CN110492764A - The single-phase AC and DC power electronic transformer of capacitor isolated - Google Patents
The single-phase AC and DC power electronic transformer of capacitor isolated Download PDFInfo
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- CN110492764A CN110492764A CN201910795301.0A CN201910795301A CN110492764A CN 110492764 A CN110492764 A CN 110492764A CN 201910795301 A CN201910795301 A CN 201910795301A CN 110492764 A CN110492764 A CN 110492764A
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- cascade type
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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
- 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
Abstract
A kind of single-phase AC and DC power electronic transformer of capacitor isolated is made of single-phase cascade type current transformer, filter inductance Lf, nonpolarity high_voltage isolation capacitor C1, nonpolarity high_voltage isolation capacitor C2, high-frequency inductor Lh and single-phase AC/DC converter.The output voltage uMN_ref of single-phase cascade type current transformer exchange consists of two parts: uMN_ref=ucloseloop+usquare_HF.Wherein, ucloseloop is the double-closed-loop control output voltage of single-phase cascade type current transformer, and usquare_HF is the square wave of duty ratio 50%, frequency fsquare_HF.Single-phase cascade type current transformer double-closed-loop control method are as follows: outer ring is the control ring of the sum of all power module capacitance voltages in single-phase cascade type current transformer, and inner ring is the AC current control ring for flowing through single-phase high voltage AC port.Single-phase AC/DC converter exchange end voltage is the square wave of 50% duty ratio, and the frequency of the square-wave voltage is fsquare_HF, and phase is identical as usquare_HF.
Description
Technical field
The present invention relates to a kind of electric power electric transformer, in particular to a kind of single-phase AC and DC power electronics of capacitor isolated
Transformer.
Background technique
Electric power electric transformer removing has except the electrical isolation and voltage class mapping function of traditional power transformer,
A variety of complex functions such as power quality controlling, DC equipment access, trend flexible modulation, Fault Isolation are also equipped with, in intelligent electricity
The fields such as net, energy internet, rail transit locomotive traction are with a wide range of applications.
Under existing technology, electric power electric transformer generally realizes the electricity of high and low pressure lateral circuit by medium/high frequency transformer
Air bound from.But there are high-voltage large-capacity medium/high frequency transformer operational efficiency to be difficult to improve, electricity-magnetic-heat is more for these technical solutions
The problems such as physical field Synthetical Optimization is difficult, circuit system topology is complicated, affects electric power electric transformer efficiency and power
The raising of density also leads to cost height, it is difficult to which scale promotes and applies.Patent of invention CN201310016540,
CN201410135384、CN201510129159、CN201610274288、CN201710079402、CN201711082371、
CN201811171060 etc. is to realize electrical isolation using medium/high frequency transformer.
Summary of the invention
The purpose of the present invention be intended to overcome existing electric power electric transformer generally use medium/high frequency transformer realize electrically every
From that there are circuit topologies is complicated, transformation of electrical energy series is more, low efficiency and semiconductor switch device quantity are more, poor reliability etc.
Disadvantage proposes a kind of single-phase AC and DC power electronic transformer based on Capacitor apart.
The single-phase AC and DC power electronic transformer of capacitor isolated of the present invention, by single-phase cascade type current transformer, filter inductance
Lf, nonpolarity high_voltage isolation capacitor C1, nonpolarity high_voltage isolation capacitor C2, high-frequency inductor LhIt is formed with single-phase AC/DC converter.
The single-phase cascade type current transformer by R power module PM-1, PM-2 ..., PM-R cascade connection constitute, R is positive integer.
