CN106329927A - Modular multilevel converter-based quasi-zero-current switch DC/DC converter - Google Patents
Modular multilevel converter-based quasi-zero-current switch DC/DC converter Download PDFInfo
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- CN106329927A CN106329927A CN201510341024.8A CN201510341024A CN106329927A CN 106329927 A CN106329927 A CN 106329927A CN 201510341024 A CN201510341024 A CN 201510341024A CN 106329927 A CN106329927 A CN 106329927A
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- pressure side
- low
- level converter
- converter
- modularization multi
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Classifications
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention provides a modular multilevel converter-based quasi-zero-current switch DC/DC converter. The DC/DC converter comprises a low-voltage side modular multilevel converter, an LCL resonance circuit and a high-voltage side modular multilevel converter, wherein the low-voltage side modular multilevel converter is connected with the high-voltage side modular multilevel converter through the LCL resonance circuit. According to the technical scheme provided by the invention, approximate soft switches of MMC converters on two sides are realized through the LCL resonance circuit, and loss is lowered; the electrical stress and voltage change rate of the LCL circuit are reduced through reasonable configuration of the number and the operating mode of sub modules of the MMC on two sides; the electromagnetic environment of the LCL is improved; and the reliability of the DC/DC converter is improved.
Description
Technical field
The present invention relates to a kind of DC converter, be specifically related to a kind of quasi-Zero Current Switch based on modularization multi-level converter
DC/DC changer.
Background technology
Direct current network technology based on customary DC and flexible direct current is for solving the safe and efficient remote conveying of extensive regenerative resource
Send, the problem such as large size city and island with power provides effective technological means.High-voltage large-capacity DC/DC changer is to build directly
One of Core equipment of stream network system, the connection that this equipment realizes each different voltage levels direct current transmission lines of electricity is mutual, and then
Form large-scale straight-flow system network.At present, the research of DC/DC changer technology is concentrated mainly on middle low power mesolow electricity
Pressure grade, along with constantly building and direct current network demand day by day urgent of hvdc transmission line, high-voltage large-capacity DC/DC becomes
Exchanger technology is urgently broken through.
One of critical equipment as direct current network, the main feature of DC/DC changer should include: 1. realizes different voltage levels direct current
The connection of network；2. direction of tide is two-way controlled；3. being lost low, operational efficiency is high；4. possesses Fault Isolation effect.DC/DC
Changer is generally divided into two classes, and a class is direct transformation, there is not exchange link in changer；Another kind of is indirect transformation, becomes
Parallel operation exists exchange link.By investigating the DC/DC converter topology of indirect transformation, possesses the topology knot of Technology Potential at present
Structure mainly has two kinds: a kind of is isolated form DC/DC converter topology based on MMC, and this changer low-pressure side and high-pressure side are changed
Stream device uses MMC inverter, and connects through intermediate-frequency transformer, but this design is due to the reason such as modulation strategy, topological structure
The MMC causing both sides cannot realize Sofe Switch, loss height under higher-frequency is run；Another kind is the conversion of LCL type DC/DC
Device, this changer low-pressure side and high-pressure side inverter use two levels full-bridge converters, and are connected through LCL circuit, at high voltage
Occasion need to use the mode that IGBT directly connects, this topology design to have a problem in that the voltage difference of AC very greatly, and inductance holds
Amount is relatively big, and uses Square operation pattern can deteriorate the electromagnetic environment of device.
Summary of the invention
Isolated form DC/DC transducer loose based on current MMC is high and high-voltage large-capacity medium-frequency isolation transformer used manufactures
The problem that in difficulty, LCL-DC/DC changer, the voltage stress of LCL circuit is big and changer electromagnetic environment is poor, the present invention
Proposing a kind of quasi-Zero Current Switch DC/DC changer based on modularization multi-level converter, this DC/DC changer utilizes LCL
Resonant network achieves the approximation Sofe Switch of both sides MMC, reduces loss；Submodule by reasonable disposition both sides MMC
Number and operational mode reduce electric stress and the voltage change ratio of LCL circuit, improve the electromagnetic environment of LCL, improve DC/DC
The reliability of changer.
