CN110391747A - A kind of high step-up ratio isolation DC-DC converter topology and its control method - Google Patents
A kind of high step-up ratio isolation DC-DC converter topology and its control method Download PDFInfo
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- CN110391747A CN110391747A CN201910671074.0A CN201910671074A CN110391747A CN 110391747 A CN110391747 A CN 110391747A CN 201910671074 A CN201910671074 A CN 201910671074A CN 110391747 A CN110391747 A CN 110391747A
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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
- 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
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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
- 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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
Abstract
Present disclose provides a kind of high step-up ratio isolation DC-DC converter topology and its control methods.Wherein, high step-up ratio isolation DC-DC converter topology, including low-pressure end DC-AC converter, are used to low-pressure end d. c. voltage signal being converted to ac voltage signal；Boosting isolation voltage changing module, low-pressure side winding and the output end of the low-pressure end DC-AC converter are connected in parallel, and the input terminal of high-pressure side winding and resonant network is connected in series；Resonant network is made of inductance L and capacitor C；The output end of the resonant network is connected with the input terminal of high-voltage end converter circuit；High-voltage end converter circuit is used to the ac voltage signal after boosting being converted to d. c. voltage signal.
Description
Technical field
The disclosure belongs to Technics of Power Electronic Conversion technical field more particularly to a kind of high step-up ratio isolation DC-DC converter is opened up
It flutters and its control method.
Background technique
Only there is provided background technical informations relevant to the disclosure for the statement of this part, it is not necessary to so constitute first skill
Art.
With renewable energy continue to develop and the demand of existing electric power network technique upgrading etc., flexible direct current is defeated
The electric following development continues to concentrate on the networking of wind power plant or photovoltaic DC field and concentrates submitting, the interconnection of regional power grid, city
The power Transmission etc. of downtown load, wherein critical issue is how to solve high step-up ratio (it is required that step-up ratio reaches tens of
To hundreds of) DC boosting transformation.
It is non-isolated to eliminate boosting isolating transformer, volume is reduced, but be lost electrical isolation ability simultaneously, needed
Want additional Fault Isolation circuit.Isolated full-bridge converter mainly improves output using multi-module cascade and transformer voltage ratio
Voltage, for needing more sub-module cascade when high step-up ratio boosting, wherein resonance circuit is only used for realizing Sofe Switch, improve
Conversion efficiency；High-power high-voltage DC-DC transformation may be implemented in MMC isolated converter, but also needs more submodule grade
Connection.
Inventors have found that structure is complicated for existing DC-DC converter topological realization high step-up ratio, it is poor for applicability, and
It is unable to satisfy direct current wind power plant or the boosting inverter of required hundreds times of step-up ratios is collected and sent out to photovoltaic DC field high voltage direct current
It is required that.
Summary of the invention
To solve the above-mentioned problems, the first aspect of the disclosure provides a kind of high step-up ratio isolation DC-DC converter and opens up
It flutters, uses boosting isolating transformer, resonant network and high-voltage end converter circuit three-stage cascade boosting mode, there is boosting
Than the advantages that high, structure is simple, practical.
To achieve the goals above, the disclosure adopts the following technical scheme that
A kind of high step-up ratio isolation DC-DC converter topology, comprising:
Low-pressure end DC-AC converter is used to low-pressure end DC voltage being converted to alternating voltage；
Boosting isolation voltage changing module, low-pressure side winding and the output end of the low-pressure end DC-AC converter are connected in parallel,
The input terminal of high-pressure side winding and resonant network is connected in series；
Resonant network is made of inductance L and capacitor C；The output end and high-voltage end converter circuit of the resonant network
Input terminal be connected；
High-voltage end converter circuit is used to the alternating voltage after boosting being converted to DC voltage.
As an implementation, the boosting isolation voltage changing module is single boosting isolating transformer.
As another embodiment, the boosting isolation voltage changing module is made of at least two boosting isolating transformers,
The low-pressure side winding of each boosting isolating transformer uses parallel, and high-pressure side winding uses series connection mode.
The present embodiment is connected in parallel by the low-pressure side winding use of multiple boosting isolating transformers and high-pressure side winding is adopted
With the mode of series connection, the step-up ratio of boosting isolation voltage changing module is improved, improves entire isolation DC-DC converter topology
Boosting efficiency.
As an implementation, the resonant network is made of the inductance L and capacitor C being connected in series.
As an implementation, in the inductance L and capacitor C in the resonant network one of them and resonant network it is defeated
Enter end series connection, another one is in parallel with the output end of resonant network.
