CN103944400B - The bidirectional high-pressure DC/DC topological structure of multi-coil single-phase mid-frequency square-wave transformer - Google Patents
The bidirectional high-pressure DC/DC topological structure of multi-coil single-phase mid-frequency square-wave transformer Download PDFInfo
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- CN103944400B CN103944400B CN201410178091.8A CN201410178091A CN103944400B CN 103944400 B CN103944400 B CN 103944400B CN 201410178091 A CN201410178091 A CN 201410178091A CN 103944400 B CN103944400 B CN 103944400B
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Abstract
The invention discloses a kind of bidirectional high-pressure DC/DC topological structure of multi-coil single-phase mid-frequency square-wave transformer, including：Controller, filter inductance, controller adopt multistage half bridge control unit cascaded structure, each half bridge control unit to be made up of two parallel branches, and the intermediate point of two branch roads distinguishes a coil of connection transformer winding；Half bridge control unit of same for transformator every group of coil of winding is together in series along polarity by the independent lead of each coil of the Transformer Winding to controller, and composition winding control topology, the filtered inductance of two groups of control topology are connected along polarity after separating.The time rate of change of voltage and current during the double-direction control that intermediate-frequency transformer winding power stream can effectively be improved of the invention, it is automatically obtained the dynamic equalization to condenser voltage, control is flexibly, the asynchronous power device for causing of power control device triggering and conducting can be effectively prevented from and bear that voltage is uncontrollable, effectively suppress the current ripples of DC capacitor charging current and DC source.
Description
Technical field
The present invention relates to a kind of bidirectional high-pressure DC/DC topological structure of multi-coil single-phase transformer, more particularly to one
Plant the high pressure DC/DC topological structure of intermediate frequency square-wave transformer.
Background technology
D.C. high voltage transmission and distribution type electric energy utilize the development of technology, and multiterminal element electrical network is following distributed power transmission and distribution
The key technology of net.Different brackets direct current network do not exist the interconnection of two AC networks must be fulfilled for the phase place of voltage, frequency and
Amplitude matching condition, it are isolated by intermediate-frequency transformer, using the topological structure of DC/AC/ intermediate-frequency transformers/AC/DC, realize
The interconnection of direct current network, fault tolerance are good.
Sine wave intermediate-frequency transformer is needed using many level conversion control technologies, and multilevel circuit topological structure is usual
Pressed using neutral point diode clamper or striding capacitance, and H bridge cascade systems, these topological structure and control method all ten
Divide complexity, and the electric current of make-and-break size and time length of different capacity switching tube are all unbalanced, cause power switch pipe and continue
The loss heating of stream diode is different, easily causes some device heat ageings seriously, affects system reliability.
Traditional multi-level topology controls Transformer Winding after connecting due to power switch pipe again, for intermediate frequency square-wave transformer
Drive and then do not require nothing more than power switch pipe synchronously triggering concordance is good, and in short-term after synchronous triggering and conducting, transformator bears entirely
Portion's direct current power source voltage, rate of change du/dt is very high for voltage time, cause the transformator distribution capacity charging current that can not ignore and
The problems such as winding Potential distribution uneven wave process.
China Patent Publication No. is：103178742A (Application No. 201310088405.0), entitled：A kind of group
Box-like two-way DC/AC converter topologies, the topology of the patent of invention are made up of identical three-phase circuit, each by isolating
Half-bridge DC/DC current transformers and tandem type H bridge DC/AC current transformers are combined, the output-parallel of isolated half-bridge DC/DC current transformer
After one capacitor (C1) as tandem type DC/AC current transformer single-stage H bridges input, per one-level H bridge with independent isolated half-bridge
DC/DC current transformers are connected.It is mutually respectively independent half that the patent adopts multiple isolating transformers, each transformator input side and outlet side
Bridge control unit, simply each DC voltage formed through half bridge control unit of outlet side is again through H bridge control unit inversions
Into exchange output, and the output of these H bridge control units is connected to form many level exchange outputs.Due to each isolation transformation
Half-bridge DC/DC current transformers are adopted before and after device, and multiple transformers system effectiveness is low, and single half bridge control unit of system three-phase input is pressure
Low, it is not suitable for HVDC input, although in addition output can form high pressure, output control through the series connection of H bridge control units
Cell power switching tube quantity is more, is also not suitable for D.C. high voltage transmission.
Content of the invention
For defect of the prior art, it is an object of the invention to provide a kind of multi-coil single-phase mid-frequency square-wave transformer
Bidirectional high-pressure DC/DC topological structure, using modularity half-bridge control structure, can effectively improve intermediate-frequency transformer winding power
The time rate of change of voltage and current during the double-direction control of stream, is automatically obtained the equilibrium to condenser voltage, and control is flexible,
The asynchronous power device for causing of power control device triggering and conducting can be prevented effectively from and bear uncontrollable voltage problem.
