CN106100361B - A kind of ac-dc conversion circuit and electric power electric transformer - Google Patents
A kind of ac-dc conversion circuit and electric power electric transformer Download PDFInfo
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- CN106100361B CN106100361B CN201610483335.2A CN201610483335A CN106100361B CN 106100361 B CN106100361 B CN 106100361B CN 201610483335 A CN201610483335 A CN 201610483335A CN 106100361 B CN106100361 B CN 106100361B
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The present invention provides a kind of ac-dc conversion circuits, three-phase instantaneous power is coupled by coupling unit and is added, the fundamental frequency being effectively offset on each phase bridge arm and two double-frequency fluctuations, it no longer needs to that large value capacitor is installed on each change of current subelement to inhibit single-phase fluctuating power, substantially reduce the volume of ac-dc conversion circuit, if the ac-dc conversion circuit is applied to electric power electric transformer, the volume of electric power electric transformer can be equally effectively reduced, its cost is reduced.
Description
Technical field
The present invention relates to electrical equipment technical fields, and in particular to a kind of ac-dc conversion circuit and power electronics transformation
Device.
Background technology
Electric power electric transformer is also known as solid-state transformer, is to cause people to be closed recently as Development of Power Electronic Technology
The novel power grid distribution transformer device of note.It uses newest electric electronic current change technology, and industrial-frequency alternating current is converted to high frequency
Alternating current or direct current, are then isolated with high frequency transformer, to realize the transformation of voltage and current, finally by high-frequency alternating current
Be converted to industrial-frequency alternating current or by DC inverter be industrial-frequency alternating current, power supply network users use.Electric power electric transformer removes
Have outside the functions such as transformation, isolation, the energy transmission of conventional transformer, it is mutual to be also equipped with reactive-load compensation, harmonic wave control, power grid
The functions such as connection, new-energy grid-connected are expected to be used widely in the following power grid.
In the prior art, the three-phase of the electric power electric transformer of traditional more level topology includes upper bridge arm and lower bridge
Arm, each bridge arm include multiple cascade submodules, and each submodule may include H bridges or Half bridge rectifier circuit.Pass through control
The quantity for making upper and lower bridge arm input submodule carries out single-phase voltage control.Because single-phase, there are power swings, single-phase in order to reduce
Voltage fluctuation caused by fluctuating power, it usually needs direct current capacitors is installed on each submodule to inhibit single-phase fluctuating power
Caused by voltage fluctuation can only increase single-phase electricity container appearance but since DC voltage fluctuation caused by single-phase fluctuating power is larger
Amount is effectively to inhibit single-phase fluctuating power, and the increase of capacity can bring the increase of direct current capacitors volume and the increasing of cost
Add, and then entire electric power electric transformer is caused to take up a large area, cost is high.
Invention content
Technical problems to be solved of the embodiment of the present invention are that electric power electric transformer in the prior art takes up a large area,
Cost is high.
For this purpose, an embodiment of the present invention provides following technical solutions：
An embodiment of the present invention provides a kind of ac-dc conversion circuit, including at least one set of AC-DC conversion module, every group
The AC-DC conversion module includes at least one converting branch, and every converting branch includes：
Multiple change of current subelements, correspond to three-phase alternating current respectively；
Multiple first DC/AC converting units, respectively with the DC side of the change of current subelement or the change of current subelement
DC side it is in series or in parallel after constitute total DC side connection；
The instantaneous power coupling of the first DC/AC converting units output in every phase is added to eliminate by coupling unit
The fluctuation of the instantaneous power in single-phase；
At least one AC/DC converting units are connect with one or more output end of the coupling unit；
And cascade Connection between the adjacent change of current subelement of same phase in the AC-DC conversion module, exchange interface from
The exchange side of the change of current subelement in per phase is drawn, and is electrically connected with the exchange of corresponding phase.
Ac-dc conversion circuit described in the embodiment of the present invention, AC/DC converting units in every converting branch
Output end is in series or in parallel, and will be in series or in parallel after the AC/DC converting units output end as isolation convert
DC interface.
Ac-dc conversion circuit described in the embodiment of the present invention, the coupling unit includes at least one transformer, described
The primary side side of transformer includes multiple primary side windings, respectively corresponding the first DC/AC converting units output end or
Total output end connection after the multiple first DC/AC converting units of person are in series or in parallel, secondary avris include at least one pair side around
Group, described in the output end after the output end or multiple vice-side windings of each vice-side winding are in series or in parallel is used as
The output end of coupling unit is connect with the input terminal of the AC/DC converting units.