As an implementation, the resonant network further includes the first linked switch and the second linked switch, the electricity
To feel L and capacitor C and composition LC series network is connected in series, one end of LC series network is connected with an input terminal of resonant network,
The other end of LC series network is connected with the changeover contact of the second linked switch, and the changeover contact of the first linked switch is connected to electricity
Feel at L and capacitor C point of contact；The normally opened tie point of first linked switch is connected with the normally closed tie point of the second linked switch, and
It is connected with the first output end of resonant network；The second output terminal phase of the normally opened tie point of second linked switch and resonant network
Even.
The present embodiment carries out topology reconstruction by control linked switch, realizes two-way between DC low-voltage and high direct voltage
Power transmission, wherein when enabled linked switch otherwise the power transmission for realizing DC low-voltage to high direct voltage realizes that power is anti-
To transmission.
As an implementation, the high-voltage end converter circuit includes that the filter inductance being connected in series and AC-DC become
Parallel operation.
The second aspect of the disclosure provides a kind of control method of high step-up ratio isolation DC-DC converter topology.
A kind of control method of high step-up ratio isolation DC-DC converter topology, comprising:
Step 1): the end the AC output electric current and its phase of detection low-pressure end DC-AC converter；
Step 2): the end the DC voltage and current of detection low-pressure end DC-AC converter calculates low-pressure end DC-AC converter
Input average active power；Detect the output end voltage of high-voltage end converter；
Step 3): it is poor that both the end DC voltage of the first reference voltage and low-pressure end DC-AC converter is made, and obtains after processing
Unitization control amount U1；It is poor that both reference power and input average active power are made, and unitization control amount U2 is obtained after processing；
It is poor that both output end voltages of second reference voltage and high-voltage end converter are made, and unitization control amount U3 is obtained after processing；Its
In, the absolute value of unitization control amount U1, unitization control amount U2 and unitization control amount U3 are just less than or equal to 1
Number；
Step 4): unitization control amount U1, U2 and U3 are obtained into control amount Ux after three elections switch selects；
Step 5): according to control amount Ux, leading phase potential difference is obtainedAnd according to low-pressure end DC-AC converter
The end AC output electric current phase, and then by power switch tube control unit export low-pressure end DC-AC converter power switch pipe
Control signal.
A kind of control method of high step-up ratio isolation DC-DC converter topology, comprising:
Step 1): the end the AC output electric current and its phase of detection low-pressure end DC-AC converter；
Step 2): the end the DC voltage and current of detection low-pressure end DC-AC converter calculates low-pressure end DC-AC converter
Input average active power；Detect the output end voltage of high-voltage end converter；
Step 3): it is poor that both the end DC voltage of the first reference voltage and low-pressure end DC-AC converter is made, and obtains after processing
Unitization control amount U1；It is poor that both reference power and input average active power are made, and unitization control amount U2 is obtained after processing；
It is poor that both output end voltages of second reference voltage and high-voltage end converter are made, and unitization control amount U3 is obtained after processing；
Step 4): control amount U1, U2 and U3 are obtained into control amount Ux after three elections switch selects；
Step 5): according to control amount Ux, the pulse width θ of three level pulse voltages is obtainedp=cos-1(1-Ux) makes three electricity
The end AC of the advanced low-pressure end DC-AC converter of level pulse voltage phase exports current phaseAngle, and then by power switch tube
The control signal of control unit output low-pressure end DC-AC converter power switch pipe.
A kind of control method of high step-up ratio isolation DC-DC converter topology, comprising:
Step 1: the end the DC voltage and current of detection low-pressure end DC-AC converter calculates low-pressure end DC-AC converter
Input average active power；
Step 2: it is poor that both the end DC voltage of reference voltage and low-pressure end DC-AC converter is made, and first is obtained after processing
Unitization control amount；It is poor that both reference power and obtained input average active power are made, and it is unitization that second is obtained after processing
Control amount；Wherein, the absolute value of the first unitization control amount and the second unitization control amount is the positive number less than or equal to 1；
Step 3: the first unitization control amount and the second unitization control amount are exported into crystalline substance after either-or switch selects
Brake tube control amount；
Step 4: according to thyristor control amount, obtaining the trigger pulse gap periods of thyristor in high-voltage end converter, press
Sequence interval generates corresponding trigger pulse.
