CN108092518A - Three-level type alternating current-direct current mixes three port electric power electric transformers - Google Patents

Three-level type alternating current-direct current mixes three port electric power electric transformers Download PDF

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Publication number
CN108092518A
CN108092518A CN201711335505.3A CN201711335505A CN108092518A CN 108092518 A CN108092518 A CN 108092518A CN 201711335505 A CN201711335505 A CN 201711335505A CN 108092518 A CN108092518 A CN 108092518A
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frequency
port
terminal
square
converter
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CN108092518B (en
Inventor
李子欣
李耀华
王平
高范强
徐飞
马逊
赵聪
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Institute of Electrical Engineering of CAS
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Institute of Electrical Engineering of CAS
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Classifications

    • 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
    • H02M5/10—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 transformers
    • H02M5/12—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 transformers for conversion of voltage or current amplitude 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
    • 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
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
    • H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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

Abstract

A kind of three-level type alternating current-direct current mixes three port electric power electric transformers, includes three filter inductance LgA、LgBAnd LgC, three cascade converter CCA、CCBAnd CCC, six low frequency blocking condenser CLFB1、CLFB2、CLFB3、CLFB4、CLFB5And CLFB6, three high-frequency isolation transformer THF1、THF2And THF3With a three-phase four-line dc-to-ac converter INV.The three-level type alternating current-direct current mixes three port electric power electric transformer cascade type current transformer CCA、CCBAnd CCCRealize that electric energy is converted by the direct AC/AC of low-frequency ac to high-frequency ac, high-frequency isolation transformer THF1、THF2And THF3Realize the direct AC/AC conversion of the high-frequency ac of electric energy, three-phase four-line dc-to-ac converter INV realizes direct conversion of the high-frequency ac to low-frequency ac and direct current.

Description

Three-level type alternating current-direct current mixes three port electric power electric transformers
Technical field
The present invention relates to a kind of electric power electric transformer, three-level more particularly to a kind of while that there is AC and DC port Type multiport electric power electric transformer.
Background technology
Electric power electric transformer generally passes through electricity as the new electrical equipment in modern intelligent grid and energy internet The mode of power electronic inverter and high-frequency isolation transformer realizes the multiple functions such as electrical isolation, voltage transformation, power transmission.By Electrical isolation is realized in the hundreds of Hz of use to tens of kHz high frequency transformers, therefore electric power electric transformer becomes than traditional power frequency Core material needed for depressor is less.Further, since electric power electric transformer can also provide DC interface, possessing photovoltaic etc. can The renewable sources of energy are directly accessed ability, while can compensate that AC network is idle and harmonic wave, isolate the multiple functions such as former secondary failure, It is with a wide range of applications in fields such as intelligent grid, energy internet, rail transit locomotive tractions.
But for the application of 10kV or higher voltage grade, under current technology scheme, electric power electric transformer Conversion of the multistage power electronic converter to electric energy progress AC/DC, DC/AC or AC/AC is usually required from output is input to.It is more The presence of grade electrical energy transformer has seriously affected the raising of electric power electric transformer system effectiveness, but also system structure is complicated, Power electronic devices is large number of, cost height and poor reliability.For example, it is exported for connection High-voltage AC Network, low-voltage direct Electric power electric transformer for, existing circuit topology is typically passed through multistage converters：Patent of invention CN02139030, CN200910025824, CN200910238441, CN201310016540, CN201410135384 etc. are AC (power frequency)/DC, DC/AC (high frequency) and AC (high frequency)/DC three-level electrical energy transformers are have passed through, and are realized using high frequency transformer Electrical isolation between different port；In addition, the power frequency that electric power electric transformer uses in patent of invention CN201510078708 Transformer, and be electrically connected between two AC ports by VSC, it is impossible to realize the electrical isolation between AC port.
The content of the invention
The purpose of the present invention is intended to overcome existing electric power electric transformer circuit topology from the electric energy for being input to output process It is straight to propose that a kind of three-level type is handed over by the shortcomings of conversion series is more, efficiency is low and semiconductor switch device quantity is more, poor reliability Stream three port electric power electric transformers of mixing.
