CN106998139B - Electrical isolation bidirectional DC-DC converter without Pressure and Control - Google Patents
Electrical isolation bidirectional DC-DC converter without Pressure and Control Download PDFInfo
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- CN106998139B CN106998139B CN201610047397.9A CN201610047397A CN106998139B CN 106998139 B CN106998139 B CN 106998139B CN 201610047397 A CN201610047397 A CN 201610047397A CN 106998139 B CN106998139 B CN 106998139B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
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- Rectifiers (AREA)
- Inverter Devices (AREA)
Abstract
The present invention provides the electrical isolation bidirectional DC-DC converter for being not necessarily to Pressure and Control.The two-way DC--DC converter, by multiple DC-AC converters and AC transformer joint mapping based on modularization multi-level converter (MMC).Modularization multi-level converter can conveniently realize the two-way DC--DC converter in the application of high-power occasion using its modular characteristic；The use of multiple modularization multi-level converter DC-AC converters makes converter have the characteristic of way traffic；Transformer then guarantees the electrical isolation between converter two sides.Auxiliary capacitor, auxiliary IGBT module, the clamp diode configured at the same time without the electrical isolation bidirectional DC-DC converter of Pressure and Control by inside can be on the basis of two-way DC--DC converter realizes DC voltage conversion, the spontaneously capacitance voltage of equilibrium DC-AC converter Neutron module, without special Pressure and Control.
Description
Technical field
The present invention relates to transmission & distribution electro-technical fields, and in particular to a kind of electrical isolation bi-directional DC-DC without Pressure and Control
Converter.
Technical background
DC-DC converter is the important component of DC grid, the DC-DC based on modularization multi-level converter MMC
Converter is suitable for high-power occasion since MMC constructs DC-AC converter by the way of sub-module cascade, has very
High application prospect.
The DC voltage of MMC is not supported by a bulky capacitor, but by a series of mutually independent suspension submodules
Capacitor supported in series.Also for the transfer efficiency for improving DC-DC converter, it is necessary to assure submodule capacitor voltage is in bridge arm power
Periodical flowing in be in the state of dynamic stability.
Sequence based on capacitance voltage sequence pressure algorithm is current solution MMC Neutron module capacitance voltage equalization problem
Mainstream thinking.Firstly, the realization of ranking function must rely on capacitance voltage Millisecond sampling, need a large amount of sensor and
Optical-fibre channel is cooperated；Secondly, the operand of capacitance voltage sequence increases rapidly when group number of modules increases, for control
The hardware design of device brings huge challenge；In addition, sequence presses the realization of algorithm to have very high want to the frequency of cut-offfing of submodule
It asks, cut-offs frequency and be closely related with equalizing effect, in practice process, probably due to the limitation of equalizing effect, it has to improve
The triggering frequency of submodule, and then the increase for bringing inverter to be lost.
Summary of the invention
In view of the above-mentioned problems, it is an object of the invention to propose a kind of bidirectional DC-DC converter for not depending on pressure algorithm.
The specific constituted mode of the present invention is as follows.
Without the electrical isolation bidirectional DC-DC converter of Pressure and Control, including what is be made of modularization multi-level converter
DC-AC converter；The AC transformer of exchange output including connection DC-AC converter.
The above-mentioned electrical isolation bidirectional DC-DC converter without Pressure and Control, in DC-AC converter, first auxiliary electricity
Hold anode connection auxiliary IGBT module, cathode connection clamp diode is incorporated to DC bus anode；Second auxiliary capacitor cathode
Connection auxiliary IGBT module, anode connection clamp diode are incorporated to DC bus cathode.In addition to this A phase in DC-AC converter,
B phase is combined by improved half-bridge submodule, single clamp submodule, full-bridge submodule with clamp diode.
The above-mentioned electrical isolation bidirectional DC-DC converter without Pressure and Control, AC transformer connect different DC-AC and become
The exchange of parallel operation midpoint exports.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
Fig. 1 is improved sub-modular structure schematic diagram in A phase；
Fig. 2 is improved sub-modular structure schematic diagram in B phase；
Fig. 3 is the electrical isolation bidirectional DC-DC converter without Pressure and Control.