The beneficial effect of the disclosure is:
(1) disclosure utilizes the boosting of boosting isolating transformer, resonant network boosting and halfwave rectifier multiplication of voltage, three-level boosting
Very high total step-up ratio may be implemented in cascade；
(2) the topological resonant network of the disclosure be located at boosting isolating transformer and high-voltage rectifier between, can effectively every
Influence from high-voltage end to transformer, boosting isolating transformer itself are not subject to high voltage；
(3) the topology boosting isolating transformer leakage inductance of the disclosure and parasitic parameter can be equivalent to a part of resonant network,
Be easy to boost isolating transformer Parameters Optimal Design and Project Realization；
(4) topology of the disclosure rectifies two poles by resonant network resonance, low-pressure side converter power switch and high-pressure side
Pipe is easily achieved Sofe Switch operation；
(5) disclosure topology high-voltage end converter uses thyristor inverter circuit, and thyristor can directly connect, be effectively reduced
Cost improves reliability；
(6) disclosure realizes that the bidirectional power between DC low-voltage and high direct voltage transmits by topology reconstruction；
(7) disclosure has step-up ratio high compared with existing isolation DC-DC converter, of simple structure and strong practicability.
Detailed description of the invention
The Figure of description for constituting a part of this disclosure is used to provide further understanding of the disclosure, and the disclosure is shown
Meaning property embodiment and its explanation do not constitute the improper restriction to the disclosure for explaining the disclosure.
Fig. 1 is that DC-DC converter structural block diagram is isolated in the high step-up ratio of the embodiment of the present disclosure；
Fig. 2 is a kind of low-pressure end DC-AC converter topology structure of the embodiment of the present disclosure；
Fig. 3 (a) constitutes figure by the isolating transformer that individually boosts for embodiment of the present disclosure boosting isolation voltage changing module；
Fig. 3 (b) constitutes figure by two boosting isolating transformers for embodiment of the present disclosure boosting isolation voltage changing module；
Fig. 3 (c) is embodiment of the present disclosure boosting isolation voltage changing module by three or three or more boosting isolating transformer structures
Cheng Tu；
Fig. 4 (a) is the first topology diagram of embodiment of the present disclosure resonant network；
Fig. 4 (b) is second of topology diagram of embodiment of the present disclosure resonant network；
Fig. 4 (c) is the third topology diagram of embodiment of the present disclosure resonant network；
Fig. 4 (d) is the 4th kind of topology diagram of embodiment of the present disclosure resonant network；
Fig. 4 (e) is the 5th kind of topology diagram of embodiment of the present disclosure resonant network；
Fig. 4 (f) is the 6th kind of topology diagram of embodiment of the present disclosure resonant network；
Fig. 5 (a) is the first topology diagram of embodiment of the present disclosure high-voltage end converter circuit；
Fig. 5 (b) is second of topology diagram of embodiment of the present disclosure high-voltage end converter circuit；
Fig. 6 (a) is embodiment of the present disclosure high-voltage end converter diode and thyristor the first connection type；
Fig. 6 (b) is embodiment of the present disclosure high-voltage end converter diode and thyristor the first connection type；
Fig. 7 is a kind of low pressure of high step-up ratio isolation DC-DC converter of the embodiment of the present disclosure to high-voltage transmission control method；
Fig. 8 is the low-pressure end DC-AC converter output voltage current waveform figure of Fig. 7 control method；
Fig. 9 is that the low pressure of DC-DC converter is isolated to high-voltage transmission controlling party in embodiment of the present disclosure another kind high step-up ratio
Method；
Figure 10 is the low-pressure end DC-AC converter output voltage current waveform figure of Fig. 9 control method；
Figure 11 is a kind of high pressure of high step-up ratio isolation DC-DC converter of the embodiment of the present disclosure to low-voltage transmission controlling party
Method；
Figure 12 is the high-voltage end converter IGBT group signal schematic representation of Figure 11 control method.
Specific embodiment
The disclosure is described further with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the disclosure.Unless another
It indicates, all technical and scientific terms used herein has usual with disclosure person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the disclosure.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
In the disclosure, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", " side ",
The orientation or positional relationship of the instructions such as "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate describing this public affairs
The relative for opening each component or component structure relationship and determination, not refers in particular to either component or element in the disclosure, cannot understand
For the limitation to the disclosure.
In the disclosure, term such as " affixed ", " connected ", " connection " be shall be understood in a broad sense, and indicate may be a fixed connection,
It is also possible to be integrally connected or is detachably connected；It can be directly connected, it can also be indirectly connected through an intermediary.For
The related scientific research of this field or technical staff can determine the concrete meaning of above-mentioned term in the disclosure as the case may be,
It should not be understood as the limitation to the disclosure.