Three-level type alternating current-direct current of the present invention mixes three port electric power electric transformers, includes three filter inductance LgA、LgBWith LgC, three cascade converter CCA、CCBAnd CCC, six low frequency blocking condenser CLFB1、CLFB2、CLFB3、CLFB4、CLFB5With CLFB6And three high-frequency isolation transformer THF1、THF2And THF3, a three-phase four-line dc-to-ac converter INV and by filter inductance LF1、 LF2、LF3With low-pass filtering capacitance CF1、CF2、CF3The three-phase low-pass filter of composition；The three-level type electric power electric transformer AC port 1 include tri- connection terminals of A, B, C, AC port 2 include tri- connection terminals of a, b, c, DC port include P With two connection terminals of N.Power being capable of the two-way flow between two AC ports and a DC port.
The three-level type alternating current-direct current mixes three filter inductance L in three port electric power electric transformersgA、LgBAnd LgC It is connected respectively to there are one terminal on three connection terminals A, B, C of the three-level type electric power electric transformer AC port 1, Three filter inductance LgA、LgBAnd LgCThe other three terminal respectively as connection terminal T1、T2And T3；Three filter inductance LF1、 LF2And LF3Three connecting pins of the three-level type electric power electric transformer AC port 2 are connected respectively to there are one terminal On sub- a, b, c, three filter inductance LF1、LF2And LF3The other three terminal be connected respectively to the friendship of three-phase four-line dc-to-ac converter INV It flows on side terminal r, s, t；Three cascade converter CCA、CCBAnd CCCBy the identical submodule SM of quantity in exchange side successively It is connected in series composition, three cascade converter CCA、CCBAnd CCCThere is one end to be connected on neutral point M, three cascade connection types become Flow device CCA、CCBAnd CCCOther end be connected respectively to three connection terminal T1、T2、T3On；Three high-frequency isolation transformers THF1、THF2And THF3Primary side winding be connected on neutral point M there are one terminal, high-frequency isolation transformer THFkPrimary side winding is not It is connected to another terminal of neutral point M and low frequency blocking condenser CLFBkTerminal T is connected to after series connectionk, k is subscript herein And k=1,2,3；Three high-frequency isolation transformer THF1、THF2And THF3Vice-side winding be connected to neutral point N there are one terminal On, high-frequency isolation transformer THFkVice-side winding is not attached to another terminal of neutral point N and low frequency blocking condenser CLFBk+3Be connected respectively to after series connection on exchange side terminal r, s, t of three-phase four-line dc-to-ac converter INV, herein k be subscript and k=1, 2,3；Three-phase four-line dc-to-ac converter INV exchanges side terminal n is connected with neutral point N；Low-pass filtering capacitance CF1、CF2And CF3One end point It is not connected on ac terminal a, b, c, CF1、CF2And CF3Other end be connected to three-phase four-line dc-to-ac converter INV exchange side terminal On n.
The three-level type alternating current-direct current mixes three port electric power electric transformers and is converted including three-level converting electric power, that is, cascades Type current transformer CCA、CCBAnd CCCRealize that electric energy is converted by the direct AC/AC of low-frequency ac and high-frequency ac, high-frequency isolation transformer THF1、THF2And THF3Realize electric energy high-frequency ac direct AC/AC conversion, three-phase four-line dc-to-ac converter INV realize simultaneously electric energy by The direct conversion of high-frequency ac and low-frequency ac and direct current.
The three-level type alternating current-direct current mixes the cascade converter CC in three port electric power electric transformersA、CCBAnd CCCThe reference voltages of tetra- bridge arms of reference voltage and three-phase four-line dc-to-ac converter INV determined by following formula：
uCCA=uCCA_convention_control+usquare_HF_CM
uCCB=uCCB_convention_control+usquare_HF_CM
uCCC=uCCC_convention_control+usquare_HF_CM
uINVr=uan_ref+KHFT×usquare_HF_CM
uINVs=ubn_ref+KHFT×usquare_HF_CM
uINVt=ucn_ref+KHFT×usquare_HF_CM
uINVn=0
Wherein, uCCx_convention_controlFor cascade converter CCxPair of traditional capacitance voltage outer shroud+current inner loop Low frequency output voltage after closed-loop control and the Pressure and Control of submodule SM, x=A, B, C；usquare_HF_CMFor cascade connection type unsteady flow Device CCA, CCB and CCCHigh frequency square wave common-mode voltage, the duty cycle of usquare_HF_CM is 50%, frequency fsquare_HF； uan_ref、ubn_refAnd ucn_refRespectively described three-level type electric power electric transformer AC port voltage uan、ubnAnd ucnReference Value；uINVr、uINVs、uINVtAnd uINVnRespectively three-phase four-line dc-to-ac converter INV ac terminals r, s, t and n is compared in its DC side The voltage of point；KHFTFor high-frequency isolation transformer THF1、THF2And THF3Secondary and the ratio of primary side rated voltage.