Each power module contains two connection terminals of Z1 and Z2.Kth power module PM-k's in the single-phase cascade type current transformer
Connection terminal Z2 is connected to connection terminal Z11≤k≤R-1 of+1 power module PM- (k+1) of kth；The single-phase cascade type unsteady flow
The 1st power module PM-1 connection terminal Z1 in device is connected to M point；R power module in the single-phase cascade type current transformer
The connection terminal Z2 of PM-R is connected to J point.The filter inductance LfOne end be connected to M point, the filter inductance LfOther one
End is connected to the single-phase high voltage AC port connection terminal T1, and the single-phase high voltage AC port connection terminal T2 and J point connect
It is connected together.One end of the nonpolarity high_voltage isolation capacitor C1 is connected to M point, and the nonpolarity high_voltage isolation capacitor C1's is another
Outer one end is connected to the high-frequency inductor LhOne end, the high-frequency inductor LhOther end be connected to single-phase AC/DC converter
Exchange connection terminal a.One end of the nonpolarity high_voltage isolation capacitor C2 connects J point, the nonpolarity high_voltage isolation capacitor
The other end of C2 is connected to the exchange connection terminal b of single-phase AC/DC converter.The DC side of the single-phase AC/DC converter
The sub- P of anode connection terminal and DC side cathode connection terminal N is as the single-phase AC and DC power electronic transformer of the capacitor isolated
Two connection terminals of low-voltage direct port.
The high-pressure side of the single-phase AC and DC power electronic transformer of the capacitor isolated and lower-voltage circuit pass through electrodeless
Property high_voltage isolation capacitor C1 and C2 realize electrical isolation, the DC side output voltage of the single-phase AC/DC converter and the list
Each power module DC capacitor voltage is equal in phase cascade converter.
The ac output voltage reference value u of the single-phase cascade type current transformerMN_refConsist of two parts:
uMN_ref=ucloseloop+usquare_HF
Wherein, ucloseloopFor the double-closed-loop control output voltage of single-phase cascade type current transformer, usquare_HFFor duty ratio
50% high frequency square wave ingredient, frequency fsquare_HF, and fsquare_HFBy the nonpolarity high_voltage isolation capacitor C1, nonpolarity height
Press isolation capacitance C2, high-frequency inductor LhIt determines according to the following formula:
The single-phase cascade type current transformer takes double-closed-loop control method, and outer ring is to own in single-phase cascade type current transformer
The control ring of the sum of power module capacitance voltage, inner ring are the AC current control ring for flowing through single-phase high voltage AC port；Inner ring
The reference value amplitude of electric current is the output of outer voltage, and the phase of inner ring current reference value is the single-phase high voltage AC port electricity
Press usPhase.
Voltage u between the single-phase AC/DC converter ac terminal a and ac terminal babFor the side of 50% duty ratio
Wave, and the frequency of the square-wave voltage is fsquare_HF。uabPhase and the single-phase cascade type current transformer ac output voltage join
Examine value uMN_refIn high frequency square wave voltage usquare_HFPhase it is identical.
Detailed description of the invention
Fig. 1 is the schematic diagram of the single-phase AC and DC power electronic transformer circuit of capacitor isolated of the present invention；
Fig. 2 is the R in the single-phase AC and DC power electronic transformer of capacitor isolated of the present invention in single-phase cascade type current transformer
(R is positive integer) a power module PM-1, PM-2 ..., a kind of specific implementation circuit of PM-R and single-phase AC/DC converter it is former
Reason figure；
Fig. 3 is one of the computer artificial result of the single-phase AC and DC power electronic transformer of capacitor isolated of the present invention: single
The voltage u of phase high-voltage ac powersAnd electric current is, single-phase AC/DC converter DC load side voltage uPN；
Fig. 4 is the two of the computer artificial result of the single-phase AC and DC power electronic transformer of capacitor isolated of the present invention: single
The exchange side voltage u of phase AC/DC converterabWith electric current iab。
Specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the schematic diagram of the single-phase AC and DC power electronic transformer circuit of capacitor isolated of the present invention: the present invention
The single-phase AC and DC power electronic transformer of capacitor isolated is by single-phase cascade type current transformer, filter inductance Lf, nonpolarity high pressure every
From capacitor C1, nonpolarity high_voltage isolation capacitor C2, high-frequency inductor LhIt is formed with single-phase AC/DC converter.The single-phase cascade
Type current transformer by R power module PM-1, PM-2 ..., PM-R cascade connection constitute, R is positive integer；Each power module is equal
Containing two connection terminals of Z1 and Z2.Kth power module PM-k connection terminal Z2 in the single-phase cascade type current transformer is connected to
Kth+1 power module PM- (k+1) connection terminal Z1,1≤k≤R-1；The 1st power module in the single-phase cascade type current transformer
The connection terminal Z1 of PM-1 is connected to M point；The connection terminal Z2 of R power module PM-R in the single-phase cascade type current transformer
It is connected to J point.The filter inductance LfOne end be connected to M point, the filter inductance LfOther end be connected to it is described single-phase
High-voltage alternating port connection terminal T1, the single-phase high voltage AC port connection terminal T2 and J point link together.It is described electrodeless
Property high_voltage isolation capacitor C1 one end be connected to M point, the other end of the nonpolarity high_voltage isolation capacitor C1 is connected to described
High-frequency inductor LhOne end, the high-frequency inductor LhOther end be connected to the exchange connection terminal a of single-phase AC/DC converter.