Fig. 1 gives the high step-up ratio isolation DC-DC converter structural block diagram of the embodiment of the present disclosure, it includes low-pressure end
DC-AC converter 1, boosting isolation voltage changing module 2, resonant network 3 and high-voltage end converter circuit 4.The low-pressure end DC-AC
DC low-voltage end of the end DC of converter 1 as high step-up ratio isolation DC-DC converter, the low-pressure end DC-AC transformation
The end device AC connects the primary side winding of the boosting isolation voltage changing module 2, the vice-side winding connection of the boosting isolation voltage changing module 2
The input terminal of the resonant network 3, the output end of the resonant network 3 connects the input terminal of the high-voltage end converter 4, described
High direct voltage end of the output end of high-voltage end converter 4 as high step-up ratio isolation DC-DC converter.
In specific implementation, low-pressure end DC-AC converter 1 can be used full-bridge inverter circuit, half-bridge inverter circuit or
The structures such as neutral-point-clamped formula three-level inverter circuit, those skilled in the art can be specifically chosen according to the actual situation.Fig. 2
Give full-bridge inverter circuit topology diagram.
Wherein, following any structure type can be used in the structure of boosting isolation voltage changing module 2:
Boosting isolation voltage changing module 2 is realized using single boosting isolating transformer, as shown in Fig. 3 (a)；
Boosting isolation voltage changing module 2 is realized using two boosting isolating transformers in parallel, as shown in Fig. 3 (b)；
Boosting is isolated voltage changing module 2 and is realized using the boosting isolating transformer of three or three more parallels, such as Fig. 3
(c) shown in；The low-pressure side winding of multiple boosting isolating transformers of two of them or more uses parallel, high
Side winding is pressed to use series connection mode.
Resonant network 3 is made of inductance L and capacitor C, and specific structure is as follows:
Fig. 4 (a) is the first resonant network connection type, and the first end point of the inductance L connects the resonant network
First input end, the second endpoint of the inductance L connect the first end point of the capacitor C and the first output of the resonant network
End, the second endpoint of the capacitor C connect the second input terminal and second output terminal of the resonant network.
Fig. 4 (b) is second of resonant network connection type, and the first end point of the capacitor C connects the resonant network
First input end, the second endpoint of the capacitor C connect the first output end of the resonant network and the first end of the inductance L
Point, the second endpoint of the inductance L connect the second input terminal and second output terminal of the resonant network.
Fig. 4 (c) is the third resonant network connection type, and the first end point of the inductance L connects the resonant network
First input end, the second endpoint of the inductance L connect the first end point of the capacitor C, the second endpoint connection of the capacitor C
Second input terminal of the first output end of the resonant network, the resonant network is connected with second output terminal.
Fig. 4 (d) is the 4th kind of resonant network connection type, and the first end point of the capacitor C connects the resonant network
First input end, the second endpoint of the capacitor C connect the first end point of the inductance L, the second endpoint connection of the inductance L
Second input terminal of the first output end of the resonant network, the resonant network is connected with second output terminal.
Fig. 4 (e) is the 5th kind of resonant network connection type, and the first end point of the inductance L connects the resonant network
First input end, the conversion that the second endpoint of the inductance L connects the first end point and linked switch Ks-1 of the capacitor C connect
Point, the changeover contact of the second endpoint connection linked switch Ks-2 of the capacitor C, the normal opened contact of the linked switch Ks-1 connect
The normally closed contact of Ks-2 and the first output end of the resonant network are connect, the normal opened contact of the linked switch Ks-2 connects institute
State the second input terminal and second output terminal of resonant network.
Fig. 4 (f) is the 6th kind of resonant network connection type, and the first end point of the capacitor C connects the resonant network
First input end, the conversion that the second endpoint of the capacitor C connects the first end point and linked switch Ks-1 of the inductance L connect
Point, the changeover contact of the second endpoint connection linked switch Ks-2 of the inductance L, the normal opened contact of the linked switch Ks-1 connect
The normally closed contact of Ks-2 and the first output end of the resonant network are connect, the normal opened contact of the linked switch Ks-2 connects institute
State the second input terminal and second output terminal of resonant network.
In Fig. 4 (e), is realized by linked switch Ks-1 and Ks-2 and mutually turned between Fig. 4 (a) and Fig. 4 (b) connection type
It changes, realizes topology reconstruction.
In Fig. 4 (f), is realized by linked switch Ks-1 and Ks-2 and mutually turned between Fig. 4 (c) and Fig. 4 (d) connection type
It changes, realizes topology reconstruction.