The three-level type alternating current-direct current is mixed in three port electric power electric transformers, low frequency blocking condenser CLFB1、CLFB2、 CLFB3、CLFB4、CLFB5And CLFB6Cascade converter CC is obstructedA、CCBAnd CCCAnd three-phase four-line dc-to-ac converter INV exchange outputs The low-frequency component of voltage, high frequency square wave common-mode voltage usquare_HF_CMAnd KHFT×usquare_HF_CMBy cascade converter CCA、CCB And CCCElectric energy from high-frequency isolation transformer THF1、THF2And THF3Primary side be transferred to the three-phase four-line dc-to-ac converter INV of secondary；It is low Frequency blocking condenser CLFB1And CLFB4、CLFB2And CLFB5、CLFB3And CLFB6Respectively with high-frequency isolation transformer THF1、THF2And THF3's The resonant frequency of the series resonant circuit of leakage inductance composition is equal to fsquare_HF。
Description of the drawings
Fig. 1 mixes three port electric power electric transformer circuit diagrams for three-level type alternating current-direct current of the present invention；
Fig. 2 mixes three port electric power electric transformer cascade type current transformer CC for three-level type alternating current-direct current of the present inventionA、CCB、 CCC、CCa、CCbAnd CCcA kind of specific implementation circuit diagram of interior submodule SM；
Fig. 3 is that three-level type alternating current-direct current of the present invention mixes the one of three port electric power electric transformer three-phase four-line dc-to-ac converter INV Kind specific implementation circuit diagram.
Specific embodiment
It is further illustrated the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 mixes three port electric power electric transformer circuit diagrams for three-level type alternating current-direct current of the present invention：Three-level of the present invention Type alternating current-direct current three port electric power electric transformers of mixing, which include, includes three filter inductance LgA、LgBAnd LgC, three cascade connection type unsteady flows Device CCA、CCBAnd CCC, six low frequency blocking condenser CLFB1、CLFB2、CLFB3、CLFB4、CLFB5And CLFB6And three high-frequency isolations Transformer THF1、THF2And THF3, three-phase four-line dc-to-ac converter an INV and LF1、LF2、LF3With CF1、CF2、CF3The three-phase low pass of composition Wave filter；The AC port 1 of the three-level type electric power electric transformer includes tri- connection terminals of A, B, C, and AC port 2 wraps Tri- connection terminals of a, b, c are included, DC port includes two connection terminals of P and N；Power can between three ports bidirectional flow It is dynamic.
The three-level type alternating current-direct current mixes three filter inductance L in three port electric power electric transformersgA、LgBAnd LgCPoint It is not connected to there are one terminal on three connection terminals A, B, C, three filter inductance LgA、LgBAnd LgCThe other three terminal point It Zuo Wei not connection terminal T1、T2And T3；Three filter inductance LF1、LF2And LF3Respectively three connection terminals are connected to there are one terminal A, on b, c, three filter inductance LF1、LF2And LF3The other three terminal be connected respectively to the exchange of three-phase four-line dc-to-ac converter INV On side terminal r, s, t；Three cascade converter CCA、CCBAnd CCCIt is gone here and there successively in exchange side by the identical submodule SM of quantity Connection connection composition, three cascade converter CCA、CCBAnd CCCThere is one end to be connected on neutral point M, three cascade connection type unsteady flows Device CCA、CCBAnd CCCOther end be connected respectively to three connection terminal T1、T2、T3On；Three high-frequency isolation transformer THF1、 THF2And THF3Primary side winding be connected on neutral point M there are one terminal, high-frequency isolation transformer THFkPrimary side winding is not connected with To another terminal of neutral point M and low frequency blocking condenser CLFBkTerminal T is connected to after series connectionk, k is subscript and k=herein 1,2,3；Three high-frequency isolation transformer THF1、THF2And THF3Vice-side winding be connected on neutral point N there are one terminal, it is high Frequency isolating transformer THFkVice-side winding is not attached to another terminal of neutral point N and low frequency blocking condenser CLFBk+3Series connection Be connected respectively to afterwards on exchange side terminal r, s, t of three-phase four-line dc-to-ac converter INV, herein k be subscript and k=1,2,3；Three-phase four Line inverter INV exchanges side terminal n is connected with neutral point N；Low-pass filtering capacitance CF1、CF2And CF3One end be connected respectively to friendship It flows on terminal a, b, c, CF1、CF2And CF3Other end be connected on three-phase four-line dc-to-ac converter INV exchanges side terminal n.
