CN110022069A - A kind of the High Frequency Link bidirectional, dc transformer and its control method of two-way switch access - Google Patents
A kind of the High Frequency Link bidirectional, dc transformer and its control method of two-way switch access Download PDFInfo
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- CN110022069A CN110022069A CN201910142921.4A CN201910142921A CN110022069A CN 110022069 A CN110022069 A CN 110022069A CN 201910142921 A CN201910142921 A CN 201910142921A CN 110022069 A CN110022069 A CN 110022069A
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- high frequency
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- frequency link
- transformer
- way switch
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims abstract description 50
- 230000009466 transformation Effects 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims description 9
- LVTFSVIRYMXRSR-WUKNDPDISA-N 3-methyl-4'-dimethylaminoazobenzene Chemical compound C1=CC(N(C)C)=CC=C1\N=N\C1=CC=CC(C)=C1 LVTFSVIRYMXRSR-WUKNDPDISA-N 0.000 description 19
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
Abstract
The present invention relates to the High Frequency Link bidirectional, dc transformers and its control method of a kind of access of two-way switch, including one or more groups of High Frequency Link bidirectional, dc converter units, high voltage dc bus is accessed after the high-pressure side series connection of the multiple groups High Frequency Link bidirectional, dc converter unit, low-voltage direct bus is accessed after the low-pressure side of the multiple groups High Frequency Link bidirectional, dc converter unit is in parallel, the High Frequency Link bidirectional, dc converter unit includes high-frequency direct-current translation circuit, two-way switch and DC capacitor, two-way switch and DC capacitor series connection, the high-pressure side of High Frequency Link bidirectional, dc converter unit and low-pressure side difference two-way switch in parallel and DC capacitor branch.The present invention can be realized the matching work of High Frequency Link voltage, to improve the operational efficiency of commutator transformer by controlling high-pressure side two-way switch；And guarantee the steady operation of transformation work, improve the reliability of system.
Description
Technical field
The invention belongs to commutator transformer equipment technical field, in particular to a kind of High Frequency Link of two-way switch access is two-way
Commutator transformer and its control method.
Background technique
Currently, DC grid directly can not realize voltage transformation by magnetic-coupled mode, it is therefore necessary to based on electric power electricity
Sub- technology realizes the transformation of DC voltage and the bi-directional of power by commutator transformer.
In low pressure low capacity field, DC/DC converter has been obtained comparing and has been widely applied, for high-frequency isolation type DC/
DC converter (IBDC) also has more document to be inquired into.It is micro- that the DC/DC converter of these types can be used for low-voltage direct
The access of DC load, energy storage, distributed generation resource etc. in power grid can not but be used as high voltage direct current (HVDC) distribution and low-voltage direct
(LVDC) the energy conversion link between micro-capacitance sensor.
Use for reference the multiple technology thinking of DC/DC converter, document " the High Frequency Link direct current transformation for flexible direct current distribution
Device " inquire into the multiplex commutator transformer scheme based on double active full-bridges (DAB).The multiplex commutator transformer is mainly by n
A identical DAB converter unit composition, each DAB converter unit is by two full-bridges (H1 and H2), a high-frequency inductor
(L), a high frequency transformer (T), two DC capacitors (C1, C2) are constituted.N DAB connects in high-voltage end to access high straightening
Side is flowed, in low-pressure end parallel connection to access low-voltage direct side, so that high voltage direct current side voltage class be made to improve n times, makes low-voltage direct
Side current class improves n times.Such scheme is basic unit by using the DAB of high-frequency isolation, and commutator transformer is not only realized
The transformation of high-low pressure grade, also achieves the electrical isolation of high-low pressure DC bus and the two-way flow of power.Although such as
This when DC bus breaks down, can lead in the system-level of DC grid in application, since DC capacitor is centralized arrangement
It causes DC capacitor to discharge rapidly, generates biggish overcurrent；And after fault clearance, needs to recharge DC capacitor, make
The Dynamic- Recovery process of direct current system is slack-off.In addition, redundancy unit operation can not be set after DAB converter unit breaks down, it is no
It will cause DC capacitor short circuits, and after this is but also subelement breaks down, commutator transformer just wants out of service, reduce system
Reliability.
In addition to this, since the voltage at DAB medium/high frequency transformer both ends is two level high-frequency square waves.In energy transmission mistake
Cheng Zhong when both ends DC voltage and high frequency transformer no-load voltage ratio mismatch in the presence of very big circulation, and then leads to very big electric current
Stress and lower efficiency, this is also the technical bottleneck of current limitation DAB large-scale application.And based on double active full-bridges (DAB)
Multiplex commutator transformer scheme when carrying out system-level direct current networking, due to DC bus-bar voltage can exist fluctuation so that
Each subelement both ends DC voltage and high frequency transformer no-load voltage ratio mismatch, and reduce the operational efficiency of commutator transformer.
