CN106533189A - Power electronic transformer and control method thereof - Google Patents
Power electronic transformer and control method thereof Download PDFInfo
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- CN106533189A CN106533189A CN201611059361.9A CN201611059361A CN106533189A CN 106533189 A CN106533189 A CN 106533189A CN 201611059361 A CN201611059361 A CN 201611059361A CN 106533189 A CN106533189 A CN 106533189A
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
- H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
-
- 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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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
A power electronic transformer consists of a high voltage alternating current stage, a high frequency isolation stage and a low voltage direct current stage. The high voltage alternating current stage includes a full-bridge submodule type modular multilevel converter, the high frequency isolation stage consists of a high frequency transformer and a series resonance capacitor, and the low voltage direct current stage consists of an H-bridge circuit and a direct current energy storage capacitor. Closed-loop feedback control is performed on low voltage direct voltage, and direct voltage output by a low voltage stage to be stable. The modular multilevel converter and the H-bridge circuit form a series resonance circuit through the high frequency converter and the series resonance capacitor of the isolation stage, the modular multilevel converter and the H-bridge circuit generate same-frequency same-phase high frequency square wave voltage, so that a switching device of the H-bridge circuit works in a zero-current turn-off mode, and thus switching loss can be effectively reduced.
Description
Technical field
The present invention relates to a kind of electric power electric transformer of alternating current-direct current mixing field of power distribution and its control method.
Background technology
Increasing distribution type renewable energy, energy storage and consumer electronics DC load is included in Modern power distribution net.
The polymorphic type energy, energy storage and DC load are directly incorporated into DC distribution net and can save substantial amounts of switch-over unit, improve electric energy
Conversion efficiency.Electric power electric transformer typically has the AC and DC port of different electric pressures, for polytype point
The flexible access of the cloth energy, energy storage and load, and the interconnection of AC/DC electrical network.It is except the electricity with traditional transformer
Outside pressure grade transformation and electrical isolation function, also with trend double-direction control, utility power quality control, unit self-protection shield and autodiagnosis
The several functions such as disconnected, communication and information exchange, play not in intelligent grid, energy the Internet and following AC-DC interconnecting power network
Alternative important function, is which realizes transformation of electrical energy and the core apparatus for processing.
In existing electric power electric transformer circuit topology scheme, generally individually it is to unidirectional current by high-voltage alternating rectifying conversion
Pressure, the DC voltage required for then obtained DC voltage conversion.For example, United States Patent (USP) US
5943229th, 101572495 A of Chinese patent CN, 101707443 A of Chinese patent CN, 105680488 A of Chinese patent CN,
Chinese patent CN 103208929 A of 104682728 A and Chinese patent CN etc..
The shortcoming of these existing schemes is to generally comprise AC-DC, direct current-high-frequency ac, high frequency transformer lifting/lowering
Pressure, the level Four transformation of electrical energy of high-frequency ac-direct current, required power model quantity are also more.So as to cause system effectiveness and work(
Rate density is not high, also constrains the large-scale application of electric power electric transformer.
The content of the invention
It is an object of the invention to overcome existing electric power electric transformer to need, through level Four transformation of electrical energy, to cause system to be imitated
The low shortcoming of rate and power density, proposes a kind of electric power electric transformer and its control method.The present invention is only needed to through three-level
Transformation of electrical energy is capable of achieving the transformation of electrical energy between high-voltage alternating and low-voltage direct, and the Sofe Switch of achievable low pressure H-bridge circuit,
The switching loss of circuit can be reduced.
Electric power electric transformer of the present invention is made up of input stage, intergrade and output stage thtee-stage shiplock, and input stage is high pressure
Exchange level, intergrade are high-frequency isolation level, and output stage is low-voltage direct level.Described high-voltage alternating level is by full-bridge submodule pattern
Massing Multilevel Inverters are constituted, and the resonant capacitance that high-frequency isolation level is connected by high frequency transformer and in its former limit is constituted, low frequency
Direct current level is made up of with the DC energy storage electric capacity for being connected in parallel on H bridge DC sides H-bridge circuit.Input stage, intergrade and output stage composition
Tertiary structure correspondence three-level transformation of electrical energy link：High-voltage alternating level realizes industrial frequency AC to the transformation of electrical energy of high-frequency ac, high
Frequency isolation level realizes the lifting of high-frequency ac voltage, and low-voltage direct level realizes high-frequency ac to the transformation of electrical energy of direct current.