The purpose of the present invention is achieved through the following technical solutions：
A kind of high pressure DC/DC topological structure of multi-coil single-phase mid-frequency square-wave transformer, including：Controller and connect therewith
The filter inductance for connecing, wherein：
Controller adopts multistage half bridge control unit cascaded structure, and each half bridge control unit is by two parallel branch groups
Into, wherein one two power switch pipe series circuits of the route comprising inverse parallel fly-wheel diode, another branch road is two
Individual capacitor series circuit, the intermediate point of two branch roads distinguish a coil of connection transformer winding；
The Transformer Winding adopts multi-thread coil structures, and the independent lead of each coil is to controller；The transformator is same
Multiple coils of winding are divided into two groups, and each coil in each group is connected with corresponding half bridge control unit respectively, its center line
The extreme direction of the same name of circle is consistent, and half bridge control unit of same for transformator every group of coil of winding is together in series along polarity, constitutes
Two groups of high pressure winding control topologys and/or two groups of low pressure winding control topologys；
The filtered inductance of two groups of controls topologys of the same winding of the transformator is connected along polarity after separating, and constitutes transformator
The control topological structure of same winding, the structure are connected with DC source.
Preferential, the high and low pressure winding coil of the transformator is arranged in order, and shares a shell-type magnetic core magnetic circuit, by institute
Around to being respectively divided into two groups, each group is arranged in order according to low pressure, high pressure winding coil according to same to state high and low pressure winding coil, and two
Group high pressure winding coil is clipped in the middle of two groups of low pressure winding coils, is separated with insulation board between adjacent windings；Above-mentioned coil lead
Plus drawn after ceramics pipe outer successively, and labelling Same Name of Ends.
Preferential, in half bridge control unit：Two power switch pipes connect to form three tie-point P1, P2And P3, two
Individual same specification capacitor connects to form three tie-point Q1, Q2And Q3, the tie-point P1With Q1Positive pole S is drawn in connection1+, described
Tie-point P3With Q3Negative pole S is drawn in connection1-, the tie-point P2It is connected with coil Same Name of Ends, tie-point Q2Connect with the coil other end
Connect.
Preferential, the control power can be with two-way flow.
Preferential, there is no the tube voltage drop uncontrollability that synchronously triggering nonuniformity causes and ask in the power switch pipe control
Topic, can achieve zero current passing.
Preferably, in the power control process, each condenser voltage can realize automatic equalization.
Compared with prior art, the present invention has following beneficial effect：
First, using H-bridge controller topology cascade structure, realize modularized design, it is not necessary to clamp diode or fly across
Electric capacity.
Second, the coil winding of high and low pressure winding on same magnetic core, bear by each coil independent control, each coil
Unidirectional current is forced down, and the voltage time rate of change for bearing is little and basically identical, can effectively weaken the charging of total head winding distribution capacity
The electric current uneven wave process of Potential distribution greatly.
3rd, power switch pipe does not have that the tube voltage drop that synchronous triggering diversity causes is uncontrollable yet, it is not necessary to soft
Switching technique can be achieved with zero current passing.
4th, coil intercouples and can realize the automatic equalization of each DC capacitor voltage, can by median filter inductance
Effectively to limit the charging current of DC capacitor and ripple current to power supply.
Description of the drawings
The detailed description that non-limiting example is made with reference to the following drawings by reading, the further feature of the present invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the bidirectional high-pressure DC/DC control topological structure schematic diagrams in one embodiment of the invention；
Fig. 2 is multi-coil single-phase mid-frequency square-wave transformer coil Same Name of Ends arrangement schematic diagram in one embodiment of the invention；
Fig. 3 is multi-coil single-phase mid-frequency square-wave transformer module control structure schematic diagram in one embodiment of the invention；
Fig. 4 is that one coil half-bridge of transformator controls control unit topological structure schematic diagram in one embodiment of the invention；
In figure：1- DC sources, 2- H-bridge controller units, 3- filter inductances, 4- power switch pipes, 5- transformer wires
Circle, 6- capacitors.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill to this area
For personnel, without departing from the inventive concept of the premise, some deformations and improvement can also be made.These belong to the present invention
Protection domain.
The present embodiment problem to be solved is to find a kind of non-critical synchronously to trigger, and modular construction, with auto zero electricity
Conductance is logical and the intermediate frequency square-wave transformer high pressure DC/DC topological structure of direct current capacitors uniform voltage function, be effectively reduced voltage and
Electric current and its time change stress.