Summary of the invention
In view of the above-mentioned problems, the present invention provides High Frequency Link bidirectional, dc transformer and its control of a kind of access of two-way switch
Method, a kind of High Frequency Link bidirectional, dc transformer of two-way switch access include that one or more groups of High Frequency Link bidirectional, dcs transformation are single
Member accesses high voltage dc bus, the multiple groups high frequency after the high-pressure side series connection of the multiple groups High Frequency Link bidirectional, dc converter unit
Low-voltage direct bus is accessed after the low-pressure side of chain bidirectional, dc converter unit is in parallel,
The High Frequency Link bidirectional, dc converter unit includes high-frequency direct-current translation circuit, two-way switch and DC capacitor, double
To switch and DC capacitor series connection, the high-pressure side of High Frequency Link bidirectional, dc converter unit and low-pressure side respectively two-way switch in parallel and
DC capacitor branch.
Preferably, the two-way switch includes the first full control switch, and the collector of the first full control switch is separately connected first
The cathode of the cathode of diode and the second diode, the emitter of the first full control switch be separately connected third diode anode and
The anode of 4th diode draws first node, the two or two pole between the anode of first diode and the cathode of third diode
Second node is drawn between the anode of pipe and the cathode of the 4th diode.
Preferably, the two-way switch includes the first full control switch and the second full control switch, and the first full control switch is reversed simultaneously
Join first diode, second full control switch the second diode of reverse parallel connection, the control entirely of emitter connection second of the first full control switch
The emitter of switch, the collector of the first full control switch draw first node, and the collector of the second full control switch draws the second section
Point.
Preferably, the two-way switch includes the first branch and second branch, the collection that the first branch is switched by the first full control
The cathode of electrode series connection first diode is constituted, the collector that control switchs entirely of cathode connection first of third diode, and the three or two
The full emitter for controlling switch of anode connection first of pole pipe, the two or two pole of emitter series connection that second branch is switched by the second full control
The anode of pipe is constituted, the collector of the control switch entirely of the cathode of the 4th diode connection second, the anode connection of the 4th diode the
The emitter of two full control switches draws first node between the first full control switch emitter and the collector of the second full control switch,
Second node is drawn between first diode anode and the cathode of the second diode.
Preferably, the high-frequency direct-current translation circuit include high-pressure side full-bridge circuit, high-frequency inductor, high frequency transformer and
Low-pressure side full-bridge circuit, high-pressure side full-bridge circuit access the primary side winding of high frequency transformer, low-pressure side full-bridge by high-frequency inductor
The vice-side winding of circuit access high frequency transformer.
A kind of control method of the High Frequency Link bidirectional, dc transformer of two-way switch access, comprising:
When working properly, the two-way switch of all converter unit low-pressure sides is constantly on, two-way by control high-pressure side
Switch turns on and off, and realizes bidirectional, dc transformer function, while keeping the matching of High Frequency Link voltage, reduces direct current transformation
The circulation of device；
When internal fault occurs for certain High Frequency Link bidirectional, dc converter unit, by turning off the converter unit high-pressure side and low
The two-way switch of side is pressed, and bypasses the transformation of the failure using the high-pressure side full-bridge circuit of external bypass switch or the converter unit
Unit realizes the redundancy running of High Frequency Link bidirectional, dc transformer；
When external fault occurs for High Frequency Link bidirectional, dc transformer, by turning off all converter unit high-pressure sides and low pressure
The two-way switch of side, isolated DC short trouble, while DC capacitor voltage is kept, after fault clearance, realize that High Frequency Link is double
To quickly resuming operation for commutator transformer.
Preferably, the external fault includes DC bus short trouble and overvoltage failure.
Preferably, the DC bus fault includes high voltage dc bus failure and low-voltage direct bus-bar fault.
