CN104811057A - Four-quadrant high voltage inverter device based on MMC structure - Google Patents
Four-quadrant high voltage inverter device based on MMC structure Download PDFInfo
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- CN104811057A CN104811057A CN201510198465.7A CN201510198465A CN104811057A CN 104811057 A CN104811057 A CN 104811057A CN 201510198465 A CN201510198465 A CN 201510198465A CN 104811057 A CN104811057 A CN 104811057A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a four-quadrant high voltage inverter device based on a modular multilevel converter (MMC) structure. Compared with a traditional high voltage frequency converter based on a phase shifting transformer and a four-quadrant full-bridge unit series connection structure, the device absorbs active power from a power grid when a motor is driven and feeds back active power to the power grid when the motor is braked. The device achieve two-way flowing of the active power on the power grid side and the motor side, meanwhile the phase shifting transformer is saved, the modularized structure ensures that the device can flexibly expand voltage class and capacity, and use range and product competitiveness of the inverter are greatly improved.
Description
Technical field
The present invention relates to high voltage converter, especially based on the four-quadrant high-voltage inverter device of MMC structure.
Background technology
Require energy feedback to give power supply at elevator or milling train class frequency converter, realize regenerative braking, traditional high voltage converter is that it adopts low voltage unit to connect based on phase shifting transformer+four-quadrant full bridge unit cascaded structure, powered to unit by isolation phase shifting transformer, as shown in Figure 1.Its power cell is as Fig. 2, and rectification side adopts PWM mode rectification, and inverter side adopts triangular wave phase-shift PWM mode, and each power cell transformer side needs three-phase LC passive filtration unit.This high voltage converter exists that dynamic response is slow, energy consumption is high, efficiency is low, volume is large, high in cost of production shortcoming.
Summary of the invention
For solving the problems of the technologies described above, the object of this invention is to provide a kind of four-quadrant high-voltage inverter device based on MMC structure.
The technical solution used in the present invention is:
Based on the four-quadrant high-voltage inverter device of MMC structure, comprise the rectification module and inversion module that connect in turn, this rectification module input is for connecting high-voltage fence, the output of inversion module is for connecting electric machinery load, it is characterized in that: described rectification module and the DC output end of rectification module identical with the cellular construction of inversion module is connected with the direct-flow input end of inversion module, rectification module and inversion module are divided into three-phase, are often made up of multiple chain type MMC units in series.
Describedly often be in series by even number N number of chain type MMC subelement and be divided into upper and lower two groups, often organizing subelement number is N/2; The output of every phase is the midpoint of upper and lower two groups of subelements, and is connected with buffer inductance between output with upper and lower two groups of subelements.
The structure of described chain type MMC subelement is half-bridge structure, comprise two IGBT switching element T 1, a T2 and DC capacitor C, the emitter of this switching element T 1 is connected with the collector electrode of switching element T 2, is connected in series described DC capacitor C between the emitter of this switching element T 2 and the collector electrode of switching element T 1.
The described four-quadrant high-voltage inverter device based on MMC structure also comprises the resistance charge circuit be serially connected between rectification module input and high-voltage fence, and this resistance charge circuit comprises charging resistor in parallel and by-pass switch.
Beneficial effect of the present invention:
The present invention is with traditional based on compared with phase shifting transformer+four-quadrant full bridge unit cascaded structure high voltage converter, and when drive motors time, device absorbs meritorious from electrical network; When motor braking time, device is meritorious to electrical network feedback.Device realizes active power in grid side and motor side two-way flow, and save phase shifting transformer again, modular construction assurance device expands electric pressure and capacity neatly, substantially increases the frequency converter scope of application and product competitiveness simultaneously.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
Fig. 1 is the four-quadrant high voltage frequency changer structure figure of band transformer;
Fig. 2 is the four-quadrant high voltage transducer power unit of band transformer;
Fig. 3 is the access way schematic diagram of MMC four-quadrant high voltage converter of the present invention;
Fig. 4 is MMC four-quadrant high voltage converter rectification of the present invention and inversion module structure chart;
Fig. 5 is the schematic diagram of MMC unit;
Fig. 6 is based on the voltage with multiple levels waveform generating principle figure of MMC technology.
