CN107181413A - Mixed type direct current power electronic transformer - Google Patents
Mixed type direct current power electronic transformer Download PDFInfo
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- CN107181413A CN107181413A CN201710577477.XA CN201710577477A CN107181413A CN 107181413 A CN107181413 A CN 107181413A CN 201710577477 A CN201710577477 A CN 201710577477A CN 107181413 A CN107181413 A CN 107181413A
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- Prior art keywords
- voltage
- direct current
- bridge
- converter
- phase
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Classifications
-
- 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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33515—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 with automatic control of the output voltage or current, e.g. flyback converters with digital control
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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
-
- 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
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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
- H02M7/4815—Resonant converters
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- 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 discloses a kind of mixed type direct current power electronic transformer, it is related to the converting means technical field of voltage.The transformer includes more than one double active bridge DC converter and more than two resonance type DC converters, and DC converter meets power network high-power use requirement using input and output connection in series-parallel form.The present invention realizes that the active of transimission power or output voltage is adjusted by the phase shifting control of double active bridge DC converters in mixed type direct current power electronic transformer；Resonance type DC converter works in resonant condition, according to the change adjust automatically transimission power for inputting and exporting DC voltage；Pulse interlacing control technology is used between multiple DC converters, to reduce the ripple of input and output DC voltage.Mixed type direct current power electronic transformer takes full advantage of the flexible control ability of double active bridges and the high efficiency of controlled resonant converter, improves the practicality of direct current power electronic transformer.
Description
Technical field
The present invention relates to the converting means technical field of voltage, more particularly to a kind of mixed type direct current power electronic transformer
Device.
Background technology
Direct current power electronic transformer is following direct current transmission and distribution net, direct current wind power-generating grid-connected system, direct current photovoltaic hair
The visual plant of the application field such as electric grid-connected system, ships power system, track drawing electric power system, " energy internet ", its
Major function is to realize voltage transformation, electrical isolation and the power transmission between different voltage levels direct current buses.
Electric power electric transformer generally uses modularized circuit connection in series-parallel skill to adapt to high-power application scenario
Art, to solve the restricted problem that the resistance to voltage levels of power electronic devices are not enough.The module that current direct current power electronic transformer is used
Changing circuit mainly has two classes, i.e., double active bridge DC converters (Dual Active Bridge, DAB) based on phase shifting control and
Series resonance-type DC converter (Series Resonant Convert, SRC).Double active bridge DC converter controls are flexible,
The active regulation of output voltage or transimission power can be realized, but it is comparatively less efficient, and series resonance-type DC converting
When device works in resonant condition, with very high power conversion efficiency, but comparatively its voltage or transmission power adjustment ability
Limited, when carrying out power adjusting, series resonance code converter will be in off resonance state or in discontinuous current state, so as to drop
Low power conversion efficiency or power density.
Therefore, the direct current power electronic transformer practicality being made up of single modularized circuit is by a definite limitation.
The content of the invention
The technical problems to be solved by the invention are how to provide one kind to realize voltage using double active bridge DC converters
Or the active of power is adjusted and the mixed type direct current power electronics of high power transmission is realized using series resonance-type DC converter
Transformer.
In order to solve the above technical problems, the technical solution used in the present invention is：A kind of mixed type direct current power electronics becomes
Depressor, it is characterised in that：Including more than one pair of active bridge DC converter and more than two series resonance-type direct currents
Converter, after being connected in series between described pair of active bridge DC converter and the direct current input side of series resonance-type DC converter
Access high voltage dc bus, the voltage levels for adapting to high-pressure side dc bus；Double active bridge DC converters and series connection
Low-voltage direct bus is accessed between the DC output side of resonance type DC converter after parallel connection, for being carried to low-pressure side dc bus
For larger power；The active bridge DC converter is used to, by phase shifting control, realize the master of transimission power or output voltage
Dynamic regulation；The resonance type DC converter works in resonant condition, for according to input and output DC voltage change from
Dynamic adjustment transimission power；The mixed type direct current power electronic transformer works in voltage mode control or power adjusting pattern.