Ac-dc conversion circuit described in the embodiment of the present invention, the change of current subelement (11) include at least one first changing
Flow sub-circuit or the second change of current sub-circuit or third change of current sub-circuit or the 4th change of current sub-circuit；
First change of current sub-circuit includes first switch device (T1), second switch device (T2), the first diode
(D1) and the second diode (D2)；The first switch device (T1) and the second switch device (T2) series connection, described first
Diode (D1) and second diode (D2) respectively with the first switch device (T1) and the second switch device
(T2) common end of inverse parallel, the first switch device (T1) and the second switch device (T2) and second diode
(D2) exchange side of the anode as the change of current subelement (11), the cathode and the described 2nd 2 of first diode (D1)
DC side of the anode of pole pipe (D2) as the change of current subelement (11)；
Second change of current sub-circuit includes the 5th switching device (T1), the 6th switching device (T2), third switching device
(T3), the 4th switching device (T4), the 5th diode (D1), the 6th diode (D2), third diode (D3) and the four or two pole
It manages (D4)；The series arm of 5th switching device (T1) and the third switching device (T3) and the 6th switching device
(T2) it is connected in parallel with the series arm of the 4th switching device (T4), the 5th diode (D1), the six or two pole
Manage (D2), the third diode (D3) and the 4th diode (D4) respectively with the 5th switching device (T1), described
6th switching device (T2), the third switching device (T3) and the 4th switching device (T4) inverse parallel, the described 5th opens
Close common end and the 6th switching device (T2) and the 4th switch of device (T1) and the third switching device (T3)
Exchange side of the common end of device (T4) as the change of current subelement (11), described two series arms be connected in parallel after public affairs
DC side of the end as the change of current subelement (11) altogether；
The third change of current sub-circuit includes the 7th switching device (T1), the 8th switching device (T2), the 9th switching device
(T3), the 7th diode (D1), the 8th diode (D2), the 9th diode (D3) and the tenth diode (D4)；Described 7th opens
It closes device (T1) and the 8th switching device (T2) is connected in series with, the 7th diode (D1) and the 8th diode
(D2) respectively with the 7th switching device (T1) and the 8th switching device (T2) inverse parallel, the 9th diode (D3)
With the 9th switching device (T3) inverse parallel, and the anode of the 9th diode (D3) simultaneously with the 8th diode
(D2) anode connection, the cathode of the 9th diode (D3) are connect with the anode of the tenth diode (D4) simultaneously, institute
The cathode for stating the tenth diode (D4) is connect with the cathode of the 7th diode (D1), the 7th switching device (T1) and institute
The common end of the 8th switching device (T2) and the collector of the 9th switching device (T3) are stated as the change of current subelement
(11) exchange side, the cathode of the 7th diode (D1) and the anode of the 9th diode (D3) are as change of current
The DC side of unit (11)；
4th change of current sub-circuit includes the tenth switching device (T1), the 11st switching device (T2), the 12nd switch
Device (T3), the 13rd switching device (T4), the 14th switching device (T5), the 11st diode (D1), the 12nd diode
(D2), the 13rd diode (D3), the 14th diode (D4), the 15th diode (D5), the 16th diode (D6) and
17 diodes (D7)；Tenth switching device (T1) and the 12nd switching device (T3) are connected in series with, and the described tenth
One diode (D1) and the 13rd diode (D3) switch with the tenth switching device (T1) and the described 12nd respectively
Device (T3) inverse parallel；11st switching device (T2) and the 13rd switching device (T4) are connected in series with, and described
12 diodes (D2) and the 14th diode (D4) respectively with the 11st switching device (T2) and the described 13rd
Switching device (T4) inverse parallel；The anode of the emitter and the 13rd diode (D3) of 14th switching device (T5)
Connection, the collector of the 14th switching device (T5) are connect with the cathode of the 12nd diode (D2), and the described tenth
Five diodes (D5) and the 14th switching device (T5) inverse parallel；The anode of 16th diode (D6) and described the
The cathode of 15 diodes (D5) connects, the moon of the cathode and the 11st diode (D1) of the 16th diode (D6)
Pole connects, and the anode of the 17th diode (D7) is connect with the anode of the 14th diode (D4), and the described 17th
The cathode of diode (D7) is connect with the anode of the 13rd diode (D3), the tenth switching device (T1) and described
The public affairs of the common end of 12 switching devices (T3) and the 11st switching device (T2) and the 13rd switching device (T4)
Exchange side of the end as the change of current subelement (11) altogether, the cathode of the 11st diode (D1) and the 13rd pole
Manage a DC side of the anode of (D3) as the change of current subelement (11), the cathode of the 12nd diode (D2) and institute
State another DC side of the anode of the 14th diode (D4) as the change of current subelement (11).
Ac-dc conversion circuit described in the embodiment of the present invention, the change of current subelement include at least one combination change of current
Circuit；
The combination change of current sub-circuit is changed by first change of current sub-circuit, second change of current sub-circuit, the third
Flow sub-circuit and any two in the 4th change of current sub-circuit or multiple combinations composition.
Ac-dc conversion circuit described in the embodiment of the present invention further includes at least one direct current capacitors, with the AC/DC
The output end of converting unit or it is in series or in parallel after the AC/DC converting units output end connection, and will it is described directly
The output end of galvanic electricity container is as isolation conversion DC interface.
Ac-dc conversion circuit described in the embodiment of the present invention, per total anode of the change of current subelement of phase cascade Connection
It is connected together as the anode of DC interface, link together work per total cathode of the change of current subelement of phase cascade Connection
For the cathode of DC interface.
Ac-dc conversion circuit described in the embodiment of the present invention further includes the 2nd DC/AC converting units, with it is described be isolated turn
DC interface connection is changed, and exchange interface is converted using the output end of the 2nd DC/AC converting units as isolation.
The embodiment of the present invention additionally provides a kind of electric power electric transformer, including above-mentioned ac-dc conversion circuit.