Specific embodiment
For the performance and working principle that the present invention is further explained, once in conjunction with attached drawing to constituted mode and work of the invention
It is specifically described as principle.But the bidirectional DC-DC converter based on the principle is not limited to Fig. 3.
With reference to Fig. 3, without the electrical isolation bidirectional DC-DC converter of Pressure and Control, including by the modular multilevel change of current
The DC-AC converter that device is constituted；The AC transformer of exchange output including connection DC-AC converter.
In DC-AC converter, auxiliary capacitor C1Anode is through node Na_03Connection auxiliary IGBT module T1, cathode is through node
Nb_03Connection clamp diode is incorporated to DC bus anode；Auxiliary capacitor C2Cathode is through node Nb_(2n+1)3Connection auxiliary IGBT module
T2, anode is through node Na_(2n+1)3Connection clamp diode is incorporated to DC bus cathode, and wherein n is natural number.DC-AC converter
Middle A phase, B phase are combined by improved half-bridge submodule, single clamp submodule, full-bridge submodule with clamp diode,
In improved submodule there are three port.For i-th of submodule SM in A phasei, wherein the value of i is 1~2n, the son
When module is half-bridge submodule, port Na_i1Connexon module I GBT module midpoint, port Na_i2Connexon module capacitance Ca_iIt is negative
Pole, port Na_i3Through mechanical switch connexon module capacitance Ca_iAnode；When the submodule is single clamp submodule, diode connects
Meet submodule capacitor Ca_iAnode, IGBT module connexon module capacitance Ca_iCathode, while port Na_i1Connexon module I GBT
Module midpoint, port Na_i2Connect diode and IGBT module tie-point, port Na_i3Through additional IGBT module connection submodule electricity
Hold Ca_iAnode；When the submodule is full-bridge submodule, port Na_i1Connect a sub- module I GBT module midpoint, port Na_i2Even
Meet another IGBT module midpoint, port Na_i3Through adding IGBT module connexon module capacitance Ca_iAnode.Port Na_i1、Na_i2
Port N is connected to through conducting wire or bridge arm reactora_(i-1)2、Na_(i+1)1, port Na_i3Port is connected to through clamp diode
Na_(i-1)3、Na_(i+1)3.For i-th of submodule SM in B phasei, wherein the value of i is 1~2n, which is half-bridge submodule
When, port Nb_i1Connexon module capacitance Cb_iAnode, port Nb_i2Connexon module I GBT module midpoint, port Nb_i3Through machinery
Switch connexon module capacitance Cb_iCathode；When the submodule is single clamp submodule, IGBT module connexon module capacitance Cb_i
Anode, diode connexon module capacitance Cb_iCathode, while port Nb_i1Connect IGBT module and diode connection point, port
Nb_i2Connexon module I GBT module midpoint, port Nb_i3Through adding IGBT module connexon module capacitance Cb_iCathode；The submodule
When block is full-bridge submodule, port Nb_i1Connect a sub- module I GBT module midpoint, port Nb_i2Connect another IGBT module
Midpoint, port Nb_i3Through adding IGBT module connexon module capacitance Cb_iCathode.Port Nb_i1、Nb_i2Through conducting wire or bridge arm reactance
Device is connected to port Nb_(i-1)2、Nb_(i+1)1, port Nb_i3Port N is connected to through clamp diodeb_(i-1)3、Nb_(i+1)3。
Under normal circumstances, mechanical switch and additional IGBT module are normally closed in improved submodule, first submodule of A phase
Capacitor Ca_1When bypass, IGBT module T is assisted at this time1It disconnects, submodule capacitor Ca_1With auxiliary capacitor C1Simultaneously by clamp diode
Connection；I-th of submodule capacitor C of A phaseau_iWhen bypass, wherein the value of i is 2~2n, submodule capacitor Ca_iWith submodule capacitor
Ca_i-1Pass through clamp diode parallel connection；Assist IGBT module T2When closure, auxiliary capacitor C2Pass through clamp diode and submodule
Capacitor Ca_2nIt is in parallel.