It is an object of the invention to use following technical proposals to realize:
A kind of quasi-Zero Current Switch DC/DC changer based on modularization multi-level converter, it thes improvement is that, described
DC/DC changer includes low-pressure side modularization multi-level converter, LCL resonance circuit and the high-pressure side modular multilevel change of current
Device；Described low-pressure side modularization multi-level converter is connected by LCL resonance circuit and high-pressure side modularization multi-level converter.
Wherein, described low-pressure side modularization multi-level converter and high-pressure side modularization multi-level converter are by biphase four bridge legs structure
Becoming, two brachium pontis up and down of every phase are connected by current-limiting reactor, and described upper and lower two brachium pontis all include the MMC submodule of cascade.
Wherein, described MMC submodule is by direct current capacitors, two igbt chips, equalizing resistance and ultrahigh speed by-pass switch
Composition；The series connection of said two igbt chip forms igbt chip series arm, described ultrahigh speed by-pass switch and down tube IGBT
Parallel connection, described igbt chip series arm, equalizing resistance and direct current capacitors are in parallel, and MMC drawn by down tube IGBT colelctor electrode
The positive pole output of submodule, down tube IGBT emitter stage draws the negative pole output of MMC submodule.
Wherein, described low-pressure side MMC converter bridge arm submodule quantity is that low-pressure side DC voltage is divided by specified submodule electric capacity
The business of voltage rounds, and high-pressure side MMC converter bridge arm submodule quantity is (N+1) of low-pressure side MMC brachium pontis submodule quantity
/ 2～N times, wherein, N is the ratio of DC/DC changer high-pressure side and low-pressure side DC voltage.
Wherein, the AC of described low-pressure side modularization multi-level converter and high-pressure side modularization multi-level converter is in height
Frequently operating condition, a-c cycle all reaches 500Hz～2000Hz.
Wherein, described LCL resonance circuit includes two inductance and resonant capacitance, one end of one of them inductance and low-pressure side module
Change the one of multilevel converter to be connected；The other end is connected with one end of another inductance；The other end of another inductance and high pressure
The one of side modularization multi-level converter is connected；The two ends of described resonant capacitance connect the low-pressure side modular multilevel change of current respectively
Another phase of device and another phase of high-pressure side modularization multi-level converter.
Wherein, in described LCL resonance circuit, reactive power needed for two inductance is provided by resonant capacitance, it is ensured that low-pressure side module
The reactive power changing multilevel converter and the output of high-pressure side modularization multi-level converter is 0, to reduce low-pressure side and high-pressure side
The power attenuation of modularization multi-level converter, realize low-pressure side and high-pressure side modularization multi-level converter exchanges first-harmonic simultaneously
Voltage with exchange fundamental current same phase.
Wherein, described low-pressure side modularization multi-level converter and high-pressure side modularization multi-level converter all work in trapezoidal mode
Formula, the ac output voltage of low-pressure side modularization multi-level converter and high-pressure side modularization multi-level converter is trapezoidal wave electricity
Pressure.
Wherein, described low-pressure side modularization multi-level converter and high-pressure side modularization multi-level converter exchange trapeziodal voltage
Rising edge corresponds respectively to low-pressure side and exchanges fundamental current with high-pressure side and cross null range with trailing edge, reduces low-pressure side and height further
The switching loss of power device in the modularization multi-level converter of pressure side；And the slope of trapezoidal wave is controlled, it is simple to control LCL resonance
The voltage change ratio that circuit is born.