One end of the nonpolarity high_voltage isolation capacitor C2 connects J point, the other end connection of the nonpolarity high_voltage isolation capacitor C2
To the exchange connection terminal b of single-phase AC/DC converter.The sub- P of DC side anode connection terminal of the single-phase AC/DC converter and straight
Flow two of side cathode connection terminal N as the single-phase AC and DC power electronic transformer low-voltage direct port of the capacitor isolated
Connection terminal.
The high-pressure side of the single-phase AC and DC power electronic transformer of the capacitor isolated and lower-voltage circuit pass through electrodeless
Property high_voltage isolation capacitor C1 and C2 realize electrical isolation, the DC side output voltage of the single-phase AC/DC converter and the list
Each power module DC capacitor voltage is equal in phase cascade converter.
The ac output voltage reference value u of the single-phase cascade type current transformerMN_refConsist of two parts:
uMN_ref=ucloseloop+usquare_HF
Wherein, ucloseloopFor the double-closed-loop control output voltage of single-phase cascade type current transformer, usquare_HFFor duty ratio
50% high frequency square wave ingredient, frequency fsquare_HF, and fsquare_HFBy the nonpolarity high_voltage isolation capacitor C1, nonpolarity height
Press isolation capacitance C2, high-frequency inductor LhIt determines according to the following formula:
The double-closed-loop control method of the single-phase cascade type current transformer, outer ring are active in single-phase cascade type current transformer
The control ring of the sum of rate module capacitance voltage, inner ring are the AC current control ring for flowing through single-phase high voltage AC port；Inner ring electricity
The reference value amplitude of stream is the output of outer voltage, and the phase of inner ring current reference value is the single-phase high voltage AC port voltage
usPhase.
Voltage u between the single-phase AC/DC converter ac terminal a and ac terminal babFor the side of 50% duty ratio
Wave, and the frequency of the square-wave voltage is fsquare_HF。uabPhase and the single-phase cascade type current transformer ac output voltage join
Examine value uMN_refIn high frequency square wave voltage usquare_HFPhase it is identical.
Fig. 2 is the R in the single-phase AC and DC power electronic transformer of capacitor isolated of the present invention in single-phase cascade type current transformer
A power module PM-1, PM-2 ..., a kind of specific implementation circuit diagram of PM-R and single-phase AC/DC converter, R is positive
Integer.As shown in Fig. 2, the circuit is by semiconductor switch device S1, S2, S3, S4, diode D1, D2, D3, D4 and DC capacitor
CdcComposition.The collector of semiconductor switch device Sk and the cathode of diode Dk link together, semiconductor switch device Sk's
The anode of emitter and diode Dk links together, k=1 here, and 2,3,4.The emitter of semiconductor switch device S1 with
The collector of semiconductor switch device S2 is connected to terminal x, the emitter and semiconductor switch device of semiconductor switch device S3
The collector of S4 is connected to terminal y.The collector of semiconductor switch device S1 and S3 are connected to DC capacitor CdcAnode, partly lead
The emitter of body switching device S2 and S4 are connected to DC capacitor CdcCathode.
