CN103427652A - High-voltage high-power DC-DC conversion device - Google Patents
High-voltage high-power DC-DC conversion device Download PDFInfo
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- CN103427652A CN103427652A CN2013103306885A CN201310330688A CN103427652A CN 103427652 A CN103427652 A CN 103427652A CN 2013103306885 A CN2013103306885 A CN 2013103306885A CN 201310330688 A CN201310330688 A CN 201310330688A CN 103427652 A CN103427652 A CN 103427652A
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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
- 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
- H02M3/33569—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 having several active switching elements
- H02M3/33576—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a high-voltage high-power DC-DC conversion device comprising a cascade modular converter, a medium- and low-frequency sinusoidal three-phase transformer and an input parallel modular converter. The cascade modular converter comprises three bridge arms the same in structure. Each of the upper and lower half bridge arm of each bridge arm comprises at least two half-bridge topology power modules and a reactor, wherein the power modules and the reactor are connected in series. The input end of the medium- and low-frequency sinusoidal three-phase transformer is respectively connected to contacts of the three bridge arms. The input parallel modular converter comprises a modular converter submodule or at least two mutually parallel modular converter submodules, and the input end of every modular converter submodule is connected to the output end of the medium- and low-frequency sinusoidal three-phase transformer. The high-voltage high-power DC-DC conversion device has the advantages that the problems of voltage withstanding, voltage sharing and insufficient transmission capacity in existing high-voltage side switching devices are solved well; the high-voltage high-power DC-DC conversion device is also significant to quickening the utilization and marketization process of high-voltage DC-DC conversion devices.
Description
Technical field
The present invention relates to the device of a kind of high voltage direct current-direct current energy conversion, transmission, particularly a kind of high-power DC-dc conversion device.
Background technology
High voltage direct current transmission (HVDC) has the characteristics such as the transmission power capacity is large, loss is little, fed distance is far away, good stability, has broad application prospects.In the future high voltage direct current transmission to be directly applied to power consumption equipment in order adapting to, need to have and exchange the functionally similar direct current transformation device of isolating transformer, high voltage direct current is converted to the low-voltage DC that power consumption equipment requires that meets of isolation.
Because the withstand voltage of single power semiconductor is normally limited, so single power semiconductor can't directly apply to the high voltage occasion.In order to realize that low voltage power devices can be applied in the high voltage occasion, usually adopt following several method: 1) multilevel converter; 2) a plurality of power semiconductor serial connection technologies; 3) a plurality of power model serial connection technologies.
Document " Dragan Jovcic. ' Bidirectional; High-Power DC Transformer ' .IEEE Transactions on Power Delivery; Vol.24; No.4; pp:2276-2283, October2009 " adopts Thyristors in series technology, harmonic technology to realize powerful DC converting and transmission.But high-pressure side and low-pressure side do not have electrical isolation, high-pressure side and low-pressure side thyristor valve group are all born high side voltage, have increased equipment cost.In addition, the LC resonant circuit produces larger reactive capability in the course of the work, has increased place capacity and line loss, has reduced conversion efficiency.
Chinese patent application 201010117551.8 has related to a kind of high voltage direct current-direct current power electronic transformer, and this commutator transformer consists of tandem type Modularized current transformer, double winding intermediate frequency or high frequency transformer and a full-control type H bridge.Produce intermediate frequency or the high frequency square wave voltage of many level by the tandem type Modularized current transformer, double winding intermediate frequency or high frequency transformer are realized voltage transformation and the power transmission of DC-to-DC, and full-control type H bridge converts the secondary square-wave voltage of intermediate frequency or high frequency transformer to direct voltage.
Chinese patent application 200810024744.1 has related to a kind of based on full-bridge topologies input series and output parallel automatically equalizing voltage commutator transformer, adopts the topological structure of the commutator transformer power model input series and output parallel of a plurality of full-bridge topologies.Utilize input series and output parallel structure and the effect of transformer side edge clamp, automatically realize that each module input side all presses.
In Chinese patent application 201010117551.8 and 200810024744.1, all adopted intermediate frequency or high frequency square wave transformer to carry out electrical isolation, voltage transformation and power transmission.But available intermediate frequency or high frequency square wave transformer efficiency capacity is difficult to reach more than up to a hundred kilowatts at present, limited to a certain extent the application of this type of commutator transformer.