The beneficial effects of the present invention are pass through the high-pressure side of the High Frequency Link bidirectional, dc transformer accessed to two-way switch
Two-way switch is controlled, and can be realized the matching work of High Frequency Link voltage, to improve the operational efficiency of commutator transformer；
Two-way switch access High Frequency Link bidirectional, dc transformer occur internal fault when, using external bypass switch or
The switching tube of the high-pressure side full-bridge circuit of the High Frequency Link bidirectional, dc converter unit does not need to stop high frequency as bypass submodule
Commutator transformer guarantees the steady operation of high-frequency direct-current transformer, improves the reliability of system；
When external fault occurs, by turning off the high-pressure side two-way switch of the High Frequency Link bidirectional, dc converter unit and low
Side two-way switch, isolated DC short trouble, and holding capacitor voltage are pressed, does not need to charge to capacitor again, thus side
Just the fast quick-recovery of system.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by specification, right
Pointed structure is achieved and obtained in claim and attached drawing.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 shows the topological structure schematic diagram of the High Frequency Link bidirectional, dc transformer of two-way switch access of the invention；
Fig. 2 shows the topological structure schematic diagrames of the two-way switch of the first embodiment of the invention；
Fig. 3 shows the topological structure schematic diagram of the two-way switch of second of embodiment of the invention；
Fig. 4 outputs the topological structure schematic diagram of the two-way switch of the third embodiment of the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical solution in the embodiment of the present invention clearly and completely illustrated, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
It will also be understood that when element be referred to as another element " between ", " being connected to " or " being integrated to " another element
When, the element can directly between another element, be directly connected to or be integrated to another element, or may exist cental element
Part.On the contrary, when element be referred to as " direct " another element " between ", direct " being connected to " or " being integrated to " another element
When, intermediary element is not present.
The present invention provides a kind of High Frequency Link bidirectional, dc transformer of two-way switch access and its control method, Fig. 1 are shown
A kind of topological structure schematic diagram of the High Frequency Link bidirectional, dc transformer of two-way switch access.A kind of height of two-way switch access
Frequency chain bidirectional, dc transformer includes N number of High Frequency Link bidirectional, dc converter unit MDAB: High Frequency Link bidirectional, dc converter unit
MDAB1, High Frequency Link bidirectional, dc converter unit MDABi, High Frequency Link bidirectional, dc converter unit MDABN, N
For any positive integer, i is greater than 1 and to be less than or equal to any positive integer of N, and N number of High Frequency Link bidirectional, dc converter unit
Series/parallel high voltage dc bus, the low-voltage direct side series/parallel low-voltage direct bus of MDAB.For example high pressure can be used
DC side series connection input, the form of low-voltage direct side parallel output, High Frequency Link bidirectional, dc converter unit MDAB's N number of in this way is defeated
Enter the sum of end and is equal to MVDC (high voltage direct current side) port voltage；N number of High Frequency Link bidirectional, dc converter unit MDAB output end voltage
Mean value be equal to LVDC (low-voltage direct side) voltage.It is of course also possible to use high voltage direct current side series connection-low-voltage direct side string
Connection, high voltage direct current side parallel connection-low-voltage direct side parallel connection and high voltage direct current side parallel connection-concatenated structure in low-voltage direct side.Flexibly
With the number of High Frequency Link bidirectional, dc converter unit MDAB, the pressure resistance and through-current capability of turn-off device are reasonably selected, can be set
Count out the DC converter for different voltages grade transformation application.
For ease of description, only by high voltage direct current side, series connection is inputted, for the applicable cases of low-voltage direct side parallel output, into
Row explanation.The case where may be equally applicable for the output of high voltage direct current side, the input of low-voltage direct side.
Illustratively, the 1st High Frequency Link bidirectional, dc converter unit MDAB1 high voltage direct current side passes through the first connection terminal T1
Inductance L1 is connected, is connected by inductance L1 with the anode of high voltage dc bus.(i-1)-th High Frequency Link bidirectional, dc converter unit
The high voltage direct current of the sub- T2 and i-th High Frequency Link bidirectional, dc converter unit MDABi of the high voltage direct current side second connection end of MDABi-1
Side the first connection terminal T1 is connected；High voltage direct current side second connection end of N platform High Frequency Link bidirectional, dc converter unit MDABN
It is connected with the cathode of high voltage dc bus；The low-voltage direct side of 1-N platform High Frequency Link bidirectional, dc converter unit MDAB passes through the
Three connection terminal T3 and the 4th connection terminal T4 parallel connection low-voltage direct bus.
High Frequency Link bidirectional, dc converter unit MDAB include be connected on the first connection terminal T1 and sub- T2 of second connection end it
Between the first two-way switch Q1 and DC capacitor C1.First connection terminal T1 is connected to two-way switch Q1, two-way switch Q1 connection
To the anode of DC capacitor C1, the cathode of DC capacitor C1 is connected to the sub- T2 of second connection end.Two-way switch Q1 and DC capacitor
The positive and negative anodes of common input side full-bridge circuit in parallel, the first bridge arm midpoint P1 of input side full-bridge circuit and the second bridge after C1 series connection
The primary side winding of arm midpoint P2 access high frequency transformer T.The the first bridge arm midpoint P1 and high frequency transformer T of input side full-bridge circuit
Primary side winding between connect high-frequency inductor L, the vice-side winding of high frequency transformer T connects outlet side full-bridge circuit, and outlet side is complete
The the first bridge arm midpoint P3 and the second bridge arm midpoint P4 of bridge circuit access high frequency transformer T.The anode of outlet side full-bridge circuit is even
Be connected to third connection terminal T3, cathode be connected to the 4th connection terminal T4, third connection terminal T3 and the 4th connection terminal T4 it
Between connect the second two-way switch Q2 and DC capacitor C2.
