CN207475408U - A kind of high-voltage large-capacity commutator transformer - Google Patents
A kind of high-voltage large-capacity commutator transformer Download PDFInfo
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Abstract
A kind of high-voltage large-capacity commutator transformer provided by the utility model includes the modularization DC DC units of n identical input terminal series connection output terminal series connection, and wherein n is arbitrary positive integer；DC DC units include sequentially connected input side interface circuit, input lateral capacitance, ITVDC converter unit, output lateral capacitance and outlet side interface circuit；Input side interface circuit and outlet side interface circuit are matched respectively with the transformer voltage ratio in ITVDC converter unit always by the DC voltage that switching tube conducting state is controlled to adjust input lateral capacitance and output lateral capacitance.The utility model ensures failure bypass by the way that transformer both ends DC voltage is made to be matched always with transformer voltage ratio, can effectively improve the efficiency and reliability of high-voltage large-capacity commutator transformer.
Description
Technical field
The utility model belongs to technical field of electric power, is related to solid-state transformer more particularly to suitable for large capacity high pressure
The high-voltage large-capacity commutator transformer of direct current transportation (abbreviation HVDC).
Background technology
In order to realize DC distribution net is high, middle straightening stream distribution bus and low-voltage direct micro-capacitance sensor busbar or it is various it is different directly
The connection of the load of voltage class, energy-storage system and distributed power generation is flowed, commutator transformer is widely studied.
For large capacity D.C. high voltage transmission (abbreviation HVDC) transmission system, due to being by different regional high voltage direct current
Power grid is formed, and the voltage class of these different high-voltage direct current power grids is also likely to be present difference, it is therefore desirable to pass through high pressure DC-
DC converters interconnect the high-voltage direct current power grid of different voltages grade, to realize the Power Exchange of high-voltage direct current power grid and trend control
System.But existing high pressure DC-DC converter fluctuates so that both ends direct current in energy transmission since DC bus-bar voltage exists
Voltage is mismatched with transformer, leads to larger circulation, and then very big current stress occur so that high pressure DC-DC converter
Efficiency reduces.In addition, dc bus break down or high pressure DC-DC converter inside subelement break down when will be to whole
The input-output characteristic of a high pressure DC-DC converter has an impact or even damages, and causes system out of service, reliability
It is poor.
Utility model content
In view of this, the utility model provides a kind of high-voltage large-capacity direct current suitable for large capacity D.C. high voltage transmission and becomes
Depressor by the way that transformer both ends DC voltage is made to be matched always with transformer voltage ratio, and ensures failure bypass, can effectively improve
The efficiency and reliability of high-voltage large-capacity commutator transformer.
In order to achieve the above objectives, the technical solution of the utility model is as follows：
A kind of high-voltage large-capacity commutator transformer includes the modularization DC- of n identical input terminal series connection output terminal series connection
DC units, wherein n are arbitrary positive integer；DC-DC units include sequentially connected input side interface circuit, input lateral capacitance, is straight
Current converter unit, output lateral capacitance and outlet side interface circuit；Input side interface circuit and outlet side interface circuit lead to respectively
Cross control switching tube conducting state adjust the DC voltage of input lateral capacitance and output lateral capacitance always with ITVDC converter unit
In transformer voltage ratio matching.
Further, input side limiting circuit is serially connected between input side interface circuit and input lateral capacitance, exports side interface
Outlet side limiting circuit is serially connected between circuit and output lateral capacitance, input side limiting circuit and outlet side limiting circuit are respectively used to
The climbing of voltage and current during limitation input side interface circuit and outlet side interface circuit switching tube turn on and off.
Further, input side limiting circuit and input side limiting circuit include buffering capacitance and buffering reactance, buffering
Capacitance is connected to the respective side interface circuit connecting side of buffering reactance by diode；The anode of capacitance is buffered also by buffering electricity
Resistance is connected to the respective side capacitance cathode connecting side of buffering reactance；The cathode of buffering capacitance is connected with corresponding lateral capacitance cathode.
Further, input side interface circuit and outlet side interface circuit include the first switch pipe being serially connected and the
Two switching tubes, input side interface circuit and outlet side interface circuit the first switch pipe and second switch by being connected in turn respectively
Pipe, the pulse voltage for being D in input side and outlet side difference output duty cycle.