As shown in figure 1, the bidirectional high-pressure DC/DC controls of the multi-coil single-phase mid-frequency square-wave transformer in one embodiment of the invention
Topological structure schematic diagram processed；The topological structure includes：Controller and the filter inductance 3 being attached thereto, wherein：
Controller adopts multistage half bridge control unit, 2 cascaded structure, and each half bridge control unit 2 is by two parallel branch groups
Into, wherein one two power switch pipe 4 series circuits of the route comprising inverse parallel fly-wheel diode, another branch road is two
A coil 5 of connection transformer winding distinguished by 6 series circuit of individual capacitor, the intermediate point of two branch roads；
The Transformer Winding adopts multi-thread coil structures, and each 5 independent lead of coil is to outside controller；The transformation
Multiple coils of the same winding of device are divided into two groups, and each coil 5 in each group is connected with corresponding half bridge control unit respectively,
The extreme direction of the same name of its coil 5 is consistent, and half bridge control unit of same for transformator every group of coil of winding is connected along polarity
Come, two groups of high pressure winding control topologys of composition and/or two groups of low pressure windings control topology；
The filtered inductance 3 of two groups of controls topologys of the same winding of the transformator is connected along polarity after separating, and constitutes transformation
The control topological structure of the same winding of device, the structure are connected with DC source 1.
In the present embodiment, in same magnetic core, extreme direction of the same name is consistent, and lead-out wire connects respectively for each coil winding of Transformer Winding
High pressure DC/DC controls topological structure with series filtering inductance, being made up of is connected to half bridge control unit, and concrete operations are as follows：
(1) purchase high and low pressure winding coil, by the coil according to same around to being respectively divided into two groups, each group according to
Low pressure, high-tension coil are arranged in order, and two groups of high-tension coils are clipped in the middle of two groups of low-voltage coils, between adjacent windings with insulation board every
Open, the insulation board is thick with 2-3mm between group coil, and between different groups, 10-15mm is thick；
(2) above-mentioned coil lead is added and drawn after ceramics pipe outer successively, and labelling Same Name of Ends, as shown in Figure 1.
(3) by two series connection of the power switch pipe comprising inverse parallel fly-wheel diode respectively, three tie-point P are formed1, P2
And P3, two same specification capacitors are connected, form three tie-point Q1, Q2And Q3, respectively by P1With Q1Positive pole S is drawn in connection1+,
P3With Q3Negative pole S is drawn in connection1-, respectively by P2It is connected with coil Same Name of Ends, Q2It is connected with the coil other end, as shown in Figure 4.
(4) half-bridge of same winding is connected along polarity successively, middle series filtering inductance forms positive and negative polarities and connects direct current
Power supply, at this moment all power switch pipes be not turned on, DC source to series capacitor charge, filter inductance play restriction charge electricity
The effect of stream, as shown in Figure 4.
The present embodiment intermediate frequency square-wave transformer high pressure winding 50kV point is 46 coils, and low pressure winding 5kV is also classified into 4 lines
Circle, each winding adopt modularity H-bridge controller cascading topological structure.Accompanying drawing 1 depicts the topological structure of 10 units, Fig. 2
Depict the Same Name of Ends relation of 10, transformator one time and secondary 8 coils, module topology structure such as 3 institute of accompanying drawing of general type
Show, accompanying drawing 4 is unit topological structure, including power electronic devices, equalizing capacitor and coil, the topological structure phase of each unit
With.
The high pressure DC/DC topological structure of multi-coil single-phase mid-frequency square-wave transformer of the present invention is that each coil is individually controlled
System, using H-bridge controller topology cascade structure, not only can realize modularized design, and each coil can be made to bear directly
Stream voltage is low, and the voltage time rate of change for bearing is little and basically identical, can effectively weaken the charging of total head winding discrete capacitor
The electric current uneven wave process of Potential distribution greatly, power switch pipe does not have the tube voltage drop that synchronously triggering diversity causes yet can not
Control problem, it is not necessary to which soft switch technique can be achieved with zero current passing, the advantages of DC capacitor voltage can realize automatic equalization,
Direct current capacitors can effectively be limited by median filter inductance and be parallel to the charging current of DC source and ripple to power supply
Electric current.
To sum up, the present invention can effectively improve power device voltage and current stress, can realize higher than transformer voltage
DC bus-bar voltage conversion, coil current can be distributed automatically as coil intercouples in control process, realize series capacitance
The equilibrium of voltage.
Above the specific embodiment of the present invention is described.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various modifications or modification within the scope of the claims, this not shadow
Ring the flesh and blood of the present invention.
