CN108880305A - EMU high frequency AuCT and its control method - Google Patents
EMU high frequency AuCT and its control method Download PDFInfo
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- CN108880305A CN108880305A CN201810834295.0A CN201810834295A CN108880305A CN 108880305 A CN108880305 A CN 108880305A CN 201810834295 A CN201810834295 A CN 201810834295A CN 108880305 A CN108880305 A CN 108880305A
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4807—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode having a high frequency intermediate AC stage
-
- 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
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
-
- 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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac 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
- H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
It includes tandem DC/DC copped wave circuit, high frequency transformer TR1 and TR2, tandem commutating circuit, resonant tank and three-phase inversion circuit that the present invention, which discloses a kind of EMU high frequency AuCT and its control method, AuCT,；Tandem DC/DC copped wave circuit is connected with the primary side of high frequency transformer TR1 and TR2, and tandem commutating circuit is successively passed through on the secondary side of high frequency transformer TR1 and TR2, resonant tank is connected with three-phase inversion circuit；For the zero-current switching for realizing copped wave IGBT, the control mode turned off using copped wave IGBT and resonance IGBT driving pulse in synchronization, copped wave IGBT pulse width is adjusted using cascade stability control algorithm, and resonance IGBT pulsewidth is fixed value；By corresponding topological structure and design of control method, traditional power frequency current transformer can be directly saved, reduces system weight and volume, guarantees auxiliary system working frequency and efficiency, there is high value of practical.
Description
Technical field
The present invention relates to current transformer control technology fields, and in particular to a kind of EMU high frequency AuCT and its control
Method.
Background technique
Auxiliary power supply system provides electric energy, such as air as all electrical equipments of the EMU in addition to traction drive system
The ancillary equipments such as compressor, cooling blower, illumination, broadcast, EMU supplementary controlled system and EMU traction control system one
Sample is the important component of EMU.
With the fast development of China's EMU technology, user is to emu vehicle in operation reliability, comfort, energy conservation
More stringent requirements are proposed for noise reduction etc., and the requirement to EMU auxiliary power supply system is also more stringent, lightweight, efficiently
Change, high frequency have become the developing direction of auxiliary power supply system.
Traditional EMU auxiliary system input voltage is higher, power device used is voltage levels device, causes to assist
The switching frequency of power device is very restricted, while EMU auxiliary power supply system mostly uses traditional power frequency transformation
Device isolation mode, thus traditional auxiliary system there are weight weight, volume is big, noise is high the disadvantages of.
Summary of the invention
Technical problem to be solved by the present invention lies in use Industrial Frequency Transformer isolation mode for existing auxiliary power supply system
Formula has weight weight, bulky defect, a kind of EMU high frequency AuCT and its control method is proposed, using series connection
The high-frequency isolation method of formula DC/DC copped wave and inverter combinational circuit does not need setting Industrial Frequency Transformer by chopping depressuring,
There is many advantages, such as switching frequency is high, high-efficient, light-weight.
The present invention, which is that the following technical solution is employed, to be realized：A kind of EMU high frequency AuCT, including tandem
DC/DC copped wave circuit, high frequency transformer TR1 and TR2, tandem commutating circuit, resonant tank and three-phase inversion circuit；Series connection
Formula DC/DC copped wave circuit is connected with the primary side of high frequency transformer TR1 and TR2, and the secondary side of high frequency transformer TR1 and TR2 successively pass through
Cross tandem commutating circuit, resonant tank is connected with three-phase inversion circuit；
The tandem DC/DC copped wave circuit includes half bridge loop of input filtering loop and tandem；The input filter
Circuit includes filter capacitor CA1, CA2, CA3 and CA4 of input reactance device LAUX and series connection with it connection, to filter out cable
Voltage bring harmonic wave, and inhibit influence of the accessory power supply to Voltage Harmonic；Half bridge loop of tandem includes 4 and cuts
The first half-bridge of composition is connected in series in wave IGBT, i.e. Q1, Q2, Q3 and Q4, Q1 and Q2, and the second half-bridge of composition is connected in series in Q3 and Q4,
First half-bridge and the series connection of the second half-bridge；It is in parallel with the input terminal of the first half-bridge after capacitor CA1 and CA2 series connection, CA3 and CA4 series connection
It is in parallel with the input terminal of the second half-bridge afterwards, the output end of the first half-bridge output end and the second half-bridge respectively with high frequency transformer TR1
Primary side be connected with the primary side of TR2, DC voltage to be cut as square-wave voltage and is delivered to high frequency transformer primary side；
The tandem commutating circuit includes the first rectifier bridge being made of rectifier diode D1, D2, D3 and D4 and rectification
Diode D5, D6, D7 and D8 composition the second rectifier bridge, the first rectifier bridge and the second rectifier bridge series connection, respectively with high frequency transformation
The secondary of device TR1 is connected in secondary with TR2, high frequency transformer secondary voltage is rectified into DC voltage；
The resonant tank includes resonant capacitance CAUC1, CAUC2 and resonance IGBTQ5, IGBTQ6, resonant capacitance CAUC1
It is in parallel with the output end of the first rectifier bridge after connecting with resonance IGBTQ5, resonant capacitance CAUC2 connect with resonance IGBTQ6 after with
The output end of second rectifier bridge is in parallel, to realize the current resonance between resonant inductance Lk and resonant capacitance CAUC, to reduce
The turn-off power loss of copped wave IGBT, the resonant inductance Lk include itself leakage inductance of route leakage inductance, transformer leakage inductance and power device.