Further, first switch pipe collector is connected with respective side capacitance cathode, second switch pipe emitter with it is corresponding
Lateral capacitance cathode is connected, and reverse parallel connection has diode respectively for first switch pipe, second switch pipe.
Further, in the modularization DC-DC units of n identical input terminal series connection output terminal series connection, the first DC-DC is mono-
First connection terminal of member passes through the direct current reactance, first switch device, second switch device and the input side high pressure that are serially connected
The anode in source is connected；The third connection terminal of first DC-DC units by the direct current reactance that is serially connected, first switch device,
Second switch device is connected with the anode of outlet side high-voltage power supply；Second switch device is parallel with delay startup resistance, second switch device
Part is by switching open and close control delay startup resistance access circuit.
Further, in the modularization DC-DC units of n identical input terminal series connection output terminal series connection, m+1 platforms DC-
The first connection terminal, the third connection terminal of DC units are connect respectively with the second connection end of m platform DC-DC units, the 4th
Terminal is connected, 1≤m<n；Second connection end of n-th DC-DC unit is connected with inputting the cathode of high-voltage power supply, the 4th connecting pin
Sub- T4It is connected with the cathode for exporting high-voltage power supply
Further, ITVDC converter unit includes sequentially connected input circuit, isolating transformer and output circuit, institute
It states input full-bridge circuit and exports full-bridge circuit using H of the construction of switch of switching device anti-parallel diodes as bridge arm
Full bridge structure or half-bridge structure.
Further, in the modularization DC-DC units of n identical input terminal series connection output terminal series connection, adjacent DC-DC is mono-
There is 120 degree of phase shifting angle between the pulse voltage that member is exported in same side ports.
The beneficial effects of the utility model are：
(1) switching tube in high-voltage large-capacity commutator transformer interface circuit provided by the utility model is operated in PWM
State can realize the adjusting of input lateral capacitance and outlet side capacitor direct current voltage so that input lateral capacitance and output lateral capacitance
DC voltage matched always with ITVDC converter unit isolating transformer no-load voltage ratio, so as to highest efficiency.
(2) there is 120 degree of phase shifting angle between the pulse voltage that adjacent DC-DC units are exported in same side ports, so as to
So that the switching frequency of input or output series connection end output voltage is n times of each input interface unit output voltage, so as to
To reduce the current ripples of input HVDC ports.
(3) it when a certain DC-DC units break down, is disconnected and is closed by switching tube, by failure DC-DC units
Road；When short trouble occurs in HVDC ports 1 or HVDC ports 2, all DC-DC unit switch pipes disconnect；So as to effectively carry
The reliability of high high-voltage large-capacity commutator transformer.
Description of the drawings
By referring to the drawings to the description of the utility model embodiment, the above-mentioned and other mesh of the utility model
, feature and advantage will be apparent from, in the accompanying drawings：
Fig. 1 is high-voltage large-capacity commutator transformer topology diagram provided by the utility model；
Fig. 2 is high-voltage large-capacity commutator transformer ideal operation waveform provided by the utility model；
Fig. 3 is half-bridge structure commutator transformer unit provided by the utility model.
Specific embodiment
The utility model is described below based on embodiment, but the utility model is not restricted to these implementations
Example.
Example embodiment is described more fully with now with reference to attached drawing；However, example embodiment can be in different forms
It is implemented and should not be construed as being limited to the embodiment illustrated herein.On the contrary, these embodiments are provided to enable this public affairs
It is comprehensive and complete to open, and will fully convey illustrative embodiments to those skilled in the art.Identical label
Always show identical element.
It will also be understood that when an element be referred to as another element " between ", " being connected to " or " being attached to " another element
When, the element can directly between another element, be directly connected to or be attached to another element or there may be cental element
Part.On the contrary, when an element be referred to as " direct " another element " between ", direct " being connected to " or " being attached to " another element
When, there is no intermediary elements.
