CN110323930A - A kind of modular multilevel DC solid transformer and failure tolerant method - Google Patents
A kind of modular multilevel DC solid transformer and failure tolerant method Download PDFInfo
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- CN110323930A CN110323930A CN201910726255.9A CN201910726255A CN110323930A CN 110323930 A CN110323930 A CN 110323930A CN 201910726255 A CN201910726255 A CN 201910726255A CN 110323930 A CN110323930 A CN 110323930A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000010363 phase shift Effects 0.000 claims description 15
- 230000005669 field effect Effects 0.000 claims description 10
- 230000009466 transformation Effects 0.000 claims description 6
- 238000012053 enzymatic serum creatinine assay Methods 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 3
- 238000011217 control strategy Methods 0.000 description 9
- 238000002955 isolation Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
-
- 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
- H02M1/0083—Converters characterised by their input or output 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to DC solid transformer, the modularization failure tolerant method of specifically a kind of DC solid transformer that diode is added.The present invention solves the problems, such as some module of Traditional DC solid-state transformer since input side short trouble causes system can not work normally.This method increases diode in input side to select the maximum value of input voltage as the reference voltage of input grading ring, when some module is broken down due to input short in DCSST, system can adjust automatically input grading ring a reference value, to realize that remaining module is pressed, output voltage is made to keep stablizing.The present invention is suitable for DC solid transformer, has good Technical Economy.
Description
Technical field
The present invention relates to commutator transformer field, specifically a kind of modularization event that diode direct-current solid-state transformer is added
Hinder fault-tolerance approach.
Background technique
As the exhaustion of fossil energy and environmental problem are outstanding day by day, the application of various distributed generation resources receives extensive weight
Depending on domestic and foreign scholars have carried out the research of direct-current grid at the same time.In direct-current grid, each distributed generation resource and straight
The DC/DC of large capacity is required between stream bus, between the DC bus of voltage levels and the DC bus of low-voltage-grade
Converter is interconnected.
Since single inverter voltage, current stress are lower, DC/DC module input series and output parallel will be standardized
(input-series output-parallel, ISOP) is suitable for the Width funtion ratio of gains, high power DC transformation occasion
Primary solutions.The control key of the commutator transformer of ISOP combination is to decouple output voltage and input pressure,
Guarantee equilibrium and the output voltage stabilization of input voltage simultaneously.There is document to press and output voltage by deriving input at this stage
Loop equation proposes double close-loop decoupling control strategy and output voltage is made to keep stablizing.Also there is document to simplify control plan simultaneously
Slightly, but modular control mode is not proposed for the architectural characteristic of system modular, be unfavorable for the mould of DC solid transformer
Blockization extension.There is scholar to propose improved novel modularized control strategy simultaneously.The efficiency of converter can be improved simultaneously and move
State property energy.Although proposing the modularity control strategy of commutator transformer, do not consider that input short occurs for commutator transformer
The validity of mentioned control strategy after failure.There is scholar to propose double active phase-shifting transformer sides based on switching capacity access
Case, may be implemented the Rapid matching of voltage, while when the short trouble of DC side occurs, can be not added independent switch it
Under, rapidly Fault Isolation, after failure vanishes, restore to work normally.But it needs to increase switching capacity to handle event
Barrier, design cost increase.Therefore, DC solid transformer control strategy at this stage has the shortcomings that many.
Summary of the invention
The present invention in order to solve Traditional DC solid-state transformer (DC solid state transformer, DCSST) certain
It the problem of a module causes system can not work normally due to input side short trouble, for the defect of existing control strategy, mentions
A kind of modularization failure tolerant method of DC solid transformer that diode is added is gone out.
A kind of modular multilevel DC solid transformer of the present invention adopts the following technical scheme that realization: one
Kind modular multilevel DC solid transformer has including m by the double of input series and output parallel structure (ISOP) connection
Source full-bridge converter (DAB), double active full-bridge converters include high frequency transformer and to be connected to high frequency transformer former and deputy
Two full-bridge circuits on side, each full-bridge circuit include four field-effect tube, each field-effect tube inverse parallel one two
Pole pipe；The input side of each double active full-bridge converters is all connected with a diode；
It further include DSP, driving circuit and voltage acquisition module；Corresponding each field-effect tube is furnished with a driving circuit, corresponding every
A double active full-bridge converters are furnished with a voltage acquisition module；The driving signal output end of DSP is connected with each driving circuit
It connects, the corresponding field-effect tube driving pin of the output end of each driving circuit is connected；Each voltage acquisition module it is defeated
Connection is connected with the outlet side of DAB simultaneously after entering the input side diode of end and corresponding double active full-bridge converters, is used to
Acquisition input voltage and output voltage, the output end of each voltage acquisition module are connected with the voltage input end of DSP.