The three-level type alternating current-direct current mixes three port electric power electric transformers and is converted including three-level converting electric power, that is, cascades Type current transformer CCA、CCBAnd CCCRealize that electric energy is converted by the direct AC/AC of low-frequency ac and high-frequency ac, high-frequency isolation transformer THF1、THF2And THF3Realize electric energy high-frequency ac direct AC/AC conversion, three-phase four-line dc-to-ac converter INV realize simultaneously electric energy by The direct conversion of high-frequency ac and low-frequency ac and direct current.
The three-level type alternating current-direct current mixes the cascade converter CC in three port electric power electric transformersA、CCBAnd CCC The reference voltages of tetra- bridge arms of reference voltage and three-phase four-line dc-to-ac converter INV determined by following formula：
uCCA=uCCA_convention_control+usquare_HF_CM
uCCB=uCCB_convention_control+usquare_HF_CM
uCCC=uCCC_convention_control+usquare_HF_CM
uINVr=uan_ref+KHFT×usquare_HF_CM
uINVs=ubn_ref+KHFT×usquare_HF_CM
uINVt=ucn_ref+KHFT×usquare_HF_CM
uINVn=0
Wherein, uCCx_convention_controlFor cascade converter CCxPair of traditional capacitance voltage outer shroud+current inner loop Low frequency output voltage after closed-loop control and the Pressure and Control of submodule SM, x=A, B, C；usquare_HF_CMFor cascade converter CCA、CCBAnd CCCHigh frequency square wave common-mode voltage, usquare_HF_CMDuty cycle for 50%, frequency fsquare_HF；uan_ref、 ubn_refAnd ucn_refRespectively described three-level type electric power electric transformer AC port voltage uan、ubnAnd ucnReference value； uINVr、uINVs、uINVtAnd uINVnRespectively three-phase four-line dc-to-ac converter INV ac terminals r, s, t and n is compared with its DC side midpoint Voltage；KHFTFor high-frequency isolation transformer THF1、THF2And THF3Secondary and the ratio of primary side rated voltage.