Further, the three-phase inversion circuit includes by inversion IGBTQ7 and Q8, inversion IGBTQ9 and Q10 and inversion
Half bridge loop of three-phase and LC type three-phase filter circuit of IGBTQ11 and Q12 composition, the output and one of LC type three-phase filter circuit
The input of electromagnetic interface filter is connected.
Further, output filter circuit, the output filter are connected between the resonant tank and three-phase inversion circuit
Wave circuit includes the reactor LAUC and filter capacitor CADC being connected with the output end of reactor LAUC.
Further, the both ends of the input filtering loop are parallel with voltage sensor TV3, export the both ends of filter circuit
It is connected in parallel to voltage sensor TVDCLINK.
In addition the present invention also proposes a kind of control method based on EMU high frequency AuCT, including：
A, start EMU high frequency AuCT, capacitor CA1-CA4 is pre-charged；
B, after charging complete, driving pulse is sent out simultaneously to copped wave IGBT and resonance IGBT, copped wave IGBT includes Q1-Q4, humorous
The IGBT that shakes includes that Q5 and Q6 are comprised the following control processes during sending out driving pulse：Initial stage driving pulse width is very
It is narrow；
(1) to the PWM phase controlling of the PWM of copped wave IGBT and resonance IGBT：The driving pulse and resonance of copped wave IGBT
The driving pulse of IGBT is turned off in synchronization, to realize copped wave IGBT (Q1-Q4) zero-current switching；
(2) pulse-width controlled of the PWM of the PWM to copped wave IGBT and resonance IGBT：
The pulse width of copped wave IGBT is adjusted by pid control algorithm, and uses Discrete control mode, i.e., at light load,
Use scale parameter, integral parameter and differential parameter for the traditional PID control mode of fixed value；Ratio is being used to join when overloaded
Number, integral parameter and differential parameter are the nonlinear PID controller mode of on-fixed value, and the underloading refers to that present load is less than
20% nominal load；
The pulse width of resonance IGBT, i.e. service time TcrisIt is determined by resonant inductance Lk and resonant capacitance and is fixed not
Become, i.e.,
C, when the voltage of reactor LAUC and capacitor CADC reach certain threshold value, driving pulse is sent out to inversion IGBT, is moved
Vehicle group high frequency AuCT enters normal work stage.
Further, in the step B, the driving pulse of copped wave IGBT and the driving pulse of resonance IGBT are in synchronization
Shutdown, and resonance IGBT meets following three conditions：A, resonance IGBT some time point before copped wave IGBT is turned off is open-minded；B, it cuts
When wave IGBT is turned off, resonance is completed in resonant inductance Lk resonant capacitance corresponding with its, and resonant capacitance is in discharge condition；c,
The discharge current of resonant capacitance, which is greater than, loads required electric current.
