CN109450279A - Three-level type AC and DC power electronic transformer dc-link capacitance pre-charge method - Google Patents
Three-level type AC and DC power electronic transformer dc-link capacitance pre-charge method Download PDFInfo
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- CN109450279A CN109450279A CN201811473271.3A CN201811473271A CN109450279A CN 109450279 A CN109450279 A CN 109450279A CN 201811473271 A CN201811473271 A CN 201811473271A CN 109450279 A CN109450279 A CN 109450279A
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- link capacitance
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02M5/40—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 with intermediate conversion into dc
- H02M5/42—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 with intermediate conversion into dc by static converters
- H02M5/44—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac 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 AC and DC power electronic transformer dc-link capacitance pre-charge method, during the charging process, the connection of off device and alternating current-direct current power distribution network first, within the different control periods, the power module PM of each phasing commutator rotation selection investment respective numbers in high-pressure side, makes it while exporting the high frequency square wave voltage of 50% duty ratio, and each same frequency of phasing commutator SM output in low-voltage direct side is the same as phase square-wave voltage, then in low-pressure side by control auxiliary charging equipment, via capacitor CLFBWith transformer leakage inductance LrBeing formed by resonant network is that high and low pressure side dc-link capacitance charges.The present invention can effectively reduce the rush of current of system in charging process, while high and low pressure side dc-link capacitance voltage can be made to rise to declared working condition operating value, to reduce ac-side current impact of equipment when grid-connected.
Description
Technical field
The present invention relates to a kind of AC and DC power electronic transformer dc-link capacitance pre-charge methods.
Background technique
Following smart grid requires electric equipment intelligent and electric property superiorization, such as high power supply quality, convenient for can be again
Raw energy power generation access etc..Power distribution network is the important component of power grid, and in power distribution network, distribution transformer is that application is most universal
A kind of equipment, the annual output of China's distribution transformer accounts for about the 1/3 of all transformer annual outputs.Therefore, distribution transformer
Performance of the performance concerning the following smart grid, and traditional transformer far can not meet the high power supply quality and intelligence of the following smart grid
The requirement of energyization.
Electric power electric transformer is also referred to as solid-state transformer or energy router, and compared with traditional transformer, power electronics becomes
Depressor not only have the function of voltage class transformation and electrical isolation, but also can be realized trend two-way flow, utility power quality control,
The alternating current-direct current port energy in bidirectional flow of device automatic protection, different voltages grade.Therefore, electric power electric transformer is intelligent electricity
The important component of net, energy internet and the following AC-DC interconnecting power network, carries the following power grid transformation of electrical energy and processing
Task.
Currently, being input in 10kV or the AC and DC power electronic transformer of higher voltage classes of applications from exchange
Direct current output has seriously affected running efficiency of system, while numerous electrical energy transformers causes by multistage power change unit
System structure is complicated, and cost is high and reliability is low.To solve the above problems, patent CN108092518A and CN107171578A,
It is proposed that a kind of three-level type AC and DC power electronic transformer, the quasi-converter are input to transformation of electrical energy needed for direct current output from exchange
Unit series is few, and power density is higher.
Electric power electric transformer is before normal operation, it is necessary first to it charges to high and low pressure side dc-link capacitance, it is existing
Some charging methods can be that dc-link capacitance charges using High-voltage AC Network, such as patent CN108696165A,
CN103973094B, operation implementation is more convenient, and technology relative maturity, but bus capacitor voltage can not be charged to rated value,
And the charging resistor and breaker of high pressure level are needed, in addition, charging resistor and breaker are bulky expensive, while from
On high-tension side precharge operation also increases the risk in charging process.For three-level type AC and DC power electronic transformer,
Rated value, the big valence of charging equipment volume can not be charged to by still remaining bus capacitor voltage using the method that High-voltage AC Network charges
The problems such as lattice are high, risk is big.
Summary of the invention
It is an object of the invention to overcome prior art disadvantage, propose that a kind of three-level type AC and DC power electronics that is suitable for becomes
Depressor dc-link capacitance pre-charge method.The present invention is in low-pressure side using charging auxiliary circuit come for dc-link capacitances at different levels
Charging, control mode is relatively easy, and high-pressure side and low-pressure side dc-link capacitance voltage can equilibrium be charged to rated value.
Using three-level type AC and DC power the first high-frequency isolation transformer of electronic transformer TF of the invention1, the second high frequency
Isolating transformer TF2With third high-frequency isolation transformer TF3For boundary, it is divided into high-voltage alternating and low-voltage direct two parts and external three
The part that phase High-voltage AC Network A, B with C phase is electrically connected is that the part that high-pressure side and low-voltage direct P and N-terminal are electrically connected is
Low-pressure side.The first high-frequency isolation transformer TF1, the second high-frequency isolation transformer TF2With third high-frequency isolation transformer
TF3Structure is identical, and parameter is identical.
High-pressure side exchanges side A phase filter inductance LgaOne end be connected to high-voltage alternating side the first power module of A phasing commutator
PM1AC output terminal a, B phase filter inductance LgbOne end be connected to high-voltage alternating side the first power module of B phasing commutator
PM1AC output terminal a, C phase filter inductance LgcOne end be connected to corresponding high-voltage alternating side C phasing commutator the first power mould
Block PM1AC output terminal a, high-voltage alternating side A phase filter inductance Lga, B phase filter inductance LgbWith C phase filter inductance Lgc's
Other end is respectively connected to high-voltage alternating side A, B and C phase power grid by three-phase high-voltage A.C. contactor S1.