Input side full-bridge circuit and outlet side full-bridge circuit are all made of the construction of switch of full control switch anti-parallel diodes
Full bridge structure as bridge arm.Specifically, the first bridge arm of input side full-bridge circuit includes full control switch and two pole of reverse parallel connection
Bridge arm on the first of the composition of pipe combination S 1, and the first lower bridge arm of full control switch and the composition of anti-parallel diodes combination S 2；
The second bridge arm of input full-bridge circuit H1 includes that full control switchs bridge arm on second constituted with anti-parallel diodes combination S 3, with
And the second lower bridge arm that full control switch and anti-parallel diodes combination S 4 are constituted；On the first of input side full-bridge circuit bridge arm and
The connection midpoint P1 extraction of first lower bridge arm is connected to high-frequency inductor L, passes through the of high-frequency inductor L and input side full-bridge circuit
Bridge arm and the connection midpoint P2 of the second lower bridge arm extraction are commonly connected to high frequency transformer T primary side winding both ends on two.
First bridge arm of outlet side full-bridge circuit includes the first of full control switch and the composition of anti-parallel diodes combination S 5
Upper bridge arm, and the first lower bridge arm that full control switch and anti-parallel diodes combination S 6 are constituted；The of outlet side full-bridge circuit
Two bridge arms include full control switch and anti-parallel diodes combination S 7 is constituted bridge arm on second, and full control switch and it is reversed simultaneously
The second lower bridge arm that union II pole pipe combination S 8 is constituted.On the first of outlet side full-bridge circuit in the connection of bridge arm and the first lower bridge arm
Point P3 extraction is connected to high-frequency inductor L, passes through bridge arm and the second lower bridge on the second of high-frequency inductor L and outlet side full-bridge circuit
The connection midpoint P4 extraction of arm is commonly connected to high frequency transformer T vice-side winding both ends.
As the first embodiment of the invention, as shown in Fig. 2, two-way switch Q1 and two-way switch Q2 is 1 full control
The two-way switch that switch and 4 diodes are constituted.Specifically, the collector of the first full control switch S11 of two-way switch connects the
The emitter of the cathode of one diode D1 and the second diode D2, the first full control switch S11 connects third diode D3 and the 4th
The anode of diode D4, the anode of first diode D1 and the cathode of third diode D3 access first node 1, the second diode
The anode of D2 and the cathode of the 4th diode D4 access second node 2.
Illustratively, pass through first node 1 and direct current in the high voltage direct current side of High Frequency Link bidirectional, dc converter unit MDAB
The anode of capacitor C1 is attached, and is attached by second node 2 and high voltage direct current side the first connection terminal T1, and in high frequency
The low-voltage direct side of chain bidirectional, dc converter unit MDAB is attached by first node 1 and the anode of DC capacitor C2, is led to
Second node 2 and low-voltage direct side third connection terminal T3 is crossed to be attached.
As second of embodiment of the invention, as shown in figure 3, two-way switch Q1 and two-way switch Q2 is 2 full controls
The two-way switch that switch and 2 diodes are constituted.Specifically, control switchs the full control switch S11 and first of the first of two-way switch entirely
S12 carries out differential concatenation, and the emitter of the first full control switch S11 and the emitter of the second full control switch S12 are attached, and first
Full control switch S11 reverse parallel connection first diode D1, second full control the second diode of switch S12 reverse parallel connection D2.First full control
The collector of switch S11 draws first node 1, and the collector of the second full control switch S12 draws second node 2.
Illustratively, pass through first node 1 and direct current in the high voltage direct current side of High Frequency Link bidirectional, dc converter unit MDAB
The anode of capacitor C1 is attached, and is attached by second node 2 and high voltage direct current side the first connection terminal T1, and in high frequency
The low-voltage direct side of chain bidirectional, dc converter unit MDAB is attached by first node 1 and the anode of DC capacitor C2, is led to
Second node 2 and low-voltage direct side third connection terminal T3 is crossed to be attached.
