1, the Lb2 of La1, La2, the middle of Lc2 mutually respectively.
Said pusher side converter 3 is by brachium pontis NU; Brachium pontis NV; Brachium pontis NW forms the three-phase modular multilevel converter; The last brachium pontis of NU is connected through two non-couplings or single tapped coupling buffer inductance Lu1, the Lu2 of being with following brachium pontis; The last brachium pontis of NV is connected through two non-couplings or single tapped coupling buffer inductance Lv1, the Lv2 of being with following brachium pontis, the U that the last brachium pontis of NW and following brachium pontis insert high-voltage motor respectively through two non-couplings or the single middle that connects middle, Lw1, the Lw2 of middle, Lv1, the Lv2 of Lu1, Lu2 with tapped coupling buffer inductance Lw1, Lw2 mutually, V phase, W phase.
Shown in accompanying drawing 5, the sub modular structure of said grid side converter 1, pusher side converter 3 is a half-bridge structure, and full-controlled switch device IGBT1 and IGBT2 are in series, parallel connection direct capacitor C again, and IGBT1 and IGBT2 be inverse parallel diode D1 and D2 respectively; The common port of the common port of IGBT1 and IGBT2, capacitor C and IGBT2 is respectively as output terminals A, the B of half-bridge.When IGBT1 (or D1) conducting, output voltage is the voltage of capacitor C; When IGBT2 (or D2) conducting, output voltage is 0.
The half-bridge structure that does not have the four-quadrant high-voltage variable-frequency and variable-speed system topology employing of phase shifting transformer based on MMC of the present invention through controlling conducting or the shutoff of IGBT1, IGBT2, according to the sense of current, can make circuit be in the different working state.
See Fig. 6-1, electric current flows to B through diode D1, capacitor C from A, and adopting the submodule output voltage of half-bridge structure is the voltage of capacitor C, and capacitor C is in charged state.
See Fig. 6-2, electric current flows to A through capacitor C, IGBT1 from B, and adopting the submodule output voltage of half-bridge structure is the voltage of capacitor C, and capacitor C is in discharge condition.
See Fig. 6-3, electric current flows to B through IGBT2 from A, and adopting the submodule output voltage of half-bridge structure is 0, and capacitor C is by bypass, and voltage does not change.
See Fig. 6-4, electric current flows to A through diode D2 from B, and adopting the submodule output voltage of half-bridge structure is 0, and capacitor C is by bypass, and voltage does not change.
The four-quadrant high-voltage variable-frequency and variable-speed system topology of not having a phase shifting transformer based on MMC of the present invention can realize the energy feedback; When motor is in regenerative braking; The energy back that motor sends is injected into high-voltage variable-frequency and variable-speed system, through pusher side converter 1, common DC bus 2, grid side converter 3 with energy back to exchanging electrical network.
Above embodiment is merely the preferred embodiment of this creation, not in order to limiting this creation, any modification of being made within all spirit and principles in this creation, is equal to replacement, improvement etc., all should be included within the protection range of this creation.
Claims (5)
1. a four-quadrant high-voltage variable-frequency and variable-speed system topology of not having phase shifting transformer based on MMC is characterized in that: comprise grid side converter, common DC bus and pusher side converter; Wherein, said grid side converter and pusher side converter link to each other through common DC bus and constitute the AC-DC-AC topology; Said grid side converter one end connects High AC voltage, and alternating voltage is converted High AC voltage to direct voltage; Said pusher side converter converts direct voltage to the alternating voltage of voltage magnitude, frequency adjustable.
2. the four-quadrant high-voltage variable-frequency and variable-speed system topology of not having phase shifting transformer based on MMC as claimed in claim 1; It is characterized in that: said grid side converter and pusher side converter using three-phase modular multilevel converter; Whenever, be in series by the 2n sub-module; Be divided into brachium pontis and following brachium pontis, the submodule number of each brachium pontis is n.
3. the four-quadrant high-voltage variable-frequency and variable-speed system topology of not having phase shifting transformer based on MMC as claimed in claim 2; It is characterized in that: said grid side converter is by brachium pontis NA; Brachium pontis NB; Brachium pontis NC forms the three-phase modular multilevel converter; The last brachium pontis of NA is connected through two non-couplings or single tapped coupling buffer inductance La1, the La2 of being with following brachium pontis, and the last brachium pontis of NB is connected through two non-couplings or single tapped coupling buffer inductance Lb1, the Lb2 of being with following brachium pontis, and the last brachium pontis of NC is connected through two non-couplings or single tapped coupling buffer inductance Lc1, the Lc2 of being with following brachium pontis; High-voltage alternating electrical network A phase, B phase, C insert middle, the Lc1 of middle, Lb1, the Lb2 of La1, La2, the middle of Lc2 mutually respectively.