Height of the modular multi-level converter of high-voltage alternating level with the H-bridge circuit of low-voltage direct level by high-frequency isolation level
Frequency power transformer constitutes a series resonant circuit with series resonance capacitor.Wherein modular multi-level converter is by three-phase alternating current
Voltage transformation is high frequency square wave voltage, and H-bridge circuit produces the high frequency square wave voltage with modular multi-level converter with frequency homophase.
On the one hand busbar voltage is exported as voltage with low-voltage direct level to the control method of electric power electric transformer of the present invention
Outer loop feedback amount, with modular multi-level converter high-voltage alternating side electric current as current inner loop feedback quantity, carries out lower pair of dq axles and closes
Ring is controlled.Realize that it is controllable that low-voltage dc voltage is stablized by the real component of regulation high-voltage alternating side three-phase current.The opposing party
Face makes modular multi-level converter and low-voltage direct level H bridge export the square-wave voltage of same frequency homophase.Via high frequency transformer
The resonant tank formed with resonant capacitance, can produce the electric current of near sinusoidal in high frequency side.Comprise the following steps that：
(1) high-voltage alternating level modular multi-level converter is using the Double closed-loop of voltage and current side converted based on dq
Method, using low-voltage direct level capacitance voltage as the value of feedback of outer voltage with modular multi-level converter high-voltage alternating side electric current
For current inner loop feedback quantity, specifically include：
(1.1) low-voltage direct level capacitance voltage, high-voltage alternating side three-phase current and three-phase voltage are sampled；
(1.2) by low-voltage direct level capacitance voltage sampled value ucLWith with reference to DC voltage value udc_refIt is compared, after comparing
Voltage difference through Voltage loop PI adjust output as modular multi-level converter d shaft current rings benchmark id_ref；
(1.3) modular multi-level converter AC three-phase current sampled value obtains two, d axles, q axles through dq conversion
Current component igdAnd igd, AC three-phase voltage sampled value through dq conversion obtain d axles, two component of voltage e of q axlesgdAnd egd；
Phase reference used by wherein dq conversion is mutually calculated through lock by three-phase voltage sampled value and is obtained；
(1.4) by the benchmark i of d shaft currents ring obtained aboved_refWith d shaft currents igdIt is compared, the difference after comparing
Adjust through d shaft current rings PI and obtain output id_PI；The reference value of q shaft current rings and q shaft currents are compared, after comparing
Difference through q shaft current rings PI adjust obtain output iq_PI；With the component of voltage e of d axlesgdWith the component of voltage e of q axlesgqFor
Feedforward amount, is individually subtracted the electric current loop output i of d axlesd_PIWith the electric current loop output i of q axlesq_PI, enter after carrying out decoupling computing again
The anti-dq conversion of row obtains modular multi-level converter three-phase alternating voltage reference value uk_ref(k=a, b, c)；
(2) high-voltage alternating level modular multi-level converter calculates each bridge arm reference voltage, and is modulated, concrete to wrap
Include：
(2.1) it is f to generate frequency valueshf, dutycycle be 50% and amplitude be UhfBipolar square wave voltage, by which
As the reference voltage u of modular multi-level converter high frequency output sidehf_ref；
(2.2) the upper and lower bridge arm reference voltage of a, b, c three-phase circuit of modular multi-level converter is according to high frequency output
The reference voltage u of sidehf_refWith cross streams voltage reference value uk_ref, it is calculated；
(2.3) being calculated by the reference voltage of each bridge arm unit of modular multi-level converter needs to throw in each switch periods
The number of modules for entering, and be modulated.