Each phasing commutator in high-voltage alternating side is made of N number of power module PM cascade, and the value range of N is 3~10.Each
Power module is made of modularization H bridging parallel operation, and high-pressure side dc-link capacitance C is integrated in each converterH.Single function
In rate module, high-pressure side dc-link capacitance CH, switch T1-T4, diode D1-D4, switch T1With switch T2Points of common connection
It is AC output terminal a, switch T3With switch T4Points of common connection be AC output terminal b, switch T1With switch T3Current collection
Pole is all connected to high-pressure side dc-link capacitance CHAnode, switch T2With switch T4Emitter be all connected to high-pressure side direct current
Bus capacitor CHCathode, switch TxCollector and diode DxCathode links together, switch TxEmitter and diode
DxAnode links together, x=1 herein, and 2,3,4.The AC output terminal b of each power module and adjacent power module
AC output terminal a connection.High-voltage alternating side A phase, B phase and C phasing commutator N power module PMNAC output terminal b connect
It is connected to three-level type AC and DC power electronic transformer star contact M.
First low-frequency ac obstructs capacitor CLFB1, the second low-frequency ac obstruct capacitor CLFB2Electricity is obstructed with third low-frequency ac
Hold CLFB3It is separately connected each phasing commutator in high-voltage alternating side and the first high-frequency isolation transformer TF1, the second high-frequency isolation transformer
TF2With third high-frequency isolation transformer TF3.First low-frequency ac obstructs capacitor CLFB1, the second low-frequency ac obstruct capacitor CLFB2With
Third low-frequency ac obstructs capacitor CLFB3Parameter and structure it is all the same.First low-frequency ac obstructs capacitor CLFB1One end it is corresponding
It is connected to high-voltage alternating side the first power module of A phasing commutator PM1AC output terminal a, the second low-frequency ac obstruct capacitor
CLFB2One end be correspondingly connected to high-voltage alternating side the first power module of B phasing commutator PM1AC output terminal a, third low frequency
Exchange barrier capacitor CLFB3One end be correspondingly connected to high-voltage alternating side the first power module of C phasing commutator PM1Ac output end
Sub- a, the first low-frequency ac obstruct capacitor CLFB1The other end be connected to the first high-frequency isolation transformer TF1High-pressure side winding c,
Second low-frequency ac obstructs capacitor CLFB2The other end be connected to the second high-frequency isolation transformer TF2High-pressure side winding c, third
Low-frequency ac obstructs capacitor CLFB3The other end be connected to third high-frequency isolation transformer TF3High-pressure side winding c.In addition, high frequency
High voltage side of transformer winding d is connected to star contact M.
Low-voltage direct side the first power module SM1Exchange side output terminal g and h be connected to the first high-frequency isolation transformer
TF1Low-pressure side winding terminals e and f, the second power module SM2Exchange side output terminal g and h be connected to the second isolating transformer
TF2Low-pressure side winding terminals e and f, third power module SM3Exchange side output terminal g and h, be connected to third high-frequency isolation change
Depressor TF3Low-pressure side winding terminals e and f.The each power module in low-voltage direct side uses modularization H bridging parallel operation, and each change
Low-pressure side dc-link capacitance C is integrated in parallel operationL, switch M1With M2Points of common connection be AC output terminal g, switch M3
With switch M4Points of common connection be AC output terminal h, switch M1With switch M3Collector to be all connected to low-pressure side direct current female
Line capacitance CLAnode, switch M2With switch M4Emitter be all connected to low-pressure side dc-link capacitance CLCathode, switch Mx
Collector and diode QxCathode links together, switch MxEmitter and diode QxAnode links together, herein
X=1,2,3,4.Each low side power module busbar capacitor CLAnode connection after low pressure is connected to by low-voltage direct short-circuiting device S2
DC grid positive terminal P.Each low side power module busbar capacitor CLCathode connection after, pass through low-voltage direct short-circuiting device S2
It is connected to low-voltage direct power grid negative terminal R.
Low-voltage alternating-current A, B are connected to by three-phase low-voltage A.C. contactor S3 using low pressure auxiliary charging equipment of the invention
With C phase power grid.The other end of three-phase low-voltage A.C. contactor S3 is connected to the low-pressure side winding terminals of step-up transformer TF4
It is uncontrollable to be connected to three-phase after high-pressure side winding terminals H1 the first charging resistor of connection R1 of step-up transformer TF4 by L1, L2 and L3
It is connected to after high-pressure side winding terminals H2 the second charging resistor of connection R2 of the input terminal a1 of rectifier bridge, step-up transformer TF4
The high-pressure side winding terminals H3 connection third charging resistor of the input terminal b1 of the uncontrollable rectifier bridge of three-phase, step-up transformer TF4
The input terminal c1 of the uncontrollable rectifier bridge of three-phase is connected to after R3.One end of three-phase by-pass switch S4 is respectively connected to boosting transformation
High-pressure side winding terminals H1, H2 and H3 of device TF4, the other end of three-phase by-pass switch S4 are respectively connected to the uncontrollable rectification of three-phase
Input terminal A1, B1 and C1 of bridge.The sub- X connection Absorption Capacitance C of the uncontrollable rectification bridge output end of three-phase1Positive X1, Zhi Houlian
It is connected to three-level type AC and DC power electronic transformer low-voltage direct side third power module SM3Low-pressure side dc-link capacitance CL's
Anode；The sub- Y connection Absorption Capacitance C of the uncontrollable rectification bridge output end of three-phase1Cathode Y1 after, be connected to three-level type AC and DC power
Electronic transformer low-voltage direct side third power module SM3Low-pressure side dc-link capacitance CLCathode.