As shown in Figure 1, a kind of high-voltage large-capacity commutator transformer provided by the utility model, be serially connected in HVDC ports 1 with
Between HVDC ports 2, high-voltage large-capacity DC converting and power transmission are used to implement, it is mono- including n identical modular DC-DC
Member：DC-DC units 1, DC-DC units 2 ... submodule unit n, wherein n are arbitrary positive integer, and n DC-DC unit inputs
Series/parallel, output terminal series/parallel are held, for example the form of input terminal series connection, output terminal series connection may be used, such n
The sum of DC-DC unit input terminals are equal to the sum of 1 voltage of HVDC ports, n DC-DC unit output terminal equal to 2 voltage of HVDC ports.
The other forms such as input terminal series connection output terminal parallel connection can certainly be used.Flexibly with series unit number, reasonable selection can
Pressure resistance and the through-current capability of device are turned off, the DC converter for different voltages grade transformation application scenario can be designed.
For ease of description, following only illustrate by taking the applicable cases that HVDC ports 1 input, HVDC ports 2 export as an example.
It may be equally applicable for the applicable cases that HVDC ports 2 input, HVDC ports 1 export.
Wherein, the first connection terminal T of DC-DC units 11Pass through the direct current reactance L being serially connected1, switching device K11、K12
It is connected with the anode of HVDC ports 1；Switching device K12It is parallel with delay startup resistance R1, by switching open and close control delay startup resistance
R1Access circuit；Similar, the third connection terminal T of DC-DC units 13Pass through the direct current reactance L being serially connected2, switching device
K21、K22It is connected with the anode of HVDC ports 2；Switching device K22It is parallel with delay startup resistance R2, delayed by switching open and close control and opened
Dynamic resistance R2Access circuit.
First connection terminal T of m+1 platform DC-DC units1, third connection terminal T3Respectively with m platform DC-DC units
The sub- T of second connection end2、4th connection terminal T4It is connected, 1≤m<n；The sub- T of second connection end of n-th DC-DC unit2With HVDC
The cathode of port 1 is connected, the 4th connection terminal T4It is connected with the cathode of HVDC ports 2；So as to fulfill the defeated of n DC-DC unit
Enter the type of attachment of end series connection, output terminal series connection.
If 1 side voltage of HVDC ports is vdc1, 1 the first connection terminal of input terminal T of DC-DC units1, the sub- T of second connection end2Between
Voltage vdc11, 2 the first connection terminal of input terminal T of DC-DC units1, the sub- T of second connection end2Between voltage vdc12, and so on, DC-
DC unit n the first connection terminals of input terminal T1, the sub- T of second connection end2Between voltage vdc1n, then vdc11、vdc12、…vdc1nThe sum of etc.
In vdc1.It is corresponding, if 2 side voltage of HVDC ports is vdc2, then vdc21、vdc22、…vdc2nThe sum of be equal to vdc2。
DC-DC units provided by the utility model include sequentially connected input side interface circuit, input side limitation electricity
Road, input lateral capacitance C1, ITVDC converter unit, output lateral capacitance C2, outlet side limiting circuit and outlet side interface circuit.
Wherein, input side interface circuit and outlet side interface circuit are serially connected the switch be connected in turn including two
Pipe, in input side (vdc11、vdc12、…vdc1n) and outlet side (vdc21、vdc22、…vdc2n) it is respectively formed the pulse that duty ratio is D
Voltage；And adjust input lateral capacitance C1With output lateral capacitance C2DC voltage so that input lateral capacitance C1With output lateral capacitance C2
DC voltage matched always with the transformer voltage ratio in ITVDC converter unit, so as to highest efficiency.