As the third embodiment of the invention, as shown in figure 4, two-way switch Q1 and two-way switch Q2 pass through two
Branch is constituted, and two branches pass through a full control switch and a Diode series are constituted, and full control switch reverse parallel connection two
Pole pipe.Specifically, the two-way switch includes the first branch and second branch, the first branch is by the first full collection for controlling switch S11
The cathode of electrode series connection first diode D1 is constituted, and the collector of switch S11 is controlled in the cathode connection first of third diode D3 entirely,
The emitter of switch S11 is controlled in the positive connection first of third diode D3 entirely, and second branch is by the second full transmitting for controlling switch S12
The anode of the second diode D2 of pole series connection is constituted, and the collector of switch S12 is controlled in the cathode connection second of the 4th diode D3 entirely, the
The emitter of switch S12 is controlled in the anode connection second of four diode D3 entirely, and the first full control switch S11 emitter is opened with the second full control
It closes and draws first node between the collector of S12, the is drawn between first diode D1 anode and the cathode of the second diode D2
Two nodes.
Illustratively, pass through first node 1 and direct current in the high voltage direct current side of High Frequency Link bidirectional, dc converter unit MDAB
The anode of capacitor C1 is attached, and is attached by second node 2 and high voltage direct current side the first connection terminal T1, and in high frequency
The low-voltage direct side of chain bidirectional, dc converter unit MDAB is attached by first node 1 and the anode of DC capacitor C2, is led to
Second node 2 and low-voltage direct side third connection terminal T3 is crossed to be attached.
A kind of control method of the High Frequency Link bidirectional, dc transformer of two-way switch access, comprising:
1) when normal condition, the two-way switch Q2 of all converter units is constantly on, passes through control two-way switch Q1's
It turns on and off, the matching of High Frequency Link voltage can be always maintained at, to reduce the circulation of commutator transformer.Q1 turns off duty ratio
Calculation formula is as follows:
V in formula1And V2Respectively the input side of bidirectional, dc converter unit and outlet side DC voltage, n are high frequency transformer
Physics no-load voltage ratio, D1It is simultaneously turned on for the first two-way switch Q1 all full control switch for turning off duty ratio and input side full-bridge
Duty ratio.
2) when internal fault occurs for bidirectional, dc converter unit, by turning off the two-way switch Q1 of the trouble unit and double
The converter unit of the failure is bypassed to switch Q2, and using the high-pressure side full-bridge circuit of external bypass switch or the converter unit,
The redundancy running that High Frequency Link bidirectional, dc transformer may be implemented improves the reliability of system.
3) when DC bus short trouble occurs, by the two-way switch Q1 and two-way switch that turn off all converter units
Q2, isolated DC short trouble can prevent DC capacitor repid discharge, to be conducive to after fault clearance, High Frequency Link is double
To quickly resuming operation for commutator transformer.
4) when DC bus overvoltage failure occurs, by the two-way switch Q1 and two-way opened that turn off all converter units
Q2 is closed, isolated DC overvoltage failure can prevent DC capacitor quick charge, to be conducive to after fault clearance, high frequency
Chain bidirectional, dc transformer quickly resumes operation.
Illustratively, switching tube Q1 and Q2 is the two-way switch that 1 full control switch and 4 diodes are constituted.Two-way opened
The cathode of collector connection the first diode D1 and the second diode D2 of the full control switch S11 of first closed, the first full control switch
The anode of emitter connection the third diode D3 and the 4th diode D4 of S11, the anode of first diode D1 and the three or two pole
The cathode of pipe D3 accesses first node 1, and the anode of the second diode D2 and the cathode of the 4th diode D4 access second node 2.
Connected in the high voltage direct current side of High Frequency Link bidirectional, dc converter unit MDAB by first node 1 and the anode of DC capacitor C1
It connects, is attached by second node 2 and high voltage direct current side the first connection terminal T1, and in High Frequency Link bidirectional, dc converter unit
The low-voltage direct side of MDAB is attached by first node 1 and the anode of DC capacitor C2, passes through second node 2 and low-pressure direct
Stream side third connection terminal T3 is attached.
1) when working properly, the two-way switch Q2 conducting of all converter units, control two-way switch Q1's opening and closing
It is disconnected, it can be always maintained at the matching of High Frequency Link voltage, to reduce the circulation of commutator transformer；That is, all converter units is double
Switch S11 conducting is controlled entirely to the first of switch Q2, and the first full control switch S11's of control two-way switch Q1 opening and closing, can
To be always maintained at the matching of High Frequency Link voltage, to reduce the circulation of commutator transformer.