(3) switching device in the H-bridge circuit of low-voltage direct level adopts bipolar modulation, and dutycycle is 50%, and phase place
With modular multi-level converter high frequency output side reference voltage uhf_refIt is identical.
Electric power electric transformer of the present invention and its control method have the characteristics that and advantage：
1. only need to become through exchange-high-frequency ac, high frequency transformer lifting/voltage reducing, high-frequency ac-direct current three-level electric energy
Change.
2. main circuit constitutes a series resonant circuit, and in H-bridge circuit, each switch is operated in zero-current switching mode
Under, reduce switching loss.
3. full-bridge submodule is adopted in modular multi-level converter, and its circuit structure is identical with H-bridge circuit, can carry out
Unified structure is designed.
4. power model quantity effectively can be reduced, it is cost-effective and power density can be improved.
Description of the drawings
Fig. 1 is the circuit theory diagrams of electric power electric transformer of the present invention；
Fig. 2 is electric power electric transformer high-voltage alternating level modular multi-level converter submodular circuits principle of the present invention
Figure；
Fig. 3 is the control block diagram of electric power electric transformer control method of the present invention；
Fig. 4 is the simulation calculation oscillogram of electric power electric transformer medium/high frequency transformer secondary voltage of the present invention and electric current；
Fig. 5 is the simulation calculation oscillogram of electric power electric transformer low-voltage dc voltage of the present invention.
Specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in figure 1, electric power electric transformer main circuit of the present invention is by input stage, intergrade and output stage thtee-stage shiplock group
Into：Input stage is high-voltage alternating level, and intergrade is high-frequency isolation level, and output stage is low-voltage direct level.
Described high-voltage alternating level is made up of full-bridge submodule type modular multi-level converter, and high-frequency isolation level is by high frequency
Transformator HFT and series resonant capacitance C1Composition, low-frequency d level is by H-bridge circuit and DC energy storage electric capacity C1Composition.
As shown in figure 1, the connected mode of the three-level circuit of electric power electric transformer of the present invention is：High-voltage alternating level modularity
The high frequency output terminal of Multilevel Inverters is P1And N1, high frequency output terminals P1With the series resonant capacitance C of high-frequency isolation level1
The primary terminals X of the high frequency transformer HFT of high-frequency isolation level is connected to after series connection1On, high frequency output terminal N1It is connected to high frequency change
The primary terminals Y of depressor HFT1On.The secondary terminal X of high frequency transformer HFT2It is connected to the lead-out terminal of the H bridges of low-voltage direct level
J1On, another secondary terminal Y of high frequency transformer HFT2It is connected to another lead-out terminal K of the H bridges of low-voltage direct level1On.
The modular multi-level converter of high-voltage alternating level is made up of six bridge arm of three-phase, and each bridge arm includes n sub-series
Module and 1 reactor, the number of submodule of connecting are determined by electric pressure and selected power electronic devices level.Such as Fig. 2
Shown, each submodule adopts full-bridge sub-modular structure, constitutes single-phase full bridge by four full-control type power electronic switching devices,
And in one electric capacity of DC side parallel of single-phase full bridge.The reactor inductance value of each bridge arm is identical, is Larm。
High-frequency isolation level is by high frequency transformer HFT and series resonant capacitance C1Constitute.The bridge of modular multi-level converter
Arm reactance constitutes a series resonant tank with the leakage reactance of series resonant capacitance and high frequency transformer.Bridge arm reactance value Larm, electricity
Container capacitance C1With high frequency transformer leakage reactance value LtlMeet relationship below：
Wherein, fhfFor the resonant frequency of series resonant tank, and the operating frequency of high frequency transformer, LtlBecome for high frequency
Depressor leakage reactance value.