Further technical scheme is：The described pair of active bridge DC converter include the single-phase fully controlled bridge in the first high-pressure side,
First high frequency transformer and the single-phase fully controlled bridge of the first low-pressure side, the input of the single-phase fully controlled bridge in the first high-pressure side is the master
The direct current input side of dynamic bridge DC converter, output end and the first high frequency transformation of the single-phase fully controlled bridge in the first high-pressure side
The primary connection of device, the secondary input with the single-phase fully controlled bridge of the first low-pressure side of first high frequency transformer is connected,
The output end of the single-phase fully controlled bridge of first low-pressure side is the DC output side of described pair of active bridge DC converter.
Further technical scheme is：Described pair of active bridge DC converter also includes inductance Lt, first high pressure
The output end of the single-phase fully controlled bridge in side is through the inductance LtIt is connected with the primary of first high frequency transformer.
Further technical scheme is：The series resonance-type DC converter includes the single-phase full control in the second high-pressure side
Bridge, resonance circuit, the second high frequency transformer and the single-phase fully controlled bridge of the second low-pressure side, the single-phase fully controlled bridge in the second high-pressure side it is defeated
Enter direct current input side of the end for the series resonance-type DC converter, the output end warp of the single-phase fully controlled bridge in the second high-pressure side
The primary of the resonance circuit and second high frequency transformer be connected, second high frequency transformer secondary and described second
The input connection of the single-phase fully controlled bridge of low-pressure side, the output end of the single-phase fully controlled bridge of the second low-pressure side is the series resonance-type
The DC output side of DC converter.
Further technical scheme is：Capacitor is parallel between the two ends of the DC side of the single-phase fully controlled bridge.
Further technical scheme is：The umber of turn ratio of the high frequency transformer is according to double active bridge DC converters
Determined with series resonance code converter serial number mesh, height DC bus-bar voltage grade.
Further technical scheme is：The resonance circuit includes the electric capacity C being connected in seriesrAnd inductance Lr。
Further technical scheme is that described voltage mode control is specially：When low-voltage direct busbar voltage is relatively low
When, double active bridge DC converters use phase shifting control, increase phase shift ratio, and then increase transimission power, make output DC voltage
Rise；When low-voltage direct busbar voltage is higher, double active bridge DC converters use phase shifting control, reduce phase shift ratio, and then
Reduce transimission power, make the reduction of output DC voltage, by above-mentioned regulation, low-voltage direct busbar voltage is maintained reference
Value；During above-mentioned regulation, the input voltage of double active bridge DC converters and series resonance-type DC converter is with output
The change of voltage is redistributed, and keeps the total DC voltage of series connection constant for high voltage dc bus voltage.
Further technical scheme is that described voltage mode control is specially：It is double when needing increase transimission power
Active bridge DC converter uses phase shifting control, increases phase shift ratio；When needing to reduce transimission power, double active bridge DC convertings
Device uses phase shifting control, reduces phase shift ratio, by above-mentioned regulation, the power for being transferred to low-voltage direct bus is reached reference
Value；During above-mentioned regulation, the transimission power of double active bridge DC converters and series resonance-type DC converter is with total biography
The change of defeated power is redistributed.
Further technical scheme is：The phase shifting control is using single phase shifting control, two-track phase control or multiple phase shift
Control；Described phase shifting control can use PI controllers, and controller input is voltage deviation value, and controller is output as phase shift ratio.
It is using the beneficial effect produced by above-mentioned technical proposal：The electric power electric transformer is straight using double active bridges
Current converter realizes the active regulation of voltage or power, and realizes high power transmission using series resonance-type DC converter, collects
The two respective advantage has been closed, the practicality of direct current power electronic transformer is improved.Realizing direct current power electronic transformer
While output voltage or transmitted in both directions power are flexibly controlled, series resonance-type inverter power conversion efficiency height, work(are remained
The big advantage of rate density, further increases the practicality of direct current power electronic transformer.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 be in the embodiment of the present invention mixed type direct current power electronic transformer containing a double active bridge DC converters and
Circuit theory diagrams during two series resonance-type DC converters；
Fig. 2 is the voltage control principle drawing of mixed type direct current power electronic transformer in the embodiment of the present invention；
Fig. 3 is the power adjusting schematic diagram of mixed type direct current power electronic transformer in the embodiment of the present invention；
Fig. 4 be in the embodiment of the present invention mixed type direct current power electronic transformer containing a double active bridge DC converters and
Trigger waveform figure during two series resonance-type DC converters；
Fig. 5 be in the embodiment of the present invention mixed type direct current power electronic transformer containing a double active bridge DC converters and
Voltage control simulation waveform during two series resonance-type DC converters；
Fig. 6 be in the embodiment of the present invention mixed type direct current power electronic transformer containing a double active bridge DC converters and
Power adjusting simulation waveform during two series resonance-type DC converters；
Wherein：1st, the single-phase fully controlled bridge 2 in the first high-pressure side, the first high frequency transformer 3, the single-phase fully controlled bridge of the first low-pressure side
4th, the single-phase fully controlled bridge in the second high-pressure side, the 5, second high frequency transformer 6, the single-phase fully controlled bridge 7 of the second low-pressure side, high voltage dc bus
8th, low-voltage direct bus.
Embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground is described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still the present invention can be with
It is different from other manner described here using other to implement, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar popularization, therefore the present invention is not limited by following public specific embodiment.
Overall, the invention discloses a kind of mixed type direct current power electronic transformer, including more than one double actives
Bridge DC converter and more than two series resonance-type DC converters.Described pair of active bridge DC converter and series connection are humorous
High voltage dc bus is accessed after being connected in series between the direct current input side of type DC converter, it is female for adapting to high-pressure side direct current
The voltage levels of line；Between the DC output side of double active bridge DC converters and series resonance-type DC converter after parallel connection
Low-voltage direct bus is accessed, for providing larger power to low-pressure side dc bus；The active bridge DC converter is used for
By phase shifting control, the active regulation of transimission power or output voltage is realized；The resonance type DC converter works in resonance
State, for according to the change adjust automatically transimission power for inputting and exporting DC voltage；The mixed type direct current power electronics
Transformer works in voltage mode control or power adjusting pattern.
Specifically, as shown in figure 1, the mixed type direct current power electronic transformer disclosed in the embodiment of the present invention, including
One double active bridge DC converter and two series resonance-type DC converters.
Further, as shown in figure 1, the described pair of active bridge DC converter includes the single-phase fully controlled bridge in the first high-pressure side, the
One high frequency transformer and the single-phase fully controlled bridge of the first low-pressure side.The input of the single-phase fully controlled bridge in first high-pressure side is the active
The direct current input side of bridge DC converter, output end and first high frequency transformer of the single-phase fully controlled bridge in the first high-pressure side
Primary connection, the secondary input with the single-phase fully controlled bridge of the first low-pressure side of first high frequency transformer is connected, institute
State DC output side of the output end of the single-phase fully controlled bridge of the first low-pressure side for described pair of active bridge DC converter.
It is preferred that, as shown in figure 1, described pair of active bridge DC converter also includes inductance Lt, the first high-pressure side list
The output end of phase full-controlled bridge is through the inductance LtIt is connected with the primary of first high frequency transformer.
Further, as shown in figure 1, the series resonance-type DC converter include the single-phase fully controlled bridge in the second high-pressure side,
Resonance circuit, the second high frequency transformer and the single-phase fully controlled bridge of the second low-pressure side.The input of the single-phase fully controlled bridge in second high-pressure side
Hold as the direct current input side of the series resonance-type DC converter, the output end of the single-phase fully controlled bridge in the second high-pressure side is through institute
The primary for stating resonance circuit and second high frequency transformer is connected, second high frequency transformer it is secondary with it is described second low
The input connection of the single-phase fully controlled bridge in side is pressed, the output end of the single-phase fully controlled bridge of the second low-pressure side is straight for the series resonance-type
The DC output side of current converter.
It is preferred that, as shown in figure 1, the direct current input side of the single-phase fully controlled bridge in the first high-pressure side is parallel with electric capacity C1, institute
The direct current input side for stating the single-phase fully controlled bridge in the second high-pressure side is parallel with electric capacity C2, the single-phase fully controlled bridge of the first low-pressure side and second
The DC output side of the single-phase fully controlled bridge of low-pressure side is parallel with electric capacity C0。
Further, described high frequency transformer T, its umber of turn compares ntAccording to double active bridge DC converters and series connection
Resonant converter series connection number, the determination of height DC bus-bar voltage grade, general, when series connection number is few, its umber of turn
Than larger.