Embodiment
A kind of high pressure four-quadrant frequency converter topological structure based on MMC structure.MMC is the abbreviation of Modular Multilevel Converter--modular multi-level converter.This topological structure adopts modularization chain type series system, and as shown in Figure 3, rectification side valve group (rectification module) is connected with high-voltage fence by resistance charge circuit, and inversion side valve group (inversion module) is directly connected with alternating current machine.Its advantage is that each power model does not need alternating voltage and current sensor, do not need filter capacitor and inductance, eliminate isolation phase shifting transformer, reduce cost, reduce volume and the cost of frequency-converter device, reduce loss, simultaneously simple, the dismounting of cellular construction easily, easy-to-connect.For achieving the above object, the present invention is achieved through the following technical solutions:
Based on MMC four-quadrant high voltage converter topological structure as shown in Figure 4, rectification side is identical with inverter side valve block structure.Rectification and inversion module all adopt the multiple-level serially connected structure of chained block, are in series by multiple subelement, and this topological rectification input side is connected with electrical network by charging resistor, grid-connected complete after by resistance bypass; High Level AC Voltage is changed into direct current by rectification side; Inverter side is directly connected with alternating current machine, and converting direct-current power into alternating-current power is driven alternating current machine; This topological structure can realize four-quadrant energy feedback.
Described rectification, inversion module are divided into three-phase, are often in series by even number N number of MMC subelement and are divided into upper and lower two groups, and often organizing subelement number is N/2; The output of every phase is the midpoint of two groups of subelements, and is connected with buffer inductance between output with subelement;
The structure of chain type MMC subelement is half-bridge structure as shown in Figure 5, comprise two IGBT switching element T 1, a T2 and DC capacitor C, the emitter of this switching element T 1 is connected with the collector electrode of switching element T 2, is connected in series described DC capacitor C between the emitter of this switching element T 2 and the collector electrode of switching element T 1.
Based on the wind electric converter topological structure of MMC.This structure is made up of multiple chain type MMC units in series, and each unit adopts half-bridge structure.As shown in Figure 5, two switching element T 1, T2 connect, more in parallel with DC capacitor C.And switching element T 1, T2 be anti-paralleled diode respectively; The common port of T1 and T2, the common port of electric capacity C and T2, as the output of each unit, is connected with other unit.The necessary complementary conducting of T1 and T2, when T1 conducting T2 ends, unit exports high level; When T2 conducting T1 ends, unit exports 0 level; When T1, T2 end, unit is in blocking, generally uses with when starting in fault.Its logical relation is as following table:
Operational mode | T1 | T2 | iSM | USM | State |
1 | 1 | 0 | >0 | UC | Drop into |
2 | 1 | 0 | <0 | UC | Drop into |
3 | 0 | 1 | >0 | 0 | Excision |
4 | 0 | 1 | <0 | 0 | Excision |
5 | 0 | 0 | >0 | UC | Locking |
6 | 0 | 0 | <0 | 0 | Locking |
During normal operation, first access electric power system, electric power system gives the charging of each power model by charging resistor.If do not have charging resistor, device directly accesses electric power system, can produce excessive charging current and cause power model to damage.After power model direct voltage reaches certain numerical value (this numerical value can set), by-pass switch closes, and charging resistor is equivalent to short circuit, and device reaches the state of being incorporated into the power networks.In the state of being incorporated into the power networks, each submodule is operated in full voltage or zero-voltage state.For sake of convenience, it is open-minded that definition submodule is in full voltage state, and zero-voltage state is for turning off.So the single facies unit of frequency converter can be equivalent to the structure of Fig. 6 (a).In order to the waveform generating principle of analysis module multi-level frequency conversion device technology, might as well be described for a phase.A in (), uao represents the phase voltage that frequency converter a facies unit exports, ua1, ua2 represent the upper and lower bridge arm voltage of a facies unit respectively, and Udc is direct voltage.Because capacitor dispersion is arranged in each submodule by MMC structure frequency converter, constant in order to maintain direct voltage, the conduction module number that upper and lower two brachium pontis of each facies unit are total is constant.Fig. 6 (b) clearly presents the composition principle of frequency converter phase voltage waveform, can find out that the number of modules of each facies unit upper and lower brachium pontis conducting presents shifting variation tendency from figure visually.In frequency converter, three facies units have strict symmetry, every phase brachium pontis controls brachium pontis output voltage by the switching of submodule, therefore every phase brachium pontis all can be equivalent to a controllable voltage source, as Fig. 6 (c), the waveform of bridge arm voltage ua1 and ua2 is symmetrical about Udc/2, and this shows that any time sum of the two perseverance is Udc.
Ignore the pressure drop of frequency converter bridge arm reactor, can obtain:
(1)
Two formulas in formula (1) are added, obtain:
(2)
Can be drawn by above-mentioned two formulas, the submodule number being in input state when modular multilevel frequency converter normally runs in every facies unit is all equal at any time and constant, realizes frequency converter AC export many level waveforms by carrying out distribution to the submodule number being in input state in every mutually upper and lower brachium pontis.