When the circuit as the single-phase cascade type current transformator power module PM-1, PM-2 ..., PM-R when, the circuit
AC port connection terminal Z1 of the terminal x as each power module of single-phase cascade type current transformer, the terminal y conduct of the circuit
The AC port connection terminal Z2 of each power module of single-phase cascade type current transformer.When the circuit becomes as the single-phase AC/DC
When parallel operation, ac terminal a of the terminal x of the circuit as single-phase AC/DC converter, the terminal y of the circuit is as single-phase AC/DC
The ac terminal b of converter, circuit direct capacitor CdcAnode connection terminal sub- P of the anode as single-phase AC/DC converter, should
Circuit direct capacitor CdcCathode connection terminal N of the cathode as single-phase AC/DC converter.
The single-phase AC and DC power electronic transformer of capacitor isolated of the present invention uses following parameter: single-phase high voltage AC port
Voltage us=5000sin (100 π t) V, the direct current of all power modules of single-phase cascade type current transformer and single-phase AC/DC converter
Capacitance voltage rated value is 1.0kV, and single-phase cascade type current transformer cascade power module quantity is 10, filter inductance Lf=
100mH, nonpolarity high_voltage isolation capacitor C1=C2=20.26 μ F, high-frequency inductor=100 μ H, single-phase cascade type current transformer middle rank
Connection power module switching frequency is 10kHz, and high frequency square wave voltage frequency is 5kHz, and single-phase 2 Ω resistance of AC/DC converter band is negative
It carries, i.e., power is 500kW.Computer artificial result under this condition is shown in Fig. 3 and Fig. 4, and wherein Fig. 3 is single-phase high voltage exchange
The voltage u of power supplysAnd electric current is, single-phase AC/DC converter DC load side voltage uPN；Fig. 4 is single-phase AC/DC converter
Exchange side voltage uabWith electric current iab.By simulation result as it can be seen that the single-phase AC and DC power electronic transformer of capacitor isolated of the present invention
High-voltage alternating input side current sinusoidal degree is good, and almost the same with alternating voltage phase, and power factor is high；And DC output side
Voltage stabilization realizes single-phase high voltage alternating current to the voltage transformation of low-voltage direct, and passes through nonpolarity high pressure in 1.0kV or so
Isolation capacitance realizes the electrical isolation of high-pressure side and lower-voltage circuit.This simulation result also shows Capacitor apart of the present invention
The feasibility and correctness of the single-phase AC and DC power electronic transformer of type.
Claims (5)
1. a kind of single-phase AC and DC power electronic transformer of capacitor isolated, it is characterised in that: the capacitor isolated is single-phase
AC and DC power electronic transformer is by single-phase cascade type current transformer, filter inductance Lf, it is nonpolarity high_voltage isolation capacitor C1, nonpolarity
High_voltage isolation capacitor C2, high-frequency inductor LhIt is formed with single-phase AC/DC converter；The single-phase cascade type current transformer is by R function
Rate module PM-1, PM-2 ..., PM-R cascade connection constitute, R is positive integer；Each power module contains Z1 and Z2
Two connection terminals；The connection terminal Z2 of kth power module PM-k in the single-phase cascade type current transformer is connected to+1 function of kth
Rate module PM- (k+1) connection terminal Z1,1≤k≤R-1；The 1st power module PM-1's in the single-phase cascade type current transformer
Connection terminal Z1 is connected to M point；The connection terminal Z2 of R power module PM-R in the single-phase cascade type current transformer is connected to
J point；The filter inductance LfOne end be connected to M point, the filter inductance LfOther end be connected to the single-phase high voltage and hand over
Flow port connection terminal T1, the single-phase high voltage AC port connection terminal T2 and J point link together；The nonpolarity high pressure
One end of isolation capacitance C1 is connected to M point, and the other end of the nonpolarity high_voltage isolation capacitor C1 is connected to the high-frequency electrical
Feel LhOne end, the high-frequency inductor LhOther end be connected to the exchange connection terminal a of single-phase AC/DC converter；The nothing
One end of polarity high_voltage isolation capacitor C2 connects J point, and the other end of the nonpolarity high_voltage isolation capacitor C2 is connected to single-phase
The exchange connection terminal b of AC/DC converter；The sub- P of DC side anode connection terminal and DC side of the single-phase AC/DC converter are negative
Two connecting pins of the pole connection terminal N as the single-phase AC and DC power electronic transformer low-voltage direct port of the capacitor isolated
Son.