The three-level type alternating current-direct current is mixed in three port electric power electric transformers, low frequency blocking condenser CLFB1、CLFB2、 CLFB3、CLFB4、CLFB5And CLFB6Cascade converter CC is obstructedA、CCBAnd CCCAnd three-phase four-line dc-to-ac converter INV exchange output electricity The low-frequency component of pressure, high frequency square wave common-mode voltage usquare_HF_CMAnd KHFT×usquare_HF_CMBy cascade converter CCA、CCBWith CCCElectric energy from high-frequency isolation transformer THF1、THF2And THF3Primary side be transferred to the three-phase four-line dc-to-ac converter INV of secondary；Low frequency Blocking condenser CLFB1And CLFB4、CLFB2And CLFB5、CLFB3And CLFB6Respectively with high-frequency isolation transformer THF1、THF2And THF3Leakage The resonant frequency for feeling the series resonant circuit of composition is equal to fsquare_HF。
Fig. 2 mixes three port electric power electric transformer cascade type current transformer CC for three-level type alternating current-direct current of the present inventionA、CCBWith CCCThe circuit diagram of one embodiment of interior submodule SM：Submodule SM is by DC capacitor Cdc, switch T1-T4, diode D1-D4It forms；Switch T1With T2Points of common connection for x, switch T3With T4Points of common connection for y, switch T1And T3Collector It is all connected to DC capacitor CdcAnode, switch T2And T4Emitter be connected to DC capacitor CdcCathode；Switch TkCollection Electrode and diode DkCathode links together, and switchs TkEmitter and diode DkAnode links together, k=herein 1,2,3,4.When the circuit is as cascade converter CCA、CCBAnd CCCDuring interior submodule SM, friendships of the terminal x and y as SM Flow port connection terminal, in adjacent submodule SM, the terminal y of the terminal x and next submodule SM of a upper submodule SM It links together, multiple submodule SM, which is so cascaded, forms cascade converter CCA、CCB、CCC、CCa、CCbAnd CCc。
Fig. 3 is the reality that three-level type alternating current-direct current of the present invention mixes three port electric power electric transformer three-phase four-line dc-to-ac converter INV Apply the circuit diagram of example：The three-phase four-line dc-to-ac converter INV is by DC capacitor CINV, switch T1-T8With diode D1-D8Structure Into；Switch T1With T2Points of common connection for r, switch T3With T4Points of common connection for s, switch T5With T6Points of common connection be T switchs T7With T8Points of common connection be n；Switch T1、T3、T5And T7Collector be all connected to DC capacitor CINVAnode, Switch T2、T4、T6And T8Emitter be all connected to DC capacitor CINVCathode；Switch TxCollector and diode DxCathode It links together, switchs TxEmitter and diode DxAnode links together, x=1 herein, and 2,3,4,5,6,7,8.Directly Galvanic electricity holds CINVAnode as the three-level type alternating current-direct current mix three port electric power electric transformers DC port positive terminal P, DC capacitor CINVCathode as the three-level type alternating current-direct current mix three port electric power electric transformers DC port cathode Terminal N.

Claims (4)

1. a kind of three-level type alternating current-direct current mixes three port electric power electric transformers, it is characterised in that：The three-level type alternating current-direct current It mixes three port electric power electric transformers and includes three filter inductance LgA、LgBAnd LgC, three cascade converter CCA、CCBWith CCC, six low frequency blocking condenser CLFB1、CLFB2、CLFB3、CLFB4、CLFB5And CLFB6And three high-frequency isolation transformer THF1、 THF2And THF3, a three-phase four-line dc-to-ac converter INV and by filter inductance LF1、LF2、LF3With low-pass filtering capacitance CF1、CF2、CF3Group Into three-phase low-pass filter；The AC port 1 of the three-level type electric power electric transformer includes tri- connecting pins of A, B, C Son, AC port 2 include tri- connection terminals of a, b, c, and DC port includes two connection terminals of P and N；Power can exchange Two-way flow between port 1, AC port 2 and DC port；Three filter inductance LgA、LgBAnd LgCThere are one terminals to distinguish It is connected on three connection terminals A, B, C of AC port 1, three filter inductance LgA、LgBAnd LgCThe other three terminal difference As connection terminal T1、T2And T3；Three filter inductance LF1、LF2And LF3AC port 2 is connected respectively to there are one terminal On three connection terminals a, b, c, three filter inductance LF1、LF2And LF3The other three terminal to be connected respectively to three-phase and four-line inverse Become on exchange the side terminal r, s, t of device INV；Three cascade converter CCA、CCBAnd CCCBy the identical submodule SM of quantity Composition, three cascade converter CC are sequentially connected in series in exchange sideA、CCBAnd CCCThere is one end to be connected on neutral point M, Three cascade converter CCA、CCBAnd CCCOther end be connected respectively to three connection terminal T1、T2、T3On；Three high frequencies Isolating transformer THF1、THF2And THF3Primary side winding be connected on neutral point M there are one terminal, high-frequency isolation transformer THFk Primary side winding is not attached to another terminal of neutral point M and low frequency blocking condenser CLFBkTerminal T is connected to after series connectionk, this Locate k as subscript and k=1,2,3；Three high-frequency isolation transformer THF1、THF2And THF3Vice-side winding there are one terminal connect Onto neutral point N, high-frequency isolation transformer THFkVice-side winding is not attached to another terminal of neutral point N and low frequency obstructs Capacitor CLFBk+3Be connected respectively to after series connection on exchange side terminal r, s, t of three-phase four-line dc-to-ac converter INV, herein k for subscript and K=1,2,3；Three-phase four-line dc-to-ac converter INV exchanges side terminal n is connected with neutral point N；Low-pass filtering capacitance CF1、CF2And CF3One End is connected respectively on ac terminal a, b, c, CF1、CF2And CF3Other end be connected to three-phase four-line dc-to-ac converter INV exchange side On terminal n.