The excellent effect that the technical scheme that the present invention provides has is:
1, the changer both sides that the present invention provides use MMC inverter, bear high voltage by the series connection of half-bridge submodule, it is to avoid
IGBT device serial connection technology in LCL-DC/DC changer, it is high to can be applicable to electric pressure, application scenario that transmission capacity is big,
And autgmentability is strong；
2, the changer that the present invention provides uses LCL resonance circuit to connect two MMC inverters, it is to avoid based on MMC
The manufacture of isolated form DC/DC changer mesohigh Large Copacity medium-frequency isolation transformer limits, and effectively realizes low-pressure side and high-pressure side
Zero Reactive Power Control of MMC inverter and quasi-Zero Current Switch, reduce the loss of DC/DC changer.
3, the changer that the present invention provides is by configuring high-pressure side MMC submodule number and operational mode, can effectively reduce
The voltage stress of LCL circuit and the voltage change ratio born, improve the electromagnetic environment of DC/DC changer, and the system of improve can
By property.
Accompanying drawing explanation
Fig. 1 is based on modularization multi-level converter the quasi-Zero Current Switch DC/DC converter circuit figure that the present invention provides；
Fig. 2 is the Modularized multi-level converter sub-module structure chart that the present invention provides；
Fig. 3 is the trapezoidal working mode figure of modularization multi-level converter that the present invention provides, wherein: (a) is low-pressure end MMC
AC voltage and fundamental current oscillogram；B () is high-pressure side MMC AC voltage and fundamental current oscillogram.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in further detail.
The following description and drawings illustrate specific embodiments of the present invention fully, to enable those skilled in the art to put into practice it
?.Other embodiments can include structure, logic, electric, process and other change.Embodiment only generation
The change that table is possible.Unless explicitly requested, otherwise individually assembly and function are optional, and the order operated can change.
The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.The enforcement of the present invention
The scope of scheme includes the gamut of claims, and all obtainable equivalent of claims.In this article,
These embodiments of the present invention can be represented by " inventing " individually or generally with term, and this is only used to conveniently, and
And if in fact disclose the invention more than, be not meant to automatically to limit this application and in the range of any single invention or send out
Bright design.
The present invention provides a kind of quasi-zero current DC/DC changer based on modularization multi-level converter, as shown in Figure 1.Described
Changer includes low-pressure side modularization multi-level converter, LCL resonance circuit and high-pressure side modularization multi-level converter；Described
Low-pressure side modularization multi-level converter is connected by LCL resonance circuit and high-pressure side modularization multi-level converter.Described low pressure
Side modularization multi-level converter and high-pressure side modularization multi-level converter are constituted by biphase four bridge legs, two bridge up and down of every phase
Arm is connected by current-limiting reactor, and described upper and lower two brachium pontis all include the MMC submodule of cascade.
Described MMC submodule is as in figure 2 it is shown, include direct current capacitors, two igbt chips, two equalizing resistances and crystalline substance
Brake tube forms；Wherein, two igbt chip series connection form igbt chip series arm, and two equalizing resistance series connection are formed all
Voltage capacitance branch road, described igbt chip series arm, equalizing capacitance branch road and direct current capacitors are in parallel, described IGCT and IGBT
The parallel connection of one of chip, its anode connects the negative pole of direct current capacitors, and negative electrode connects the positive pole of direct current capacitors, the negative electrode of IGCT
Drawing the positive pole output of submodule, the anode of IGCT draws the negative pole output of submodule.
Described low-pressure side MMC converter bridge arm submodule quantity is that low-pressure side DC voltage is divided by specified submodule capacitor voltage
Business rounds, and high-pressure side MMC converter bridge arm submodule quantity is (N+1)/2～the N of low-pressure side MMC brachium pontis submodule quantity
Times, wherein, N is the ratio of DC/DC changer high-pressure side and low-pressure side DC voltage.
The AC output frequency of described low-pressure side modularization multi-level converter exchanges with high-pressure side modularization multi-level converter
Side output frequency is 500～2000Hz.