Because in modular multilevel frequency converter, three facies units have strict symmetry, upper and lower brachium pontis in facies unit also has strict symmetry, therefore direct current Idc divides equally between three facies units, and the output end current of a phase is divided into two parts at upper and lower brachium pontis.Therefore, can obtain the upper and lower bridge arm current of a phase is:
(3)
According to above-mentioned principle, the ua1=0 when N number of submodules all in brachium pontis in a phase all excise, N number of submodule that at this moment the lower brachium pontis of a phase is all will drop into, and just can obtain direct voltage Udc.Again because the submodule number being in input state in facies unit is a constant amount, so generally, the submodule number being in input state in each facies unit is N number of, is the half (not considering redundancy) of whole submodule number 2N in this facies unit.Like this, the submodule number that single brachium pontis is in input state can be 0,1,2 ..., N, the level number that is the most multipotency of modular multilevel frequency converter exports is N+1.
The foregoing is only preferred embodiments of the present invention, the present invention is not limited to above-mentioned execution mode, as long as the technical scheme realizing the object of the invention with basic same approach all belongs within protection scope of the present invention.
Claims (4)
1. based on the four-quadrant high-voltage inverter device of MMC structure, comprise the rectification module and inversion module that connect in turn, this rectification module input is for connecting high-voltage fence, the output of inversion module is for connecting electric machinery load, it is characterized in that: described rectification module and the DC output end of rectification module identical with the cellular construction of inversion module is connected with the direct-flow input end of inversion module, rectification module and inversion module are divided into three-phase, are often made up of multiple chain type MMC units in series.
2. the four-quadrant high-voltage inverter device based on MMC structure according to claim 1, is characterized in that: be describedly often in series by even number N number of chain type MMC subelement and be divided into upper and lower two groups, and often organizing subelement number is N/2; The output of every phase is the midpoint of upper and lower two groups of subelements, and is connected with buffer inductance between output with upper and lower two groups of subelements.
3. the four-quadrant high-voltage inverter device based on MMC structure according to claim 2, it is characterized in that: the structure of described chain type MMC subelement is half-bridge structure, comprise two IGBT switching element T 1, a T2 and DC capacitor C, the emitter of this switching element T 1 is connected with the collector electrode of switching element T 2, is connected in series described DC capacitor C between the emitter of this switching element T 2 and the collector electrode of switching element T 1.
4. the four-quadrant high-voltage inverter device based on MMC structure according to claim 1, it is characterized in that: it also comprises the resistance charge circuit be serially connected between rectification module input and high-voltage fence, this resistance charge circuit comprises charging resistor in parallel and by-pass switch.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108539779A (en) * | 2018-02-09 | 2018-09-14 | 南瑞集团有限公司 | Total power variable-ratio pumped storage based on MMC |
CN113606119A (en) * | 2021-08-27 | 2021-11-05 | 西安热工研究院有限公司 | Variable-speed constant-frequency compressed air energy storage power generation system |
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CN102013813A (en) * | 2010-07-22 | 2011-04-13 | 荣信电力电子股份有限公司 | Four-quadrant high pressure frequency converter topology structure without transformer |
CN102055347A (en) * | 2010-07-22 | 2011-05-11 | 荣信电力电子股份有限公司 | Modular multilevel converter (MMC)-based transformer-free four-quadrant high-voltage variable frequency power supply topological structure |
CN102664535A (en) * | 2012-04-10 | 2012-09-12 | 江苏力普电子科技有限公司 | Four-quadrant high-voltage variable-frequency speed regulating system topology based on MMC (modular multilevel converter) transformer without phase shift |
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 |
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2015
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102013813A (en) * | 2010-07-22 | 2011-04-13 | 荣信电力电子股份有限公司 | Four-quadrant high pressure frequency converter topology structure without transformer |
CN102055347A (en) * | 2010-07-22 | 2011-05-11 | 荣信电力电子股份有限公司 | Modular multilevel converter (MMC)-based transformer-free four-quadrant high-voltage variable frequency power supply topological structure |
CN102664535A (en) * | 2012-04-10 | 2012-09-12 | 江苏力普电子科技有限公司 | Four-quadrant high-voltage variable-frequency speed regulating system topology based on MMC (modular multilevel converter) transformer without phase shift |
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 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108539779A (en) * | 2018-02-09 | 2018-09-14 | 南瑞集团有限公司 | Total power variable-ratio pumped storage based on MMC |
CN113606119A (en) * | 2021-08-27 | 2021-11-05 | 西安热工研究院有限公司 | Variable-speed constant-frequency compressed air energy storage power generation system |
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Application publication date: 20150729 |