CN106787861B - Modular multilevel full-bridge mode of resonance electric power electric transformer topology - Google Patents
Modular multilevel full-bridge mode of resonance electric power electric transformer topology Download PDFInfo
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- CN106787861B CN106787861B CN201710033847.3A CN201710033847A CN106787861B CN 106787861 B CN106787861 B CN 106787861B CN 201710033847 A CN201710033847 A CN 201710033847A CN 106787861 B CN106787861 B CN 106787861B
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention belongs to power electronics field more particularly to a kind of modular multilevel full-bridge mode of resonance electric power electric transformer topologys, specifically include the high-pressure side three-phase of three-phase star binding structure, and every phase structure is identical, and every phase includes NtA subelement and NtA low-pressure side full-bridge modules；Each subelement includes a resonance LC, a high frequency transformer, every phaseHigh-pressure side MMC full-bridge modules；In two adjacent subelements, MMC module respectively generates the output of a part of fundamental frequency phase voltage, while producing that amplitude is equal, high frequency square wave of opposite in phase, and high frequency square wave passes through through bridge arm resonance LC screening, again after high frequency transformer isolated buck, rectified by low-pressure side H bridge module to low-voltage direct bus.This topology can save high frequency transformer number, number of modules, capacitor number and switch number compared to the high-pressure side of conventional electric power electronic transformer and intergrade topology, while have good output waveform.
Description
Technical field
The invention belongs to power electronics field more particularly to a kind of modular multilevel full-bridge mode of resonance power electronics
Transformer topology.
Background technique
Electric power electric transformer has the function of voltage transformation, reactive compensation, unbalance control, power quality controlling etc.
Power electronic equipment.There are many power electronics transformation topology type, common are AC/AC type, AC/DC/DC type and AC/DC/DC/AC
Type.AC/AC type topology belongs to matrix type structure, and the degree of coupling between bridge arm is higher, influences output waveform quality；AC/DC/DC
There is type capacitor to realize uncoupling, and output waveform quality is preferable, meanwhile, it is female that this topology is capable of providing high pressure, low-voltage direct
Line facilitates power grid to interconnect；AC/DC/DC/AC type joined low-voltage direct side inversion link on the basis of AC/DC/DC type, separately may be used
Realize the ac-ac conversion function of traditional transformer.
Electric power electric transformer is relative to traditional transformer, and structure is complicated, and component type, quantity are various, power density
Lower, overall cost is high.The lower AC/AC type of series is difficult to ensure good waveforms, grade in above-mentioned electric power electric transformer structure
Structure is complicated for the more AC/DC/DC/AC type of number.
How not to influence electric power electric transformer output waveform or output waveform is influenced to simplify electricity in lesser situation
Power electronic transformer structure reduces electric power electric transformer number of devices, improves power density, reduces cost, to promotion electric power
Electronic transformer application is of great significance.
Summary of the invention
In view of the above-mentioned problems, the present invention proposes a kind of modular multilevel full-bridge mode of resonance electric power electric transformer topology,
It includes the high-pressure side three-phase of three-phase star binding structure, and every phase structure is identical, and every phase includes NtA subelement and NtA low-pressure side full-bridge
Module；
Each subelement includes a resonance LC, a high frequency transformer, every phaseHigh-pressure side MMC full-bridge modules；Often
A high-pressure side MMC full-bridge modules include 2 terminals Ps 1 and P2；A high-pressure side MMC module-cascade i.e. high pressure inside subelement
The P1 terminal of side MMC full-bridge modules is connect with the P2 terminal of another high-pressure side MMC full-bridge modules, top layer's high pressure in subelement
The P1 terminal of side MMC full-bridge modules and the P2 terminal of lowest level high-pressure side MMC full-bridge modules constitute external two of subelement
Terminals P 1, P2；
The P1 terminal series-shunt high-pressure side filter inductance L of every phase top layer subelementfAfterwards formed Po terminal, Po terminal with it is corresponding
The connection of phase power grid, the P2 terminal of every phase lowest level subelement are referred to as Pn terminal, and three-phase Pn terminal is connected to a bit, constitutes star-like knot
Structure；
It is former that the resonance LC is series at the P1 terminal of top layer high-pressure side MMC full-bridge modules and high frequency transformer in subelement
Between side；
The high frequency transformer, one terminal of primary side are connect with resonance LC, lowest level in another terminal and subelement
The P2 terminal of high-pressure side full-bridge MMC module connects, and secondary side two-terminal connects with the terminals P 3 of low-pressure side full-bridge modules, P4 respectively
It connects；
The low-pressure side full-bridge modules, each low-pressure side full-bridge modules include 4 terminals Ps 3, P4, Pu, Pd, the end P3, P4
Son high frequency transformer pair side end that connect with high frequency transformer pair side two-terminal, and connect with P3 and high frequency transformer primary side and
The terminal of resonance LC connection is Same Name of Ends；The Pu of all low-pressure side full-bridge modules connects the positive bus-bar to form low-voltage direct bus,
The Pd of all low-pressure side full-bridge modules connects the negative busbar to form low-voltage direct bus.