Summary of the invention
Purpose of the present invention, be to provide a kind of high-power DC-dc conversion device, this converting means has utilized existing power model serial connection technology and the sinusoidal wave three-phase transformer of medium and low frequency dexterously, well solved withstand voltage, the voltage-sharing of high side switch device of current high voltage direct current-DC converter and the problem of existing DC-dc conversion device transmission capacity deficiency, significant to the practical and commercialization of accelerating high voltage direct current-DC converter.
In order to reach above-mentioned purpose, solution of the present invention is:
A kind of high-power DC-dc conversion device, comprise the tandem type Modularized current transformer, the sinusoidal wave three-phase transformer of medium and low frequency and input parallel modular current transformer;
Described tandem type Modularized current transformer comprises three brachium pontis that structure is identical, first brachium pontis of each brachium pontis comprises half-bridge topology power model and 1 reactor of at least 2 forwards of being connected successively to tail by head, second brachium pontis of each brachium pontis comprises 1 reactor of being connected successively to tail by head and the half-bridge topology power model of at least 2 forwards, and aforementioned 2 reactors are connected on contact; The head end of three brachium pontis connects the high-pressure side positive pole jointly, and tail end connects the high-pressure side negative pole jointly;
The input of the sinusoidal wave three-phase transformer of described medium and low frequency connects respectively the contact of three brachium pontis in the tandem type Modularized current transformer;
Described input parallel modular current transformer comprises at least one Modularized current transformer submodule, and the input of each Modularized current transformer submodule all connects the output of the sinusoidal wave three-phase transformer of medium and low frequency.
Above-mentioned half-bridge topology power model comprises two turn-off devices with anti-paralleled diode and an electric capacity, first and second turn-off device forward is connected in series, again with Capacitance parallel connection, the tie point of described first and second turn-off device is as the positive pole of half-bridge topology power model, and the negative pole of the second turn-off device is as the negative pole of half-bridge topology power model.
The sinusoidal wave three-phase transformer of above-mentioned medium and low frequency comprises 3 high input voltage windings and 3 low pressure output windings, adopts the connected mode of Y/Y, Y/ △, △/△ or △/Y.
Above-mentioned input parallel modular current transformer comprises at least two Modularized current transformer submodules, and the connected mode that the output employing of all Modularized current transformer submodules is sequentially connected, parallel with one another or connection in series-parallel mixes.
Above-mentioned Modularized current transformer submodule comprises passive filter module and the power conversion module of order series connection, wherein, the power conversion module adopts two Level Full Bridge topologys, many level half-bridges topology or many Level Full Bridges topology, and passive filter module adopts LC filter circuit or LCL filter circuit.
After adopting such scheme, the present invention utilizes existing power model serial connection technology and the sinusoidal wave three-phase transformer of medium and low frequency, withstand voltage, the voltage-sharing of high side switch device that can fine solution high voltage direct current-DC converter and the problem of existing DC-dc conversion device transmission capacity deficiency, significant to the practical and commercialization of accelerating high voltage direct current-DC converter; Adopt the module serial connection technology can expand flexibly the electric pressure of transformer; The sinusoidal wave three-phase transformer structure of employing medium and low frequency can realize electrical isolation, voltage transformation and the power transmission of high-pressure side and low-pressure side, more than the power capacity of the sinusoidal wave three-phase transformer of medium and low frequency can reach the MW level simultaneously.