Specifically, the specific embodiment as the utility model interface circuit, input side interface circuit includes mutual
The first switch pipe Q of series connection11, second switch pipe Q12, first switch pipe Q11Emitter and second switch pipe Q12Collector and first
Connection terminal T1It is connected, first switch pipe Q11Collector passes through the first buffering reactance L in input side limiting circuit1sWith input side
Capacitance C1Anode is connected, second switch pipe Q12Emitter and input lateral capacitance C1Cathode is connected, first switch pipe Q11, second switch
Pipe Q12Reverse parallel connection has diode M respectively11、M12；Outlet side interface circuit includes the first switch pipe Q being serially connected21, second
Switching tube Q22, first switch pipe Q21Emitter and second switch pipe Q22Collector and third connection terminal T3It is connected, first switch
Pipe Q21Collector passes through the second buffering reactance L in outlet side limiting circuit2sWith exporting lateral capacitance C2Anode is connected, second switch
Pipe Q22Emitter and output lateral capacitance C2Cathode is connected, first switch pipe Q21, second switch pipe Q22Reverse parallel connection has two poles respectively
Pipe M21、M22。
Input side limiting circuit and outlet side limiting circuit turned on and off for limiting above-mentioned interface circuit switching tube
The climbing of voltage and current in journey, as specific embodiment of the utility model, input side limiting circuit includes the first buffering
Capacitance C1s, the first buffering capacitance C1sAnode and diode D1sCathode connection, and pass through diode D1sIt is connected to the first buffering
Reactance L1sInput side interface circuit connecting side；First buffering capacitance C1sAnode also pass through the first buffer resistance R1sIt is connected to
First buffering reactance L1sInput lateral capacitance C1Anode connecting side；First buffering capacitance C1sCathode and input lateral capacitance C1Cathode
Connection.Q11Or Q12In opening process, L1sThe climbing of electric current, Q can be controlled11Or Q12During shutdown, C1s can be controlled
The climbing of voltage.
Outlet side limiting circuit includes the second buffering capacitance C2s, the second buffering capacitance C2sAnode and diode D2sIt is negative
Pole connects, and passes through diode D2sIt is connected to the second buffering reactance L2sOutlet side interface circuit connecting side；Second buffering capacitance
C2sAnode also pass through the second buffer resistance R2sIt is connected to the second buffering reactance L2sOutput lateral capacitance C2Anode connecting side；The
Two buffering capacitance C2sCathode and output lateral capacitance C2Cathode connects.
As the first embodiment of the utility model ITVDC converter unit, ITVDC converter unit input and output use
Full bridge structure, as shown in Figure 1, including sequentially connected input full-bridge circuit H1, isolating transformer T and output full-bridge circuit H2,
It inputs full-bridge circuit H1 and exports full-bridge circuit H2 using the construction of switch of switching device anti-parallel diodes as bridge arm
H full-bridge structure, specifically, the first bridge arm of input full-bridge circuit H1 includes switching device S11Anti-parallel diodes D11Group
Into first on bridge arm and switching device S12Anti-parallel diodes D12First lower bridge arm of composition；Input full-bridge circuit H1's
Second bridge arm includes switching device S13Anti-parallel diodes D13Bridge arm and switching device S on the second of composition14Reverse parallel connection
Diode D14Second lower bridge arm of composition.The first bridge arm for exporting full-bridge circuit H2 includes switching device S21Two pole of reverse parallel connection
Pipe D21Bridge arm and switching device S on the first of composition22Anti-parallel diodes D22First lower bridge arm of composition；Export full-bridge electricity
The second bridge arm of road H2 includes switching device S23Anti-parallel diodes D23Bridge arm and switching device S on the second of composition24Instead
To parallel diode D24Second lower bridge arm of composition.
As the utility model ITVDC converter unit another embodiment, ITVDC converter unit input and output use
H half-bridge structure, as shown in figure 3, including sequentially connected input half-bridge circuit H1, isolating transformer T and output half-bridge circuit H2,
It inputs half-bridge circuit H1 and exports half-bridge circuit H2 using the construction of switch of switching device anti-parallel diodes as bridge arm
Half-bridge structure, and half-bridge upper and lower bridge arm is parallel with DC capacitor respectively.Specifically, input half-bridge circuit H1 includes switching device
S11Anti-parallel diodes D11The upper bridge arm of composition and switching device S12Anti-parallel diodes D12The lower bridge arm of composition, upper bridge
Arm and lower bridge arm are parallel with DC capacitor C respectively13,C14；Upper and lower bridge arm connects midpoint and DC capacitor C13,C14Draw at connection midpoint
Go out to be connected to isolating transformer T primary side windings both ends.It exports half-bridge circuit H2 and includes switching device S21Anti-parallel diodes D21
The upper bridge arm of composition and switching device S22Anti-parallel diodes D22The lower bridge arm of composition, upper bridge arm and lower bridge arm are in parallel respectively
There is DC capacitor C23,C24；Upper and lower bridge arm connects midpoint and DC capacitor C23,C24Connection midpoint, which is drawn, is connected to isolating transformer T
Vice-side winding both ends.