The high-pressure side MMC full-bridge modules are single-phase full bridge structure, include 4 IGBT and 1 capacitors.
The resonance LC is by 1 resonant inductance LHWith 1 resonant capacitance CHIt is connected in series.
The high frequency transformer is two-winding transformer.
The low-pressure side full-bridge modules are single-phase full bridge structure, include 4 IGBT and 1 capacitors.
Two adjacent subelements export in every phaseFundamental frequency phase voltage, and the two subelements output high frequency side
Wave amplitude is identical, opposite in phase, guarantees that output phase voltage medium-high frequency square-wave voltage is cancelled out each other.
Between the original identical each subelement of output square wave phase, setting output square wavePhase shift reduces high pressure
Side is delivered to the power swing on low-voltage direct bus, exports between the opposite subelement of square wave phase, no longer adds this part
Phase shift.
The calculation method of high-pressure side MMC full-bridge modules number N in the subelement are as follows: each MMC full-bridge modules it is specified
Voltage is Ucr, each full-bridge MMC module exports (1- δ) U simultaneouslycrThe fundamental frequency voltages and δ U of amplitudecrThe high frequency square wave electricity of amplitude
Pressure, δ are high frequency square wave voltage percentage, and δ < 1；It is defeated in order to guarantee to exchange required phase voltage with high-voltage alternating system power
Amplitude is U outp, then the high-pressure side MMC full-bridge modules number in subelementHigh-pressure side MMC full-bridge modules；δ
Ucr × N is the high frequency square wave voltage amplitude of every high frequency transformer primary side input, should be equal to the specified electricity of high frequency transformer primary side
Pressure, obtains the value of δ.
The high-pressure side MMC full-bridge modules, its modulating wave is after considering module uniform voltage function
Function
Wherein UmBefore considering module uniform voltage function, the modulation wave signal of high-pressure side MMC full-bridge modules, P is that module is equal
Voltage-controlled proportionality coefficient processed, IlegFor the electric current for flowing into the subelement, reference direction is directed toward electric power electric transformer, U by power gridcx
For x-th of high-pressure side MMC full-bridge modules capacitance voltage actual value, UcrFor module voltage reference value；The modulating wave root of modules
Be modified according to the difference of module selfcapacity voltage and reference voltage, guarantee subelement inside modules voltage differences compared with
It is small.
Beneficial effect
A kind of modular multilevel full-bridge mode of resonance electric power electric transformer topology proposed by the present invention belongs to AC/DC type and opens up
It flutters, can be realized friendship-and directly convert, the degree of coupling is lower, and output waveform is good, and is capable of providing low-voltage direct bus, if in low pressure
DC side increases inversion link, it can be achieved that straight-friendship mapping function.Advantage of the invention is can to reduce number of modules, reduces switch
Number saves capacitor, and the complexity of simplified control device hardware reduces electric power electric transformer manufacturing cost, and it is close to improve power
Degree.
Detailed description of the invention
Fig. 1 is modular multilevel full-bridge mode of resonance electric power electric transformer topological diagram.
Fig. 2 is high-pressure side MMC full-bridge modules structure chart.
Fig. 3 is low-pressure side full-bridge modules structure chart.
Fig. 4 is the AC/DC/DC type electric power electric transformer topology of dual star topology connection.