Under normal circumstances, mechanical switch and additional IGBT module are normally closed in improved submodule, assist IGBT module T1
When closure, auxiliary capacitor C1With first submodule submodule capacitor C of B phaseb_1Pass through clamp diode parallel connection；I-th of son of B phase
Module capacitance Cb_iWhen bypass, wherein the value of i is 1~2n-1, submodule capacitor Cb_iWith submodule capacitor Cb_i+1Pass through clamp
Diodes in parallel；2n sub- module capacitance C of B phaseb_2nWhen bypass, submodule capacitor Cb_2nWith auxiliary capacitor C2Pass through clamp two
Pole pipe is in parallel.Wherein assist IGBT module T1Trigger signal it is consistent with the trigger signal of first submodule of A phase；Assist IGBT
Module T2Trigger signal it is consistent with the trigger signal of B phase n-th submodule.
During DC voltage conversion, each submodule alternately puts into, bypasses, and assists IGBT module T1、T2Alternating is opened
It closes, A, B phase submodule capacitor voltage meet lower column constraint under the action of clamp diode:
UC1≥UCa_1≥UCa_2…≥UCa_n≥UCa_n+1…≥UCa_2n≥UC2
UC1≤UCb_1≤UCb_2…≤UCb_n≤UCb_n+1…≤UCb_2n≤UC2
It follows that during the DC-DC converter realizes DC voltage conversion, it is improved in DC-AC converter
Submodule capacitor voltage meets following constraint condition:
UC1=UCa_1...=UCa_n...=UCa_2n=UCb_1...=UCb_n...=UCb_2n=UC2
By it is above-mentioned illustrate it is found that the bidirectional DC-DC converter realize DC voltage conversion during, DC-AC
Converter is not necessarily to Pressure and Control.
Finally it should be noted that: described embodiment is only some embodiments of the present application, rather than whole realities
Apply example.Based on the embodiment in the application, those of ordinary skill in the art are obtained without making creative work
Every other embodiment, shall fall in the protection scope of this application.
Claims (1)
1. being not necessarily to the electrical isolation bidirectional DC-DC converter of Pressure and Control, it is characterised in that: including by the modular multilevel change of current
The DC-AC converter that device is constituted, the AC transformer of the exchange output including connection DC-AC converter；Wherein, AC transformer
The exchange output of different DC-AC converter midpoints is connected, wherein AC transformer can be multiwinding transformer, connect multiple
DC-AC converter；In DC-AC converter, auxiliary capacitor C1Anode is through node Na_03Connection auxiliary IGBT module T1Collector is born
Pole is through node Nb_03Connect clamp diode D1Anode bridges circuit with bridge arm in A, B phase of latter three composition, passes through T1Transmitting
Pole and D1Cathode is incorporated to DC bus anode；Auxiliary capacitor C2Cathode is through node Nb_(2n+1)3Connection auxiliary IGBT module T2Transmitting
Pole, anode is through node Na_(2n+1)3Connect clamp diode D2Cathode bridges circuit with A, B phase lower bridge arm that latter three is constituted, leads to
Cross T2Collector and D2Anode is incorporated to DC bus cathode, and wherein n is natural number；After A phase, B phase are by being transformed in DC-AC converter
Half-bridge submodule, single clamp submodule, full-bridge submodule combined with clamp diode, wherein improved bridge arm submodule
There are three ports for block；For i-th of bridge arm submodule SM in A phasei, wherein the value of i is 1~2n, which is
When improved half-bridge submodule, port Na_i1Connect the midpoint of two IGBT modules in half-bridge submodule, port Na_i2Connexon
Module capacitance Ca_iCathode, port Na_i3Through mechanical switch connexon module capacitance Ca_iAnode；The bridge arm submodule is after being transformed
Single clamp submodule when, it is single to clamp diode connexon module capacitance C in submodulea_iAnode, while port Na_i1Connection is single
Clamp the midpoint of two IGBT modules in submodule, port Na_i2Diode is coupled with IGBT module in the single clamp submodule of connection
Point, port Na_i3Connect additional IGBT module emitter and through additional IGBT module collector connexon module capacitance Ca_iAnode；
When the bridge arm submodule is improved full-bridge submodule, port Na_i1Connect in one group of full-bridge submodule two IGBT modules