Further, in the control process of EMU high frequency AuCT, tandem DC/DC copped wave circuit (1) view
For source converter, three-phase inversion circuit (4) are considered as load converter, if the output impedance of source converter is ZocS, load converter
Input impedance be ZicL, and meet | ZocS| < | ZicL|。
Compared with prior art, the advantages and positive effects of the present invention are：
1, the AuCT that the present invention program proposes is depressured by tandem DC/DC copped wave circuit, can directly save biography
It unites power frequency current transformer, and then reduces the quality and volume of entire current transformer, guarantee auxiliary system working frequency and high-efficient；
2, modularized design is used, the series circuit topology of DC/DC can be changed to parallel connection for low input system
Topology, and do not have to redesign module, it reduces the development cycle of product while realizing the requirement of module high power density, having
Entire electric loop layout may be implemented in limit space, meet highly integrated, the light-weighted growth requirement of current current transformer；
3, since the frequency of the circuit is more much higher than Industrial Frequency Transformer, consequent is that the power consumption of copped wave IGBT can become
Greatly, for this purpose, the current resonance between resonant inductance and resonant capacitance is realized by resonant tank, to reduce the shutdown of copped wave IGBT
Loss；
It 4, is the zero-current switching for realizing copped wave IGBT, using copped wave IGBT and resonance IGBT driving pulse in synchronization
The control mode of shutdown, copped wave IGBT pulse width cascade stability control algorithm and adjust, and resonance IGBT pulsewidth is fixed value；It is logical
Corresponding topological structure and control mode design are crossed, so that the hot efficiency of auxiliary system is reached 95%, efficiency improves about 2%.
Detailed description of the invention
Fig. 1 is the topological structure schematic diagram of AuCT described in the embodiment of the present invention 1；
Fig. 2 is drive pulse waveform schematic diagram described in the embodiment of the present invention 2；
Fig. 3 is the operating mode schematic diagram in Fig. 2 in the t1 period；
Fig. 4 is the operating mode schematic diagram in Fig. 2 in the t2 period；
Fig. 5 is the operating mode schematic diagram in Fig. 2 in the t3 period；
Fig. 6 is the operating mode schematic diagram in Fig. 2 in the t4 period；
Fig. 7 is the operating mode schematic diagram in Fig. 2 in the t5 period；
Fig. 8 is emulation experiment waveform diagram in embodiment 2；
Fig. 9 is 2 cascade converter equivalent model schematic diagram of embodiment；
Wherein, 1, tandem DC/DC resonant tank；2, tandem commutating circuit；3, resonant tank；4, three-phase inversion returns
Road.
Specific embodiment
In order to which the above objects, features and advantages of the present invention is more clearly understood, with reference to the accompanying drawing and implement
The present invention will be further described for example.It should be noted that in the absence of conflict, in embodiments herein and embodiment
Feature can be combined with each other.
Embodiment 1, a kind of EMU high frequency AuCT, the accessory power supply are a kind of powerful tandem types of high-frequency
Novel accessory power supply, due to using soft switch technique and cascading topological structure, so whole system calculates PWM modulation and control
The requirement of method is higher.
As shown in Figure 1, for main circuit topology figure used by the auxiliary converter, including tandem DC/DC copped wave circuit 1
(including input filtering loop), tandem rectification circuit 2, resonance circuit 3, three-phase inverter circuit 4；Tandem DC/DC copped wave
Circuit includes filter capacitor CA1, CA2, CA3 and CA4 and 4 copped wave IGBT of input reactance device LAUX, series connection with it connection
(insulated gate bipolar transistor), i.e. Q1, Q2, Q3 and Q4；The effect of input filtering loop is that filter out cable voltage bring humorous
Wave, while accessory power supply can also be inhibited to influence the harmonic wave of network voltage, the first half-bridge of composition, Q3 and Q4 is connected in series in Q1 and Q2
The second half-bridge of composition, the first half-bridge and the series connection of the second half-bridge is connected in series；It is defeated with the first half-bridge after capacitor CA1 and CA2 series connection
Enter end parallel connection, the output of first half-bridge output end and second half-bridge in parallel with the input terminal of the second half-bridge after CA3 and CA4 connect
End is connected with the primary side of the primary side of high frequency transformer TR1 and TR2 respectively, and DC voltage is cut as square-wave voltage and sent by copped wave IGBT
Give high frequency transformer primary side.