Fig. 5 is high voltage side current PSCAD simulation waveform when present invention topology is loaded with 125kW.
Fig. 6 is low-voltage direct busbar voltage PSCAD simulation waveform when present invention topology is loaded with 125kW.
Wherein: the every phase bridge arm in high-pressure side and high-voltage fence tie point Po, three-phase bridge arm points of common connection Pn, low-pressure side are honest
Flow bus DC+ and low-pressure side full-bridge modules tie point Pu, the negative DC bus DC- of low-pressure side and low-pressure side full-bridge modules tie point
Pd, the upper and lower IGBT tie point P1 in high-pressure side MMC full-bridge modules left side, the upper and lower IGBT tie point in high-pressure side MMC full-bridge modules right side
P2, the upper and lower IGBT tie point P3 in low-pressure side full-bridge modules left side, the upper and lower IGBT tie point P4 in low-pressure side full-bridge modules right side, resonance
Inductance LH, resonant capacitance CH, filter inductance Lf, three-phase power grid voltage Usa、Usb、Usc, subelement electric current Ileg, low-voltage direct bus
Capacitor CL。
Specific embodiment
The invention proposes a kind of modular multilevel full-bridge mode of resonance electric power electric transformer topologys.As shown in Figure 1, packet
The high-pressure side three-phase of three-phase star binding structure is included, every phase structure is identical, and every phase includes NtA subelement and NtA low-pressure side full-bridge mould
Block；Each subelement includes a resonance LC, a high frequency transformer, every phaseHigh-pressure side MMC full-bridge modules；It is each high
Pressing side MMC full-bridge modules includes 2 terminals Ps 1 and P2；A high-pressure side MMC module-cascade i.e. high-pressure side MMC inside subelement
The P1 terminal of full-bridge modules is connect with the P2 terminal of another high-pressure side MMC full-bridge modules, top layer high-pressure side MMC in subelement
The P1 terminal of full-bridge modules and the P2 terminal of lowest level high-pressure side MMC full-bridge modules constitute two external terminals of subelement
P1,P2；The P1 terminal series-shunt high-pressure side filter inductance L of every phase top layer subelementfPo terminal, Po terminal and corresponding phase are formed afterwards
Power grid connection, the P2 terminal of every phase lowest level subelement are referred to as Pn terminal, and three-phase Pn terminal is connected to a bit, constitutes star-like knot
Structure；Resonance LC is series in subelement between the P1 terminal and high frequency transformer primary side of top layer high-pressure side MMC full-bridge modules；It is high
Frequency power transformer, one terminal of primary side are connect with resonance LC, lowest level high-pressure side full-bridge MMC mould in another terminal and subelement
The P2 terminal of block connects, and secondary side two-terminal is connect with the terminals P 3 of low-pressure side full-bridge modules, P4 respectively；Low-pressure side full-bridge mould
Block, each low-pressure side full-bridge modules include 4 terminals Ps 3, P4, Pu, Pd, P3, P4 terminal and high frequency transformer pair side two-terminal
Connection, and the terminal that high frequency transformer pair side end connecting with P3 is connect with high frequency transformer primary side and resonance LC is of the same name
End；The Pu of all low-pressure side full-bridge modules connects the positive bus-bar to form low-voltage direct bus, the Pd of all low-pressure side full-bridge modules
Connection forms the negative busbar of low-voltage direct bus.Resonance LC is by 1 resonant inductance LHWith 1 resonant capacitance CHIt is connected in series, high frequency
Transformer is two-winding transformer.
As shown in Fig. 2, high-pressure side MMC full-bridge modules are single-phase full bridge structure, it include 4 IGBT and 1 capacitors.
As shown in figure 3, low-pressure side full-bridge modules are single-phase full bridge structure, it include 4 IGBT and 1 capacitors.
Two adjacent subelements export in every phaseFundamental frequency phase voltage, and the two subelements output high frequency side
Wave amplitude is identical, opposite in phase, guarantees that output phase voltage medium-high frequency square-wave voltage is cancelled out each other.
Between the original identical each subelement of output square wave phase, setting output square wavePhase shift reduces high pressure
Side is delivered to the power swing on low-voltage direct bus, exports between the opposite subelement of square wave phase, no longer adds this part
Phase shift.