Low-voltage direct level is by H-bridge circuit and DC energy storage electric capacity C2Into.As shown in figure 1, H-bridge circuit is by first switch T1,
Two switch T2, the 3rd switch T3, the 4th switch T4, the first diode D1, the second diode D2, the 3rd diode D3, the four or two pole
Pipe D4Composition.Wherein, first switch T1With the first diode D1Inverse parallel, second switch T2With the second diode D2Inverse parallel, the
Three switch T3With the 3rd diode D3Inverse parallel, the 4th switch T4With the 4th diode D4Inverse parallel；First diode D1Positive pole
With the second diode D2Negative pole be connected as H-bridge circuit terminal J1；3rd diode D3Positive pole and the 4th diode D4's
The connected terminal K as H-bridge circuit of negative pole1；First diode D1Negative pole and the 3rd diode D2Negative pole be connected as H bridges
The terminal J of circuit2；3rd diode D3Positive pole and the 4th diode D4Positive pole be connected as H-bridge circuit terminal K2。
The DC side of H-bridge circuit and DC energy storage electric capacity C2It is in parallel.
The control method of electric power electric transformer of the present invention is as follows：
On the one hand, busbar voltage is exported as outer voltage feedback quantity with low-voltage direct level, with modular multi-level converter
High-voltage alternating side electric current is current inner loop feedback quantity, carries out double-closed-loop control under dq axles.By adjusting high-voltage alternating side three-phase electricity
The real component of stream is realizing that it is controllable that low-voltage dc voltage is stablized.
On the other hand, with frequency as fhf, dutycycle be 50%, and amplitude be UhfBipolar square wave voltage be set to mould
Massing Multilevel Inverters high frequency output side reference voltage uhf_ref.Simultaneously with uhf_refIt is low pressure with the square-wave voltage of frequency homophase
The modulation reference wave u of direct current level H-bridge circuitl_ref.H-bridge circuit produces many with high-voltage alternating level modularity after bipolar modulation
Square-wave voltage of the level current transformer high frequency output side with frequency homophase.
Former secondary voltage no-load voltage ratio N of high frequency transformer1:N2Meet relationship below：
N1:N2=Uhf:Udc_ref (2)
Wherein, Udc_refFor low-voltage direct level direct voltage reference value.
Through the resonant tank formed by high frequency transformer and resonant capacitance, the electricity of near sinusoidal can be produced in high frequency side
Stream.
As shown in figure 3, implement process comprising the following steps：
(1) high-voltage alternating level modular multi-level converter is using the Double closed-loop of voltage and current side converted based on dq
Method, using low-voltage direct level capacitance voltage as the value of feedback of outer voltage, the step is specifically included：
(1.1) to low-voltage direct level capacitance voltage ucL, high-voltage alternating side three-phase current ia、ib、icWith three-phase voltage ea、eb、
ecSampled；
(1.2) by the low-voltage direct level capacitance voltage ucLWith with reference to DC voltage udc_refIt is compared, output voltage is poor
Be worth output is adjusted as the benchmark i of modular multi-level converter d shaft current rings through Voltage loop PId_ref；
(1.3) modular multi-level converter AC three-phase current obtains d axles, two electric currents of q axles point through dq conversion
Amount igdAnd igd, AC three-phase voltage through dq conversion obtain d axles, two component of voltage e of q axlesgdAnd egd；Wherein dq converts institute
Mutually calculated through lock by three-phase voltage sampled value with phase reference θ and obtained；
(1.4) by the benchmark i of d shaft currents ring obtained aboved_refWith d shaft currents igdIt is compared, the difference after comparing
Adjust through d shaft current rings PI and obtain output id_PI；The reference value of q shaft current rings and q shaft currents are compared, after comparing
Difference through q shaft current rings PI adjust obtain output iq_PI；With the component of voltage e of d axles and q axlesgdAnd egqFor feedforward amount, divide
The electric current loop output i of d axles and q axles is not deductedd_PIAnd iq_PI, carry out anti-dq conversion after carrying out decoupling computing again and obtain modularity
Multilevel Inverters three-phase alternating voltage reference value ua_ref、ub_ref、uc_ref；
(2) high-voltage alternating level modular multi-level converter calculates each bridge arm reference voltage, and is modulated, and the step has
Body includes：
(2.1) it is f to generate frequency valueshf, dutycycle be 50%, and amplitude be UhfBipolar square wave voltage, by which
As the reference voltage u of modular multi-level converter high frequency output sidehf_ref；
(2.2) the reference voltage u according to high frequency output sidehf_refWith cross streams voltage reference value uk_ref, calculate depanning
The reference voltage of six bridge arm units of massing Multilevel Inverters, specific formula for calculation is：
(2.3) being calculated by the reference voltage of each bridge arm unit of modular multi-level converter needs to throw in each switch periods
The number of modules for entering, and be modulated.