The step of three-level type AC and DC power electronic transformer dc-link capacitance pre-charge method of the present invention, is as follows:
1) three-phase in three-phase high-voltage exchange side contactor S1, low-voltage direct side breaker S2 and auxiliary charging equipment is disconnected
Low voltage AC contactor S3 and three-phase by-pass switch S4；
2) the concatenated power module PM in high-voltage alternating side A phase, B phase and C phasing commutator is unlocked1To PMNSwitching tube, with
And low-voltage direct side power module SM1, SM2And SM3Switching tube.In continuous and circulation W control cycle T c, according to from
It is small to arrive big number order, the k power module investment of each phasing commutator in high-voltage alternating side is selected, k is less than or equal to high-voltage alternating
Side A phase, B phase and C phasing commutator cascade power module quantity N.Keep k power module of each phasing commutator in high-voltage alternating side same
When export the high frequency square wave voltage u of 50% duty ratiosquare, in preceding 0.5 control cycle TCIt is interior, opening in k power module is connected
Close pipe T1And switch transistor T4, in rear 0.5 control cycle TCIt is interior, the switch transistor T of k power module is connected2And T3, remaining N-k function
Rate module is in excision state.In entirely control cycle T c, switch transistor T is connected2And switch transistor T4, and low-voltage direct side power
Module SM1, SM2And SM3Output, with phase square-wave voltage, controls cycle T preceding 0.5 with frequencyCIt is interior, low-voltage direct side power mould is connected
Block SM1, SM2And SM3Switching tube M1With switching tube M4, in rear 0.5 control cycle TCIt is interior, low-voltage direct side power module is connected
SM1, SM2And SM3Switching tube M2With switching tube M3。
3) it is closed three-phase low-voltage A.C. contactor S3, in the process, keeps high-pressure side power module switching tube and low pressure
The power module switching tube of side is in the unlocked state.To each phasing commutator power module PM in high-voltage alternating side1To PMNDirect current it is female
Line capacitance CHVoltage and low-voltage direct side power module SM1, SM2And SM3Dc-link capacitance CLWhen voltage reaches stable, closure
Three-phase by-pass switch S4 makes each phasing commutator power module PM in high-voltage alternating side1To PMNDc-link capacitance CHVoltage rises to
Rated value UH, low-voltage direct side power module SM1, SM2And SM3Dc-link capacitance CLVoltage rises to rated value UL。
4) to the dc-link capacitance voltage of high-pressure side power module and the dc-link capacitance of low side power module electricity
After pressure rises to rated value, disconnecting three-phase low-voltage A.C. contactor S3 and three-phase by-pass switch S4, charging terminates.
The high-pressure side dc-link capacitance CHFor the bus electricity of all power modules of each phasing commutator in high-voltage alternating side
Hold；The low-pressure side dc-link capacitance CLFor low-voltage direct side power module SM1, SM2, SM3Bus capacitor.
In the step 2), the calculation formula for the power module quantity k that every phase is put into every time are as follows:
Wherein, kTFFor the first high frequency transformer TF of three-level type AC and DC power electronic transformer1, the second high frequency transformer
TF2With third high frequency transformer TF3Primary side winding and vice-side winding turn ratio, ULFor low-pressure side dc-link capacitance voltage
Rated value, UHFor high-pressure side dc-link capacitance voltage rating.
Control cycle T c in the step 2) are as follows:
Wherein, LresFor the first high frequency transformer TF of three-level type AC and DC power electronic transformer1, the second high frequency transformation
Device TF2With third high frequency transformer TF3Vice-side winding short circuit when the primary side winding inductance value that measures, CresFor three-level type alternating current-direct current
The first low-frequency ac in electric power electric transformer obstructs capacitor CLFB1, the second low-frequency ac barrier capacitor CLFB2With third low frequency
Exchange barrier capacitor CLFB3Capacitance.
High frequency square wave voltage u in the step 2)squareWorking frequency fsquareValue are as follows:
Wherein, Tc is pre-charge process mesohigh side inverter power module switch pipe and low-pressure side inverter power module
The control period of switching tube.
In the step 2), power module investing method is as follows in each phasing commutator in high-voltage alternating side:
A) to N number of power module PM in A, B and the C phasing commutator of high-voltage alternating side1To PMNNumber, from A, B and C phase high pressure
Alternating current net side is to high-voltage alternating side converter star contact M, N number of power module PM in each phasing commutator1To PMNModule is numbered successively
For TM1To TMN。
B) the power module quantity N phase in W control cycle T c, in each phasing commutator of number and high-voltage alternating side of W
Together, each control period puts into a power module.To N number of power module PM of high-voltage alternating side A, B and C phasing commutator1Extremely
PMNIt puts by several times, the number of investment is identical with the power module quantity N in each phasing commutator in high-voltage alternating side, and each every phase is all
K power module is put into, according to TM1To TMNNumber sequence from small to large, circulation selection high-voltage alternating side A, B and C phase transformation
K power module of each phase of parallel operation is put into.In the adjacent K power module put into twice, in K power module of rear investment
In, the number of first module is bigger by 1 than the number of first module in K power module formerly putting into, i.e., in K=5, N's
Value range is in 10,10 control cycle T c, and investment number is TM for the first time1~TM5Power module, second investment compiles
Number be TM2~TM6Power module, third time investment number be TM3~TM7Power module, the 4th investment number is TM4~
TM8Power module, the 5th investment number is TM5~TM9Power module, the 6th investment number is TM6~TM10Function
Rate module.As the last one power module TM10After investment, then from number be TM1First module investment, so recycle, i.e.,
7th time investment number is TM7~TM1, power module, the 8th investment number is TM8~TM2Power module, the 9th time
Investment number is TM9~TM3Power module, the tenth investment number is TM10~TM4Power module, altogether put into 10 times.
3) it repeats the above steps a) and step b) by the loop control time of W control cycle T c, until high-pressure side and low
Press the power module dc-link capacitance charging complete of side.
Charging modes of the present invention are being filled by charging from low-voltage direct side to each power module dc-link capacitance
In electric process, high-pressure side and each phase power module of low-pressure side export 50% duty ratio with frequency same-phase high frequency square wave, charging current
High frequency transformer TF can be passed through1, TF2Capacitor C is obstructed with the leakage inductance and low-frequency ac of TFLFB1、CLFB2And CLFB3The Resonance Neural Network of formation
Network is the dc-link capacitance charging of each power module, meanwhile, using control mode of the present invention, without acquiring each power module
DC bus-bar voltage and high frequency transformer electric current are ranked up selection rotation investing method, and with the investing method that is previously set into
Row control, it is easy to operate, the work of the switching tube of high-pressure side and each phase power module of low-pressure side can be made in zero current condition, further
Reduction system charging when switching loss.