The topological structure of high-voltage end converter circuit 4 is made of, wherein described filter inductance Lf and AC-DC converter 5
The first end point of filter inductance Lf connects the first input end of the high-voltage end converter, the second endpoint of the filter inductance Lf
Connect the first end AC of the AC-DC converter 5, the second input terminal connection of the high-voltage end converter, the AC-DC transformation
2nd end AC of device, positive and negative two height of positive and negative two ends DC of the AC-DC converter as the high-voltage end converter
Press DC terminal.Wherein:
Fig. 5 (a) gives the first described AC-DC converter 5, by two diodes D1, D2 and two capacitors C1, C2
It constitutes, wherein D1 connects with D2, and C1 connects with C2, and the anode of the cathode connection C1 of D1 is reconnecting the AC-DC converter 5 just
The end DC, the cathode of the anode connection C2 of D2 reconnect the negative end DC of the AC-DC converter 5, the cathode of the anode connection D2 of D1
Reconnect the first end AC of the AC-DC converter, the anode of the cathode connection C2 of C1 reconnects the of the AC-DC converter
Two ends AC.
Fig. 5 (b) gives second of AC-DC transformation 5, by two thyristor T1, T2, two diodes D1, D2 and
Two capacitors C1, C2 are constituted, wherein T1 and D1 inverse parallel, and T2 and D2 inverse parallel, D1 connect with D2, and C1 connects with C2, D1's
The anode of cathode connection T1 and the anode of C1 reconnect the positive end DC of the AC-DC converter 5, the cathode of the anode connection T2 of D2
Reconnect the negative end DC of the AC-DC converter with the cathode of C2, the cathode of anode connection T1 and the anode of T2 of D1 and D2's
Cathode reconnects the first end AC of the AC-DC converter 5, and the anode of the cathode connection C2 of C1 reconnects the AC-DC transformation
2nd end AC of device 5.
Diode D1 (D2) is diode string, i.e. D1 (D2) is formed by N number of Diode series, as shown in Fig. 6 (a).Brilliant lock
Pipe T1 (T2) is thyristor string, i.e. T1 (T2) is formed by N number of Thyristors in series, and anti-with N number of diode difference one by one
Parallel connection, as shown in Fig. 6 (b).
Fig. 7 gives a kind of low pressure of high step-up ratio isolation DC-DC converter to high-voltage transmission control method, realizes by straight
Low-pressure end is flowed to transmit to the energy at high direct voltage end.The resonant network uses the first/bis-/five/six kinds of resonant network connection sides
Formula Fig. 4 (a), (b), (e) or (f), wherein using the five/six kind of resonant network connection type Fig. 4 (e) or (f) when, the linkage
Switch Ks-1 and Ks-2 normal opened contact closure, thyristor the pipe T1 and T2 of the high-voltage end converter are in blocking, pass through
Control the phase difference between the end the AC output square-wave voltage of low-pressure end DC-AC converter 1 and electric current(voltage-phase leading current
Phase), or the end the AC output square-wave voltage frequency of control low-pressure end DC-AC converter 1, realize the high step-up ratio isolation
DC-DC converter is transmitted from DC low-voltage end to the energy at high direct voltage end.
Its specific steps are as follows:
Step 1: detecting the end the AC output electric current i of the low-pressure end DC-AC converterac1And its phase.
Step 2: detecting the end the DC voltage u of the low-pressure end DC-AC converterdc1With electric current idc1, and by voltage udc1And electricity
Flow idc1Calculate the input average active power P of the low-pressure end DC-AC converter1；Detect the output of the high-voltage end converter
Hold voltage udc2。
Step 3: by the end the DC voltage u of the low-pressure end DC-AC converterdc1With reference voltage udc1 *It is controlled through overvoltage
Obtaining unitization control amount U1 after device W1 processing, (wherein, 1) the unitization absolute value for referring to control amount is less than or equal to；By what is obtained
The input average active power P1With reference power P1 *Unitization control amount U2 is obtained after power controller W2 processing；It will
The output end voltage u of the obtained high-voltage end converterdc2With reference voltage udc2 *It is obtained after voltage controller W3 processing
Unitization control amount U3.
It should be noted that the algorithm for obtaining unitization control amount can be used, PI adjusts algorithm or other existing algorithms come
It realizes, those skilled in the art can be specifically chosen according to the actual situation.
Step 4: obtained control amount U1, U2 and U3 being obtained into control amount Ux after three elections switch K1 selection, and will
Ux is exported to the low-pressure end DC-AC converter power switch pipe control unit UT1.