The accompanying drawing explanation
Fig. 1 is high-power DC-dc conversion device main circuit overall structure figure of the present invention;
Fig. 2 is the topology diagram of half-bridge topology power model in the tandem type Modularized current transformer;
Fig. 3 is that in the present invention, submodule adopts two level three phase full bridge LC filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
OAdopt the Y type to connect;
Fig. 4 is that in the present invention, submodule adopts two level three phase full bridge LCL filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
OAdopt the Y type to connect;
Fig. 5 is that in the present invention, submodule adopts two level three phase full bridge LC filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
OAdopt the △ type to connect;
Fig. 6 is that in the present invention, submodule adopts two level three phase full bridge LCL filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
OAdopt the △ type to connect;
Fig. 7 is that in the present invention, submodule adopts three level three-phase neutral point clamp full-bridge LC filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
OAdopt the Y type to connect;
Fig. 8 is that in the present invention, submodule adopts three level three-phase neutral point clamp full-bridge LCL filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
OAdopt the Y type to connect;
Fig. 9 is that in the present invention, submodule adopts three level three-phase neutral point clamp full-bridge LC filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
OAdopt the △ type to connect;
Figure 10 is that in the present invention, submodule adopts three level three-phase neutral point clamp full-bridge LCL filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
OAdopt the △ type to connect;
Figure 11 is the equivalent control method schematic diagram of tandem type Modularized current transformer;
Wherein, (a) mean U
AcVoltage oscillogram, (b) mean U
A1Voltage oscillogram, (c) mean U
A2Voltage oscillogram;
Figure 12 is the brachium pontis contact voltage-phase schematic diagram of tandem type Modularized current transformer.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is elaborated.
As shown in Figure 1, the invention provides a kind of high-power DC-dc conversion device, comprise tandem type Modularized current transformer 1, the sinusoidal wave three-phase transformer 2 of medium and low frequency and input parallel modular current transformer 3, below introduce respectively.
Described tandem type Modularized current transformer 1 comprises three brachium pontis that structure is identical, it is natural number that upper and lower half brachium pontis of each brachium pontis respectively comprises M(M, and M >=2) individual half-bridge topology power model SM and 1 reactor, described first brachium pontis by head to tail connect successively SM and 1 reactor of M forward, and second brachium pontis by head to connect the successively SM of 1 reactor and M forward of tail, and 2 reactors of upper and lower half brachium pontis of three brachium pontis are connected on respectively contact A, B, C; The head end of three brachium pontis connects the high-pressure side positive pole jointly, and tail end connects the high-pressure side negative pole jointly.In the present embodiment, as shown in Figure 2, described half-bridge topology power model comprises two T of the turn-off device with anti-paralleled diode
11, T
12And capacitor C
11, concrete connected mode is: turn-off device T
11, T
12Forward is connected in series, then with capacitor C
11Parallel connection, described turn-off device T
11, T
12Tie point as the positive pole of SM, and T
12Negative pole as the negative pole of SM.
The sinusoidal wave three-phase transformer 2 of described medium and low frequency comprises 3 high input voltage windings and 3 low pressure output windings, its connected mode can adopt Y/Y, Y/ △, △/△ or △/Y, and the input terminal of 3 high input voltage windings is connected respectively the contact of three brachium pontis in tandem type Modularized current transformer 1.
Described input parallel modular current transformer 3 comprises that N(N is natural number, and 3 input terminals of N >=1) individual Modularized current transformer submodule, and each submodule are connected respectively the lead-out terminal of 3 low pressure output windings in the sinusoidal wave three-phase transformer 2 of medium and low frequency.
In input parallel modular current transformer 3, the output connected mode of Modularized current transformer submodule requires to carry out series, parallel or connection in series-parallel mixing according to the low-pressure side electric pressure; This submodule topology is in series by passive filter module and power conversion sequence of modules, wherein, passive filter module can adopt LC filter circuit or LCL filter circuit, and the power conversion module can adopt two Level Full Bridge topologys, many level half-bridges topology or many Level Full Bridges topology.Comparatively typical Modularized current transformer submodule topological structure has two level three phase full bridge LC filtering topologys (as Fig. 3 and Fig. 5), two level three phase full bridge LCL filtering topologys (as Fig. 4 and Fig. 6), three level three-phase neutral point clamp full-bridge LC filtering topologys (as Fig. 7 and Fig. 9) and three level three-phase neutral point clamp full-bridge LCL filtering topologys (as Fig. 8 and Figure 10); The left side of earlier figures 3 to Figure 10 connects DC terminal, and right side connects to exchange holds.
When the present invention works, tandem type Modularized current transformer 1 is shaped to the medium and low frequency sine voltage by direct voltage; The sinusoidal wave three-phase transformer 2 of described medium and low frequency carries out medium and low frequency and send energy, voltage transformation and electrical isolation, and the medium and low frequency frequency range is 30Hz～500Hz; Described input parallel modular current transformer 3 is reduced into direct voltage by aforementioned medium and low frequency sine voltage.