2) when the internal fault of DC converting unit occurs, the two-way switch Q1 and two-way switch Q2 of the trouble unit are closed
Break, and bypasses the converter unit of the failure, Ke Yishi using the high-pressure side full-bridge circuit of external bypass switch or the converter unit
The redundancy running of existing High Frequency Link bidirectional, dc transformer, improves the reliability of system；That is, the two-way switch Q1 of the trouble unit
The first full control switch S11 shutdown of first full control switch S11 and two-way switch Q2, uses external bypass switch or switching tube
S1, S2, S3, S4 are as bypass submodule.
3) when DC bus short trouble occurs, the two-way switch Q1 and two-way switch Q2 of all converter units are turned off,
Isolated DC short trouble can prevent DC capacitor repid discharge, thus after being conducive to fault clearance, High Frequency Link bidirectional, dc
Transformer quickly resumes operation；That is, the full control switch S11 and two-way switch Q2 of the first of the two-way switch Q1 of all converter units
The first full control switch S11 turn off, isolated DC short trouble, the voltage of holding capacitor C1.
4) when DC bus overvoltage failure occurs, the two-way switch Q1 and two-way switch Q2 of all converter units are closed
Disconnected, isolated DC overvoltage failure can prevent DC capacitor quick charge, so that High Frequency Link is two-way straight after fault clearance
Convertor transformer quickly resumes operation；That is, the full control switch S11 of the first of the two-way switch Q1 of all converter units and two-way switch
The full control switch S11 shutdown of the first of Q2, isolated DC short trouble, the voltage of holding capacitor C1.
Illustratively, two-way switch Q1 and two-way switch Q2 is 2 full controls and the two-way switch that 2 diodes are constituted.It is double
The control switch S12 differential concatenation entirely of switch S11 and first is controlled entirely to the first of switch, and first controls the emitter and the of switch S11 entirely
The emitter of two full control switch S12 is attached, and the first full control switch S11 reverse parallel connection first diode D1, the second full control is opened
Close the second diode of S12 reverse parallel connection D2.The collector of first full control switch S11 draws first node 1, the second full control switch
The collector of S12 draws second node 2.Pass through first node in the high voltage direct current side of High Frequency Link bidirectional, dc converter unit MDAB
1 is attached with the anode of DC capacitor C1, is attached by second node 2 and high voltage direct current side the first connection terminal T1,
And it is carried out in the low-voltage direct side of High Frequency Link bidirectional, dc converter unit MDAB by the anode of first node 1 and DC capacitor C2
Connection, is attached by second node 2 and low-voltage direct side third connection terminal T3.
1) when working properly, the two-way switch Q2 conducting of all converter units, control two-way switch Q1's opening and closing
It is disconnected, it can be always maintained at the matching of High Frequency Link voltage, to reduce the circulation of commutator transformer；That is, all converter units is double
The the second full control switch S12 for controlling switch S11 and two-way switch Q2 entirely to the first of switch Q2 is both turned on, and controls two-way switch Q1
The first full control switch S11 opening and closing, and control two-way switch Q1 second controls switch S12 entirely, can protect always
The matching of High Frequency Link voltage is held, to reduce the circulation of commutator transformer.
2) when the internal fault of DC converting unit occurs, the two-way switch Q1 and two-way switch of the fault conversion unit
Q2 is turned off, and the converter unit of the failure is bypassed using the high-pressure side full-bridge circuit of external bypass switch or the converter unit, can
To realize the redundancy running of High Frequency Link bidirectional, dc transformer, the reliability of system is improved；That is, the fault conversion unit is two-way
The full control switch S11 and second of the first of switch Q1 controls the first full control switch S11 and second of switch S12 and two-way switch Q2 entirely
Full control switch S12 is turned off, and uses external bypass switch or switching tube S1, S2, S3, S4 as bypass submodule.
3) when DC bus short trouble occurs, the two-way switch Q1 and two-way switch Q2 of all converter units are turned off,
Isolated DC short trouble can prevent DC capacitor repid discharge, thus after being conducive to fault clearance, High Frequency Link bidirectional, dc
Transformer quickly resumes operation；That is, the full control switch S11 and second of the first of the two-way switch Q1 of all converter units entirely open by control
The the first full control switch S11 and second for closing S12 and two-way switch Q2 is controlled switch S12 entirely and is turned off, isolated DC short trouble,
The voltage of holding capacitor C1.
4) when DC bus overvoltage failure occurs, the two-way switch Q1 and two-way switch Q2 of all converter units are closed
Disconnected, isolated DC overvoltage failure can prevent DC capacitor quick charge, so that High Frequency Link is double after being conducive to fault clearance
To quickly resuming operation for commutator transformer；That is, the full control switch S11 and second of the first of the two-way switch Q1 of all converter units
Control switch S12 is turned off the full control switch S11 and second of the first of full control switch S12 and two-way switch Q2 entirely, and isolated DC is short
Road failure, the voltage of holding capacitor C1.