2. the single-phase AC and DC power electronic transformer of capacitor isolated as described in claim 1, it is characterised in that: the electricity
The high-pressure side and lower-voltage circuit for holding the single-phase AC and DC power electronic transformer of isolated form pass through nonpolarity high_voltage isolation capacitor C1
Electrical isolation is realized with C2, in the DC side output voltage of the single-phase AC/DC converter and the single-phase cascade type current transformer
Each power module DC capacitor voltage is equal.
3. the single-phase AC and DC power electronic transformer of capacitor isolated as described in claim 1, it is characterised in that: the list
The ac output voltage reference value u of phase cascade converterMN_refConsist of two parts:
uMN_ref=ucloseloop+usquare_HF
Wherein, ucloseloopFor the double-closed-loop control output voltage of single-phase cascade type current transformer, usquare_HFFor duty ratio 50%
High frequency square wave ingredient, frequency fsquare_HF, and fsquare_HFBy the nonpolarity high_voltage isolation capacitor C1, nonpolarity high_voltage isolation
Capacitor C2, high-frequency inductor LhIt determines according to the following formula:
4. the single-phase AC and DC power electronic transformer of capacitor isolated as described in claim 1, it is characterised in that: the list
The double-closed-loop control method of phase cascade converter, outer ring be single-phase cascade type current transformer in all power module capacitance voltages it
The control ring of sum, inner ring are the AC current control ring for flowing through single-phase high voltage AC port；The reference value amplitude of interior circular current is
The output of outer voltage, the phase of inner ring current reference value are the single-phase high voltage AC port voltage usPhase.
5. the single-phase AC and DC power electronic transformer of capacitor isolated as described in claim 1, it is characterised in that: the list
Voltage u between phase AC/DC converter ac terminal a and ac terminal babFor the square wave of 50% duty ratio, and the square-wave voltage
Frequency be fsquare_HF。uabPhase and the single-phase cascade type current transformer ac output voltage reference value uMN_refIn height
Frequency square-wave voltage usquare_HFPhase it is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910795301.0A CN110492764A (en) | 2019-08-27 | 2019-08-27 | The single-phase AC and DC power electronic transformer of capacitor isolated |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910795301.0A CN110492764A (en) | 2019-08-27 | 2019-08-27 | The single-phase AC and DC power electronic transformer of capacitor isolated |
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| Publication Number | Publication Date |
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| CN110492764A true CN110492764A (en) | 2019-11-22 |
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| CN201910795301.0A Pending CN110492764A (en) | 2019-08-27 | 2019-08-27 | The single-phase AC and DC power electronic transformer of capacitor isolated |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053154A (en) * | 1989-05-18 | 1991-07-17 | 中野博民 | Switch power supply equipment and partition method thereof |
| CN101795081A (en) * | 2010-03-03 | 2010-08-04 | 中国科学院电工研究所 | Power electronic transformer having multi-winding isolation transformer |
| CN107171578A (en) * | 2017-06-22 | 2017-09-15 | 中国科学院电工研究所 | Two Stages type AC DC electric power electric transformer |
| CN107612407A (en) * | 2017-09-12 | 2018-01-19 | 东南大学 | High power density electric power electric transformer topological structure and its control method |
| 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 |
-
2019
- 2019-08-27 CN CN201910795301.0A patent/CN110492764A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053154A (en) * | 1989-05-18 | 1991-07-17 | 中野博民 | Switch power supply equipment and partition method thereof |
| CN101795081A (en) * | 2010-03-03 | 2010-08-04 | 中国科学院电工研究所 | Power electronic transformer having multi-winding isolation transformer |
| CN107171578A (en) * | 2017-06-22 | 2017-09-15 | 中国科学院电工研究所 | Two Stages type AC DC electric power electric transformer |
| CN107612407A (en) * | 2017-09-12 | 2018-01-19 | 东南大学 | High power density electric power electric transformer topological structure and its control method |
| 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 |
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