Step 5: a kind of scheme of the power switch tube control unit UT1 is to obtain institute according to obtained control amount Ux
State leading phase potential differenceAnd according to electric current iac1Phase exports the low-pressure end DC-AC inverter power
The control signal of switching tube.Another scheme of the power switch tube control unit UT1 is the control amount Ux that basis obtains,
The end the AC output square-wave voltage frequency f1 is obtained, the control signal of the low-pressure end DC-AC converter power switch pipe is exported.
Fig. 8 gives the 1 output voltage current waveform figure of low-pressure end DC-AC converter of 7 control method of corresponding diagram, in figure
For voltage uac1Opposed Current iac1Leading phase potential difference.
Fig. 9 gives the low pressure of another high step-up ratio isolation DC-DC converter to high-voltage transmission control method, realization by
It is transmitted to the energy at high direct voltage end at DC low-voltage end.The resonant network is using the first/bis-/five/six kinds of resonant network connections
Mode Fig. 4 (a), Fig. 4 (b), Fig. 4 (e) or Fig. 4 (f), wherein using the five/six kind of resonant network connection type Fig. 4 (e) or Fig. 4
(f) when, the linked switch Ks-1 and Ks-2 normal opened contact are closed, at thyristor the pipe T1 and T2 of the high-voltage end converter 4
In blocking, the end AC by controlling the low-pressure end DC-AC converter exports the pulse width θ of three level pulse voltagesp,
And make the three level pulses voltage-phase in advance the low-pressure end DC-AC converter the end AC output current phaseAngle (It is smaller), realize that the high step-up ratio is isolated DC-DC converter and is transmitted from DC low-voltage end to the energy at high direct voltage end.
Its specific steps are as follows:
Step 1: detecting the end the AC output electric current i of the low-pressure end DC-AC converterac1And its phase.
Step 2: detecting the end the DC voltage u of the low-pressure end DC-AC converterdc1With electric current idc1, and by voltage udc1And electricity
Flow idc1Calculate the input average active power P of the low-pressure end DC-AC converter1；Detect the output of the high-voltage end converter
Hold voltage udc2。
Step 3: by the end the DC voltage u of the low-pressure end DC-AC converterdc1With reference voltage udc1 *It is controlled through overvoltage
Unitization control amount U1 is obtained after device W1 processing；The input average active power P that will be obtained1With reference power P1 *By function
Unitization control amount U2 is obtained after rate controller W2 processing；By the output end voltage u of the obtained high-voltage end converterdc2With
Reference voltage udc2 *Unitization control amount U3 is obtained after voltage controller W3 processing.
Step 4: obtained control amount U1, U2 and U3 being obtained into control amount Ux after three elections switch K1 selection, and will
Ux is exported to the low-pressure end DC-AC converter power switch pipe control unit UT2.
Step 5: the power switch tube control unit UT2 obtains three level pulse according to obtained control amount Ux
The pulse width θ of voltagep(θp=cos-1(1-Ux)), and according to the electric current iac1Phase makes the three level pulses voltage phase
The advanced electric current i in positionac1PhaseAngle (It is smaller), export the control of the low-pressure end DC-AC converter power switch pipe
Signal.
Figure 10 gives the 1 output voltage current waveform figure of low-pressure end DC-AC converter of 9 control method of corresponding diagram, in figureFor voltage uac1Opposed Current iac1Leading phase potential difference (Very little), θpFor voltage uac1Pulse width.
Figure 11 gives the high pressure of high step-up ratio isolation DC-DC converter a kind of to low-voltage transmission control method, realization by
It is transmitted to the energy at DC low-voltage end at high direct voltage end.The resonant network is connected using third/tetra-/five/six kind resonant network
Mode Fig. 4 (c), Fig. 4 (d), Fig. 4 (e) or Fig. 4 (f), wherein using the five/six kind of resonant network connection type Fig. 4 (e) or Fig. 4
(f) when, the linked switch Ks-2 normally closed contact closure, the high-voltage end converter uses second of AC-DC converter
The power switch tube of Fig. 5 (b), the low-pressure end DC-AC converter are in blocking, by controlling described thyristor T1, T2
Trigger pulse gap periods control the end the DC voltage of the low-pressure end DC-AC converter, realize the high step-up ratio isolation
DC-DC converter is transmitted from high direct voltage end to the energy at DC low-voltage end.