Compared with prior art, the invention has the following beneficial effects:
Compared with the existing recharge technique from high-voltage alternating side, three-level type AC and DC power electronic transformer of the invention
Pre-charge method is avoided because high-voltage alternating side voltage class height causes charging equipment bulky, the higher problem of risk；System
System uses opened loop control, and control mode is by a relatively simple, and pre-charge current impact is small；High-pressure side and low-pressure side DC bus electricity
Declared working condition operating value can be charged to by holding voltage, to keep equipment current on line side impact when being incorporated to AC network small.
Detailed description of the invention
Fig. 1 is to illustrate using three-level type AC and DC power electronic transformer of the invention and low pressure auxiliary charging device structure
Figure；
Fig. 2 is that mesohigh of the embodiment of the present invention exchanges all power modules exchange side output voltage u of side A phasing commutatorabIt is imitative
True waveform；
Fig. 3 is mesolow of embodiment of the present invention DC side A phase power module SM1Exchange side output voltage uabSimulation waveform；
Fig. 4 is the first high frequency transformer TF in the embodiment of the present invention1Primary side winding charging current simulation waveform；
Fig. 5 is that mesohigh of embodiment of the present invention exchange all power module dc-link capacitance voltages of side A phasing commutator are imitative
True waveform；
Fig. 6 is each phasing commutator SM of mesolow of embodiment of the present invention DC side1Dc-link capacitance voltage simulation waveform；
Specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
It is as shown in Figure 1 using three-level type AC and DC power electronic transformer of the invention.With the first high-frequency isolation transformer
TF1, the second high-frequency isolation transformer TF2With third high-frequency isolation transformer TF3For boundary, it is divided into high-voltage alternating and low-voltage direct two
The part that part and external three-phase high-voltage AC network A, B with C phase are electrically connected is high-pressure side and the end low-voltage direct P and R electricity
The part of gas connection is low-pressure side.The first high-frequency isolation transformer TF1, the second high-frequency isolation transformer TF2With third height
Frequency isolating transformer TF3Structure is identical, and parameter is identical.
High-pressure side exchanges side A phase filter inductance LgaOne end be connected to high-voltage alternating side the first power module of A phasing commutator
PM1AC output terminal a, B phase filter inductance LgbOne end be connected to high-voltage alternating side the first power module of B phasing commutator
PM1AC output terminal a, C phase filter inductance LgcOne end be connected to corresponding high-voltage alternating side C phasing commutator the first power mould
Block PM1AC output terminal a, high-voltage alternating side A phase filter inductance Lga, B phase filter inductance LgbWith C phase filter inductance Lgc's
Other end is respectively connected to high-voltage alternating side A, B and C phase power grid by three-phase high-voltage A.C. contactor S1.
Each phasing commutator in high-voltage alternating side is made of N number of power module PM cascade, and the value range of N is 3~10.Each
Power module is made of modularization H bridging parallel operation, and high-pressure side dc-link capacitance C is integrated in each converterH.Single function
In rate module, high-pressure side dc-link capacitance CH, switch T1-T4, diode D1-D4, switch T1With switch T2Points of common connection
It is AC output terminal a, switch T3With switch T4Points of common connection be AC output terminal b, switch T1With switch T3Current collection
Pole is all connected to high-pressure side dc-link capacitance CHAnode, switch T2With switch T4Emitter be all connected to high-pressure side direct current
Bus capacitor CHCathode, switch TxCollector and diode DxCathode links together, switch TxEmitter and diode
DxAnode links together, x=1 herein, and 2,3,4.The AC output terminal b of each power module and adjacent power module
AC output terminal a connection.High-voltage alternating side A phase, B phase and C phasing commutator N power module PMNAC output terminal b connect
It is connected to three-level type AC and DC power electronic transformer star contact M.
First low-frequency ac obstructs capacitor CLFB1, the second low-frequency ac obstruct capacitor CLFB2Electricity is obstructed with third low-frequency ac
Hold CLFB3It is separately connected each phasing commutator in high-voltage alternating side and the first high-frequency isolation transformer TF1, the second high-frequency isolation transformer
TF2With third high-frequency isolation transformer TF3.First low-frequency ac obstructs capacitor CLFB1, the second low-frequency ac obstruct capacitor CLFB2With
Third low-frequency ac obstructs capacitor CLFB3Parameter and structure it is all the same.First low-frequency ac obstructs capacitor CLFB1One end it is corresponding
It is connected to high-voltage alternating side the first power module of A phasing commutator PM1AC output terminal a, the second low-frequency ac obstruct capacitor
CLFB2One end be correspondingly connected to high-voltage alternating side the first power module of B phasing commutator PM1AC output terminal a, third low frequency
Exchange barrier capacitor CLFB3One end be correspondingly connected to high-voltage alternating side the first power module of C phasing commutator PM1Ac output end
Sub- a, the first low-frequency ac obstruct capacitor CLFB1The other end be connected to the first high-frequency isolation transformer TF1High-pressure side winding c,
Second low-frequency ac obstructs capacitor CLFB2The other end be connected to the second high-frequency isolation transformer TF2High-pressure side winding c, third
Low-frequency ac obstructs capacitor CLFB3The other end be connected to third high-frequency isolation transformer TF3High-pressure side winding c.In addition, high frequency
High voltage side of transformer winding d is connected to star contact M.
Low-voltage direct side the first power module SM1Exchange side output terminal g and h be connected to the first high-frequency isolation transformer
TF1Low-pressure side winding terminals e and f, the second power module SM2Exchange side output terminal g and h be connected to the second isolating transformer
TF2Low-pressure side winding terminals e and f, third power module SM3Exchange side output terminal g and h, be connected to third high-frequency isolation change
Depressor TF3Low-pressure side winding terminals e and f.The each power module in low-voltage direct side uses modularization H bridging parallel operation, and each change
Low-pressure side dc-link capacitance C is integrated in parallel operationL, switch M1With M2Points of common connection be AC output terminal g, switch M3
With switch M4Points of common connection be AC output terminal h, switch M1With switch M3Collector be all connected to low-pressure side bus electricity
Hold CLAnode, switch M2With switch M4Emitter be all connected to low-pressure side dc-link capacitance CLCathode, switch MxCollection
Electrode and diode QxCathode links together, switch MxEmitter and diode QxAnode links together, x=herein
1,2,3,4.Each low side power module busbar capacitor CLAnode connection after low-pressure direct is connected to by low-voltage direct short-circuiting device S2
Galvanic electricity net positive terminal P.Each low side power module busbar capacitor CLIt is connected to after cathode connection by low-voltage direct short-circuiting device S2
Low-voltage direct power grid negative terminal R.