Technical solution of the embodiment of the present invention, has the following advantages that：
An embodiment of the present invention provides a kind of ac-dc conversion circuits, and three-phase instantaneous power is coupled phase by coupling unit
Add, the fundamental frequency being effectively offset on each phase bridge arm and two double-frequency fluctuations, no longer needs to change each to inhibit single-phase fluctuating power
Large value capacitor is installed on stream subelement, the volume of ac-dc conversion circuit is substantially reduced, if by the ac-dc conversion
Circuit is applied to electric power electric transformer, can equally effectively reduce the volume of electric power electric transformer, reduce its cost.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is the structure diagram of a specific example of ac-dc conversion circuit in the embodiment of the present invention 1；
Fig. 2 is the circuit diagram of a specific example of transformer in 1 ac-dc conversion circuit of the embodiment of the present invention；
Fig. 3 is the circuit of a specific example of the first change of current sub-circuit in 1 ac-dc conversion circuit of the embodiment of the present invention
Schematic diagram；
Fig. 4 is the circuit of a specific example of the second change of current sub-circuit in 1 ac-dc conversion circuit of the embodiment of the present invention
Schematic diagram；
Fig. 5 is the circuit of a specific example of third change of current sub-circuit in 1 ac-dc conversion circuit of the embodiment of the present invention
Schematic diagram；
Fig. 6 is the circuit of a specific example of the 4th change of current sub-circuit in 1 ac-dc conversion circuit of the embodiment of the present invention
Schematic diagram；
Fig. 7 is the structure diagram of another specific example of ac-dc conversion circuit in the embodiment of the present invention 1.
Reference numeral：
1- AC-DC conversion modules；11- change of current subelements；The first DC/AC converting units of 12-；13- coupling units；14-
AC/DC converting units.
Specific implementation mode
The technical solution of the embodiment of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment be a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general
The every other embodiment that logical technical staff is obtained without making creative work belongs to what the present invention protected
Range.
In the description of the embodiment of the present invention, it should be noted that term "center", "upper", "lower", "left", "right",
The orientation or positional relationship of the instructions such as "vertical", "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings,
It is merely for convenience of the description embodiment of the present invention and simplifies to describe, not indicating or implying the indicated device or element must have
There is specific orientation, with specific azimuth configuration and operation, therefore is not considered as limiting the invention.In addition, term " the
One ", " second ", " third " are used for description purposes only, and are not understood to indicate or imply relative importance.
In the description of the embodiment of the present invention, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, can also be electrical connection；Can be directly connected, can also indirectly connected through an intermediary,
It can also be the connection inside two elements, can be wirelessly connected, can also be wired connection.For the common skill of this field
For art personnel, the concrete meaning of above-mentioned term in embodiments of the present invention can be understood with concrete condition.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It can be combined with each other at conflict.
Embodiment 1
A kind of ac-dc conversion circuit is present embodiments provided, as shown in Figure 1, including at least one set of AC-DC conversion module
1, every group of AC-DC conversion module 1 includes at least one converting branch, and every converting branch includes：
Multiple change of current subelements 11, correspond to three-phase alternating current respectively.It specifically, can be effectively by change of current subelement 11
Electric energy is converted and is controlled, such as can be by controlling the on off state of switching device and switch frequency in change of current subelement 11
Rate to carry out the processing such as rectification and AC voltage adjusting to alternating current.If the structure of the change of current subelement 11 in every converting branch is complete
Unanimously, then the number of the change of current subelement 11 to come into operation during every converting branch is per phase is consistent, to make change of current in every phase
The gross output of unit 11 is consistent；If the structure of the change of current subelement 11 in certain every converting branch is inconsistent, need
Ensure that the gross output of the change of current subelement 11 to come into operation in every phase is consistent.
Multiple first DC/AC converting units 12, respectively with the DC side of change of current subelement 11 or change of current subelement 11
The total DC side connection constituted after DC side is in series or in parallel.Specifically, it can determine that the first DC/AC turns according to specific requirements
The connection relation of unit 12 and 11 DC side of change of current subelement is changed, such as if necessary to reduce derailing switch in ac-dc conversion circuit
Number of packages amount, after the first DC/AC converting units 12 can be connected with the DC side of change of current subelement 11 in the every phase of the converting branch
The total DC side constituted is attached the amplitude of the voltage to promote the output of the first DC/AC converting units 12, reduces by the first DC/AC
Converting unit quantity, and then reduce switching device quantity；It certainly, then can be by the if necessary to reduce the electric current in switching device
One DC/AC converting units 12 and the converting branch per phase in change of current subelement 11 DC side parallel after total DC side for constituting into
Row connection.Such as converting branch per mutually include two mutually isostructural change of current subelements 11 when, in order to reduce switching device quantity,
The DC side of two change of current subelements 11 in every phase can be carried out to a series connection, by the total DC side constituted after series connection and the
The input terminal of one DC/AC converting units 12 connects, and can the usage quantity of the first DC/AC converting units 12 be reduced half, when
If right switching device pressure resistance is not high enough, the quantity of the first DC/AC converting units 12 cannot be reduced, it can be by each change of current
The DC side of unit 11 is connect with the input terminal of a first DC/AC converting unit 12, or by the first DC/AC converting units 12
It is attached with the total DC side constituted after the DC side parallel of change of current subelement 11 in the every phase of the converting branch, it is each to reduce
The voltage that switching device is born；If there are two direct current side ports for each change of current subelement 11, can be by each direct current side
Mouth regards the DC side of the change of current subelement 11 as, connect with the input terminal of a first DC/AC converting unit 12, also may be used respectively
Using the DC side as the change of current subelement 11 after the direct current side ports of change of current subelement 11 are connected, only connection one first
The input terminal of DC/AC converting units 12；First DC/AC converting units 12 can select any one DC/ in the prior art
The direct current that the DC side of each change of current subelement 11 exports is converted to square-wave voltage by AC conversion circuits, is preferably able to convert
For the DC/AC conversion circuits of medium-high frequency square-wave voltage.During the DC side of change of current subelement 11 is converted by DC/AC conversion circuits
Isolation coupling is carried out after high frequency square wave voltage again.