Its specific steps are as follows:
Step 1: detecting the end the DC voltage u of the low-pressure end DC-AC converterdc1With electric current idc1, and by voltage udc1And electricity
Flow idc1Calculate the input average active power P of the low-pressure end DC-AC converter1。
Step 2: by the end the DC voltage u of the low-pressure end DC-AC converterdc1With reference voltage udc1* it is controlled through overvoltage
Unitization control amount U4 is obtained after device W4 processing；The input average active power P that will be obtained1With reference power P1* pass through function
Unitization control amount U5 is obtained after rate controller W5 processing.
Step 3: obtained control amount U4 and U5 being obtained into control amount Uy after either-or switch K2 selection, and Uy is defeated
Out to the AC-DC converter thyristor control unit UT3.
Step 4: thyristor control unit UT3 obtains the triggering arteries and veins of described thyristor T1, T2 according to obtained control amount Uy
Gap periods Tc is rushed, and is spaced the trigger pulse for generating described thyristor T1, T2 in order according to Tc.
Figure 12 is the 5 IGBT group signal schematic representation of high-voltage end converter of Figure 11 control method.
Embodiment 1:
A kind of low pressure of high step-up ratio isolation DC-DC converter arrives the Transmission system of high pressure, Fig. 1 mesolow end DC-AC change
Parallel operation 1 is realized by Fig. 2, boosting isolating transformer 2 is realized by Fig. 3, resonant network 3 is realized by Fig. 4 (a) or Fig. 4 (b), high-voltage end
Converter 4 is realized that control method is realized by Fig. 7 or Fig. 8 by Fig. 5 (a).
Embodiment 2:
A kind of high pressure of high step-up ratio isolation DC-DC converter arrives the Transmission system of low pressure, Fig. 1 mesolow end DC-AC change
Parallel operation 1 is realized by Fig. 2, boosting isolating transformer 2 is realized by Fig. 3, resonant network 3 is realized by Fig. 4 (c) or Fig. 4 (d), high-voltage end
Converter 4 is realized that power switch S1, S2, S3 and S4 in Fig. 2 are in blocking, and control method is by Figure 11 reality by Fig. 5 (b)
It is existing.
Embodiment 3:
A kind of bidirectional transmission system of the low pressure of high step-up ratio isolation DC-DC converter to high pressure, Fig. 1 mesolow end DC-
AC converter 1 is realized by Fig. 2, boosting isolating transformer 2 is realized by Fig. 3, resonant network 3 is realized by Fig. 4 (e) or Fig. 4 (f), high
Pressure side converter 4 is realized by Fig. 5 (b).When carrying out power transmission to high pressure from low pressure, the linkage in Fig. 4 (e) or Fig. 4 (f) is opened
Ks-1 and Ks-2 normal opened contact closure is closed, thyristor the pipe T1 and T2 of Fig. 5 (b) is in blocking, and control method is by Fig. 7 or figure
8 realize.When carrying out power transmission to low pressure from high pressure, linked switch Ks-1 and Ks-2 in Fig. 4 (e) or Fig. 4 (f) are normally closed to be connect
Point is closed, and power switch S1, S2, S3 and S4 in Fig. 2 are in blocking, and control method is realized by Figure 11.
The foregoing is merely preferred embodiment of the present disclosure, are not limited to the disclosure, for the skill of this field
For art personnel, the disclosure can have various modifications and variations.It is all within the spirit and principle of the disclosure, it is made any to repair
Change, equivalent replacement, improvement etc., should be included within the protection scope of the disclosure.
Claims (10)
1. a kind of high step-up ratio isolation DC-DC converter topology characterized by comprising
Low-pressure end DC-AC converter is used to low-pressure end DC voltage being converted to alternating voltage；
Boosting isolation voltage changing module, low-pressure side winding and the output end of the low-pressure end DC-AC converter are connected in parallel, high pressure
The input terminal of side winding and resonant network is connected in series；
Resonant network is made of inductance L and capacitor C；The output end of the resonant network is defeated with high-voltage end converter circuit
Enter end to be connected；
High-voltage end converter circuit is used to the alternating voltage after boosting being converted to DC voltage.
2. high step-up ratio isolation DC-DC converter topology as described in claim 1, which is characterized in that the boosting isolation becomes
Die block is single boosting isolating transformer.
3. high step-up ratio isolation DC-DC converter topology as described in claim 1, which is characterized in that the boosting isolation becomes
Die block is made of at least two boosting isolating transformers, and the low-pressure side winding of each boosting isolating transformer, which uses, to be connected in parallel
Mode, high-pressure side winding use series connection mode.
4. high step-up ratio as described in claim 1 isolation DC-DC converter topology, which is characterized in that the resonant network by
The inductance L and capacitor C of series connection are constituted.