As shown in Fig. 2 described mixed type direct current power electronic transformer voltage mode control basic functional principle is：When
Low-voltage direct busbar voltage UoWhen relatively low, double active bridge DC converters use phase shifting control, and increase phase shift increases than D
Transimission power, raises output DC voltage；As low-voltage direct busbar voltage UoWhen higher, double active bridge DC converters are used
Phase shifting control, reduces phase shift than D, and then reduces transimission power, makes the reduction of output DC voltage.It is finally, low by above-mentioned regulation
Press DC bus-bar voltage UoMaintain reference value Uo_ref.Described phase shifting control can using single phase shifting control, two-track phase control and
Multiple phase shifting control.During above-mentioned regulation, the input of double active bridge DC converters and series resonance-type DC converter
Voltage can be redistributed with the change of output voltage, and keep the total DC voltage of series connection constant for high voltage dc bus voltage.Institute
The phase shifting control stated can use PI controllers, and controller input is voltage deviation value (Uo_ref-Uo), it is output as phase shift and compares D.
As shown in figure 3, described mixed type direct current power electronic transformer power adjusting pattern basic functional principle is：When
When needing increase transimission power, double active bridge DC converters use phase shifting control, and D is compared in increase phase shift；Transmitted when needing to reduce
During power, double active bridge DC converters use phase shifting control, reduce phase shift and compare D.By above-mentioned regulation, finally, it is transferred to low
Press the power P of dc busoReach reference value Po_ref.Described phase shifting control can using single phase shifting control, two-track phase control and
Multiple phase shifting control.During above-mentioned regulation, the transmission of double active bridge DC converters and series resonance-type DC converter
Power is redistributed with the change of overall transmission power.Described phase shifting control can use PI controllers, and controller input is power
Deviation (Po_ref-Po), controller is output as phase shift and compares D.
Described series resonance-type DC converter is operated in resonant condition, the single-phase fully controlled bridge generation work frequency in its high-pressure side
Rate is the square-wave voltage of resonant frequency.Series resonance-type DC converter 1 and series resonance-type DC converter 2 are handed over by pulse
Mistake control, makes the square-wave voltage phase cross-over of the two, realizes the purpose for reducing input and output current ripple, and then reduce direct current
Busbar voltage ripple.
As shown in figure 4, when the shifting of double active bridge DC converters is in a ratio of D, the single-phase fully controlled bridge trigger pulse in high-pressure side
The single-phase fully controlled bridge trigger pulse of the advanced low-pressure side of phase phase, its time is at intervals of DTs, TsFor switching frequency.Series resonance
The phase shifting of trigger pulse between the single-phase fully controlled bridge in high-pressure side of type DC converter 1 and series resonance-type DC converter 2
Ts/ 4 time intervals, realize Interleaved control.
In order to further verify the feasibility and correctness of embodiment, mixed type direct current power electronic transformer is distinguished
Carry out voltage control and power adjusting controls emulation, as a result as shown in Figure 5 and Figure 6.
As shown in figure 5, when mixed type direct current power electronic transformer works in voltage mode control, giving output voltage ginseng
Value 3000V is examined, when 0.05 second, load is disturbed, and low-voltage direct bus is under voltage control action, after its magnitude of voltage falls
Recover to reference value to be still maintained at 3000V when 0.1.During regulation, double active bridge DC converters and two series resonance-types
The input voltage of DC converter can be redistributed with the change of output voltage, and keep the total DC voltage of series connection to be HVDC
Busbar voltage 9000V is constant.
As shown in fig. 6, when mixed type direct current power electronic transformer works in power adjusting pattern, initially giving output work
Rate reference value 1MW, when 0.05 second, power output reference value is changed into 0.8MW, and mixed type direct current power electronic transformer is in power
Adjust under control action, its output power value is changed into 0.8MW.During regulation, double active bridge DC converters and two series connection
The input voltage of resonance type DC converter can be redistributed with the change of output voltage, and keep the total DC voltage of series connection to be height
Press DC bus-bar voltage 9000V constant.