Coupling unit 13, the instantaneous power coupling that the first DC/AC converting units 12 in every phase are exported are added to eliminate
The fluctuation of instantaneous power in single-phase.Specifically, coupling unit 13 may include multiple input end and at least one output end, often
A input terminal can be connect with the output end of a first DC/AC converting unit 12 as needed, or with it is more in same phase
Total output end connection after a first DC/AC converting units 12 are in series or in parallel etc..
At least one AC/DC converting units 14 are connect with one or more output end of coupling unit 13.Specifically,
AC/DC converting units 14 can select in the prior art any one AC/DC conversion circuit by 13 three-phase coupling of coupled unit
Voltage after conjunction is converted to direct current.
And in AC-DC conversion module 1 same phase 11 cascade Connections of adjacent change of current subelement, exchange interface is from every phase
In the exchange side of change of current subelement 11 draw, with the exchange of corresponding phase electrical connection.Specifically, the friendship of some change of current subelement 11
Stream side and the exchange side of adjacent change of current subelement 11 are connected in series with, and so on, just constitute the adjacent change of current of same phase
The cascade Connection of unit, if an ac-dc conversion circuit includes multigroup AC-DC conversion module 1, all alternating current-direct currents
The exchange side of the change of current subelement 11 of same phase is cascaded in conversion module 1, has equally constituted adjacent change of current subelement 11
Between cascade Connection.
Specifically, Fig. 1 gives an ac-dc conversion circuit for including two groups of AC-DC conversion modules 1, exchanges interface
It draws from the common end of two groups of AC-DC conversion modules 1, is electrically connected with the exchange of corresponding phase.Under this mode, a, b, c three-phase separate
Not Ju You upper and lower two bridge arms, belong in different groups of AC-DC conversion module 1, can pass through one or more control
Device controls bridge arm voltage to control the quantity of upper and lower bridge arm input change of current subelement 11.Preferably, each bridge arm packet
Change of current subelement 11 containing identical quantity is more advantageous to the control for putting into, cutting out to change of current subelement 11 on bridge arm.Common tune
Mode processed include nearest level approach, carrier wave stacking, phase-shifting carrier wave etc..By taking a phases as an example, the electric current of bridge arm and upper is flowed through in a phases
Bridge arm both end voltage is
In formula, UdcFor DC voltage, IdcFor DC current, UacFor a phase phase voltage peak values, IacSide line electric current is exchanged for a phases
Peak value.
The instantaneous power for flowing through bridge arm in a phases is calculated by following formula：
Understand to include DC component, fundamental frequency wave component and two double-frequency fluctuation components in the instantaneous power of bridge arm in a phases.
The coupled unit 13 of high frequency square wave voltage that a, b, c three-phase in each converting branch are calculated by following formula couples
Output power afterwards：
Because of three alternate symmetrical operation of alternating current, 120 ° of difference, instantaneous by three-phase by coupling unit 13 between a, b, c phase
When power coupling is added, fundamental frequency and two double-frequency fluctuations are offset, it is ensured that the power that coupling unit 13 exports is substantially without fluctuation.It is not necessarily to
It is to inhibit the fluctuation of single-phase instantaneous power and large value capacitor is installed on each change of current subelement 11 again, substantially reduces friendship
Ac-dc conversion circuit in the present embodiment is applied to the electric power such as electric power electric transformer and set by the volume of DC transfer circuit
It is standby, the volume of electric power electric transformer can be equally effectively reduced, its cost is reduced.
Preferably, the ac-dc conversion circuit in the present embodiment, AC/DC converting units 14 in every converting branch it is defeated
Outlet is in series or in parallel, and will be in series or in parallel after AC/DC converting units 14 output end as isolation convert direct current
Interface.Specifically, by the parallel connection of the output end of the AC/DC converting units 14 in each converting branch, isolation can be further decreased
The fluctuation of the DC voltage of DC interface output is converted, and can be turned as needed from one or more AC/DC in parallel
The output end for changing unit 14 draws isolation conversion DC interface；By the output of the AC/DC converting units 14 in each converting branch
End series connection can increase the amplitude of the voltage of isolation conversion DC interface output.