Tandem commutating circuit 2 includes 8 rectifier diode D1-D8, rectifier diode D1, D2, D3 and D4 composition first
Rectifier bridge, the second rectifier bridge of rectifier diode D5, D6, D7 and D8 composition, the first rectifier bridge and the series connection of the second rectifier bridge, will become
Depressor pair side square-wave voltage is rectified into 600V DC voltage；Resonant tank 3 includes resonant capacitance (CAUC1, CAUC2) and resonance
IGBT (Q5, Q6), effect be exactly realize resonant inductance Lk (itself leakage inductance of route leakage inductance, transformer leakage inductance, power device) with
Current resonance between resonant capacitance Cr.Three-phase inversion circuit 4 includes three phase inverter bridge, and 600V DC voltage inversion is by realization
Three-phase 400V alternating voltage.
DC voltage copped wave is square-wave voltage and gives high frequency transformer by the Topology Structure Design copped wave IGBTQ1-Q4
High frequency transformer pair side square wave seamless is 600V DC voltage by chopping depressuring and by tandem commutating circuit by primary side, with
The problem of saving Industrial Frequency Transformer, and then reduce the quality and volume of entire current transformer, but bringing therefrom is the circuit
Frequency is more much higher than Industrial Frequency Transformer, and consequent is that the loss of copped wave IGBT can become larger, for this purpose, passing through resonant tank reality
Current resonance between existing resonant inductance Lk and resonant capacitance, to reduce the turn-off power loss of copped wave IGBT.For low input
The series circuit topology of DC/DC can be changed to topology in parallel by system, and not have to redesign module, reduce the development cycle of product
Entire electric loop layout may be implemented in a limited space, meet at present for the requirement for realizing module high power density simultaneously
Highly integrated, the light-weighted growth requirement of current transformer, useful application value with higher.
Embodiment 2, resonant tank mesh be to realize that copped wave IGBT is able to achieve zero-current switching, key Design is true
Determine the PWM control of resonance IGBT, the present embodiment is based on EMU high frequency AuCT described in embodiment 1, propose it is a kind of its
Corresponding control method, includes the following steps：
Step A, start EMU high frequency AuCT, capacitor CA1-CA4 is pre-charged；
Step B, (voltage sensor TV3 detects its voltage value) after charging complete, simultaneously to copped wave IGBT and resonance IGBT
Driving pulse is sent out, copped wave IGBT includes Q1-Q4, and resonance IGBT includes Q5 and Q6, during sending out driving pulse, including following control
Process processed：Initial stage driving pulse narrower in width；
(1) to the PWM phase controlling of the PWM of copped wave IGBT and resonance IGBT：The driving pulse and resonance of copped wave IGBT
The driving pulse of IGBT is turned off in synchronization, to realize copped wave IGBT (Q1-Q4) zero-current switching, and resonance IGBT is allowed to meet
Three conditions below：(1) resonance IGBT some time point before copped wave IGBT is turned off is open-minded；(2) when copped wave IGBT is turned off, resonance
Resonance is completed in inductance Lk resonant capacitance Cr corresponding with its, and resonant capacitance is in discharge condition；(3) electric discharge of resonant capacitance
Electric current, which is greater than, loads required electric current.
(2) pulse-width controlled of the PWM of the PWM to copped wave IGBT and resonance IGBT：
The pulse width of copped wave IGBT is adjusted by pid control algorithm, and uses Discrete control mode, i.e., at light load,
Use scale parameter, integral parameter and differential parameter for the traditional PID control mode of fixed value；Ratio is being used to join when overloaded
Number, integral parameter and differential parameter are the nonlinear PID controller mode of on-fixed value, and the underloading refers to that present load is less than
20% nominal load；
The pulse width of resonance IGBT, i.e. service time TcrisIt is determined by resonant inductance Lk resonant capacitance Cr corresponding with its
And immobilize (Lk and capacitor the CAUC1 resonance of the first half-bridge, Lk and capacitor the CAUC2 resonance of the second half-bridge), i.e.,
Drive pulse waveform is as shown in Fig. 2, wherein Ip is high frequency transformer primary current, PWM is copped wave IGBT driving arteries and veins
Punching, PWM_cris are resonance IGBT driving pulse, Vres rectifier diode voltage, Icris are resonant capacitance electric current, Vcris is
Resonant capacitor voltage.
Fig. 2 can be seen that the entire duty cycle of copped wave IGBT and resonance IGBT can be divided into 10 periods, due to t6-t10
It is symmetrical with t1-t5.In the course of work, Q2 is opposite with the current direction of Q1, but its process is the same, the first half-bridge and the second half
Bridge series connection, Q1 and Q3 are opened simultaneously, and Q2 and Q4 are opened simultaneously, and Q5 and Q6 are opened simultaneously, below with t1-t5 period working condition, with Q1
It is introduced for turning on and off.