Described low-pressure side and high-pressure side modularization multi-level converter all work in trapezoidal wave pattern, described low-pressure side and high pressure side form
The AC trapeziodal voltage of massing multilevel converter staggers certain phase contrast, as shown in Fig. 3 (a), (b).Compared to
Square operation pattern in LCL-DC/DC changer, trapezoidal wave operational mode effectively reduces the voltage that LCL resonant network is born
Rate of change, improves the electromagnetic environment of system.
Described LCL resonance circuit includes two inductance and resonant capacitance, and how electric one end of one of them inductance is with low-pressure side modularity
The one of flat inverter is connected；One end of the other end and second inductance connects；The other end of second inductance and high-pressure side module
Change the one of multilevel converter to be connected；The two ends of resonant capacitance connect another phase of low-pressure side modularization multi-level converter respectively
Another phase with high-pressure side modularization multi-level converter.
In described LCL resonant network, electric capacity can provide the lagging reactive power needed for two inductance, thus realizes low-pressure side and high pressure
Zero Reactive Power Control of side modularization multi-level converter, reduces the electric energy loss that MMC inverter conveying reactive power causes,
Improve the meritorious capacity of DC/DC changer transmission.In conjunction with both sides MMC trapezoidal wave mode of operation, both sides MMC inverter
Power switch pipe is action near zero at respective alternating current, can realize MMC and approximate Zero Current Switch.
Based on modularization multi-level converter the quasi-Zero Current Switch DC/DC changer that the present invention provides, utilizes LCL resonance
The real-time performance approximation Sofe Switch of both sides MMC, reduces loss；Submodule number by reasonable disposition both sides MMC
And operational mode reduces electric stress and the voltage change ratio of LCL circuit, improve the electromagnetic environment of LCL, improve DC/DC and become
The reliability of parallel operation.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, although reference
The present invention has been described in detail by above-described embodiment, and those of ordinary skill in the field still can concrete to the present invention
Embodiment is modified or equivalent, and these are without departing from any amendment of spirit and scope of the invention or equivalent,
Within the claims of the present invention all awaited the reply in application.
Claims (9)
1. a quasi-Zero Current Switch DC/DC changer based on modularization multi-level converter, it is characterised in that described
DC/DC changer includes low-pressure side modularization multi-level converter, LCL resonance circuit and the high-pressure side modular multilevel change of current
Device；Described low-pressure side modularization multi-level converter is connected by LCL resonance circuit and high-pressure side modularization multi-level converter.
Quasi-Zero Current Switch DC/DC changer the most as claimed in claim 1, it is characterised in that described low-pressure side modularity
Multilevel converter and high-pressure side modularization multi-level converter are constituted by biphase four bridge legs, and two brachium pontis up and down of every phase are by string
Connection reactor connects, and described upper and lower two brachium pontis all include the MMC submodule of cascade.
Quasi-Zero Current Switch DC/DC changer the most as claimed in claim 2, it is characterised in that described MMC submodule
It is made up of direct current capacitors, two igbt chips, equalizing resistance and ultrahigh speed by-pass switch；Said two igbt chip string
Connection forms igbt chip series arm, and described ultrahigh speed by-pass switch is in parallel with down tube IGBT, the series connection of described igbt chip
Road, equalizing resistance and direct current capacitors are in parallel, and down tube IGBT colelctor electrode draws the positive pole output of MMC submodule, down tube IGBT
Emitter stage draws the negative pole output of MMC submodule.
Quasi-Zero Current Switch DC/DC changer the most as claimed in claim 2, it is characterised in that described low-pressure side MMC
Converter bridge arm submodule quantity is low-pressure side DC voltage to be rounded divided by the business of specified submodule capacitor voltage, high-pressure side MMC
Converter bridge arm submodule quantity is (N+1)/2 of low-pressure side MMC brachium pontis submodule quantity～N times, and wherein, N is DC/DC
Changer high-pressure side and the ratio of low-pressure side DC voltage.
Quasi-Zero Current Switch DC/DC changer the most as claimed in claim 2, it is characterised in that described low-pressure side modularity
The AC of multilevel converter and high-pressure side modularization multi-level converter is in high frequency operating condition, and a-c cycle all reaches
500Hz～2000Hz.