Illustratively, two-way switch Q1 and two-way switch Q2 passes through two branches and constitutes, and two branches pass through one
Full control switch and a Diode series are constituted, and full control switch anti-parallel diodes.Specifically, a branch of two-way switch
Road passes through the cathode composition that the collector that first controls switch S11 entirely connects first diode D1, and first controls switch S11 reversely simultaneously entirely
Join the second diode D2, another branch of two-way switch connects third diode by the emitter of the second full control switch S12
The anode of D3 is constituted, the second full control the 4th diode D4 of switch S12 reverse parallel connection, draws 1 He of first node between two branches
Second node 2.Pass through first node 1 and DC capacitor C1's in the high voltage direct current side of High Frequency Link bidirectional, dc converter unit MDAB
Anode is attached, and is attached by second node 2 and high voltage direct current side the first connection terminal T1, and two-way straight in High Frequency Link
The low-voltage direct side of stream converter unit MDAB is attached by first node 1 and the anode of DC capacitor C2, passes through the second section
Point 2 is attached with low-voltage direct side third connection terminal T3.
1) when working properly, the two-way switch Q2 conducting of all converter units, control two-way switch Q1's opening and closing
It is disconnected, it can be always maintained at the matching of High Frequency Link voltage, to reduce the circulation of commutator transformer；That is, all converter units is double
The the second full control switch S12 for controlling switch S11 and two-way switch Q2 entirely to the first of switch Q2 is both turned on, and controls two-way switch Q1
The first full control switch S11 opening and closing, and control two-way switch Q1 second controls switch S12 entirely, can protect always
The matching of High Frequency Link voltage is held, to reduce the circulation of commutator transformer.
2) when the internal fault of DC converting unit occurs, the two-way switch Q1 and two-way switch of the fault conversion unit
Q2 is turned off, and the converter unit of the failure is bypassed using the high-pressure side full-bridge circuit of external bypass switch or the converter unit, can
To realize the redundancy running of High Frequency Link bidirectional, dc transformer, the reliability of system is improved；That is, the fault conversion unit is two-way
The full control switch S11 and second of the first of switch Q1 controls the first full control switch S11 and second of switch S12 and two-way switch Q2 entirely
Full control switch S12 is turned off, and uses external bypass switch or switching tube S1, S2, S3, S4 as bypass submodule.
3) when DC bus short trouble occurs, the two-way switch Q1 and two-way switch Q2 of all converter units are turned off,
Isolated DC short trouble can prevent DC capacitor repid discharge, thus after being conducive to fault clearance, High Frequency Link bidirectional, dc
Transformer quickly resumes operation；That is, the full control switch S11 and second of the first of the two-way switch Q1 of all converter units entirely open by control
The the first full control switch S11 and second for closing S12 and two-way switch Q2 is controlled switch S12 entirely and is turned off, isolated DC short trouble,
The voltage of holding capacitor C1.
4) when DC bus overvoltage failure occurs, the two-way switch Q1 and two-way switch Q2 of all converter units are closed
Disconnected, isolated DC overvoltage failure can prevent DC capacitor quick charge, so that High Frequency Link is double after being conducive to fault clearance
To quickly resuming operation for commutator transformer；That is, the full control switch S11 and second of the first of the two-way switch Q1 of all converter units
Control switch S12 is turned off the full control switch S11 and second of the first of full control switch S12 and two-way switch Q2 entirely, and isolated DC is short
Road failure, the voltage of holding capacitor C1.
The technical program, by the high-pressure side two-way switch of the High Frequency Link bidirectional, dc transformer that two-way switch is accessed into
Row control, realizes the matching work of High Frequency Link voltage, to improve the operational efficiency of commutator transformer；
Two-way switch access High Frequency Link bidirectional, dc transformer occur internal fault when, using external bypass switch or
The switching tube of the high-pressure side full-bridge circuit of the High Frequency Link bidirectional, dc converter unit does not need to stop high frequency as bypass submodule
Commutator transformer guarantees the steady operation of high-frequency direct-current transformer, improves the reliability of system；
When external fault occurs, by turning off the high-pressure side two-way switch of the High Frequency Link bidirectional, dc converter unit and low
Side two-way switch, isolated DC short trouble, and holding capacitor voltage are pressed, does not need to charge to capacitor again, thus side
Just the fast quick-recovery of system.