1), operating mode, such as Fig. 3 in the t1 time；
This course of work is half bridge loop conventional mode of operation, and IGBT Q2 is driven, current direction such as arrow institute in figure
Show；
2), operating mode, such as Fig. 4 in the t2 time；
Resonance IGBTQ5 is opened, and resonant inductance Lk and resonant capacitance CAUC1 start resonance, resonance time Tcris, this
When resonant capacitance be rapidly charged, Vcris rapid increase.
3), operating mode in the t3 time, as shown in Figure 5；
Resonant capacitance CAUC1 starts to discharge by the anti-paralleled diode of resonance IGBTQ5, high frequency transformer primary current
It begins to decline, when electric current falls to zero, IGBT Q2 and resonance IGBTQ5 are simultaneously turned off, and IGBT Q2 realizes zero-current switching,
Resonance IGBQ5T realizes zero voltage turn-off.
4), operating mode in the t4 time, as shown in Figure 6；
This stage, resonant capacitance CAUC1 continued to discharge, and all IGBT are turned off.
5, operating mode in the t5 time (see Fig. 7)
Resonant capacitance CAUC1 completes electric discharge, passes through the freewheeling period of rectifier bridge.
According to above procedure, by emulating in matlab/simulink simulation software, discovery copped wave IGBT really can be real
Existing zero-current switching, resonance IGBT realize that zero voltage turn-off, waveform are detailed in Fig. 8.
Step C, (the voltage sensor TVDCLINK inspection when the voltage of reactor LAUC and capacitor CADC reach certain threshold value
Survey its voltage) respectively to send out driving pulse to inversion IGBT, EMU high frequency AuCT enters normal work stage.
In the control process of EMU high frequency AuCT, tandem DC/DC copped wave circuit is source converter, three-phase
Inversion circuit is load converter, emulation and experiments have shown that even if individually converter work be stable, but cascade when it is entire
Cascade system also has unstable situation.Most popular method when to cascade system stability analysis based on converters
It is the input impedance Z based on converter moduleicLOutput impedance ZocS, as shown in figure 9, its design principle is and | ZocS| < | ZicL
|。
So the PID of 2 stage converter takes Discrete control mode to improve Z in control algolithmocSAnd ZicL.It is being lightly loaded
When use traditional PID control；Nonlinear PID controller is being used when overloaded, and nonlinear pid controller can be with detachment system essence
True mathematical model has stronger robustness and adaptability, improves the adaptation range and Control platform of conventional PID controller.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
It imitates embodiment and is applied to other fields, but without departing from the technical solutions of the present invention, according to the technical essence of the invention
Any simple modification, equivalent variations and remodeling to the above embodiments, still fall within the protection scope of technical solution of the present invention.
Claims (7)
1. EMU high frequency AuCT, which is characterized in that including tandem DC/DC copped wave circuit (1), high frequency transformer
TR1 and TR2, tandem commutating circuit (2), resonant tank (3) and three-phase inversion circuit (4)；Tandem DC/DC copped wave circuit
(1) it is connected with the primary side of high frequency transformer TR1 and TR2, tandem rectification is successively passed through on the secondary side of high frequency transformer TR1 and TR2
Circuit (2), resonant tank (3) are connected with three-phase inversion circuit (4)；
The tandem DC/DC copped wave circuit (1) includes half bridge loop of input filtering loop and tandem；The input filter returns
Road includes filter capacitor CA1, CA2, CA3 and CA4 of input reactance device LAUX and series connection with it connection；The tandem half-bridge
Circuit includes 4 copped wave IGBT, i.e. Q1, Q2, Q3 and Q4, and the first half-bridge of composition is connected in series in Q1 and Q2, and Q3 and Q4 are connected in series
Form the second half-bridge, the first half-bridge and the series connection of the second half-bridge；It is in parallel with the input terminal of the first half-bridge after capacitor CA1 and CA2 series connection,
CA3 and CA4 series connection after it is in parallel with the input terminal of the second half-bridge, the output end of the first half-bridge output end and the second half-bridge respectively with height
The primary side of frequency power transformer TR1 is connected with the primary side of TR2, to cut DC voltage for square-wave voltage and be delivered to high frequency transformer
Primary side；
The tandem commutating circuit (2) includes the first rectifier bridge being made of rectifier diode D1, D2, D3 and D4 and rectification two
Pole pipe D5, D6, D7 and D8 composition the second rectifier bridge, the first rectifier bridge and the second rectifier bridge series connection, and respectively with high frequency transformation
The secondary of device TR1 is connected in secondary with TR2, high frequency transformer secondary voltage is rectified into DC voltage；
The resonant tank (3) includes resonant capacitance CAUC1, CAUC2 and resonance IGBTQ5, IGBTQ6, resonant capacitance CAUC1 with
It is in parallel with the output end of the first rectifier bridge after resonance IGBTQ5 series connection, resonant capacitance CAUC2 connect with resonance IGBTQ6 after with the
The output end of two rectifier bridges is in parallel, to realize the current resonance between resonant inductance Lk and corresponding resonant capacitance, is cut with reducing
The turn-off power loss of wave IGBT, the resonant inductance Lk include itself leakage inductance of route leakage inductance, transformer leakage inductance and power device.
