CN104811056A - Permanent magnet synchronous motor converter device based on MMC structure - Google Patents
Permanent magnet synchronous motor converter device based on MMC structure Download PDFInfo
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- CN104811056A CN104811056A CN201510198372.4A CN201510198372A CN104811056A CN 104811056 A CN104811056 A CN 104811056A CN 201510198372 A CN201510198372 A CN 201510198372A CN 104811056 A CN104811056 A CN 104811056A
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- mmc
- synchronous motor
- converter device
- inversion module
- switching element
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a back-to-back permanent magnet synchronous wind power converter device based on modular multilevel converter (MMC) structure. A rectification module and an inversion module of the device both adopt the MMC structure and are formed by connecting a plurality of sub units in series. The input side of the rectification module of the device is directly connected with a permanent magnet synchronous motor and converts high voltage alternating current into direct current to input the current into the inversion module, the inversion module is connected with a power grid through a charging resistor and converts direct current into alternating current. The topological structure is four-quadrant and capable of achieving energy feedback. The converter device has the advantages of improving unit capacity and use functions of a wind power converter, reducing device cost and expanding the use functions.
Description
Technical field
The present invention relates to high-vol, especially based on the permagnetic synchronous motor converter device of MMC structure.
Background technology
The development trend of modern new forms of energy wind power generation is that blower fan individual capacity is increasing, and permagnetic synchronous motor is compared with double fed asynchronous machine, has obvious advantage.Its efficiency is high, power factor (PF) is high, capacity index is good, volume is little, lightweight, temperature rise is low, technical ability Be very effective, improves the quality factor of electrical network preferably.
The maximum single-machine capacity of current offshore wind farm magneto alternator reaches 6.5MW, and capacity has increasing trend.But existing fan outlet voltage is generally about 600-700V, cause the maximum outlet electric current of motor about 3000-6000A.Excessive Rated motor electric current makes that blower fan coiling sectional area is large, coiling quantity is many, manufacturing process difficulty is large, production cost is high.Full-power wind power converter mainly boost chopper+three-phase full-bridge inverter structure (as shown in Figure 1, Figure 2) that existing magneto alternator is supporting, or three phase full bridge+three phase full bridge topological structure back-to-back.These structures are due to switching tube rated voltage performance limitations, and current transformer exit potential is on the low side, cannot be supporting with high-voltage permanent magnet synchronous generator.
Therefore, improve the exit potential of Wind turbines, reducing rated current is following technology trends.
Summary of the invention
For solving the problems of the technologies described above, the object of this invention is to provide a kind of permagnetic synchronous motor converter device based on MMC structure.
The technical solution used in the present invention is:
Based on the permagnetic synchronous motor converter device of MMC structure, comprise and connect rectification module and inversion module in turn; This rectification module input is for connecting the stator side of magneto alternator, the output of this inversion module is for connecting AC network, 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.
Described permagnetic synchronous motor converter device also comprises the resistance charge circuit be serially connected between inversion module input and AC network, and this resistance charge circuit comprises charging resistor in parallel and by-pass switch.
The rotor-side of described magneto alternator is used for connecting fan blade pitch system.
Beneficial effect of the present invention:
Converter device of the present invention can bear very high voltage-rated, can be supporting with high-voltage permanent magnet synchronous generator easily and flexibly, compared with equivalent capability 6.5MW/690V wind turbine generator, 6KV electric pressure wind turbine generator rated current declines close to 90%, because the decline of rated current, greatly simplify the technique of blower fan, structure, improve reliability, reduce costs.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
Fig. 1 is magneto alternator+full-power wind power converter structure chart;
Fig. 2 is the three phase full bridge structure chart of inverter;
Fig. 3 is the access way schematic diagram of permagnetic synchronous motor converter device of the present invention;
Fig. 4 is permagnetic synchronous motor converter device of the present invention rectification 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
The present invention relates to a kind of wind electric converter topological structure based on MMC newly.MMC is the abbreviation of Modular Multilevel Converter--modular multi-level converter; This topological structure adopts modularization chain type cascaded structure, and as shown in Figure 3, rectification side modular valve group is directly connected with magneto alternator stator side; Rectification side is directly connected back-to-back with inverter side, and inverter side connects step-up transformer low voltage side by charge circuit, and high voltage side of transformer is directly connected with electrical network.Its advantage of this structure is to improve wind electric converter exit potential grade, increases capacity, and cellular construction is simple simultaneously, dismounting is easy, easy-to-connect.For achieving the above object, the present invention is achieved through the following technical solutions:
Based on the high-pressure blast electric converter topological structure of MMC, 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 directly connected with high-voltage permanent magnet synchronous generator; High Level AC Voltage is changed into direct current by rectification side; Inverter side is connected with AC network, and converting direct-current power into alternating-current power is delivered to electrical network; This topological structure can realize four-quadrant energy feedback.
As shown in Figure 4, described rectification, inversion module are completely equal, are divided into three-phase, and every being in series by the N number of subelement of even number is 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 (5)
1. based on the permagnetic synchronous motor converter device of MMC structure, it is characterized in that: comprise and connect rectification module and inversion module in turn; This rectification module input is for connecting the stator side of magneto alternator, the output of this inversion module is for connecting AC network, 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 permagnetic synchronous motor converter 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 permagnetic synchronous motor converter 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 permagnetic synchronous motor converter 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 inversion module input and AC network, this resistance charge circuit comprises charging resistor in parallel and by-pass switch.
5. the permagnetic synchronous motor converter device based on MMC structure according to claim 1, is characterized in that: the rotor-side of described magneto alternator is used for connecting fan blade pitch system.
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| CN201510198372.4A CN104811056A (en) | 2015-04-23 | 2015-04-23 | Permanent magnet synchronous motor converter device based on MMC structure |
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| CN201510198372.4A CN104811056A (en) | 2015-04-23 | 2015-04-23 | Permanent magnet synchronous motor converter device based on MMC structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106887958A (en) * | 2017-04-14 | 2017-06-23 | 成都信息工程大学 | Permagnetic synchronous motor is electronic and generating alternate run system and its adjusting method |
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2015
- 2015-04-23 CN CN201510198372.4A patent/CN104811056A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103066614A (en) * | 2012-12-31 | 2013-04-24 | 南方电网科学研究院有限责任公司 | Multi-end flexible direct current transmission system and starting method thereof |
| CN103337854A (en) * | 2013-05-17 | 2013-10-02 | 湖南大学 | Flexible direct-current power transmission access method based on intermediate frequency inversion |
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| CN106887958A (en) * | 2017-04-14 | 2017-06-23 | 成都信息工程大学 | Permagnetic synchronous motor is electronic and generating alternate run system and its adjusting method |
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Application publication date: 20150729 |