Low-voltage alternating-current A, B are connected to by three-phase low-voltage A.C. contactor S3 using low pressure auxiliary charging equipment of the invention
With C phase power grid.The other end of three-phase low-voltage A.C. contactor S3 is connected to the low-pressure side winding terminals of step-up transformer TF4
It is uncontrollable to be connected to three-phase after high-pressure side winding terminals H1 the first charging resistor of connection R1 of step-up transformer TF4 by L1, L2 and L3
It is connected to after high-pressure side winding terminals H2 the second charging resistor of connection R2 of the input terminal a1 of rectifier bridge, step-up transformer TF4
The high-pressure side winding terminals H3 connection third charging resistor of the input terminal b1 of the uncontrollable rectifier bridge of three-phase, step-up transformer TF4
The input terminal c1 of the uncontrollable rectifier bridge of three-phase is connected to after R3.One end of three-phase by-pass switch S4 is respectively connected to boosting transformation
High-pressure side winding terminals H1, H2 and H3 of device TF4, the other end of three-phase by-pass switch S4 are respectively connected to the uncontrollable rectification of three-phase
Input terminal A1, B1 and C1 of bridge.The sub- X connection Absorption Capacitance C of the uncontrollable rectification bridge output end of three-phase1Positive X1, Zhi Houlian
It is connected to three-level type AC and DC power electronic transformer low-voltage direct side third power module SM3Low-pressure side dc-link capacitance CL's
Anode；The sub- Y connection Absorption Capacitance C of the uncontrollable rectification bridge output end of three-phase1Cathode Y1 after be connected to three-level type AC and DC power
Electronic transformer low-voltage direct side third power module SM3Low-pressure side dc-link capacitance CLCathode.
The step of each power module dc-link capacitance pre-charge method of three-level type AC and DC power electronic transformer of the present invention
It is rapid as follows:
1) three-phase in three-phase high-voltage exchange side contactor S1, low-voltage direct side breaker S2 and auxiliary charging equipment is disconnected
Low voltage AC contactor S3 and three-phase by-pass switch S4；
2) high-voltage alternating side A phase, B phase and C phasing commutator cascade power module PM are unlocked1To PMNSwitching tube, and
Low-voltage direct side power module SM1, SM2And SM3Switching tube.In continuous and circulation W control cycle T c, according to from small
To big number order, the k power module investment of each phasing commutator in high-voltage alternating side is selected, k is less than or equal to high-voltage alternating side A
Phase, B phase and C phasing commutator cascade power module quantity N.Make k power module of each phasing commutator in high-voltage alternating side simultaneously
Export the high frequency square wave voltage u of 50% duty ratiosquare, in preceding 0.5 control cycle TCIt is interior, the switch in k power module is connected
Pipe T1And switch transistor T4, in rear 0.5 control cycle TCIt is interior, the switch transistor T of k power module is connected2And T3, remaining N-k power
Module is in excision state.In entirely control cycle T c, switch transistor T is connected2And switch transistor T4, and low-voltage direct side power mould
Block SM1, SM2And SM3Output, with phase square-wave voltage, controls cycle T preceding 0.5 with frequencyCIt is interior, low-voltage direct side power module is connected
SM1, SM2And SM3Switching tube M1With switching tube M4, in rear 0.5 control cycle TCIt is interior, low-voltage direct side power module SM is connected1,
SM2And SM3Switching tube M2With switching tube M3。
3) it is closed three-phase low-voltage A.C. contactor S3, in the process, keeps high-pressure side power module switching tube and low pressure
The power module switching tube of side is in the unlocked state.To each phasing commutator power module PM in high-voltage alternating side1To PMNAnd low-pressure direct
Flow side power module SM1, SM2And SM3Dc-link capacitance voltage when reaching stable, be closed three-phase by-pass switch S4, make high pressure
Exchange each phasing commutator power module PM in side1To PMNDc-link capacitance voltage rise to rated value UH, low-voltage direct side power
Module SM1, SM2And SM3Dc-link capacitance voltage rise to rated value UL。
4) to the dc-link capacitance voltage of high-pressure side power module and the dc-link capacitance of low side power module electricity
After pressure rises to rated value, disconnecting three-phase low-voltage A.C. contactor S3 and three-phase by-pass switch S4, charging terminates.
In the step 2), every group determines k power module of investment, the calculation formula of k are as follows:
Wherein, kTFFor the first high frequency transformer TF of three-level type AC and DC power electronic transformer1, the second high frequency transformer
TF2With third high frequency transformer TF3Primary side winding and vice-side winding turn ratio, ULFor low-pressure side dc-link capacitance voltage
Rated value, UHFor high-pressure side dc-link capacitance voltage rating.
Control cycle T c in the step 2) are as follows:
Wherein, LresFor the first high frequency transformer TF of three-level type AC and DC power electronic transformer1, the second high frequency transformation
Device TF2With third high frequency transformer TF3Vice-side winding short circuit when the primary side winding inductance value that measures, CresFor three-level type alternating current-direct current
The first low-frequency ac in electric power electric transformer obstructs capacitor CLFB1, the second low-frequency ac barrier capacitor CLFB2With third low frequency
Exchange barrier capacitor CLFB3Capacitance.
High frequency square wave voltage u in the step 2)squareWorking frequency fsquareValue are as follows:
Wherein, Tc is pre-charge process mesohigh side inverter power module switch pipe and low-pressure side inverter power module
The control period of switching tube.