The calculation method of high-pressure side MMC full-bridge modules number N in subelement are as follows: the voltage rating of each MMC full-bridge modules
For Ucr, each full-bridge MMC module exports (1- δ) U simultaneouslycrThe fundamental frequency voltages and δ U of amplitudecrThe high frequency square wave voltage of amplitude, δ are
High frequency square wave voltage percentage, and δ < 1；In order to guarantee to exchange required phase voltage output amplitude with high-voltage alternating system power
For Up, then the high-pressure side MMC full-bridge modules number in subelementHigh-pressure side MMC full-bridge modules；δUcr×N
For the high frequency square wave voltage amplitude of every high frequency transformer primary side input, high frequency transformer primary side voltage rating should be equal to, obtain δ's
Value.
High-pressure side uses full-bridge modules and for star binding structure, and every phase bridge arm bears AC system phase voltage jointly, compared to
The relatively broad dual star topology connection AC/DC/DC type electric power electric transformer topology of research as shown in Figure 4, every mutually upper and lower bridge arm
It is required to bear the operating condition of at least 2 times AC system phase voltages, MMC number of modules can be saved, so that IGBT number and capacitor number are saved,
It is as follows that specific device saves situation calculation method (not considering low-pressure side): if the AC/DC/DC type power electronics of dual star topology connection
Transformer half-bridge MMC number of modules is Nmmc, and the H bridge module number of high-pressure side DC/DC transformation is(high-pressure side H bridge module and
MMC module voltage rating is identical, and in the case where bearing identical high voltage dc bus voltage, high-pressure side H bridge module number, which is equal to, appoints
One bridge arm MMC number of modules), then number of modules is needed altogetherIGBT number is needed altogetherHigh pressure lateral capacitance number is needed altogether It is protecting
Demonstrate,prove electric power electric transformer total capacity, high-pressure side full-bridge MMC module voltage rating, high frequency transformer capacity and voltage rating and figure
In the identical situation of 2 topologys, the corresponding high frequency square wave voltage amplitude of 1 high frequency transformer is equal to 1 high-pressure side MMC full-bridge modules
Voltage, thus this specially topology for generate high-pressure side MMC full-bridge modules number required for high frequency square wave (this number be equivalent number,
Each high-pressure side MMC full-bridge modules still export fundamental frequency alternating voltage and high frequency square wave voltage simultaneously) it is equal to the AC/ of dual star topology connection
DC/DC type electric power electric transformer high-pressure side H bridge number, i.e.,High-pressure side is connect using full-bridge modules and three-phase star, is compared
The AC/DC/DC type electric power electric transformer of dual star topology connection, present invention topology is in order to exchange power needs with High-voltage AC Network
DC voltage reduce 75%, therefore corresponding number of modules also reduces 75%, i.e., only needsNumber of modules, therefore the present invention topology
Need high-pressure side MMC full-bridge modules numberSave number of modules 64.28%；IGBT number is needed altogetherSave IGBT number 37.5%；
High-pressure side full-bridge MMC module capacitance dosage comparison: the present invention in the identical situation of module voltage fluctuation percentage
Topography module capacitor minimum value is Cm1, the AC/DC/DC type topology MMC module capacitance minimum value of dual star topology connection is Cm2, manager
By derivingWhereinFor inverter
Power-factor angle, M are modulation ratio, and k is high frequency square wave in the frequency ratio of fundamental frequency sine, and δ is high frequency square wave voltage percentage (δ
< 1).Consider electric power electric transformer total capacity, high-pressure side full-bridge MMC module voltage rating, high frequency transformer capacity and specified
Under voltage and Fig. 2 topology same case,At this point, being 1 in modulation ratio, electric power electric transformer power-factor angle is 0
In the case of,It is maximized 1.245.According to Such analysis it is found that it is (capacitance and double that topology needs high pressure lateral capacitance number altogether herein
Star-like connection topology it is equal convert into it is equivalent after number)The AC/DC/DC type topology of dual star topology connection needs height
Pressure lateral capacitance number beTopology of the invention saves high pressure lateral capacitance 55.5%.