2. three-level type alternating current-direct current as described in claim 1 mixes three port electric power electric transformers, it is characterised in that：Described Electric power electric transformer is converted including three-level converting electric power, i.e. cascade converter CCA、CCBAnd CCCRealize that electric energy is handed over by low frequency The direct AC/AC of stream and high-frequency ac is converted, high-frequency isolation transformer THF1、THF2And THF3Realize the straight of the high-frequency ac of electric energy AC/AC conversion is connect, three-phase four-line dc-to-ac converter INV realizes direct change of the electric energy by high-frequency ac and low-frequency ac and direct current simultaneously It changes.
3. three-level type alternating current-direct current as claimed in claim 2 mixes three port electric power electric transformers, it is characterised in that：Described Cascade converter CCA、CCBAnd CCCTetra- bridge arms of reference voltage and three-phase four-line dc-to-ac converter INV reference voltage by Following formula determines：
uCCA=uCCA_convention_control+usquare_HF_CM
uCCB=uCCB_convention_control+usquare_HF_CM
uCCC=uCCC_convention_control+usquare_HF_CM
uINVr=uan_ref+KHFT×usquare_HF_CM
uINVs=ubn_ref+KHFT×usquare_HF_CM
uINVt=ucn_ref+KHFT×usquare_HF_CM
uINVn=0
Wherein, uCCx_convention_controlFor cascade converter CCxThe two close cycles of traditional capacitance voltage outer shroud+current inner loop Low frequency output voltage after control and the Pressure and Control of submodule SM, x=A, B, C；usquare_HF_CMFor cascade converter CCA、 CCBAnd CCCHigh frequency square wave common-mode voltage, usquare_HF_CMDuty cycle for 50%, frequency fsquare_HF；uan_ref、ubn_refWith ucn_refRespectively described three-level type electric power electric transformer AC port voltage uan、ubnAnd ucnReference value；uINVr、uINVs、 uINVtAnd uINVnRespectively three-phase four-line dc-to-ac converter INV ac terminals r, s, t and n compared with its DC side midpoint voltage；KHFT For high-frequency isolation transformer THF1、THF2And THF3Secondary and the ratio of primary side rated voltage.
4. three-level type alternating current-direct current as described in claim 1 mixes three port electric power electric transformers, it is characterised in that：Described Three-level type alternating current-direct current is mixed in three port electric power electric transformers, low frequency blocking condenser CLFB1、CLFB2、CLFB3、CLFB4、CLFB5With CLFB6Cascade converter CC is obstructedA、CCBAnd CCCAnd the low-frequency component of three-phase four-line dc-to-ac converter INV ac output voltages, it is high Frequency square wave common-mode voltage usquare_HF_CMAnd KHFT×usquare_HF_CMBy cascade converter CCA、CCBAnd CCCElectric energy from high frequency Isolating transformer THF1、THF2And THF3Primary side be transferred to the three-phase four-line dc-to-ac converter INV of secondary；Low frequency blocking condenser CLFB1 And CLFB4、CLFB2And CLFB5、CLFB3And CLFB6Respectively with high-frequency isolation transformer THF1、THF2And THF3Leakage inductance composition series connection it is humorous Shake circuit resonant frequency be equal to fsquare_HF。
CN201711335505.3A 2017-12-14 2017-12-14 Three-stage AC/DC hybrid three-port power electronic transformer Active CN108092518B (en)

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CN109193659A (en) * 2018-10-18 2019-01-11 全球能源互联网研究院有限公司 A kind of mesolow alternating current-direct current mixing network system based on PET
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CN109709434A (en) * 2019-01-29 2019-05-03 上海交通大学 The test circuit of cascade converter multi-tool block multi-state simulation
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