In the step 2), power module investing method is as follows in each phasing commutator in high-voltage alternating side:
1) to N number of power module PM in A, B and the C phasing commutator of high-voltage alternating side1To PMNNumber, from A, B and C phase high pressure
Alternating current net side is to high-voltage alternating side converter star contact M, N number of power module PM in each phasing commutator1To PMNModule is numbered successively
For TM1To TMN。
2) the power module quantity N phase in W control cycle T c, in each phasing commutator of number and high-voltage alternating side of W
Together, each control period puts into a power module.To N number of power module PM of high-voltage alternating side A, B and C phasing commutator1Extremely
PMNIt puts by several times, the number of investment is identical with the power module quantity N in each phasing commutator in high-voltage alternating side, puts into k every time
Power module, according to TM1To TMNNumber sequential selection high-voltage alternating side A from small to large, k of each phase of B and C phasing commutator
Power module investment.In the adjacent K power module put into twice, in K power module of rear investment, first module
Number is bigger by 1 than the number of first module in K power module formerly putting into, if the value range of i.e. K=5, N are 10,
In 10 control cycle T c, investment number is TM for the first time1~TM5Power module, second investment number is TM2~TM6's
Power module, third time investment number is TM3~TM7Power module, the 4th investment number is TM4~TM8Power mould
Block, the 5th time investment number is TM5~TM9Power module, the 6th investment number is TM6~TM10Power module.When most
The latter power module TM10It is TM from first number after investment1Module investment, so recycle, i.e., the 7th time investment is numbered
For TM7~TM1,Power module, the 8th investment number is TM8~TM2Power module, the 9th investment number is TM9~
TM3Power module, the tenth investment number is TM10~TM4Power module, altogether put into 10 times.
3) it repeats the above steps using W control cycle T c as the loop control time, until the power module of high and low pressure side is straight
Flow bus capacitor charging complete.
The three-level type AC and DC power electronic transformer circuit topology is as shown in Figure 1, preliminary filling in the embodiment of the present invention
The parameter of electric system is as follows:
Three-phase high-voltage exchanges side line voltage effective value: 10kV；
Bridge arm filter inductance Lga, LgbAnd Lgc: 15mH；
Each phase concatenated power module PM quantity N:5 in high-voltage alternating side；
Each phasing commutator power module mesohigh side dc-link capacitance C in high-voltage alternating sideH: 4mF；
High-pressure side dc-link capacitance voltage rating UH: 1900V；
Low-frequency ac obstructs capacitor CLFB1, CLFB2And CLFB3Capacitance Cres: 44.37 μ F；
High frequency transformer TF1、TF2And TF3Secondary short circuit, primary side measure inductance value Lres: 22.84 μ H；
High frequency transformer TF1、TF2And TF3No-load voltage ratio kTF: 2.53；
Resonance frequency: 5kHz；
Low-pressure side DC side power module SM1、SM2And SM3Low-pressure side dc-link capacitance CL: 3mF；
Low-voltage direct bus capacitor voltage rating UL: 750V；
Step-up transformer TF4No-load voltage ratio: 1.4；
The resistance value of three-phase bypass resistance R1, R2 and R3: 10 Ω；
Absorption Capacitance C1Capacitance: 1600 μ F；
Low-pressure side auxiliary charging circuit ac line voltage virtual value: 380V；
The step of three-level type AC and DC power electronic transformer dc-link capacitance pre-charge method of the present invention, is as follows:
1) three-phase in three-phase high-voltage exchange side contactor S1, low-voltage direct side breaker S2 and auxiliary charging equipment is disconnected
Low voltage AC contactor S3 and three-phase by-pass switch S4；
2) high-voltage alternating side A phase, B phase and C phasing commutator cascade power module PM are unlocked1To PM5Switching tube, and
Low-voltage direct side power module SM1, SM2And SM3Switching tube.In continuous and circulation W control cycle T c, according to from small
To big number order, the k power module investment of each phasing commutator in high-voltage alternating side is selected, k is less than or equal to high-voltage alternating side A
Phase, B phase and C phasing commutator cascade power module quantity N.Make k power module of each phasing commutator in high-voltage alternating side simultaneously
Export the high frequency square wave voltage u of 50% duty ratiosquare, in preceding 0.5 control cycle TCIt is interior, the switch in k power module is connected
Pipe T1And switch transistor T4, in rear 0.5 control cycle TCIt is interior, the switch transistor T of k power module is connected2And T3, remaining N-k power
Module is in excision state.In entirely control cycle T c, switch transistor T is connected2And switch transistor T4, and low-voltage direct side power mould
Block SM1, SM2And SM3Output, with phase square-wave voltage, controls cycle T preceding 0.5 with frequencyCIt is interior, low-voltage direct side power module is connected
SM1, SM2And SM3Switching tube M1With switching tube M4, in rear 0.5 control cycle TCIt is interior, low-voltage direct side power module SM is connected1,
SM2And SM3Switching tube M2With switching tube M3。
3) it is closed three-phase low-voltage A.C. contactor S3, in the process, keeps high-pressure side power module switching tube and low pressure
The power module switching tube of side is in the unlocked state.To each phasing commutator power module PM in high-voltage alternating side1To PMNAnd low-pressure direct
Flow side power module SM1, SM2And SM3Dc-link capacitance voltage when reaching stable, be closed three-phase by-pass switch S4, make high pressure
Exchange each phasing commutator power module PM in side1To PM5Dc-link capacitance voltage rise to rated value UH, low-voltage direct side power
Module SM1, SM2And SM3Dc-link capacitance voltage rise to rated value UL。
4) to the dc-link capacitance voltage of high-pressure side power module and the dc-link capacitance of low side power module electricity
After pressure rises to rated value, disconnecting three-phase low-voltage A.C. contactor S3 and three-phase by-pass switch S4, charging terminates.
According to formula (1), every group determines k power module of investment, the calculation formula of k are as follows:
Wherein, kTFFor the first high frequency transformer TF of three-level type AC and DC power electronic transformer1, the second high frequency transformer
TF2With third high frequency transformer TF3Primary side winding and vice-side winding turn ratio, ULFor low-pressure side dc-link capacitance voltage
Rated value, UHFor high-pressure side dc-link capacitance voltage rating.According to embodiment parameter, control period k=1 can be calculated.