The above are theoretical calculation, need to consider the physics law and device ginseng that number of modules is necessary integer in Practical Project
Several selections.Number of modules is reduced, and is reduced to controller physical communication interface number demand.Simultaneously because IGBT number, capacitor number are reduced,
Electric power electric transformer manufacturing cost is advantageously reduced, power density is improved.
High-pressure side MMC full-bridge modules, its modulating wave is after considering module uniform voltage function
Function
Wherein UmBefore considering module uniform voltage function, the modulation wave signal of high-pressure side MMC full-bridge modules, P is that module is equal
Voltage-controlled proportionality coefficient processed, IlegFor the electric current for flowing into the subelement, reference direction is directed toward electric power electric transformer, U by power gridcx
For x-th of high-pressure side MMC full-bridge modules capacitance voltage actual value, UcrFor module voltage reference value；The modulating wave root of modules
Be modified according to the difference of module selfcapacity voltage and reference voltage, guarantee subelement inside modules voltage differences compared with
It is small.
Below for AC10kV-DC700V, 125kW electric power electric transformer carries out topological arrangement of the present invention and research more
The AC/DC/DC type electric power electric transformer of extensive dual star topology connection configures comparative illustration (not considering low-pressure side):
Two kinds of topologys are all made of following hardware plan: the IGBT in the MMC full-bridge modules of high-pressure side uses Infineon company
The product F 200R33KF2C of 3300V/200A；Three-phase high-voltage ac phase voltage virtual value is 10kV, high-pressure side MMC full-bridge modules
Voltage rating be 1600V, two kinds of topological high frequency transformer voltage ratings, capacity are equal.
1. the AC/DC/DC type electric power electric transformer topology of dual star topology connection:
Existing Practical Project scheme: the AC/DC/DC type electric power electric transformer topology of dual star topology connection is as shown in Figure 4.
The every phase in the part topology high-voltage dc voltage 1600V, MMC needs 20 submodules, and three-phase needs 60 submodules, the i.e. portion MMC
Divide and needs 20 × 2 × 3=120 IGBT, 60 capacitors (650uF/1600V)；Totally 10 grades of ISOP isolated form DC/DC converter,
I.e. DC/DC converter part needs 4 × 10=40 IGBT, and high-pressure side 650uF/1600V capacitor 10 is only.To sum up, mould is needed altogether
Block 70, IGBT 160, high-pressure side 650uF/1600V capacitor 70.
2. topology of the invention:
Topology of the present invention needs module 25, saves module 64.28%；IGBT totally 100 are needed, IGBT number is saved
37.5%；Needing high-pressure side 650uF/1600V capacitor 32, (this numerical value is to obtain after converting by 650uF capacitance, and take into a method
It is whole), save high pressure lateral capacitance 54.29%.
A kind of engineering practical solution: by the 5th piecewise analysis of specific embodiment can obtain high frequency square wave voltage percentage δ=
40%, every phase full-bridge MMC number of modules is calculated according to phase voltage 8.164kV and δ: 8.165kV ÷ (1-40%) × 1.6kV=
8.505, be rounded for 10 (this number of modules be necessary for even number with guarantee in phase voltage export high frequency square wave voltage cancel out each other, and
It needs to press in a method to be rounded to guarantee to export phase voltage and can reach power grid phase voltage amplitude)；Then three-phase needs 30 submodules total altogether
Need 30 × 4=120 IGBT；Three-phase needs 30 × 1.245 ≈ of 650uF/1600V capacitor 38 altogether.To sum up, present invention topology section
Save number of modules 57.14%；Save IGBT number 25%；Save high-pressure side 650uF/1600V capacitor 45.71%.It can by analyzing above
Know, engineering practical solution and theoretical scheme are caused by number of modules is rounded in the difference saved on device.In different engineerings,
Number of modules caused by rounding increases that degree is different, and the degree increased is smaller, and the device of saving is more.
By being analyzed above as it can be seen that topology of the present invention can effectively reduce electric power electric transformer number of modules, IGBT number, capacitor
Number improves power density to reduce electric power electric transformer manufacturing cost.In addition, the reduction of number of modules can be reduced to control
The demand of device communication port number processed reduces controller design difficulty.