Claims (10)
1. a kind of mixed type direct current power electronic transformer, it is characterised in that：Including more than one pair of active bridge DC converting
Device and more than two series resonance-type DC converters, described pair of active bridge DC converter and series resonance-type direct current become
High voltage dc bus is accessed after being connected in series between the direct current input side of parallel operation, the high voltage for adapting to high-pressure side dc bus
Grade；Between the DC output side of double active bridge DC converters and series resonance-type DC converter low-pressure direct is accessed after parallel connection
Bus is flowed, for providing larger power to low-pressure side dc bus；The active bridge DC converter is used to pass through phase shift control
System, realizes the active regulation of transimission power or output voltage；The resonance type DC converter works in resonant condition, for root
According to the change adjust automatically transimission power for inputting and exporting DC voltage；The mixed type direct current power electronic transformer is worked in
Voltage mode control or power adjusting pattern.
2. mixed type direct current power electronic transformer as claimed in claim 1, it is characterised in that：Described pair of active bridge direct current becomes
Parallel operation includes the single-phase fully controlled bridge in the first high-pressure side, the first high frequency transformer and the single-phase fully controlled bridge of the first low-pressure side, and described first is high
The input for pressing the single-phase fully controlled bridge in side is the direct current input side of the active bridge DC converter, and first high-pressure side is single-phase complete
The primary for controlling output end and first high frequency transformer of bridge is connected, first high frequency transformer secondary and described first
The input connection of the single-phase fully controlled bridge of low-pressure side, the output end of the single-phase fully controlled bridge of the first low-pressure side is straight for described pair of active bridge
The DC output side of current converter.
3. mixed type direct current power electronic transformer as claimed in claim 2, it is characterised in that：Described pair of active bridge direct current becomes
Parallel operation also includes inductance Lt, the output end of the single-phase fully controlled bridge in the first high-pressure side is through the inductance LtBecome with first high frequency
The primary connection of depressor.
4. mixed type direct current power electronic transformer as claimed in claim 1, it is characterised in that：The series resonance-type direct current
Converter includes the single-phase fully controlled bridge in the second high-pressure side, resonance circuit, the second high frequency transformer and the single-phase fully controlled bridge of the second low-pressure side,
The input of the single-phase fully controlled bridge in second high-pressure side is the direct current input side of the series resonance-type DC converter, described the
Primary of the output end of the single-phase fully controlled bridge in two high-pressure sides through the resonance circuit and second high frequency transformer is connected, and described the
The secondary input with the single-phase fully controlled bridge of the second low-pressure side of two high frequency transformers is connected, and second low-pressure side is single-phase complete
The output end for controlling bridge is the DC output side of the series resonance-type DC converter.
5. the mixed type direct current power electronic transformer as described in any one in claim 2-4, it is characterised in that：The list
Capacitor is parallel between the two ends of the DC side of phase full-controlled bridge.
6. the mixed type direct current power electronic transformer as described in any one in claim 2-4, it is characterised in that：The height
The umber of turn ratio of frequency power transformer is according to double active bridge DC converters and series resonance code converter serial number mesh, height direct current
Busbar voltage grade is determined.
7. mixed type direct current power electronic transformer as claimed in claim 4, it is characterised in that：The resonance circuit includes string
Join the electric capacity C of connectionrAnd inductance Lr。
8. mixed type direct current power electronic transformer as claimed in claim 1, it is characterised in that described voltage mode control
Specially：When low-voltage direct busbar voltage is relatively low, double active bridge DC converters use phase shifting control, increase phase shift ratio, enter
And increase transimission power, raise output DC voltage；When low-voltage direct busbar voltage is higher, double active bridge DC converters
Using phase shifting control, reduce phase shift ratio, and then reduce transimission power, make the reduction of output DC voltage, by above-mentioned regulation, finally
Low-voltage direct busbar voltage is set to maintain reference value；During above-mentioned regulation, double active bridge DC converters and series resonance
The input voltage of type DC converter is redistributed with the change of output voltage, and keeps the total DC voltage of series connection to be HVDC
Busbar voltage is constant.
9. mixed type direct current power electronic transformer as claimed in claim 1, it is characterised in that described voltage mode control
Specially：When needing increase transimission power, double active bridge DC converters use phase shifting control, increase phase shift ratio；Work as needs
When reducing transimission power, double active bridge DC converters use phase shifting control, reduce phase shift ratio, by above-mentioned regulation, finally make
The power for being transferred to low-voltage direct bus reaches reference value；During above-mentioned regulation, double active bridge DC converters and series connection
The transimission power of resonance type DC converter is redistributed with the change of overall transmission power.