Midpoint, port Na_i2Connect the midpoint of two IGBT modules in another group of full-bridge submodule, port Na_i3Connect additional IGBT module
Emitter and the additional IGBT module collector connexon module capacitance C of warpa_iAnode；Port Na_(k+1)1Upwards through conducting wire or bridge arm
Reactor is connected to port Na_k2, port Na_(k+1)3It connects up through connection clamper diode cathode and through clamp diode cathode
To port Na_k3, wherein the value of k is 0~2n；For i-th of bridge arm submodule SM in B phasei, wherein the value of i is 1~2n,
When the bridge arm submodule is improved half-bridge submodule, port Nb_i1Connexon module capacitance Cb_iAnode, port Nb_i2Connection
The midpoint of two IGBT modules in half-bridge submodule, port Nb_i3Through mechanical switch connexon module capacitance Cb_iCathode；The bridge arm
It is single to clamp diode connexon module capacitance C in submodule when submodule is improved single clamp submoduleb_iCathode, simultaneously
Port Nb_i1The tie-point of IGBT module and diode, port N in the single clamp submodule of connectionb_i2In the single clamp submodule of connection
The midpoint of two IGBT modules, port Nb_i3Connect additional IGBT module emitter and through additional IGBT module collector connexon
Module capacitance Cb_iCathode；When the bridge arm submodule is improved full-bridge submodule, port Nb_i1Connect one group of full-bridge submodule
The midpoint of interior two IGBT modules, port Nb_i2Connect the midpoint of two IGBT modules in another group of full-bridge submodule, port Nb_i3
Connect additional IGBT module emitter and through additional IGBT module collector connexon module capacitance Cb_iCathode；Port Nb_(k+1)1
Port N is connected to through conducting wire or bridge arm reactor upwardsb_k2, port Nb_(k+1)3Through connection clamper diode cathode and through clamper two
Pole pipe cathode is connected upwardly to port Nb_k3, wherein the value of k is 0~2n.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610047397.9A CN106998139B (en) | 2016-01-25 | 2016-01-25 | Electrical isolation bidirectional DC-DC converter without Pressure and Control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610047397.9A CN106998139B (en) | 2016-01-25 | 2016-01-25 | Electrical isolation bidirectional DC-DC converter without Pressure and Control |
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| Publication Number | Publication Date |
|---|---|
| CN106998139A CN106998139A (en) | 2017-08-01 |
| CN106998139B true CN106998139B (en) | 2019-10-18 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832841A (en) * | 2012-08-27 | 2012-12-19 | 清华大学 | Modularized multi-level converter with auxiliary diode |
| CN203166765U (en) * | 2013-01-15 | 2013-08-28 | 国网智能电网研究院 | Isolation type DC/DC converter based on modularization multi-level transverter |
| CN204145305U (en) * | 2014-09-16 | 2015-02-04 | 安徽理工大学 | A kind of novel DC-AC-DC converter being applied to high voltage direct current transmission |
| CN104578869A (en) * | 2014-12-23 | 2015-04-29 | 北京理工大学 | Capacitance self-voltage-sharing three-phase multi-level converter circuit with direct-current bus |
| US9219423B2 (en) * | 2011-10-18 | 2015-12-22 | Yao Lv | Converter bridge arm suitable for high-voltage applications and application system thereof |
-
2016
- 2016-01-25 CN CN201610047397.9A patent/CN106998139B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9219423B2 (en) * | 2011-10-18 | 2015-12-22 | Yao Lv | Converter bridge arm suitable for high-voltage applications and application system thereof |
| CN102832841A (en) * | 2012-08-27 | 2012-12-19 | 清华大学 | Modularized multi-level converter with auxiliary diode |
| CN203166765U (en) * | 2013-01-15 | 2013-08-28 | 国网智能电网研究院 | Isolation type DC/DC converter based on modularization multi-level transverter |
| CN204145305U (en) * | 2014-09-16 | 2015-02-04 | 安徽理工大学 | A kind of novel DC-AC-DC converter being applied to high voltage direct current transmission |
| CN104578869A (en) * | 2014-12-23 | 2015-04-29 | 北京理工大学 | Capacitance self-voltage-sharing three-phase multi-level converter circuit with direct-current bus |
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| Publication number | Publication date |
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| CN106998139A (en) | 2017-08-01 |
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