Fig. 5 gives high-voltage alternating side electric current PSCAD simulation waveform of the topology of the invention with 125kW load when.High-pressure side
Current total harmonic distortion rate is less than 1%, in the identical situation of high-pressure side filter inductance value, less than the connection of dual star topology shown in Fig. 4
AC/DC/DC type electric power electric transformer high voltage side current total harmonic distortion factor 1.6%.
Fig. 6 gives low-voltage direct busbar voltage PSCAD simulation waveform of the topology of the invention with 125kW load when.In height
In the case that frequency power transformer is provided with 0.006p.u. copper loss (simulation actual condition transformer loss), DC bus-bar voltage is average
Value 695V, steady-state error 5V (0.71%) under rated power, the AC/DC/DC type power electronics connecting with dual star topology shown in Fig. 4 become
DC bus-bar voltage steady-state error 0.7% is compared under depressor rated power, but difference very little；It is in low-voltage direct bus capacitor
In the case of 9000uF, present invention topology DC bus-bar voltage ripple amplitude is 0.5V (0.071%), is connected with dual star topology shown in Fig. 4
The AC/DC/DC type topology connect is under rated power and low-voltage direct bus capacitor same case, DC bus-bar voltage ripple amplitude
0.25% compares, and ripple is obviously reduced.
To sum up, present invention topology has good output characteristics.
Claims (9)
1. modular multilevel full-bridge mode of resonance electric power electric transformer topology, which is characterized in that the topology includes three-phase star
The high-pressure side three-phase of binding structure, every phase structure is identical, and every phase includes NtA subelement and NtA low-pressure side full-bridge modules；
Each subelement includes a resonance LC, a high frequency transformer, N number of high-pressure side MMC full-bridge modules；Each high-pressure side
MMC full-bridge modules include 2 terminals Ps 1 and P2；A high-pressure side MMC module-cascade i.e. high-pressure side MMC full-bridge inside subelement
The P1 terminal of module is connect with the P2 terminal of another high-pressure side MMC full-bridge modules, top layer high-pressure side MMC full-bridge in subelement
The P1 terminal of module and the P2 terminal of lowest level high-pressure side MMC full-bridge modules constitute two external terminals Ps 1, P2 of subelement；
The P1 terminal series-shunt high-pressure side filter inductance L of every phase top layer subelementfPo terminal is formed afterwards, and Po terminal and corresponding phase are electric
Net connection, the P2 terminal of every phase lowest level subelement are referred to as Pn terminal, and three-phase Pn terminal is connected to a bit, constitute hub-and-spoke configuration；
The resonance LC be series in subelement the P1 terminal of top layer high-pressure side MMC full-bridge modules and high frequency transformer primary side it
Between；
The high frequency transformer, one terminal of primary side are connect with resonance LC, lowest level high pressure in another terminal and subelement
The P2 terminal of side full-bridge MMC module connects, and secondary side two-terminal is connect with the terminals P 3 of low-pressure side full-bridge modules, P4 respectively；
The low-pressure side full-bridge modules, each low-pressure side full-bridge modules include 4 terminals Ps 3, P4, Pu, Pd, P3, P4 terminal with
The connection of high frequency transformer pair side two-terminal, and high frequency transformer pair side end being connect with P3 and high frequency transformer primary side and resonance
The terminal of LC connection is Same Name of Ends；The Pu of all low-pressure side full-bridge modules connects the positive bus-bar to form low-voltage direct bus, owns
The Pd of low-pressure side full-bridge modules connects the negative busbar to form low-voltage direct bus.
2. modular multilevel full-bridge mode of resonance electric power electric transformer topology according to claim 1, which is characterized in that
The high-pressure side MMC full-bridge modules are single-phase full bridge structure, include 4 IGBT and 1 capacitors.
3. modular multilevel full-bridge mode of resonance electric power electric transformer topology according to claim 1, which is characterized in that
The resonance LC is by 1 resonant inductance LHWith 1 resonant capacitance CHIt is connected in series.
4. modular multilevel full-bridge mode of resonance electric power electric transformer topology according to claim 1, which is characterized in that
The high frequency transformer is two-winding transformer.