According to formula (2), high and low pressure side inverter power module switch in pre-charge process can be calculated and manage the period processed
The value of Tc:
Wherein, LresFor the first high frequency transformer TF of three-level type AC and DC power electronic transformer1, the second high frequency transformation
Device TF2With third high frequency transformer TF3Vice-side winding short circuit when the primary side winding inductance value that measures, CresFor three-level type alternating current-direct current
The first low-frequency ac in electric power electric transformer obstructs capacitor CLFB1, the second low-frequency ac barrier capacitor CLFB2With third low frequency
Exchange barrier capacitor CLFB3Capacitance.According to embodiment parameter, control cycle T c=200 μ s can be calculated.
According to formula (3), pre-charge process medium-high frequency square wave u can be calculatedsquareWorking frequency fsquareValue:
Wherein, Tc is pre-charge process mesohigh side inverter power module switch pipe and low-pressure side inverter power module
The control period of switching tube.According to formula (2) calculated result, high frequency square wave u can be calculatedsquareWorking frequency fsquare=
5kHz。
In the step 2), power module investing method is as follows in each phasing commutator in high-voltage alternating side:
1) to N number of power module PM in A, B and the C phasing commutator of high-voltage alternating side1To PM5Number, from A, B and C phase high pressure
Alternating current net side is to high-voltage alternating side converter star contact M, N number of power module PM in each phasing commutator1To PM5Module is numbered successively
For TM1To TM5。
2) in 5 control cycle T c, each control period puts into a power module.To high-voltage alternating side A, B and C phase
5 power module PM of converter1To PM5It puts by several times, puts into 1 power module, in 5 control cycle T c, first every time
Secondary investment number is TM1Power module, second investment number is TM2Power module, third time investment number be TM3's
Power module, the 4th time investment number is TM4Power module, the 5th investment number is TM5Power module.
3) it repeats the above steps using 5 control cycle T c as the loop control time, until the power module of high and low pressure side is straight
Flow bus capacitor charging complete.
Fig. 2 is that mesohigh of the embodiment of the present invention exchanges all power module output voltage simulation waveforms of side A phasing commutator, from
As can be seen that each control cycle T c is 200 μ s, the high-voltage alternating side A phasing commutator within an independent control period in waveform
In only power module export 50% duty ratio high frequency square wave voltage usquare, it is electric that remaining five power module exports 0
Pressure, and every 1ms is that one cycle controls the time.
Fig. 3 is the first power module of mesolow of embodiment of the present invention DC side SM1Output voltage simulation waveform, from waveform
As can be seen that low-voltage direct side power module is persistently exported with high-pressure side with the same phase of frequency in continuous different control cycle T c
High frequency square wave voltage.
Fig. 4 is the first high frequency transformer TF in the embodiment of the present invention1Primary side winding charging current simulation waveform, from emulation wave
It is not difficult to find that charging current is in downward trend in shape, zero current is eventually settled to, and in entire charging process, not
There is biggish rush of current.
Fig. 5 and Fig. 6 is respectively all power module PM direct currents of each phasing commutator in A phase high-voltage alternating side in the embodiment of the present invention
Bus capacitor voltage and low-voltage direct side the first power module SM1Dc-link capacitance voltage simulation waveform.It can be in 0- in figure
The 15s stage, high and low side dc-link capacitance voltage steadily rose to stable state, when in 15s, system bypass is closed the switch,
High and low side dc-link capacitance voltage persistently rises to voltage rating.Ac high-voltage exchanges each phase transformation in side when then and reaching stable state
Dc-link capacitance voltage in all power modules of parallel operation more balancedly maintains rated value.
Claims (6)
1. a kind of three-level type AC and DC power electronic transformer dc-link capacitance pre-charge method, which is characterized in that the side
Method comprises the steps of:
1) three-phase low-voltage in three-phase high-voltage exchange side contactor S1, low-voltage direct side breaker S2 and auxiliary charging equipment is disconnected
A.C. contactor S3 and three-phase by-pass switch S4；
2) high-voltage alternating side A phase, B phase and C phasing commutator cascade power module PM are unlocked1To PMNSwitching tube and low pressure
DC side power module SM1, SM2And SM3Switching tube；In continuous and circulation W high-pressure side inverter power module switch pipe
In the control cycle T c of low-pressure side inverter power module switch pipe, according to number order from small to large, high pressure is selected to hand over
The k power module investment of each phasing commutator in side is flowed, k is less than or equal to high-voltage alternating side A phase, B phase and C phasing commutator cascade function
Rate module number N；Make k power module of each phasing commutator in high-voltage alternating side while exporting the high frequency square wave electricity of 50% duty ratio
Press usquare, in preceding 0.5 control cycle TCIt is interior, the switch transistor T in k power module is connected1And switch transistor T4, in rear 0.5 control
Cycle TCIt is interior, the switch transistor T of k power module is connected2And T3, remaining N-k power module is in excision state；Entirely controlling
In cycle T c processed, switch transistor T is connected2And switch transistor T4, and low-voltage direct side power module SM1, SM2And SM3Output is the same as the same phase of frequency
Square-wave voltage, in preceding 0.5 control cycle TCIt is interior, low-voltage direct side power module SM is connected1, SM2And SM3Switching tube M1And switch
Pipe M4, in rear 0.5 control cycle TCIt is interior, low-voltage direct side power module SM is connected1, SM2And SM3Switching tube M2And switching tube
M3；
3) it is closed three-phase low-voltage A.C. contactor S3, in the process, keeps high-pressure side power module switching tube and low-pressure side
Power module switching tube is in the unlocked state；To each phasing commutator power module PM in high-voltage alternating side1To PMNDC bus electricity
Hold CHVoltage and low-voltage direct side power module SM1, SM2And SM3Dc-link capacitance CLWhen voltage reaches stable, it is closed three-phase
By-pass switch S4 makes each phasing commutator power module PM in high-voltage alternating side1To PMNDc-link capacitance CHVoltage rises to specified
Value UH, low-voltage direct side power module SM1, SM2And SM3Dc-link capacitance CLVoltage rises to rated value UL；
4) to the dc-link capacitance C of high-pressure side power moduleHThe dc-link capacitance C of voltage and low side power moduleLVoltage
After rising to rated value, disconnecting three-phase low-voltage A.C. contactor S3 and three-phase by-pass switch S4, charging terminates.