Although the present invention is described in detail referring to the foregoing embodiments, those skilled in the art should manage
Solution: it is still possible to modify the technical solutions described in the foregoing embodiments, or to part of technical characteristic into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The spirit and scope of scheme.
Claims (8)
1. a kind of High Frequency Link bidirectional, dc transformer of two-way switch access, including the transformation of one or more groups of High Frequency Link bidirectional, dcs
Unit accesses high voltage dc bus after the high-pressure side series connection of the multiple groups High Frequency Link bidirectional, dc converter unit, and the multiple groups are high
Low-voltage direct bus is accessed after the low-pressure side of frequency chain bidirectional, dc converter unit is in parallel, which is characterized in that
The High Frequency Link bidirectional, dc converter unit includes high-frequency direct-current translation circuit, two-way switch and DC capacitor, two-way opened
It closes and DC capacitor series connection, the high-pressure side of High Frequency Link bidirectional, dc converter unit and low-pressure side difference two-way switch in parallel and direct current
Capacitive branch.
2. the High Frequency Link bidirectional, dc transformer of two-way switch access according to claim 1, which is characterized in that described double
It include the first full control switch to switch；The collector of first full control switch is separately connected cathode and the two or two pole of first diode
The cathode of pipe；The emitter of first full control switch is separately connected the anode of third diode and the anode of the 4th diode；First
First node is drawn between the anode of diode and the cathode of third diode；The anode of second diode and the 4th diode
Second node is drawn between cathode.
3. the High Frequency Link bidirectional, dc transformer of two-way switch access according to claim 1, which is characterized in that described double
It include the first full control switch and the second full control switch, the first full control switch reverse parallel connection first diode, the second full control to switch
Switch the second diode of reverse parallel connection, the first full emitter that control switchs entirely of emitter connection second for controlling switch, the first full control
The collector of switch draws first node, and the collector of the second full control switch draws second node.
4. the High Frequency Link bidirectional, dc transformer of two-way switch access according to claim 1, which is characterized in that described double
It include the first branch and second branch to switch, the first branch is negative by the first full collector series connection first diode for controlling switch
Pole is constituted, the collector that control switchs entirely of cathode connection first of third diode, the control entirely of anode connection first of third diode
The emitter of switch, second branch are made of the anode of emitter the second diode of series connection of the second full control switch, the four or two pole
The collector that control switchs entirely of cathode connection second of pipe, the emitter that control switchs entirely of anode connection second of the 4th diode, the
First node, first diode anode and the two or two are drawn between one full control switch emitter and the collector of the second full control switch
Second node is drawn between the cathode of pole pipe.
5. the High Frequency Link bidirectional, dc transformer of two-way switch access according to claim 1, which is characterized in that the height
Frequency DC transfer circuit includes high-pressure side full-bridge circuit, high-frequency inductor, high frequency transformer and low-pressure side full-bridge circuit, high-pressure side
Full-bridge circuit accesses the primary side winding of high frequency transformer by high-frequency inductor, and low-pressure side full-bridge circuit accesses the pair of high frequency transformer
Side winding.
6. a kind of control method of the High Frequency Link bidirectional, dc transformer of two-way switch access characterized by comprising
When working properly, the two-way switch of all converter unit low-pressure sides is constantly on, by controlling high-pressure side two-way switch
Turn on and off, realize bidirectional, dc transformer function, while keeping the matching of High Frequency Link voltage, reduce commutator transformer
Circulation；
When internal fault occurs for certain High Frequency Link bidirectional, dc converter unit, by turning off the converter unit high-pressure side and low-pressure side
Two-way switch, and bypass the transformation list of the failure using the high-pressure side full-bridge circuit of external bypass switch or the converter unit
Member realizes the redundancy running of High Frequency Link bidirectional, dc transformer；
When external fault occurs for High Frequency Link bidirectional, dc transformer, by turning off all converter unit high-pressure sides and low-pressure side
Two-way switch, isolated DC short trouble, while DC capacitor voltage is kept, after fault clearance, realize that High Frequency Link is two-way straight
Convertor transformer quickly resumes operation.
7. the control method of the High Frequency Link bidirectional, dc transformer of two-way switch access according to claim 6, feature
It is, the external fault includes DC bus short trouble and overvoltage failure.
8. the control method of the High Frequency Link bidirectional, dc transformer of two-way switch access according to claim 7, feature
It is, the DC bus fault includes high voltage dc bus failure and low-voltage direct bus-bar fault.
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| CN201910142921.4A CN110022069A (en) | 2019-02-26 | 2019-02-26 | A kind of the High Frequency Link bidirectional, dc transformer and its control method of two-way switch access |
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