The present invention also provides a kind of for the above-mentioned modularization failure tolerant method based on DC solid transformer, described
Method is as follows:
Modularization failure tolerant method increases diode in input equalizing busbar input side to select each double active full-bridge transformation
The maximum value of device (DAB) input voltage, as the reference voltage of input grading ring, when modular multilevel DC solid transformer
In some double active full-bridge converter due to input short and when breaking down, system can adjust automatically input grading ring reference
Value makes output voltage keep stablizing to realize that remaining double active full-bridge converter is pressed.
Further, the fault-tolerance approach is specific as follows: in input grading ring, selecting each double active full-bridge converters defeated
Enter the maximum value of voltage, and using maximum value as the reference signal of input grading ring；The reference voltage is as pressure reference value
After making difference with the input voltage value of each double active full-bridge converters, obtains output phase shift and compare revise signal；
In output-voltage loop, output voltage reference valueU orefWith the output voltage actual value of each double active full-bridge convertersU outi
After making difference, the basic shifting ratioing signal of each double active full-bridge converters is obtained；Wherein output voltage reference valueU orefFor setting
Good threshold value；
Each basic shifting ratioing signal of output becomes with corresponding phase shift than respectively obtaining each pair of active full-bridge after revise signal work difference
The final shifting ratioing signal of parallel operation exports pulse PWM drive signal finally by phase shift block, and then active by adjusting each pair
The phase shift block of full-bridge converter adjusts output power, makes double active full-bridge converter output powers that input voltage is high, defeated
It is small to enter the low double active full-bridge converter output powers of voltage, is finally reached the purpose that input is pressed；In system operation,
When some double active full-bridge converter is broken down due to input short, in order to make remaining double active full-bridge converters can be with
It works on, by selecting input voltage maximum value, system can input the reference value of grading ring with adjust automatically, so that its
The active full-bridge converter of Yu Shuan can operate normally.
Above-mentioned a kind of modularization failure tolerant method based on DC solid transformer provided by the present invention, with existing skill
Art is compared, possessed advantage and have the active effect that when in modular multilevel DC solid transformer some module due to
Input short and when breaking down, system can a reference value of adjust automatically input grading ring make to realize that remaining module is pressed
Output voltage keeps stablizing.Improve the reliability of modular multilevel DC solid transformer.
Detailed description of the invention
Fig. 1 is a kind of structure chart of DC solid transformer involved in the present invention；
Fig. 2 is double active full-bridge converter structure charts involved in the present invention；
Fig. 3 is the modularity control block diagram of the DC solid transformer involved in the present invention with failure tolerant function；
In Fig. 1: DC solid transformer passes through input series and output parallel (ISOP) by m double active full-bridge converters (DAB)
Structure connection.U inWithU outRespectively represent commutator transformer input and output busbar voltage；i inWithi outRespectively commutator transformer is defeated
Enter and export electric current；i iniWithi outiThe respectively electric current of each DAB input and output side；U iniWithU outiFor each DAB input and output
The voltage of side.Wherein: i=1,2 ..., m.
In Fig. 2: C1 and C2 is each module input capacitance and output capacitance.T is high frequency transformer, former and deputy side point
It is not connect with full-bridge circuit H1, H2, high frequency transformer provides the function of electrical isolation and voltage transformation, and auxiliary induction provides temporary
State energy stores function, each field-effect tube (MOSFET) inverse parallel on bridge arm a diode, be the double of energy
Access is provided to flowing.U1, U2 are respectively the input and output voltage value of each module (DAB)；i LFor high frequency transformer primary side
Electric current, ULTo assist inductive drop, Up, Us are respectively the former and deputy polygonal voltage of high frequency transformer.