If the present invention is when steady operation, the high-pressure side DC bus-bar voltage is U
Dc, the voltage on each the brachium pontis power model clamping capacitance in tandem type Modularized current transformer 1 is U
Dc/ M, that is: the power model clamping capacitance voltage sum of half brachium pontis all equals DC bus-bar voltage U up and down
DcSimultaneously, due to the error of discrete control algolithm and the nonlinear characteristic of switching device and magnetic core element, cause power model clamping capacitance voltage U
CxHave certain fluctuation, general control is at U
Dc/ 2-h≤U
Cx≤ U
Dc/ 2+h, wherein h is stagnant endless belt.
In order clearly to analyze the operation principle of high-power DC-dc conversion device, now the high-pressure side tandem type Modularized current transformer of high voltage direct current-commutator transformer wherein one to be analyzed mutually, the high-pressure side DC bus is U
Dc, first brachium pontis output voltage is U
A1, second brachium pontis output voltage is U
A2, brachium pontis contact output voltage is U
Ac, have dirty relational expression to set up
U
a1+U
a2=U
dc （1.1）
N*U
cx=U
dc (1.2)
Known according to the KVL law, also there is following voltage relationship formula
U
a1=U
dc/2-U
ac (1.3)
U
a2=U
dc/2+U
ac (1.4)
Wherein, U
Ac, U
DcFor known quantity, so U
A1And U
A2Just can be by (1.3), (1.4) thus formula calculate and can go out to draw the power model reference voltage level of half brachium pontis up and down, the equivalent control method of the high-pressure side tandem type Modularized current transformer of high voltage direct current-commutator transformer is as shown in figure 11.
Control 120 ° of the output voltage phase phasic differences of each brachium pontis according to foregoing method, that is: U
A, U
B, U
C120 ° of phase phasic differences, as shown in figure 12, thereby can obtain transformer input terminal voltage U
A, U
B, U
CPhase phasic difference 120 degree symmetrically.
According to specific exemplary embodiment, invention has been described herein.It will be apparent carrying out to one skilled in the art suitable replacement or revise under not departing from the scope of the present invention.Exemplary embodiment is only illustrative, rather than, to the restriction of scope of the present invention, scope of the present invention is by appended claim definition.
Claims (5)
1. a high-power DC-dc conversion device, is characterized in that: comprise the tandem type Modularized current transformer, the sinusoidal wave three-phase transformer of medium and low frequency and input parallel modular current transformer;
Described tandem type Modularized current transformer comprises three brachium pontis that structure is identical, first brachium pontis of each brachium pontis comprises half-bridge topology power model and 1 reactor of at least 2 forwards of being connected successively to tail by head, second brachium pontis of each brachium pontis comprises 1 reactor of being connected successively to tail by head and the half-bridge topology power model of at least 2 forwards, and aforementioned 2 reactors are connected on contact; The head end of three brachium pontis connects the high-pressure side positive pole jointly, and tail end connects the high-pressure side negative pole jointly;
The input of the sinusoidal wave three-phase transformer of described medium and low frequency connects respectively the contact of three brachium pontis in the tandem type Modularized current transformer;
Described input parallel modular current transformer comprises at least one Modularized current transformer submodule, and the input of each Modularized current transformer submodule all connects the output of the sinusoidal wave three-phase transformer of medium and low frequency.
2. a kind of high-power DC-dc conversion device as claimed in claim 1, it is characterized in that: described half-bridge topology power model comprises two turn-off devices with anti-paralleled diode and an electric capacity, first and second turn-off device forward is connected in series, again with Capacitance parallel connection, the tie point of described first and second turn-off device is as the positive pole of half-bridge topology power model, and the negative pole of the second turn-off device is as the negative pole of half-bridge topology power model.
3. a kind of high-power DC-dc conversion device as claimed in claim 1 or 2, it is characterized in that: the sinusoidal wave three-phase transformer of described medium and low frequency comprises 3 high input voltage windings and 3 low pressure output windings, adopts the connected mode of Y/Y, Y/ △, △/△ or △/Y.