Preferably, the ac-dc conversion circuit in the present embodiment, coupling unit 13 include at least one transformer, transformer
Primary side side include multiple primary side windings, the output end of the first corresponding DC/AC converting units 12 or multiple the respectively
Total output end connection after one DC/AC converting units 12 are in series or in parallel, secondary avris includes at least one vice-side winding, each
Output end of the output end as coupling unit 13 after the output end of vice-side winding or multiple vice-side windings are in series or in parallel,
It is connect with the input terminal of AC/DC converting units 14.It specifically, can according to demand, by the concatenated output end of multiple vice-side windings
As the output end of coupling unit 13, the amplitude of 13 output voltage of coupling unit can be increased；It can also be by multiple vice-side windings
Output end of the output end as coupling unit 13 after parallel connection, can further decrease the voltage wave of 13 output end of coupling unit
It is dynamic, and the current value in each vice-side winding.As shown in Fig. 2, entering a medium/high frequency transformer out for one three, pass through adjusting
The number of turns for the winding that former and deputy side is come into operation adjusts the no-load voltage ratio of transformer, the low-voltage dc voltage value that can be needed.Turn
The high frequency square wave voltage of the first DC/AC converting units 12 of each phase output in branch is changed through medium/high frequency transformer isolation coupling, exchange
Two double frequency powers of side in alternate autobalance, the power swing of each phase also can autobalance, no longer need to single in each change of current
Large value capacitor is installed in member 11, significantly reduces the volume and cost of entire ac-dc conversion circuit, while reducing bridge
The control difficulty that arm is pressed.
Preferably, as shown in figure 3, change of current subelement 11 includes at least one first change of current sub-circuit, first change of current son electricity
Road includes first switch device T1, second switch device T2, the first diode D1 and the second diode D2.
First switch device T1 and second switch device T2 series connection, the first diode D1 and the second diode D2 are respectively with the
The common end of one switching element T 1 and second switch device T2 inverse parallels, first switch device T1 and second switch device T2 and the
Exchange side of the anode of two diode D2 as change of current subelement 11, the sun of the cathode of the first diode D1 and the second diode D2
DC side of the pole as change of current subelement 11.Specifically, the change of current subelement 11 of above structure, under control of the controller, when
One switching element T 1 is connected, and when second switch device T2 is turned off, change of current subelement 11 puts into operation, and change of current subelement 11 is equivalent to
One DC source；When first switch device T1 is turned off, and second switch device T2 is connected, change of current subelement 11 is out of service, changes
Stream subelement 11 is externally equivalent to short circuit, is equivalent to and has directly bypassed the change of current subelement 11 out of service.Therefore pass through
The voltage of upper and lower bridge arm can be controlled by controlling the quantity for the change of current subelement 11 that upper and lower bridge arm puts into operation.
Preferably, as shown in figure 4, providing the structure of another change of current subelement 11, including at least one second change of current
Sub-circuit, the second change of current sub-circuit include that first switch device T1, second switch device T2, third switching element T the 3, the 4th are opened
Close device T4, the first diode D1, the second diode D2, third diode D3 and the 4th diode D4.
The series arm of first switch device T1 and third switching element T 3 and second switch device T2 and the 4th derailing switch
The series arm of part T4 is connected in parallel, D4 points of the first diode D1, the second diode D2, third diode D3 and the 4th diode
Not with first switch device T1, second switch device T2,4 inverse parallel of third switching element T 3 and the 4th switching element T, first opens
Close the common end conduct of the common end and second switch device T2 and the 4th switching element T 4 of device T1 and third switching element T 3
The exchange side of change of current subelement 11, two series arms be connected in parallel after DC side of the common end as change of current subelement 11.
Specifically, the change of current subelement 11 of above structure under the control of the controller, is opened when first if circuit failure free operation
When closing device T1 and the 4th switching element T 4 and being connected, change of current subelement 11 puts into operation, 11 first exit of change of current subelement and
A DC source is equivalent between second exit；When first switch device T1 and second switch device T2 conductings or third are opened
When closing device T3 and the conducting of the 4th switching element T 4, change of current subelement 11 is out of service, the first exit and the second exit
Between export 0 voltage.It is arranged by above structure, when change of current subelement 11 is out of service, this can be controlled by controller and changed
Flow first switch device T1 and second switch device T2, third switching element T 3 and the 4th switching element T 4 alternating of subelement 11
Rotation is connected with uniform switching loss；If circuit breaks down, be latched under control of the controller (shutdown) first switch device T1,
Second switch device T2, third switching element T 3 and the 4th switching element T 4, can cut off short circuit current, isolated fault.
Preferably, as shown in figure 5, providing the structure of the third change of current subelement 11, including at least one third change of current
Sub-circuit, third change of current sub-circuit include first switch device T1, second switch device T2, third switching element T the 3, the 1st
Pole pipe D1, the second diode D2, third diode D3 and the 4th diode D4.
First switch device T1 and second switch device T2 are connected in series with, the first diode D1 and the second diode D2 difference
With first switch device T1 and second switch device T2 inverse parallels, 3 inverse parallel of third diode D3 and third switching element T, and
The anode of third diode D3 connect with the anode of the second diode D2 simultaneously, the cathode of third diode D3 while with the four or two
The anode of pole pipe D4 connects, and the cathode of the 4th diode D4 is connect with the cathode of the first diode D1, first switch device T1 with
The common end of second switch device T2 and exchange side of the collector of third switching element T 3 as change of current subelement 11, the one or two
The DC side of the cathode of pole pipe D1 and the anode of third diode D3 as change of current subelement 11.Specifically, above structure changes
Subelement 11 is flowed, if circuit failure free operation, under the control of the controller, third switching element T 3 are constantly on, if the
One switching element T 1 is connected, and the T2 shutdowns of second switch device, then change of current subelement 11 puts into operation；If first switch device T1 is closed
Disconnected, second switch device T2 is connected, and change of current subelement 11 is out of service；If circuit breaks down, close under control of the controller
(shutdown) first switch device T1, second switch device T2 and third switching element T 3 are locked, short circuit current, isolation event can be cut off
Barrier.