5. modular multilevel full-bridge mode of resonance electric power electric transformer topology according to claim 1, which is characterized in that
The low-pressure side full-bridge modules are single-phase full bridge structure, include 4 IGBT and 1 capacitors.
6. modular multilevel full-bridge mode of resonance electric power electric transformer topology according to claim 1, which is characterized in that every
Two adjacent subelements respectively export in phaseFundamental frequency phase voltage, and the two subelements output high frequency square wave amplitude phase
Same, opposite in phase guarantees that output phase voltage medium-high frequency square-wave voltage is cancelled out each other.
7. modular multilevel full-bridge mode of resonance electric power electric transformer topology according to claim 1, which is characterized in that
It exports between the original identical each subelement of square wave phase, setting output square wavePhase shift, reduction high-pressure side are delivered to low
The power swing on DC bus is pressed, exports between the opposite subelement of square wave phase, no longer adds this part phase shift.
8. modular multilevel full-bridge mode of resonance electric power electric transformer topology according to claim 1, which is characterized in that institute
State the calculation method of the high-pressure side MMC full-bridge modules number N in subelement are as follows: the voltage rating of each MMC full-bridge modules is Ucr, often
A full-bridge MMC module exports (1- δ) U simultaneouslycrThe fundamental frequency voltages and δ U of amplitudecrThe high frequency square wave voltage of amplitude, δ are high frequency side
Wave voltage percentage, and δ < 1；It is U to guarantee to exchange required phase voltage output amplitude with high-voltage alternating system powerp,
Then the high-pressure side MMC full-bridge modules number in subelement isThe value of δ is acquired by the following conditions in formula: δ
× Ucr × N is that the high frequency square wave voltage amplitude of every high frequency transformer primary side input is equal to high frequency transformer primary side voltage rating.
9. modular multilevel full-bridge mode of resonance electric power electric transformer topology according to claim 1, which is characterized in that institute
High-pressure side MMC full-bridge modules are stated, its modulating wave is after considering module uniform voltage function
Function
Wherein UmBefore considering module uniform voltage function, the modulation wave signal of high-pressure side MMC full-bridge modules, P is module Pressure and Control
Proportionality coefficient, IlegFor the electric current for flowing into the subelement, reference direction is directed toward electric power electric transformer, U by power gridcxIt is x-th
High-pressure side MMC full-bridge modules capacitance voltage actual value, UcrFor the voltage rating of each MMC full-bridge modules；The modulation of modules
Wave is modified according to the difference of module selfcapacity voltage and reference voltage, guarantees modules voltage differences inside subelement
It is smaller.
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| CN107171578B (en) * | 2017-06-22 | 2019-07-30 | 中国科学院电工研究所 | Two Stages type AC-DC electric power electric transformer |
| CN107612407B (en) * | 2017-09-12 | 2020-04-21 | 东南大学 | High-power-density power electronic transformer topological structure and control method thereof |
| CN108306517B (en) * | 2018-01-16 | 2020-05-05 | 东南大学 | Topological structure of two-stage type multi-port power electronic transformer and control method thereof |
| CN108832825B (en) * | 2018-07-06 | 2020-01-24 | 华北电力大学 | High power density's multiport power electronic transformer topology |
| CN111404409A (en) * | 2019-01-03 | 2020-07-10 | 南京南瑞继保工程技术有限公司 | Multi-port power electronic transformer topology based on MMC and control method thereof |
| CN110472265A (en) * | 2019-06-24 | 2019-11-19 | 华北电力大学 | A kind of electro-magnetic transient equivalent modeling method of ISOP type cascade connection type electric power electric transformer |
| CN112701886B (en) * | 2020-12-07 | 2022-03-25 | 齐鲁中科电工先进电磁驱动技术研究院 | Modular energy router, control method, device and medium |
| CN112994471B (en) * | 2021-04-01 | 2022-12-09 | 西安交通大学 | Power electronic transformer based on series full-bridge resonant circuit |
| CN114123823B (en) * | 2021-12-06 | 2023-09-22 | 国网山东省电力公司电力科学研究院 | High-frequency oscillation analysis method and system for common high-frequency alternating-current bus electric energy router |
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