2. EMU high frequency AuCT according to claim 1, it is characterised in that：The three-phase inversion circuit (4)
Including half bridge loop of three-phase that is made of inversion IGBTQ7 and Q8, inversion IGBTQ9 and Q10 and inversion IGBTQ11 and Q12 and
The output end of LC type three-phase filter circuit, LC type three-phase filter circuit is connected with the input terminal of an electromagnetic interface filter.
3. EMU high frequency AuCT according to claim 2, it is characterised in that：The resonant tank (3) and three
Output filter circuit is connected between phase inversion circuit (4), the output filter circuit includes reactor LAUC and and reactance
The connected filter capacitor CADC of the output end of device LAUC.
4. EMU high frequency AuCT according to claim 3, it is characterised in that：The two of the input filtering loop
End is parallel with voltage sensor TV3, and the both ends for exporting filter circuit are connected in parallel to voltage sensor TVDCLINK.
5. a kind of control method based on any one of the claim 1-4 EMU high frequency AuCT, which is characterized in that
Including：
A, start EMU high frequency AuCT, capacitor CA1-CA4 is pre-charged；
B, after charging complete, driving pulse is sent out simultaneously to copped wave IGBT and resonance IGBT, copped wave IGBT includes Q1-Q4, resonance
IGBT includes that Q5 and Q6 are comprised the following control processes during sending out driving pulse：
(1) to the PWM phase controlling of the PWM of copped wave IGBT and resonance IGBT：
The driving pulse of copped wave IGBT and the driving pulse of resonance IGBT are turned off in synchronization, to realize copped wave IGBT zero current
Shutdown；
(2) pulse-width controlled of the PWM of the PWM to copped wave IGBT and resonance IGBT：
The pulse width of copped wave IGBT is adjusted by pid control algorithm, and uses Discrete control mode, i.e., at light load, is used
Scale parameter, integral parameter and differential parameter are the traditional PID control mode of fixed value；Scale parameter, product are being used when overloaded
Divide parameter and differential parameter is the nonlinear PID controller mode of on-fixed value, the underloading refers to present load less than 20% volume
Fixed load；
The pulse width of resonance IGBT, i.e. its service time TcrisDetermined by resonant inductance Lk resonant capacitance Cr corresponding with its and
It immobilizes, i.e.,
C, when the voltage of reactor LAUC and capacitor CADC reach certain threshold value, driving pulse, EMU are sent out to inversion IGBT
High frequency AuCT enters normal work stage.
6. the control method of EMU high frequency AuCT according to claim 5, it is characterised in that：The step B
In, the driving pulse of copped wave IGBT and the driving pulse of resonance IGBT are turned off in synchronization, and resonance IGBT meets following three
A condition：A, resonance IGBT some time point before copped wave IGBT is turned off is open-minded；B, copped wave IGBT turn off when, resonant inductance Lk and
Resonance is completed in its corresponding resonant capacitance, and resonant capacitance is in discharge condition；C, the discharge current of resonant capacitance is greater than negative
Electric current needed for carrying.
7. the control method of EMU high frequency AuCT according to claim 5, it is characterised in that：In EMU height
In the control process of frequency AuCT, tandem DC/DC copped wave circuit (1) is considered as source converter, three-phase inversion circuit (4) view
For load converter, if the output impedance of source converter is ZocS, the input impedance of load converter is ZicL, and meet | ZocS|
< | ZicL|。
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