4. a kind of high-power DC-dc conversion device as claimed in claim 1, it is characterized in that: described input parallel modular current transformer comprises at least two Modularized current transformer submodules, and the connected mode that the output employing of all Modularized current transformer submodules is sequentially connected, parallel with one another or connection in series-parallel mixes.
5. a kind of high-power DC-dc conversion device as described as claim 1 or 4, it is characterized in that: described Modularized current transformer submodule comprises passive filter module and the power conversion module of order series connection, wherein, the power conversion module adopts two Level Full Bridge topologys, many level half-bridges topology or many Level Full Bridges topology, and passive filter module adopts LC filter circuit or LCL filter circuit.
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Cited By (9)
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|---|---|---|---|---|
| CN103633845A (en) * | 2013-12-19 | 2014-03-12 | 国家电网公司 | DC-DC (Direct-Current-Direct-Current) converter |
| CN105356756A (en) * | 2015-11-16 | 2016-02-24 | 上海交通大学 | Quasi-square wave modulation method for modularized isolation type battery energy storage converter |
| CN105375776A (en) * | 2015-11-16 | 2016-03-02 | 上海交通大学 | Sine wave modulation method for modular isolated battery energy storage converter |
| CN105391303A (en) * | 2015-11-16 | 2016-03-09 | 上海交通大学 | Rectangular wave modulation method for modular isolation type battery energy storage converter |
| CN106787861A (en) * | 2017-01-16 | 2017-05-31 | 华北电力大学 | Modular multilevel full-bridge mode of resonance electric power electric transformer topology |
| 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 |
| CN108306500A (en) * | 2018-01-10 | 2018-07-20 | 中国科学院电工研究所 | A kind of high pressure DC-DC converter |
| CN109546781A (en) * | 2018-10-09 | 2019-03-29 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of high-performance permanent magnet propulsion system topology |
| CN114123822A (en) * | 2021-12-06 | 2022-03-01 | 湖南大学 | Reusable grid-side converter for multi-flow locomotive |
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| CN103633845A (en) * | 2013-12-19 | 2014-03-12 | 国家电网公司 | DC-DC (Direct-Current-Direct-Current) converter |
| CN105391303B (en) * | 2015-11-16 | 2018-05-11 | 上海交通大学 | A kind of rectangular wave modulator approach of modularization isolated form battery energy storage converter |
| CN105391303A (en) * | 2015-11-16 | 2016-03-09 | 上海交通大学 | Rectangular wave modulation method for modular isolation type battery energy storage converter |
| CN105375776B (en) * | 2015-11-16 | 2018-03-23 | 上海交通大学 | A kind of sine wave modulation method of modularization isolated form battery energy storage converter |
| CN105356756A (en) * | 2015-11-16 | 2016-02-24 | 上海交通大学 | Quasi-square wave modulation method for modularized isolation type battery energy storage converter |
| CN105356756B (en) * | 2015-11-16 | 2018-05-11 | 上海交通大学 | A kind of quasi-square wave modulator approach of modularization isolated form battery energy storage converter |
| CN105375776A (en) * | 2015-11-16 | 2016-03-02 | 上海交通大学 | Sine wave modulation method for modular isolated battery energy storage converter |
| CN106787861A (en) * | 2017-01-16 | 2017-05-31 | 华北电力大学 | Modular multilevel full-bridge mode of resonance electric power electric transformer topology |
| CN106787861B (en) * | 2017-01-16 | 2019-02-05 | 华北电力大学 | Modular multilevel full-bridge mode of resonance electric power electric transformer topology |
| CN108306500B (en) * | 2018-01-10 | 2020-06-19 | 中国科学院电工研究所 | High-voltage DC-DC converter |
| CN108306500A (en) * | 2018-01-10 | 2018-07-20 | 中国科学院电工研究所 | A kind of high pressure DC-DC converter |
| 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 |
| CN109546781A (en) * | 2018-10-09 | 2019-03-29 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of high-performance permanent magnet propulsion system topology |
| CN114123822A (en) * | 2021-12-06 | 2022-03-01 | 湖南大学 | Reusable grid-side converter for multi-flow locomotive |
| CN114123822B (en) * | 2021-12-06 | 2023-06-23 | 湖南大学 | Reusable network side converter for multi-stream locomotive |
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Application publication date: 20131204 |