4. the four-quadrant high-voltage variable-frequency and variable-speed system topology of not having phase shifting transformer based on MMC as claimed in claim 3; It is characterized in that: said pusher side converter is by brachium pontis NU; Brachium pontis NV; Brachium pontis NW forms the three-phase modular multilevel converter; The last brachium pontis of NU is connected through two non-couplings or single tapped coupling buffer inductance Lu1, the Lu2 of being with following brachium pontis, and the last brachium pontis of NV is connected through two non-couplings or single tapped coupling buffer inductance Lv1, the Lv2 of being with following brachium pontis, and the last brachium pontis of NW is connected through two non-couplings or single tapped coupling buffer inductance Lw1, the Lw2 of being with following brachium pontis; The middle of the middle of the middle of Lu1, Lu2, Lv1, Lv2, Lw1, Lw2 inserts U phase, V phase, the W phase of high-voltage motor respectively.
5. the four-quadrant high-voltage variable-frequency and variable-speed system topology of not having phase shifting transformer based on MMC as claimed in claim 4; It is characterized in that: the sub modular structure of said grid side converter and pusher side converter is a half-bridge structure; By after two full-controlled switch device IGBT series connection again shunt capacitance C form diode of the equal inverse parallel of each IGBT switching device.
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Cited By (9)
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| CN103762870A (en) * | 2014-01-28 | 2014-04-30 | 华南理工大学 | Double-input single-phase six-switch-block MMC rectifier and control method thereof |
| CN103762861A (en) * | 2014-01-28 | 2014-04-30 | 华南理工大学 | N input single-phase 2N+2 switching group MMC rectifier and control method thereof |
| CN103904909A (en) * | 2014-04-01 | 2014-07-02 | 河南理工大学 | Double-PWM frequency converter integrated coordinated control system based on fractional order control |
| CN104601003A (en) * | 2015-01-06 | 2015-05-06 | 东南大学 | Power electronic transformer based on modular multilevel converter |
| CN104638940A (en) * | 2015-03-02 | 2015-05-20 | 东南大学 | Modular multi-level power electronic transformer based on cascading |
| CN104811057A (en) * | 2015-04-23 | 2015-07-29 | 广东明阳龙源电力电子有限公司 | Four-quadrant high voltage inverter device based on MMC structure |
| US9608544B2 (en) | 2012-09-14 | 2017-03-28 | Robert Bosch Gmbh | Energy supply system comprising an energy storage device and method for actuating coupling devices of the energy storage device |
| CN108400715A (en) * | 2018-02-07 | 2018-08-14 | 西南交通大学 | Rail traction power supply using modular multi-level converter and train transmission system |
| CN109474187A (en) * | 2019-01-17 | 2019-03-15 | 哈尔滨工业大学 | A kind of modular multilevel four-quadrant frequency converter and its control method |
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2012
- 2012-04-10 CN CN2012101027962A patent/CN102664535A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9608544B2 (en) | 2012-09-14 | 2017-03-28 | Robert Bosch Gmbh | Energy supply system comprising an energy storage device and method for actuating coupling devices of the energy storage device |
| CN104620492B (en) * | 2012-09-14 | 2017-10-27 | 罗伯特·博世有限公司 | Method and energy supply system for the coupling device that controls energy storing device |
| CN103762870A (en) * | 2014-01-28 | 2014-04-30 | 华南理工大学 | Double-input single-phase six-switch-block MMC rectifier and control method thereof |
| CN103762861A (en) * | 2014-01-28 | 2014-04-30 | 华南理工大学 | N input single-phase 2N+2 switching group MMC rectifier and control method thereof |
| CN103762870B (en) * | 2014-01-28 | 2017-01-11 | 华南理工大学 | Double-input single-phase six-switch-block MMC rectifier and control method thereof |
| CN103904909A (en) * | 2014-04-01 | 2014-07-02 | 河南理工大学 | Double-PWM frequency converter integrated coordinated control system based on fractional order control |
| CN104601003A (en) * | 2015-01-06 | 2015-05-06 | 东南大学 | Power electronic transformer based on modular multilevel converter |
| CN104638940A (en) * | 2015-03-02 | 2015-05-20 | 东南大学 | Modular multi-level power electronic transformer based on cascading |
| CN104811057A (en) * | 2015-04-23 | 2015-07-29 | 广东明阳龙源电力电子有限公司 | Four-quadrant high voltage inverter device based on MMC structure |
| CN108400715A (en) * | 2018-02-07 | 2018-08-14 | 西南交通大学 | Rail traction power supply using modular multi-level converter and train transmission system |
| CN109474187A (en) * | 2019-01-17 | 2019-03-15 | 哈尔滨工业大学 | A kind of modular multilevel four-quadrant frequency converter and its control method |
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Application publication date: 20120912 |