In Fig. 3:U orefFor DCSST output voltage reference value.G sc、G dcRespectively input the PI of grading ring and output-voltage loop
Adjuster.DiFor phase shift ratio.U inWithU outRespectively represent commutator transformer input and output busbar voltage；i inWithi outRespectively direct current
Transformer outputs and inputs electric current；i iniWithi outiThe respectively electric current of each DAB input and output side；U iniWithU outiFor each DAB
The voltage of input and output side.Wherein: i=1,2 ..., m.Phase shift block produces the drive waveforms after MOSFET phase shift.Input is equal
In pressure ring, the input voltage value of reference value and modules is pressedU iniAfter making difference, by PI controller GscPhase shift is exported than amendment
Signal.In output-voltage loop, output voltage reference valueU orefWith output voltage actual valueU outiIt (is represented as in figure after making differenceU out, because modulesU outiIt is all the same), by PI controller GdcOutput is basic to move ratioing signal, repairs with each phase shift ratio
Positive signal obtains the final shifting ratioing signal of each module after making differenceD i, finally by phase-shift controller output pulse PWM driving letter
Number.G sc、G dcAnd phase shift block is realized by DSP.
Specific embodiment
A kind of modular multilevel DC solid transformer passes through input series connection by m double active full-bridge converters (DAB)
The connection of output-parallel (ISOP) structure.Increase diode in the input side of each DAB to select the maximum value of input voltage simultaneously.
Each DAB is as shown in Figure 2, is connect respectively with full-bridge circuit H1, H2 by high frequency transformer on its former and deputy side, high frequency transformer
The function of electrical isolation and voltage transformation is provided, auxiliary induction provides transient state energy store function, each field effect on bridge arm
Should manage (MOSFET) all inverse parallels a diode, provide access for the two-way flow of energy.C1 and C2 is each module
Input capacitance and output capacitance.Each full-bridge is made of the CAS120M12BM2 type SiC MOSFET module of 4 CREE companies.
DSP just can control opening for SiC MOSFET power module after using FM28335, the pwm signal of output to convert by driving circuit
Logical and shutdown.The CGD15HB62P1 type SiC MOSFET gate-drive module that driving circuit selects CREE company to release, DSP's
11,15 pin output drive signals are separately connected 2, No. 10 pins of driving plate.The input voltage of each DAB passes through connection simultaneously
Diode selecting maximum input voltage, and be entered into DSP and carry out processing output drive signal, and then control MOSFET's
Switch motion reaches the requirement of the design.
Modularization failure tolerant method increases diode in input equalizing busbar input side to select the maximum of input voltage
Value occurs due to inputting grading ring reference value in Traditional control strategy in some module as the reference voltage of input grading ring
It needs to readjust when input short failure, so Novel Control chooses module by increasing maximum value, selects each module
The maximum value of input voltage, and using maximum value as the reference signal of input grading ring.By the input voltage of each module with
It inputs the reference signal pressed to make the difference, difference is added to the output valve of each module output-voltage loop later.And then pass through adjusting
Each module phase shift block adjusts output power, makes the module output power that input voltage is high, the low module output of input voltage
Power is small, is finally reached the purpose that input is pressed.In system operation, when event occurs due to input short for some module
When barrier, in order to allow remaining module to work on, the Novel Control of proposition passes through selection input voltage maximum value, system
The reliable of system can be improved so that remaining module can operate normally with the reference value that adjust automatically inputs grading ring
Property.On the basis of modularity control strategy, increases maximum value and choose module, obtain the modularization DCSST with fault tolerance
Control strategy, when some module is broken down due to input short in DCSST, system can adjust automatically input grading ring
A reference value makes output voltage keep stablizing to realize that remaining module is pressed.As shown in Figure 3.
Claims (4)
1. a kind of modular multilevel DC solid transformer, which is characterized in that pass through input series and output parallel knot including m
Double active full-bridge converters of structure connection, double active full-bridge converters include high frequency transformer and are connected to high frequency transformation
Two full-bridge circuits on the former and deputy side of device, each full-bridge circuit include four field-effect tube, each field-effect tube inverse parallel
A diode；The input side of each double active full-bridge converters is all connected with a diode；
It further include DSP, driving circuit and voltage acquisition module；Corresponding each field-effect tube is furnished with a driving circuit, corresponding every
A double active full-bridge converters are furnished with a voltage acquisition module；The driving signal output end of DSP is connected with each driving circuit
It connects, the corresponding field-effect tube driving pin of the output end of each driving circuit is connected；Each voltage acquisition module it is defeated
The input side diode for entering end and corresponding double active full-bridge converters connects the output with double active full-bridge converters simultaneously later
Side is connected, for acquiring input voltage and output voltage, the output end of each voltage acquisition module and the voltage input end of DSP
It is connected.