(3) switching device in low-voltage direct level H-bridge circuit adopts bipolar modulation, and dutycycle is 50%, and phase place with
Modular multi-level converter high frequency output side reference voltage uhf_refIt is identical.
Fig. 4 is electric power electric transformer medium/high frequency transformer secondary voltage u of the present inventionxy2With secondary current ixy2Emulation meter
Oscillogram is calculated, Fig. 5 is low-voltage direct side DC voltage.Simulation parameter is：High AC voltage is 10kV, low-voltage dc voltage volume
Definite value is 750V, and each bridge arm of modular multi-level converter of high-voltage alternating level is comprising 6 grades of bridge-type submodule series connection, submodule
Block electric capacity is 4mH, and capacitance voltage rated value is 1600V, and bridge arm reactor is 100 μ H, controls frequency for 10kHz, its high frequency side
Voltage reference value is amplitude 3200V, the 50% dutycycle square wave of bipolarity of frequency 2500Hz.The resonant capacitance of high-frequency isolation level is
60 μ H, high frequency transformer operating frequency are 2.5kHz, 1.6 μ H of transformer leakage inductance.Low-voltage direct level bus capacitor is 3mF.Load
For 1 Ω resistance.From simulation result, the control method of the present invention causes the modular multilevel change in electric power electric transformer
Stream device, high frequency transformer and H-bridge circuit are operated under series resonance mode, and each switch of H-bridge circuit is in zero-current switching
Working method.Meanwhile, the control mode of the present invention can be to low-voltage dc voltage effective control.
Above-mentioned simulation result shows of the invention correct feasible.Analysis can be generalized to high-frequency isolation level and low pressure above
The mode of N number of unit serial or parallel connection of direct current level.
Claims (5)
1. a kind of electric power electric transformer, it is characterised in that：Described electric power electric transformer is by input stage, intergrade and output
Level thtee-stage shiplock composition；Described input stage is high-voltage alternating level, and described intergrade is high-frequency isolation level, described output stage
For low-voltage direct level；Described input stage, intergrade three-level transformation of electrical energy link corresponding with the tertiary structure that output stage is constituted：It is high
Pressure exchange level realizes industrial frequency AC to the transformation of electrical energy of high-frequency ac, and high-frequency isolation level realizes the lifting of high-frequency ac voltage, low
Straightening stream level realizes high-frequency ac to the transformation of electrical energy of direct current；
High-voltage alternating level is made up of full-bridge submodule type modular multi-level converter；High-frequency isolation level is by high frequency transformer HFT
With the resonant capacitance C in its former limit series connection1Composition；Low-voltage direct level is by H-bridge circuit and the DC energy storage for being connected in parallel on H bridge DC sides
Electric capacity C2Composition；Exchange side terminal A, B, C connection mesohigh AC network of modular multi-level converter；High frequency transformer
The terminal X of HFT1With terminal Y1It is connected respectively to the terminals P of modular multi-level converter1With terminal N1, the output of H-bridge circuit
Terminal J1、K1It is connected respectively to the secondary X of high frequency transformer HFT2、Y2。
2. according to the electric power electric transformer described in claim 1, it is characterised in that：The modularity of described high-voltage alternating level is more
Level current transformer is consisted of with series resonance capacitor the high frequency transformer of high-frequency isolation level with the H-bridge circuit of low-voltage direct level
One series resonant circuit；Wherein three-phase alternating voltage is transformed to high frequency square wave voltage, H bridges electricity by modular multi-level converter
Road produces the high frequency square wave voltage with modular multi-level converter with frequency homophase.