Quasi-Zero Current Switch DC/DC changer the most as claimed in claim 1, it is characterised in that described LCL resonance circuit
Including two inductance and resonant capacitance, one end of one of them inductance is connected with the one of low-pressure side modularization multi-level converter；
The other end is connected with one end of another inductance；One phase of the other end of another inductance and high-pressure side modularization multi-level converter
Connect；The two ends of described resonant capacitance connect another phase of low-pressure side modularization multi-level converter respectively and high-pressure side modularity is many
Another phase of level converter.
Quasi-Zero Current Switch DC/DC changer the most as claimed in claim 1, it is characterised in that described LCL resonance circuit
In reactive power needed for two inductance provided by resonant capacitance, it is ensured that low-pressure side modularization multi-level converter and high-pressure side module
The reactive power changing multilevel converter output is 0, to reduce the power damage of low-pressure side and high-pressure side modularization multi-level converter
Consumption, realizes exchanging fundamental voltage and exchanging fundamental current same phase of low-pressure side and high-pressure side modularization multi-level converter simultaneously.
Quasi-Zero Current Switch DC/DC changer the most as claimed in claim 2, it is characterised in that described low-pressure side modularity
Multilevel converter and high-pressure side modularization multi-level converter all work in trapezoidal wave pattern, the low-pressure side modular multilevel change of current
The ac output voltage of device and high-pressure side modularization multi-level converter is trapezoidal wave voltage.
Quasi-Zero Current Switch DC/DC changer the most as claimed in claim 8, it is characterised in that described low-pressure side modularity
Multilevel converter corresponds respectively to low with the rising edge exchanging trapeziodal voltage and the trailing edge of high-pressure side modularization multi-level converter
Pressure side exchanges fundamental current with high-pressure side and crosses null range, reduces merit in low-pressure side and high-pressure side modularization multi-level converter further
The switching loss of rate device；And the slope of trapezoidal wave is controlled, it is simple to control the voltage change ratio that LCL resonance circuit is born.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510341024.8A CN106329927B (en) | 2015-06-18 | 2015-06-18 | A kind of quasi- Zero Current Switch DC/DC converter based on modularization multi-level converter |
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| CN201510341024.8A CN106329927B (en) | 2015-06-18 | 2015-06-18 | A kind of quasi- Zero Current Switch DC/DC converter based on modularization multi-level converter |
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| CN106329927A true CN106329927A (en) | 2017-01-11 |
| CN106329927B CN106329927B (en) | 2019-02-22 |
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| CN107017778A (en) * | 2017-04-28 | 2017-08-04 | 上海英联电子系统有限公司 | New type of current trapezuim convertor |
| CN107911023A (en) * | 2017-11-07 | 2018-04-13 | 天津大学 | The more level dynamic switching DC DC transformers of cascade moduleization |
| CN108270356A (en) * | 2018-01-29 | 2018-07-10 | 浙江大学 | DC distribution network energy router and its control method based on PWM/ diode mixed-rectification structures |
| CN108599583A (en) * | 2018-07-05 | 2018-09-28 | 西南交通大学 | A kind of Universal flexible Energy Management System based on Modular multilevel converter |
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| CN104638930A (en) * | 2014-12-30 | 2015-05-20 | 国家电网公司 | High-voltage large-capacity DC/DC (Direct Current) converter suitable for DC power supply |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107017778A (en) * | 2017-04-28 | 2017-08-04 | 上海英联电子系统有限公司 | New type of current trapezuim convertor |
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| CN107911023A (en) * | 2017-11-07 | 2018-04-13 | 天津大学 | The more level dynamic switching DC DC transformers of cascade moduleization |
| CN108270356A (en) * | 2018-01-29 | 2018-07-10 | 浙江大学 | DC distribution network energy router and its control method based on PWM/ diode mixed-rectification structures |
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|---|---|
| CN106329927B (en) | 2019-02-22 |
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