2. a kind of modular multilevel DC solid transformer as described in claim 1, which is characterized in that each full-bridge is by 4
The CAS120M12BM2 type SiC MOSFET module of a CREE company forms；Driving circuit selects CREE company to release
CGD15HB62P1 type SiC MOSFET gate-drive module；DSP uses FM28335, and the pwm signal of output passes through driving circuit
It can control turning on and off for SiC MOSFET power module after transformation；The 11 of DSP, 15 pin output drive signals are separately connected
The 2 of driving circuit, No. 10 pins.
3. a kind of modularization failure tolerant method of modular multilevel DC solid transformer, it is characterised in that: equal in input
Pressure bus input side increases diode to select the maximum value of each double active full-bridge converter input voltages, presses as input
The reference voltage of ring, when the double active full-bridge converters of some in modular multilevel DC solid transformer due to input short and
When breaking down, system can adjust automatically input grading ring reference value, to realize that remaining double active full-bridge converter is pressed,
Output voltage is set to keep stablizing.
4. a kind of modularization failure tolerant method of modular multilevel DC solid transformer as claimed in claim 3,
Be characterized in that: the fault-tolerance approach is specific as follows: in input grading ring, selecting each double active full-bridge converter input voltages
Maximum value, and using maximum value as the reference signal of input grading ring；The reference voltage is as pressure reference value and each pair
After the input voltage value of active full-bridge converter makees difference, obtains output phase shift and compare revise signal；
In output-voltage loop, output voltage reference valueU orefWith the output voltage actual value of each double active full-bridge convertersU outi
After making difference, the basic shifting ratioing signal of each double active full-bridge converters is obtained；Wherein output voltage reference valueU orefFor setting
Good threshold value；
Each basic shifting ratioing signal of output becomes with corresponding phase shift than respectively obtaining each pair of active full-bridge after revise signal work difference
The final shifting ratioing signal of parallel operation exports pulse PWM drive signal finally by phase shift block, and then active by adjusting each pair
The phase shift block of full-bridge converter adjusts output power, makes double active full-bridge converter output powers that input voltage is high, defeated
It is small to enter the low double active full-bridge converter output powers of voltage, is finally reached the purpose that input is pressed；In system operation,
When some double active full-bridge converter is broken down due to input short, in order to make remaining double active full-bridge converters can be with
It works on, by selecting input voltage maximum value, system can input the reference value of grading ring with adjust automatically, so that its
The active full-bridge converter of Yu Shuan can operate normally.
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| CN201910726255.9A CN110323930B (en) | 2019-08-07 | 2019-08-07 | Modularized multi-level direct current solid-state transformer and fault tolerance method |
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| CN113193752A (en) * | 2021-04-20 | 2021-07-30 | 华中科技大学 | DC transformer input voltage balance control method based on model prediction |
| CN113972818A (en) * | 2021-09-27 | 2022-01-25 | 国网江苏省电力有限公司电力科学研究院 | Fault-tolerant operation method and device under modular multilevel converter submodule fault |
| CN114448261A (en) * | 2022-02-10 | 2022-05-06 | 上海交通大学 | Dual-input semi-active bridge converter with port short-circuit fault-tolerant operation capability |
| CN114448261B (en) * | 2022-02-10 | 2024-06-07 | 上海交通大学 | Dual input semi-active bridge converter with port short circuit fault tolerant operation capability |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113972818A (en) * | 2021-09-27 | 2022-01-25 | 国网江苏省电力有限公司电力科学研究院 | Fault-tolerant operation method and device under modular multilevel converter submodule fault |
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| CN114448261B (en) * | 2022-02-10 | 2024-06-07 | 上海交通大学 | Dual input semi-active bridge converter with port short circuit fault tolerant operation capability |
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| CN110323930B (en) | 2024-02-02 |
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