5. high step-up ratio isolation DC-DC converter topology as described in claim 1, which is characterized in that in the resonant network
Inductance L and capacitor C in one of them connect with the input terminal of resonant network, another one is in parallel with the output end of resonant network.
6. high step-up ratio isolation DC-DC converter topology as described in claim 1, which is characterized in that the resonant network is also
Including the first linked switch and the second linked switch, the inductance L and capacitor C are connected in series and constitute LC series network, LC series connection
One end of network is connected with an input terminal of resonant network, and the other end of LC series network and the conversion of the second linked switch connect
Point is connected, and the changeover contact of the first linked switch is connected at inductance L and capacitor C point of contact；The normally opened company of first linked switch
Contact is connected with the normally closed tie point of the second linked switch, and is connected with the first output end of resonant network；Second linkage is opened
The normally opened tie point closed is connected with the second output terminal of resonant network.
7. high step-up ratio isolation DC-DC converter topology as described in claim 1, which is characterized in that the high-voltage end transformation
Device circuit includes the filter inductance being connected in series and AC-DC converter.
8. a kind of control method of high step-up ratio isolation DC-DC converter topology as claimed in claim 5, which is characterized in that
Include:
Step 1): the end the AC output electric current and its phase of detection low-pressure end DC-AC converter；
Step 2): the end the DC voltage and current of detection low-pressure end DC-AC converter calculates the input of low-pressure end DC-AC converter
Average active power；Detect the output end voltage of high-voltage end converter；
Step 3): it is poor that both the end DC voltage of the first reference voltage and low-pressure end DC-AC converter is made, and unit is obtained after processing
Change control amount U1；It is poor that both reference power and input average active power are made, and unitization control amount U2 is obtained after processing；By
It is poor that both output end voltages of two reference voltages and high-voltage end converter are made, and unitization control amount U3 is obtained after processing；Wherein, single
The absolute value of positionization control amount U1, unitization control amount U2 and unitization control amount U3 are the positive number less than or equal to 1；
Step 4): unitization control amount U1, U2 and U3 are obtained into control amount Ux after three elections switch selects；
Step 5): according to control amount Ux, leading phase potential difference is obtainedAnd according to the AC of low-pressure end DC-AC converter
The phase of end output electric current, and then by the control of power switch tube control unit output low-pressure end DC-AC converter power switch pipe
Signal processed.
9. a kind of control method of high step-up ratio isolation DC-DC converter topology as claimed in claim 5, which is characterized in that
Include:
Step 1): the end the AC output electric current and its phase of detection low-pressure end DC-AC converter；
Step 2): the end the DC voltage and current of detection low-pressure end DC-AC converter calculates the input of low-pressure end DC-AC converter
Average active power；Detect the output end voltage of high-voltage end converter；
Step 3): it is poor that both the end DC voltage of the first reference voltage and low-pressure end DC-AC converter is made, and unit is obtained after processing
Change control amount U1；It is poor that both reference power and input average active power are made, and unitization control amount U2 is obtained after processing；By
It is poor that both output end voltages of two reference voltages and high-voltage end converter are made, and unitization control amount U3 is obtained after processing；
Step 4): control amount U1, U2 and U3 are obtained into control amount Ux after three elections switch selects；
Step 5): according to control amount Ux, the pulse width θ of three level pulse voltages is obtainedp=cos-1(1-Ux) makes three level arteries and veins
Rush the end the AC output current phase of the advanced low-pressure end DC-AC converter of voltage-phaseAngle, and then controlled by power switch tube
The control signal of unit output low-pressure end DC-AC converter power switch pipe.
10. a kind of control method of high step-up ratio isolation DC-DC converter topology as claimed in claim 4, which is characterized in that
Include:
Step 1: the end the DC voltage and current of detection low-pressure end DC-AC converter calculates the input of low-pressure end DC-AC converter
Average active power；
Step 2: it is poor that both the end DC voltage of reference voltage and low-pressure end DC-AC converter is made, and the first unit is obtained after processing
Change control amount；It is poor that both reference power and obtained input average active power are made, and the second unitization control is obtained after processing
Amount；Wherein, the absolute value of the first unitization control amount and the second unitization control amount is the positive number less than or equal to 1；
Step 3: the first unitization control amount and the second unitization control amount are exported into thyristor after either-or switch selects
Control amount；
Step 4: according to thyristor control amount, obtaining the trigger pulse gap periods of thyristor in high-voltage end converter, in order
Interval generates corresponding trigger pulse.
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