Preferably, as shown in fig. 6, providing the structure of the 4th kind of change of current subelement 11, including at least one 4th change of current
Sub-circuit, the 4th change of current sub-circuit include that first switch device T1, second switch device T2, third switching element T the 3, the 4th are opened
Close device T4, the 5th switching element T 5, the first diode D1, the second diode D2, third diode D3, the 4th diode D4,
5th diode D5, the 6th diode D6 and the 7th diode D7.
First switch device T1 and third switching element T 3 are connected in series with, the first diode D1 and third diode D3 difference
With 3 inverse parallel of first switch device T1 and third switching element T；Second switch device T2 and the series connection of the 4th switching element T 4 connect
Connect, the second diode D2 and the 4th diode D4 respectively with 4 inverse parallel of second switch device T2 and the 4th switching element T；5th
The emitter of switching element T 5 is connect with the anode of third diode D3, the collector and the second diode of the 5th switching element T 5
The cathode of D2 connects, the 5th diode D5 and 5 inverse parallel of the 5th switching element T；The anode of 6th diode D6 and the five or two pole
The cathode of pipe D5 connects, and the cathode of the 6th diode D6 is connect with the cathode of the first diode D1, the anode of the 7th diode D7
It is connect with the anode of the 4th diode D4, the cathode of the 7th diode D7 is connect with the anode of third diode D3, first switch
The common end of device T1 and third switching element T 3 is used as with the common end of second switch device T2 and the 4th switching element T 4 and changes
Flow subelement 11 exchange side, the cathode of the first diode D1 and the anode of third diode D3 as change of current subelement 11 one
A DC side, another direct current of the cathode of the second diode D2 and the anode of the 4th diode D4 as change of current subelement 11
Side.
Table 1
Specifically, as shown in table 1, the change of current subelement 11 of above structure works normally the 1st kind of situation, in controller control
Under system, the T1 conductings of first switch device, the T2 shutdowns of second switch device, the shutdown of third switching element T 3, the 4th switching element T 4
(10011) are connected in conducting, the 5th switching element T 5, upper half module corresponding voltage Uc inputs, lower half module corresponding voltage Uc inputs.
It is 2Uc that change of current subelement 11 puts into voltage altogether.
The 2nd kind of situation is worked normally, under control of the controller, first switch device T1 conductings, second switch device T2 is led
Logical, third switching element T 3 turns off, the shutdown of the 4th switching element T 4, when the 5th switching element T 5 is connected (11001), upper half module
Corresponding voltage Uc inputs, lower half module are cut out, corresponding voltage 0.It is Uc that change of current subelement 11 puts into voltage altogether.
The 3rd kind of situation is worked normally, under control of the controller, first switch device T1 shutdowns, second switch device T2 is closed
Disconnected, third switching element T 3 is connected, and (00111) is connected in the 4th switching element T 4 conducting, the 5th switching element T 5, lower half module pair
Voltage Uc is answered to put into, upper half module is cut out, corresponding voltage 0.It is Uc that change of current subelement 11 puts into voltage altogether.
The 4th kind of situation is worked normally, under control of the controller, first switch device T1 shutdowns, second switch device T2 is led
Logical, third switching element T 3 is connected, and (01101) is connected in the 4th switching element T 4 shutdown, the 5th switching element T 5, and upper half module is cut
Go out, corresponding voltage 0.Lower half module is cut out, corresponding voltage 0.It is 0 that change of current subelement 11 puts into voltage altogether.
Therefore when circuit failure free operation, first switch device T1 and second switch device can be controlled by controller
Part T2 is connected with third switching element T 3 and the alternating rotation of the 4th switching element T 4, with uniform switching loss.
When circuit malfunctions, first switch device T1 is controlled by controller and is latched (pass to the 5th switching element T 5
It is disconnected), short circuit current, isolated fault can be cut off.
Preferably, the ac-dc conversion circuit in the present embodiment, change of current subelement 11 include at least one combination change of current
Circuit.
Combination change of current sub-circuit is changed by the first change of current sub-circuit, the second change of current sub-circuit, third change of current sub-circuit and the 4th
Any two or multiple combinations flowed in sub-circuit is constituted.
Specifically, the change of current subelement 11 in every converting branch can be the first change of current sub-circuit, second change of current son electricity
Road, third change of current sub-circuit, the 4th change of current sub-circuit or combination change of current sub-circuit in any one, or above-mentioned five
The composite structure that kind or the structure for having identical function are constituted after arbitrarily combining.
Preferably, the ac-dc conversion circuit in the present embodiment, first switch device T1, second switch device T2, third
Switching element T 3, the 4th switching element T 4 and the 5th switching element T 5 can select insulated gate bipolar transistor.Insulated gate is double
Bipolar transistor integrates the advantages of MOSFET and GTR, with input impedance is high, switching speed is fast, driving circuit is simple, logical
State voltage is low, can bear the advantages that high-voltage large current.It can certainly select triode, thyristor, metal-oxide-semiconductor etc. that there is switch
The connection in series-parallel of the device of function or above-mentioned switching device.
