CN106998138B - Bidirectional DC-DC converter without Pressure and Control - Google Patents
Bidirectional DC-DC converter without Pressure and Control Download PDFInfo
- Publication number
- CN106998138B CN106998138B CN201610047396.4A CN201610047396A CN106998138B CN 106998138 B CN106998138 B CN 106998138B CN 201610047396 A CN201610047396 A CN 201610047396A CN 106998138 B CN106998138 B CN 106998138B
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- submodule
- port
- bridge
- converter
- cathode
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The present invention provides the two-way DC--DC converter for being not necessarily to Pressure and Control.The two-way DC--DC converter is constructed by multiple DC-AC converters based on modularization multi-level converter (MMC).The modularization multi-level converter can clamp DC side failure, also can conveniently realize the unidirectional 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 can guarantee the way traffic of converter.Two-way DC--DC converter without Pressure and Control relies on the auxiliary capacitor of internal configuration, auxiliary IGBT module, clamp diode can be on the basis of two-way DC--DC converter realizes that DC voltage is converted, 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 bidirectional DC-DC converter without Pressure and Control.
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 bidirectional DC-DC converter of Pressure and Control, the DC-AC converter being made of modularization multi-level converter is handed over
The output of stream side is connected directly.
The above-mentioned bidirectional DC-DC converter without Pressure and Control, in DC-AC converter, first auxiliary capacitor anode connects
Auxiliary IGBT module is connect, 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, B Xiang Yougai in DC-AC converter
Half-bridge submodule, single clamp submodule, full-bridge submodule after making are combined with clamp diode.
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 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 bidirectional DC-DC converter of Pressure and Control, the DC-AC being made of modularization multi-level converter
Converter exchange side output is connected directly.
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 bidirectional DC-DC converter of Pressure and Control, it is characterised in that: the DC- being made of modularization multi-level converter
AC converter exchange side output is connected directly, in DC-AC converter, auxiliary capacitor C1Anode is through node Na_03Connection auxiliary IGBT
Module T1Collector, cathode is through node Nb_03Connect clamp diode D1Anode is bridged with bridge arm in A, B phase of latter three composition
Circuit passes through T1Emitter and D1Cathode is incorporated to DC bus anode；Auxiliary capacitor C2Cathode is through node Nb_(2n+1)3Connection auxiliary
IGBT module T2Emitter, anode is through node Na_(2n+1)3Connect clamp diode D2Cathode, with bridge under A, B phase of latter three composition
Arm bridges circuit, passes through T2Collector and D2Anode is incorporated to DC bus cathode, and wherein n is natural number；A in DC-AC converter
Phase, B phase are combined by improved half-bridge submodule, single clamp submodule, full-bridge submodule with clamp diode, wherein changing
There are three ports for bridge arm submodule after making；For i-th of bridge arm submodule SM in A phasei, wherein the value of i is 1~2n,
When the bridge arm submodule is improved half-bridge submodule, port Na_i1It connects in half-bridge submodule in two IGBT modules
Point, port Na_i2Connexon module capacitance Ca_iCathode, port Na_i3Through mechanical switch connexon module capacitance Ca_iAnode；The bridge
It is single to clamp diode connexon module capacitance C in submodule when arm submodule is improved single clamp submodulea_iAnode, together
When port Na_i1The midpoint of two IGBT modules, port N in the single clamp submodule of connectiona_i2Two poles in the single clamp submodule of connection
Pipe and IGBT module tie-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 one group of full-bridge submodule
The midpoint of interior two IGBT modules, port Na_i2Connect the midpoint of two IGBT modules in another group of full-bridge submodule, port Na_i3
Connect additional IGBT module emitter and through additional IGBT module collector connexon module capacitance Ca_iAnode；Port Na_(k+1)1
Port N is connected to through conducting wire or bridge arm reactor upwardsa_k2, port Na_(k+1)3Through connection clamper diode cathode and through clamper two
Pole pipe cathode is connected upwardly 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 which is improved half-bridge submodule, port Nb_i1Connexon module capacitance Cb_iJust
Pole, port Nb_i2Connect the midpoint of two IGBT modules in half-bridge submodule, port Nb_i3Through mechanical switch connexon module capacitance
Cb_iCathode；It is single to clamp diode connection submodule electricity in submodule when the bridge arm submodule is improved single clamp submodule
Hold Cb_iCathode, while port Nb_i1The tie-point of IGBT module and diode, port N in the single clamp submodule of connectionb_i2Connection
The midpoint of two IGBT modules, port N in single clamp submoduleb_i3Connect additional IGBT module emitter and through additional IGBT mould
Block collector connexon module capacitance Cb_iCathode；When the bridge arm submodule is improved full-bridge submodule, port Nb_i1Connection
The midpoint of two IGBT modules, port N in one group of full-bridge submoduleb_i2Connect two IGBT modules in another group of full-bridge submodule
Midpoint, port Nb_i3Connect additional IGBT module emitter and through additional IGBT module collector connexon module capacitance Cb_i
Cathode；Port Nb_(k+1)1Port N is connected to through conducting wire or bridge arm reactor upwardsb_k2, port Nb_(k+1)3Through connecting two pole of clamper
Pipe anode is simultaneously connected upwardly to port N through clamp diode cathodeb_k3, wherein the value of k is 0~2n.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610047396.4A CN106998138B (en) | 2016-01-25 | 2016-01-25 | Bidirectional DC-DC converter without Pressure and Control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610047396.4A CN106998138B (en) | 2016-01-25 | 2016-01-25 | Bidirectional DC-DC converter without Pressure and Control |
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| Publication Number | Publication Date |
|---|---|
| CN106998138A CN106998138A (en) | 2017-08-01 |
| CN106998138B true CN106998138B (en) | 2019-07-05 |
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| CN201610047396.4A Active CN106998138B (en) | 2016-01-25 | 2016-01-25 | Bidirectional DC-DC converter without Pressure and Control |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109546882B (en) * | 2018-11-14 | 2020-12-11 | 华北电力大学 | Half-full hybrid MMC based on hybrid full bridge and control method thereof |
| CN112583026A (en) * | 2020-03-16 | 2021-03-30 | 东北林业大学 | MMC-STATCOM novel submodule capacitor voltage bidirectional equalization topology |
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 |
| CN104037733A (en) * | 2014-06-03 | 2014-09-10 | 中国科学院电工研究所 | Direct current fault isolation type flexible direct current transmission converter station subelement topology |
| 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 |
| CN204597805U (en) * | 2015-04-30 | 2015-08-26 | 华南理工大学 | A kind of submodular circuits for block combiner multi-level converter |
| 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 CN201610047396.4A patent/CN106998138B/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 |
| CN104037733A (en) * | 2014-06-03 | 2014-09-10 | 中国科学院电工研究所 | Direct current fault isolation type flexible direct current transmission converter station subelement topology |
| 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 |
| CN204597805U (en) * | 2015-04-30 | 2015-08-26 | 华南理工大学 | A kind of submodular circuits for block combiner multi-level converter |
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| CN106998138A (en) | 2017-08-01 |
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