3. the control method of the electric power electric transformer described in claim 1, it is characterised in that：Described control method is on the one hand
Busbar voltage is exported as outer voltage feedback quantity with low-voltage direct level, with modular multi-level converter high-voltage alternating side electric current is
Current inner loop feedback quantity, carries out double-closed-loop control under dq axles；By adjusting the real component of high-voltage alternating side three-phase current come real
Existing low-voltage dc voltage stablizes controllable；On the other hand modular multi-level converter is made to export with frequency with low-voltage direct level H bridge
The square-wave voltage of homophase, via the resonant tank that high frequency transformer and resonant capacitance are formed, produces near sinusoidal in high frequency side
Electric current；
Comprise the following steps：
(1) value of feedback of the high-voltage alternating level modular multi-level converter using low-voltage direct level capacitance voltage as outer voltage,
It is with modular multi-level converter high-voltage alternating side electric current as current inner loop feedback quantity, double using the voltage x current converted based on dq
Closed loop control method；
(2) high-voltage alternating level modular multi-level converter calculates each bridge arm reference voltage, and is modulated；
(3) switching device in the H-bridge circuit of low-voltage direct level adopts bipolar modulation, and dutycycle is 50%, and phase place and mould
Massing Multilevel Inverters high frequency output side reference voltage uhf_refIt is identical.
4. according to the control method of the electric power electric transformer described in claim 3, it is characterised in that described step (1) is concrete
Including：
(1.1) low-voltage direct level capacitance voltage, high-voltage alternating side three-phase current and three-phase voltage are sampled；
(1.2) by the low-voltage direct level capacitance voltage ucLWith with reference to DC voltage udc_refIt is compared, output voltage difference Jing
Overvoltage ring PI adjusts output as the benchmark i of modular multi-level converter d shaft current ringsd_ref；
(1.3) modular multi-level converter AC three-phase current obtains d axles, two current component i of q axles through dq conversiongd
And igd, AC three-phase voltage through dq conversion obtain d axles, two component of voltage e of q axlesgdAnd egd；Phase used by wherein dq conversion
Position benchmark is obtained through PLL phaselocked loops by three-phase voltage sampled value；
(1.4) by the benchmark i of d shaft currents ring obtained aboved_refWith d shaft currents igdIt is compared, the difference after comparing is passed through
Decoupling is adjusted with d shaft current rings PI and obtains output id_PI；The reference value of q shaft current rings and q shaft currents are compared, are compared
Difference afterwards is adjusted through q shaft current rings PI and obtains output iq_PI；With the component of voltage e of d axles and q axlesgdAnd egqFor feedforward amount,
It is individually subtracted the component of voltage e of d axlesgdWith the component of voltage e of q axlesgqFor feedforward amount, the electric current loop output of d axles is individually subtracted
id_PIWith the electric current loop output i of q axlesq_PI, carry out anti-dq conversion after carrying out decoupling computing again and obtain modular multi-level converter
Three-phase alternating voltage reference value uk_ref(k=a, b, c).