Claims (5)
1. the bidirectional high-pressure DC/DC topological structure of a kind of multi-coil single-phase mid-frequency square-wave transformer, it is characterised in that include：Control
Device and the filter inductance being attached thereto, wherein：
Controller adopts multistage half bridge control unit cascaded structure, each half bridge control unit to be made up of two parallel branches, its
In one two power switch pipe series circuit of the route comprising inverse parallel fly-wheel diode, another branch road is two electric capacity
A coil of connection transformer winding distinguished by device series circuit, the intermediate point of two branch roads；The power switch pipe is controlled not
There is the tube voltage drop uncontrollability that synchronous triggering nonuniformity causes, can achieve zero current passing；
The Transformer Winding adopts multi-thread coil structures, and the independent lead of each coil is to controller；The same winding of the transformator
Multiple coils be divided into two groups, each coil in each group respectively with corresponding half bridge control unit connect, its coil
Extreme direction of the same name is consistent, and half bridge control unit of same for transformator every group of coil of winding is together in series along polarity, constitutes two groups
High pressure winding control topology and/or two groups of low pressure winding control topologys；
The filtered inductance of two groups of controls topologys of the same winding of the transformator is connected along polarity after separating, and composition transformator is same
The control topological structure of winding, the structure are connected with DC source.
2. the bidirectional high-pressure DC/DC topological structure of a kind of multi-coil single-phase mid-frequency square-wave transformer according to claim 1,
Characterized in that, the high and low pressure winding coil of the transformator is arranged in order, share a shell-type magnetic core magnetic circuit, by described high,
According to same around to being respectively divided into two groups, each group is arranged in order low pressure winding coil according to low pressure, high pressure winding coil, two groups of high pressure
Winding coil is clipped in the middle of two groups of low pressure winding coils, is separated with insulation board between adjacent windings；Above-mentioned coil lead adds insulation
Drawn after earthenware successively, and labelling Same Name of Ends.
3. the bidirectional high-pressure DC/DC topological structure of a kind of multi-coil single-phase mid-frequency square-wave transformer according to claim 2,
Characterized in that, in half bridge control unit：Two power switch pipes connect to form three tie-point P1, P2And P3, two same
Specification capacitor connects to form three tie-point Q1, Q2And Q3, the tie-point P1With Q1Positive pole S is drawn in connection1+, the connection
Point P3With Q3Negative pole S is drawn in connection1-, the tie-point P2It is connected with coil Same Name of Ends, tie-point Q2It is connected with the coil other end.
4. the bidirectional high-pressure DC/DC of a kind of multi-coil single-phase mid-frequency square-wave transformer according to any one of claim 1-3
Topological structure, it is characterised in that the control power of the power switch pipe can be with two-way flow.
5. the bidirectional high-pressure DC/DC of a kind of multi-coil single-phase mid-frequency square-wave transformer according to any one of claim 1-3
Topological structure, it is characterised in that in power control process, each condenser voltage can realize automatic equalization.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410178091.8A CN103944400B (en) | 2014-04-29 | 2014-04-29 | The bidirectional high-pressure DC/DC topological structure of multi-coil single-phase mid-frequency square-wave transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410178091.8A CN103944400B (en) | 2014-04-29 | 2014-04-29 | The bidirectional high-pressure DC/DC topological structure of multi-coil single-phase mid-frequency square-wave transformer |
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| CN103944400A CN103944400A (en) | 2014-07-23 |
| CN103944400B true CN103944400B (en) | 2017-03-15 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101795081A (en) * | 2010-03-03 | 2010-08-04 | 中国科学院电工研究所 | Power electronic transformer having multi-winding isolation transformer |
| CN102163927A (en) * | 2011-04-20 | 2011-08-24 | 清华大学 | Multi-level converter employing multi-winding intermediate-high frequency transformer |
| CN103178742A (en) * | 2013-03-19 | 2013-06-26 | 北京交通大学 | Topological structure of combined bidirectional DC/AC (direct current/alternating current) converter |
| CN103427658A (en) * | 2013-08-01 | 2013-12-04 | 南京南瑞继保电气有限公司 | High-voltage DC-DC conversion device based on multi-winding transformer |
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2014
- 2014-04-29 CN CN201410178091.8A patent/CN103944400B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101795081A (en) * | 2010-03-03 | 2010-08-04 | 中国科学院电工研究所 | Power electronic transformer having multi-winding isolation transformer |
| CN102163927A (en) * | 2011-04-20 | 2011-08-24 | 清华大学 | Multi-level converter employing multi-winding intermediate-high frequency transformer |
| CN103178742A (en) * | 2013-03-19 | 2013-06-26 | 北京交通大学 | Topological structure of combined bidirectional DC/AC (direct current/alternating current) converter |
| CN103427658A (en) * | 2013-08-01 | 2013-12-04 | 南京南瑞继保电气有限公司 | High-voltage DC-DC conversion device based on multi-winding transformer |
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| CN103944400A (en) | 2014-07-23 |
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