10. mixed type direct current power electronic transformer as claimed in claim 8 or 9, it is characterised in that：The phase shifting control is adopted
With single phase shifting control, two-track phase control or multiple phase shifting control；Described phase shifting control can use PI controllers, controller input
For voltage deviation value, controller is output as phase shift ratio.
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|---|---|---|---|
| CN201710577477.XA CN107181413A (en) | 2017-07-15 | 2017-07-15 | Mixed type direct current power electronic transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710577477.XA CN107181413A (en) | 2017-07-15 | 2017-07-15 | Mixed type direct current power electronic transformer |
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| CN109067165A (en) * | 2018-08-31 | 2018-12-21 | 辽宁荣信兴业电力技术有限公司 | High voltage direct current based on self-excitation mode-direct current power electronic transformer starts method |
| CN109302071A (en) * | 2018-10-18 | 2019-02-01 | 南京航空航天大学 | A kind of all-wave active rectification type LLC resonant converter and its control strategy |
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| CN110289767A (en) * | 2019-07-23 | 2019-09-27 | 哈尔滨理工大学 | A kind of low-loss commutator transformer of high no-load voltage ratio |
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| US11652396B2 (en) | 2020-06-30 | 2023-05-16 | Delta Electronics, Inc. | DC-DC resonant converter and control method thereof |
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| CN107612344A (en) * | 2017-09-28 | 2018-01-19 | 国网江苏省电力公司电力科学研究院 | A kind of pressure equalizing control method of the combined DC/DC converters of ISOS |
| CN107612344B (en) * | 2017-09-28 | 2020-08-14 | 国网江苏省电力公司电力科学研究院 | Voltage-sharing control method of ISOS combined DC/DC converter |
| WO2019196609A1 (en) * | 2018-04-11 | 2019-10-17 | 南京南瑞继保电气有限公司 | Bidirectional dc converter comprising two types of modules and control method therefor |
| CN110365213A (en) * | 2018-04-11 | 2019-10-22 | 南京南瑞继保电气有限公司 | A kind of two-way DC converter and its control method of the group of mould containing two types |
| CN110365213B (en) * | 2018-04-11 | 2021-06-18 | 南京南瑞继保电气有限公司 | Bidirectional direct current converter comprising two types of modules and control method thereof |
| CN109067165A (en) * | 2018-08-31 | 2018-12-21 | 辽宁荣信兴业电力技术有限公司 | High voltage direct current based on self-excitation mode-direct current power electronic transformer starts method |
| CN109302071A (en) * | 2018-10-18 | 2019-02-01 | 南京航空航天大学 | A kind of all-wave active rectification type LLC resonant converter and its control strategy |
| CN109687717A (en) * | 2019-01-23 | 2019-04-26 | 东南大学 | A kind of power adjustable LC input series and output parallel commutator transformer and control method |
| CN109687717B (en) * | 2019-01-23 | 2021-06-22 | 东南大学 | Power-adjustable LC input series output parallel direct current transformer and control method |
| CN112217406A (en) * | 2019-07-11 | 2021-01-12 | 台达电子工业股份有限公司 | Power supply device applied to solid-state transformer framework and three-phase power supply system |
| CN110289767A (en) * | 2019-07-23 | 2019-09-27 | 哈尔滨理工大学 | A kind of low-loss commutator transformer of high no-load voltage ratio |
| CN110535347A (en) * | 2019-07-31 | 2019-12-03 | 北京精密机电控制设备研究所 | A kind of space electric propulsion high-voltage pulse accumulation power supply circuit |
| CN110912412A (en) * | 2019-12-03 | 2020-03-24 | 中国科学院电工研究所 | Direct-current transformer and control method thereof |
| US11652396B2 (en) | 2020-06-30 | 2023-05-16 | Delta Electronics, Inc. | DC-DC resonant converter and control method thereof |
| US11799370B2 (en) | 2020-06-30 | 2023-10-24 | Delta Electronics, Inc. | DC-dC resonant converter and control method thereof |
| CN113556051A (en) * | 2021-07-21 | 2021-10-26 | 国网江苏省电力有限公司南通供电分公司 | Series-parallel hybrid connection power electronic transformer and control system |
| CN114785145A (en) * | 2022-04-28 | 2022-07-22 | 南京航空航天大学 | Low-input-current-ripple high-gain low-loss modular photovoltaic direct-current boost converter |
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