Preferably, as shown in fig. 7, ac-dc conversion circuit in the present embodiment, further includes at least one direct current capacitors,
With the output end of AC/DC converting units 14 or it is in series or in parallel after the output ends of AC/DC converting units 14 connect, and will
The output end of direct current capacitors is as isolation conversion DC interface.Specifically, pass through the output end company in AC/DC converting units 14
Direct current capacitors is connect, power swing can be further offset, keeps the transformed direct current of the isolation of output more stable.And it passes through
Coupling unit 13 has counteracted most of power swing, and direct current capacitors only need to choose the direct current capacitors of minimum capacitance i.e.
It can.
Preferably, the ac-dc conversion circuit in the present embodiment, per total anode of the change of current subelement 11 of phase cascade Connection
It is connected together as the anode of DC interface, is connected together as per total cathode of the change of current subelement 11 of phase cascade Connection
The cathode of DC interface.
Preferably, the ac-dc conversion circuit in the present embodiment further includes the 2nd DC/AC converting units, is converted with being isolated
DC interface connects, and converts exchange interface using the output end of the 2nd DC/AC converting units as isolation.Specifically, the 2nd DC/
AC converting units can select any one DC/AC conversion circuit in the prior art will be isolated conversion DC interface output every
It is low-voltage AC from transformed DC inverter.
Ac-dc conversion circuit in the present embodiment can be provided simultaneously with exchange interface, DC interface, isolation conversion direct current
Interface exchanges interface with isolation conversion, disclosure satisfy that the requirement of the various application occasions such as mesolow DC distribution net.
Embodiment 2
Present embodiments provide the ac-dc conversion circuit in a kind of electric power electric transformer, including embodiment 1.
Electric power electric transformer in the present embodiment, in ac-dc conversion circuit, by coupling unit by three-phase wink
When power coupling be added, the fundamental frequency being effectively offset on each phase bridge arm and two double-frequency fluctuations no longer need to inhibit single-phase fluctuation work(
Rate and large value capacitor is installed on each change of current subelement, substantially reduce the volume of ac-dc conversion circuit, Neng Gouyou
Effect reduces the volume of electric power electric transformer, reduces its cost.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (9)
1. a kind of ac-dc conversion circuit, which is characterized in that including at least one set of AC-DC conversion module (1), handed over described in every group
DC conversion modules (1) include at least one converting branch, and every converting branch includes：
Multiple change of current subelements (11), correspond to three-phase alternating current respectively；
Multiple first DC/AC converting units (12) are sub with the DC side of the change of current subelement (11) or the change of current respectively
The DC side rear total DC side connection constituted in series or in parallel of unit (11)；
Coupling unit (13), by every phase the first DC/AC converting units (12) output instantaneous power coupling be added with
Eliminate it is single-phase in the instantaneous power fluctuation；
At least one AC/DC converting units (14), connect with one or more output end of the coupling unit (13)；
And cascade Connection, exchange connect between the adjacent change of current subelement (11) of same phase in the AC-DC conversion module (1)
Mouth is drawn from the exchange side of the change of current subelement (11) in every phase, is electrically connected with the exchange of corresponding phase.
2. ac-dc conversion circuit according to claim 1, which is characterized in that the AC/DC in every converting branch
The output end of converting unit (14) is in series or in parallel, and will be in series or in parallel after the AC/DC converting units (14)
Output end is as isolation conversion DC interface.
3. ac-dc conversion circuit according to claim 1, which is characterized in that the coupling unit (13) includes at least one
The primary side side of a transformer, the transformer includes multiple primary side windings, and corresponding the first DC/AC conversions are single respectively
Total output end connection after the output end of first (12) or multiple first DC/AC converting units (12) are in series or in parallel, secondary side
Side includes at least one vice-side winding, the either multiple vice-side windings series connection or simultaneously of the output end of each vice-side winding
Output end of the output end as the coupling unit (13) after connection is connect with the input terminal of the AC/DC converting units (14).