2. dc-link capacitance pre-charge method according to claim 1, it is characterised in that: the high-pressure side direct current is female
Line capacitance CHFor the bus capacitor of all power modules of each phasing commutator in high-voltage alternating side；The low-pressure side dc-link capacitance
CLFor low-voltage direct side power module SM1, SM2, SM3Bus capacitor.
3. dc-link capacitance pre-charge method according to claim 1, which is characterized in that in the step 2), every time
The calculation formula of the power module quantity k of every phase investment are as follows:
Wherein, kTFFor the first high frequency transformer TF of three-level type AC and DC power electronic transformer1, the second high frequency transformer TF2With
Third high frequency transformer TF3Primary side winding and vice-side winding turn ratio, ULFor low-pressure side dc-link capacitance voltagerating
Value, UHFor high-pressure side dc-link capacitance voltage rating.
4. dc-link capacitance pre-charge method according to claim 1, which is characterized in that the control in the step 2)
Cycle T c are as follows:
Wherein, LresFor the first high frequency transformer TF of three-level type AC and DC power electronic transformer1, the second high frequency transformer TF2
With third high frequency transformer TF3Vice-side winding short circuit when the primary side winding inductance value that measures, CresFor three-level type AC and DC power
The first low-frequency ac in electronic transformer obstructs capacitor CLFB1, the second low-frequency ac barrier capacitor CLFB2With third low-frequency ac
Obstruct capacitor CLFB3Capacitance.
5. dc-link capacitance pre-charge method as described in claim 1, which is characterized in that the high frequency side in the step 2)
Wave voltage usquareWorking frequency fsquareValue are as follows:
Wherein, Tc is pre-charge process mesohigh side inverter power module switch pipe and low-pressure side inverter power module switch
The control period of pipe.
6. dc-link capacitance pre-charge method as described in claim 1, which is characterized in that in the step 2), high pressure is handed over
It is as follows to flow power module investing method in each phasing commutator in side:
1) to N number of power module PM in A, B and the C phasing commutator of high-voltage alternating side1To PMNNumber, from A, B and C phase high-voltage alternating
Net side is to high-voltage alternating side converter star contact M, N number of power module PM in each phasing commutator1To PMNModule number is followed successively by TM1
To TMN；
2) in W control cycle T c, the number of W is identical with the power module quantity N in each phasing commutator in high-voltage alternating side, often
A control period puts into a power module；To N number of power module PM of high-voltage alternating side A, B and C phasing commutator1To PMNBy several times
Investment, the number of investment is identical with the power module quantity N in each phasing commutator in high-voltage alternating side, and every phase puts into k function every time
Rate module, according to TM1To TMNNumber sequential selection high-voltage alternating side A from small to large, k function of each phase of B and C phasing commutator
Rate module investment；In the adjacent K power module put into twice, in K power module of rear investment, the volume of first module
Number bigger by 1 than the number of first module in K power module formerly putting into, i.e., in K=5, the value range of N is 10,10
It controls in cycle T c, investment number is TM for the first time1~TM5Power module, second investment number is TM2~TM6Power
Module, third time investment number is TM3~TM7Power module, the 4th investment number is TM4~TM8Power module,
Five times investment number is TM5~TM9Power module, the 6th investment number is TM6~TM10Power module；When the last one
Power module TM10After investment, then from first number be TM1Module investment, so recycle, i.e., the 7th time investment, which is numbered, is
TM7~TM1, power module, the 8th investment number is TM8~TM2Power module, the 9th investment number is TM9~TM3
Power module, the tenth investment number is TM10~TM4Power module, altogether put into 10 times；
3) it repeats the above steps a) and step b) by the loop control time of W control cycle T c, until on high-tension side power mould
The power module dc-link capacitance charging complete of block dc-link capacitance and low-pressure side.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110138240A (en) * | 2019-05-21 | 2019-08-16 | 中国科学院电工研究所 | Electric power electric transformer high-pressure side dc-link capacitance pre-charge method |
| CN115995804A (en) * | 2023-03-23 | 2023-04-21 | 广州地铁设计研究院股份有限公司 | Urban rail transit flexible direct current distribution system |
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| 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 |
| CN108092518A (en) * | 2017-12-14 | 2018-05-29 | 中国科学院电工研究所 | Three-level type alternating current-direct current mixes three port electric power electric transformers |
| CN108696165A (en) * | 2018-05-31 | 2018-10-23 | 西安西电电力系统有限公司 | A kind of pre-charge method of the modularization multi-level converter of clamp Shuangzi module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106787087A (en) * | 2017-01-09 | 2017-05-31 | 许继集团有限公司 | Hybrid MMC sequences pressure charging method, startup method and device |
| 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 |
| CN108092518A (en) * | 2017-12-14 | 2018-05-29 | 中国科学院电工研究所 | Three-level type alternating current-direct current mixes three port electric power electric transformers |
| CN108696165A (en) * | 2018-05-31 | 2018-10-23 | 西安西电电力系统有限公司 | A kind of pre-charge method of the modularization multi-level converter of clamp Shuangzi module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110138240A (en) * | 2019-05-21 | 2019-08-16 | 中国科学院电工研究所 | Electric power electric transformer high-pressure side dc-link capacitance pre-charge method |
| CN115995804A (en) * | 2023-03-23 | 2023-04-21 | 广州地铁设计研究院股份有限公司 | Urban rail transit flexible direct current distribution system |
| CN115995804B (en) * | 2023-03-23 | 2023-05-26 | 广州地铁设计研究院股份有限公司 | Urban rail transit flexible direct current distribution system |
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