5. according to the control method of the electric power electric transformer described in claim 3, it is characterised in that：Described step (2) tool
Body includes：
(2.1) it is f to generate frequency valueshf, dutycycle be 50%, and amplitude be UhfBipolar square wave voltage, as
The reference voltage u of modular multi-level converter high frequency output sidehf_ref；
(2.2) the upper and lower bridge arm reference voltage of a, b, c three-phase circuit of modular multi-level converter is according to high frequency output side
Reference voltage uhf_refWith cross streams voltage reference value uk_ref, it is calculated；
(2.3) being calculated by the reference voltage of each bridge arm unit of modular multi-level converter needs what is put in each switch periods
Number of modules, and be modulated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611059361.9A CN106533189A (en) | 2016-11-25 | 2016-11-25 | Power electronic transformer and control method thereof |
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| CN106877690A (en) * | 2017-04-21 | 2017-06-20 | 清华大学 | Multiport current converter for connecting a plurality of alternating current circuit |
| CN107370392A (en) * | 2017-07-05 | 2017-11-21 | 东南大学 | Towards the electric power electric transformer of mesohigh intelligent distribution network |
| CN107623456A (en) * | 2017-09-29 | 2018-01-23 | 东南大学 | Multiport electric power electric transformer topology and its control method based on MMC |
| CN108959780A (en) * | 2018-07-06 | 2018-12-07 | 中国科学院电工研究所 | The big signal simulation model of Monophase electric power electronic transformer |
| CN109149980A (en) * | 2017-06-19 | 2019-01-04 | 华北电力大学 | A kind of change submodule output voltage polar circuit |
| 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 |
| CN112398349A (en) * | 2020-10-19 | 2021-02-23 | 浙江大学 | Alternating current-direct current interconnection isolation type bidirectional DC/AC converter and bidirectional sharing control method thereof |
| CN112600448A (en) * | 2020-12-04 | 2021-04-02 | 河海大学 | Method for designing parameters of low-voltage side rectifier of modular multi-level flat-straight-flow transformer |
| CN112640280A (en) * | 2018-08-27 | 2021-04-09 | 西门子能源全球有限公司 | Multiphase multilevel converter having a control device and a passive frequency filter, and method for controlling a multiphase multilevel converter |
| CN112803789A (en) * | 2021-02-01 | 2021-05-14 | 中科兆和电力技术(山东)有限公司 | Cophase power supply device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877690A (en) * | 2017-04-21 | 2017-06-20 | 清华大学 | Multiport current converter for connecting a plurality of alternating current circuit |
| CN109149980A (en) * | 2017-06-19 | 2019-01-04 | 华北电力大学 | A kind of change submodule output voltage polar circuit |
| CN107370392A (en) * | 2017-07-05 | 2017-11-21 | 东南大学 | Towards the electric power electric transformer of mesohigh intelligent distribution network |
| CN107370392B (en) * | 2017-07-05 | 2019-03-29 | 东南大学 | Electric power electric transformer towards mesohigh intelligent distribution network |
| CN107623456A (en) * | 2017-09-29 | 2018-01-23 | 东南大学 | Multiport electric power electric transformer topology and its control method based on MMC |
| CN108959780B (en) * | 2018-07-06 | 2022-12-20 | 中国科学院电工研究所 | Large signal simulation model of single-phase power electronic transformer |
| CN108959780A (en) * | 2018-07-06 | 2018-12-07 | 中国科学院电工研究所 | The big signal simulation model of Monophase electric power electronic transformer |
| CN112640280A (en) * | 2018-08-27 | 2021-04-09 | 西门子能源全球有限公司 | Multiphase multilevel converter having a control device and a passive frequency filter, and method for controlling a multiphase multilevel converter |
| CN112640280B (en) * | 2018-08-27 | 2024-01-09 | 西门子能源全球有限公司 | Multiphase multistage converter with control device and passive frequency filter and method for controlling multiphase multistage device converter |
| 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 |
| CN112398349A (en) * | 2020-10-19 | 2021-02-23 | 浙江大学 | Alternating current-direct current interconnection isolation type bidirectional DC/AC converter and bidirectional sharing control method thereof |
| CN112600448A (en) * | 2020-12-04 | 2021-04-02 | 河海大学 | Method for designing parameters of low-voltage side rectifier of modular multi-level flat-straight-flow transformer |
| CN112600448B (en) * | 2020-12-04 | 2021-12-03 | 河海大学 | Method for designing parameters of low-voltage side rectifier of modular multi-level flat-straight-flow transformer |
| CN112803789B (en) * | 2021-02-01 | 2022-06-21 | 中科兆和电力技术(山东)有限公司 | Cophase power supply device |
| CN112803789A (en) * | 2021-02-01 | 2021-05-14 | 中科兆和电力技术(山东)有限公司 | Cophase power supply device |
| CN113014105B (en) * | 2021-02-22 | 2022-07-29 | 广东电网有限责任公司 | Control device and method for power electronic transformer |
| CN113014105A (en) * | 2021-02-22 | 2021-06-22 | 广东电网有限责任公司 | Control device and method for power electronic transformer |
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