Input full-bridge circuit H1 input anodes and input lateral capacitance C1Anode is connected, input cathode and input lateral capacitance
C1Cathode is connected.Export full-bridge circuit H2 output head anodes and output lateral capacitance C2Anode is connected, negative pole of output end and outlet side electricity
Hold C2Cathode is connected.
Above-mentioned switching tube Q11、Q12、Q21、Q22Using IGCT or ETO with low on-state voltage drop；Switching tube S11~S14、S21
~S24IGBT, IGCT and MOSFET may be used.
A kind of high-voltage large-capacity commutator transformer operation principle provided by the utility model：
In start-up course, switching device K11And K21Conducting, switching device K12And K22Shutdown, switching tube Q11、Q12、Q21、
Q22、S11~S14、S21~S24It is turned off, 1 electric current of HVDC ports passes through switching device K11, delay startup resistance R1, direct current reactance L1、
Switching tube Q11, buffering reactance L1sGive input lateral capacitance C1Charging, HVDC ports 2 are by switching device K21, delay startup resistance R2, it is straight
The anti-L2 of galvanic electricity, switching tube Q21, buffering reactance L2sGive output lateral capacitance C2Charging.After capacitance C1 and capacitance C2 charging completes, close
Combination switch K12 and K22.
In course of normal operation, switching tube Q11With switching tube Q12Rotation is connected, Q21And Q22Rotation is connected, mono- in DC-DC
Member is in input side (vdc11、vdc12、…vdc1n) and outlet side (vdc21、vdc22、…vdc2n) it is respectively formed the pulse electricity that duty ratio is D
Pressure.Fig. 2 is the ideal waveform of 1 normal operating conditions of HVDC ports, and the working condition of HVDC ports 2 is similar.
There is 120 degree of phase shifting angle, in HVDC between the pulse voltage that adjacent DC-DC units are exported in same side ports
1 (v of portdc1) and 2 (v of HVDC portsdc2) generate the pulse voltage of high switching frequency.
Due to the Q in input side interface circuit11、Q12With with the Q in outlet side interface circuit21、Q22It is operated in PWM shapes
State, so as to fulfill adjusting to input lateral capacitance C1 and exporting the DC voltage of lateral capacitance C2 so that input lateral capacitance C1 and output
The DC voltage of lateral capacitance C2 matches always with ITVDC converter unit isolating transformer T no-load voltage ratios, so as to highest efficiency.
There is 120 degree of phase shifting angle between the pulse voltage that adjacent DC-DC units are exported in same side ports, so that
Input series connection end output voltage (vdc1) switching frequency be each input interface unit output voltage (vdc11、vdc12、…vdc1n)
N times, so as to reduce the current ripples of HVDC ports 1.Corresponding output series connection end output voltage (vdc2) switching frequency
It is each output interface unit output voltage (vdc21、vdc22、…vdc2n) n times, so as to reduce the electric current of HVDC ports 2
Ripple
When a certain DC-DC units break down, switching tube Q11、Q21、S11~S14、S21~S24It disconnects, switching tube Q12With
Q22It is closed, by failure DC-DC unit bypass.When short trouble occurs in HVDC ports 1 or HVDC ports 2, all DC-DC are mono-
First switching tube disconnects.So as to effectively improve the reliability of high-voltage large-capacity commutator transformer.
Switching device involved by the utility model, be mechanical switch or semiconductor switch, such as MOSFET, IGBT, IGCT,
ETO, IETO etc..
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, in addition, this practicality
It is novel to have various modifications and changes.All any modifications made within the spirit and principle of the utility model are equally replaced
It changes, improve, should be included within the scope of protection of this utility model.
Claims (9)
1. a kind of high-voltage large-capacity commutator transformer, it is characterised in that：Including n identical input terminal series/parallel, output terminals
The modularization DC-DC units of series/parallel, wherein n are arbitrary positive integer；The DC-DC units include sequentially connected input
Side interface circuit, input lateral capacitance, ITVDC converter unit, output lateral capacitance and outlet side interface circuit；The input side joint
Mouth circuit and outlet side interface circuit are respectively by controlling switching tube conducting state to adjust input lateral capacitance and exporting lateral capacitance
DC voltage matches always with the transformer voltage ratio in ITVDC converter unit.