4. ac-dc conversion circuit according to claim 1, which is characterized in that the change of current subelement (11) includes at least
One the first change of current sub-circuit or the second change of current sub-circuit or third change of current sub-circuit or the 4th change of current sub-circuit；
First change of current sub-circuit include first switch device (T1), second switch device (T2), the first diode (D1) and
Second diode (D2)；The first switch device (T1) and the second switch device (T2) series connection, first diode
(D1) and second diode (D2) is anti-simultaneously with the first switch device (T1) and the second switch device (T2) respectively
The sun of the common end and second diode (D2) of connection, the first switch device (T1) and the second switch device (T2)
Exchange side of the pole as the change of current subelement (11), the cathode and second diode (D2) of first diode (D1)
DC side of the anode as the change of current subelement (11)；
Second change of current sub-circuit include the 5th switching device (T1), the 6th switching device (T2), third switching device (T3),
4th switching device (T4), the 5th diode (D1), the 6th diode (D2), third diode (D3) and the 4th diode
(D4)；The series arm of 5th switching device (T1) and the third switching device (T3) and the 6th switching device
(T2) it is connected in parallel with the series arm of the 4th switching device (T4), the 5th diode (D1), the six or two pole
Manage (D2), the third diode (D3) and the 4th diode (D4) respectively with the 5th switching device (T1), described
6th switching device (T2), the third switching device (T3) and the 4th switching device (T4) inverse parallel, the described 5th opens
Close common end and the 6th switching device (T2) and the 4th switch of device (T1) and the third switching device (T3)
Exchange side of the common end of device (T4) as the change of current subelement (11), described two series arms be connected in parallel after public affairs
DC side of the end as the change of current subelement (11) altogether；
The third change of current sub-circuit include the 7th switching device (T1), the 8th switching device (T2), the 9th switching device (T3),
7th diode (D1), the 8th diode (D2), the 9th diode (D3) and the tenth diode (D4)；7th switching device
(T1) it is connected in series with the 8th switching device (T2), the 7th diode (D1) and the 8th diode (D2) are respectively
With the 7th switching device (T1) and the 8th switching device (T2) inverse parallel, the 9th diode (D3) and described
Nine switching devices (T3) inverse parallel, and the anode of the 9th diode (D3) while the anode with the 8th diode (D2)
The cathode of connection, the 9th diode (D3) is connect with the anode of the tenth diode (D4) simultaneously, the 12nd pole
The cathode of pipe (D4) is connect with the cathode of the 7th diode (D1), the 7th switching device (T1) and the 8th switch
Exchange side of the collector of the common end of device (T2) and the 9th switching device (T3) as the change of current subelement (11),
The cathode of 7th diode (D1) and the anode of the 9th diode (D3) are as the straight of the change of current subelement (11)
Flow side；
4th change of current sub-circuit includes the tenth switching device (T1), the 11st switching device (T2), the 12nd switching device
(T3), the 13rd switching device (T4), the 14th switching device (T5), the 11st diode (D1), the 12nd diode (D2),
13rd diode (D3), the 14th diode (D4), the 15th diode (D5), the 16th diode (D6) and the 17th
Pole pipe (D7)；Tenth switching device (T1) and the 12nd switching device (T3) are connected in series with, the 11st pole
Manage (D1) and the 13rd diode (D3) respectively with the tenth switching device (T1) and the 12nd switching device
(T3) inverse parallel；11st switching device (T2) and the 13rd switching device (T4) are connected in series with, and the described 12nd
Diode (D2) and the 14th diode (D4) switch with the 11st switching device (T2) and the described 13rd respectively
Device (T4) inverse parallel；The emitter of 14th switching device (T5) connects with the anode of the 13rd diode (D3)
It connecing, the collector of the 14th switching device (T5) is connect with the cathode of the 12nd diode (D2), and the described 15th
Diode (D5) and the 14th switching device (T5) inverse parallel；The anode and the described tenth of 16th diode (D6)
The cathode of five diodes (D5) connects, the cathode of the cathode and the 11st diode (D1) of the 16th diode (D6)
Connection, the anode of the 17th diode (D7) are connect with the anode of the 14th diode (D4), and the described 17th
The cathode of pole pipe (D7) is connect with the anode of the 13rd diode (D3), the tenth switching device (T1) and the described tenth
The common end of two switching devices (T3) and the 11st switching device (T2) and the 13rd switching device (T4) it is public
Hold the exchange side as the change of current subelement (11), the cathode and the 13rd diode of the 11st diode (D1)
(D3) DC side of the anode as the change of current subelement (11), the cathode of the 12nd diode (D2) and described
Another DC side of the anode of 14th diode (D4) as the change of current subelement (11).
5. ac-dc conversion circuit according to claim 4, which is characterized in that the change of current subelement (11) includes at least
One combination change of current sub-circuit；
The combination change of current sub-circuit is by first change of current sub-circuit, second change of current sub-circuit, third change of current
Circuit and any two in the 4th change of current sub-circuit or multiple combinations composition.
6. ac-dc conversion circuit according to claim 2, which is characterized in that further include at least one direct current capacitors,
With the output ends of the AC/DC converting units (14) or it is in series or in parallel after the AC/DC converting units (14) it is defeated
Outlet connects, and converts DC interface using the output end of the direct current capacitors as isolation.
7. ac-dc conversion circuit according to claim 1, which is characterized in that the change of current per phase cascade Connection is single
Total anode of first (11) is connected together as the anode of DC interface, the change of current subelement (11) per phase cascade Connection
Total cathode is connected together as the cathode of DC interface.
8. according to claim 1-7 any one of them ac-dc conversion circuits, which is characterized in that further include that the 2nd DC/AC turns
Unit is changed, conversion DC interface connection is isolated with described, and turn the output end of the 2nd DC/AC converting units as isolation
Change exchange interface.
9. a kind of electric power electric transformer, which is characterized in that including claim 1-8 any one of them ac-dc conversion electricity
Road.
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| CN107562985B (en) * | 2017-07-18 | 2020-11-13 | 全球能源互联网研究院有限公司 | Parameter determination and modeling method for coupling unit of alternating current-direct current conversion circuit |
| CN107565834B (en) | 2017-07-25 | 2020-03-24 | 全球能源互联网研究院有限公司 | Control method and device for alternating current-direct current conversion circuit |
| CN110034687A (en) * | 2019-04-18 | 2019-07-19 | 国网江苏省电力有限公司 | A kind of electric power electric transformer |
| CN111342680B (en) * | 2020-03-09 | 2021-11-02 | 西南交通大学 | Power electronic transformer applied to through power supply |
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