2. a kind of high-voltage large-capacity commutator transformer according to claim 1, it is characterised in that：The input side interface electricity
Input side limiting circuit is serially connected between road and input lateral capacitance, is serially connected between the outlet side interface circuit and output lateral capacitance defeated
Go out side limiting circuit, the input side limiting circuit and outlet side limiting circuit are respectively used to limit the input side interface circuit
The climbing of voltage and current during being turned on and off with outlet side interface circuit switching tube.
3. a kind of high-voltage large-capacity commutator transformer according to claim 2, it is characterised in that：The input side limitation electricity
Road and input side limiting circuit include buffering capacitance and buffering reactance, and the buffering capacitance is connected to buffering electricity by diode
Anti- respective side interface circuit connecting side；The anode of the buffering capacitance is also connected to the correspondence of buffering reactance by buffer resistance
Lateral capacitance anode connecting side；The cathode of the buffering capacitance is connected with corresponding lateral capacitance cathode.
4. a kind of high-voltage large-capacity commutator transformer according to claim 1, it is characterised in that：The input side interface electricity
Road and outlet side interface circuit include the first switch pipe and second switch pipe, input side interface circuit and the output that are serially connected
Side interface circuit by the first switch pipe and second switch pipe that are connected in turn, in input side and outlet side is exported and is accounted for respectively respectively
Sky is than the pulse voltage for D.
5. a kind of high-voltage large-capacity commutator transformer according to claim 4, it is characterised in that：The first switch pipe collection
Electrode is connected with respective side capacitance cathode, and second switch pipe emitter is connected with corresponding lateral capacitance cathode, the first switch pipe,
Reverse parallel connection has diode to second switch pipe respectively.
6. a kind of high-voltage large-capacity commutator transformer according to claim 1, it is characterised in that：Identical defeated of the n
In the modularization DC-DC units for entering end series connection output terminal series connection, the first connection terminal of the first DC-DC units is by being serially connected
Direct current reactance, first switch device, second switch device be connected with the anode of input side high-voltage power supply；First DC-DC units
Third connection terminal passes through the direct current reactance that is serially connected, first switch device, second switch device and outlet side high-voltage power supply
Anode is connected；The second switch device is parallel with delay startup resistance, and the second switch device is delayed by switching open and close control
Start resistance access circuit.
7. a kind of high-voltage large-capacity commutator transformer according to claim 6, it is characterised in that：Identical defeated of the n
In the modularization DC-DC units for entering end series connection output terminal series connection, the first connection terminal of m+1 platform DC-DC units, third connection
Terminal is connected respectively with the second connection end of m platform DC-DC units, the 4th connection terminal, 1≤m<n；N-th DC-DC unit
Second connection end with input high-voltage power supply cathode be connected, the 4th connection terminal T4It is connected with the cathode for exporting high-voltage power supply.
8. a kind of high-voltage large-capacity commutator transformer according to claim 1, it is characterised in that：The DC converter list
Member includes sequentially connected input circuit, isolating transformer and output circuit, the input full-bridge circuit and output full-bridge circuit
Using H full-bridge structure or half-bridge structure of the construction of switch of switching device anti-parallel diodes as bridge arm.
9. a kind of high-voltage large-capacity commutator transformer according to claim 1, it is characterised in that：Identical defeated of the n
Enter in the modularization DC-DC units that end series connection output terminal is connected, the pulse voltage that adjacent DC-DC units are exported in same side ports
Between there is 120 degree of phase shifting angle.
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| CN201721588832.5U CN207475408U (en) | 2017-11-24 | 2017-11-24 | A kind of high-voltage large-capacity commutator transformer |
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| CN201721588832.5U CN207475408U (en) | 2017-11-24 | 2017-11-24 | A kind of high-voltage large-capacity commutator transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834854A (en) * | 2017-11-24 | 2018-03-23 | 清华大学 | A kind of high-voltage large-capacity commutator transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834854A (en) * | 2017-11-24 | 2018-03-23 | 清华大学 | A kind of high-voltage large-capacity commutator transformer |
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