CN114825970B - Control method and device of direct current converter and computer readable storage medium - Google Patents
Control method and device of direct current converter and computer readable storage medium Download PDFInfo
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- CN114825970B CN114825970B CN202210720947.4A CN202210720947A CN114825970B CN 114825970 B CN114825970 B CN 114825970B CN 202210720947 A CN202210720947 A CN 202210720947A CN 114825970 B CN114825970 B CN 114825970B
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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
- H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- 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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Abstract
The invention discloses a control method and device of a direct current converter and a computer readable storage medium, wherein the method comprises the following steps: when the full-bridge direct-current converter is in a transient process, acquiring a first phase shift angle under an initial steady-state condition corresponding to the direct-current converter; acquiring a feedforward output value of feedforward control and a PI output value of PI control corresponding to a DC converter; and determining a first pulse control signal of the primary full-bridge converter and a second pulse control signal of the secondary full-bridge converter based on the first phase shift angle, the feedforward output value and the PI output value. The invention can effectively inhibit the DC bias generated by the inductance current in the power change process, reduce the response time of the transient process of the DC converter, avoid the power supply current from oscillating and overshoot, and enable the power supply current to reach a new steady state more quickly.
Description
Technical Field
The present invention relates to the field of dc converters, and in particular, to a method and apparatus for controlling a dc converter, and a computer readable storage medium.
Background
The Double Active Bridge (DAB) DC converter has the advantages of electric isolation, bidirectional power transmission, high power density and the like, and is widely applied to the fields of energy storage and the like. The DAB type direct current converter mainly comprises a primary side full-bridge converter, a secondary side full-bridge converter and a high-frequency transformer.
At present, most of existing double-active full-bridge direct current converters adopt two-side PWM control, and inductance current can generate direct current bias in the control process of the traditional PWM control, so that the transient process of the direct current converter is long in response time and poor in response.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide a control method and device of a direct current converter and a computer readable storage medium, and aims to solve the technical problem of poor response of a transient process of a double-active full-bridge direct current converter.
In order to achieve the above object, the present invention provides a control method of a dc converter, the dc converter being a double active full-bridge dc converter, the dc converter including a primary full-bridge converter, a secondary full-bridge converter, and a high-frequency transformer, the high-frequency transformer being electrically connected to the primary full-bridge converter and the secondary full-bridge converter, respectively, the control method of the dc converter comprising the steps of:
when the full-bridge direct-current converter is in a transient process, acquiring a first phase shift angle under an initial steady-state condition corresponding to the direct-current converter;
acquiring a feedforward output value of feedforward control and a PI output value of PI control corresponding to a DC converter;
and determining a first pulse control signal of the primary full-bridge converter and a second pulse control signal of the secondary full-bridge converter based on the first phase shift angle, the feedforward output value and the PI output value.
Further, the step of determining the first pulse control signal of the primary full-bridge converter and the second pulse control signal of the secondary full-bridge converter based on the first phase shift angle, the feedforward output value, and the PI output value comprises:
determining a second phase shift angle under a target steady state condition corresponding to the direct current converter based on the feedforward output value and the PI output value;
the first pulse control signal and the second pulse control signal are determined based on the first phase shift angle and the second phase shift angle.
Further, the step of determining the first pulse control signal and the second pulse control signal based on the first phase shift angle and the second phase shift angle comprises:
determining a primary positive pulse width and a primary negative pulse width of the first pulse control signal by a pulse modulator based on the first phase shift angle and the second phase shift angle;
and determining the secondary positive pulse width of the second pulse control signal through a pulse modulator based on the first phase shift angle and the second phase shift angle.
Further, the step of determining, by the pulse modulator, the primary positive pulse width and the primary negative pulse width of the first pulse control signal based on the first phase shift angle and the second phase shift angle includes:
determining a phase shift angle parameter by a pulse modulator based on the first phase shift angle, the second phase shift angle, and a voltage conversion ratio of the dc converter;
and taking the sum of a preset constant and the phase-shift angle parameter as the primary positive pulse width through a pulse modulator, and taking the difference between the preset constant and the phase-shift angle parameter as the primary negative pulse width through the pulse modulator.
Further, the step of determining the first pulse control signal and the second pulse control signal based on the first phase shift angle and the second phase shift angle comprises:
determining a phase shift angle parameter by a pulse modulator based on the first phase shift angle, the second phase shift angle, and a voltage conversion ratio of the dc converter;
taking the difference between a preset constant and the phase-shift angle parameter as the primary positive pulse width through a pulse modulator, and taking the sum of the preset constant and the phase-shift angle parameter as the primary negative pulse width through the pulse modulator;
and determining the secondary negative pulse width of the second pulse control signal through a pulse modulator based on the first phase shift angle and the second phase shift angle.
Further, the step of obtaining a feedforward output value of feedforward control corresponding to the dc converter includes:
obtaining a current set value, a working frequency and an inductance corresponding to the direct current converter, and obtaining the number of turns of a primary side and the number of turns of a secondary side of the high-frequency transformer and the voltage of the secondary side corresponding to the secondary side full-bridge converter;
the feedforward output value is determined based on the current set point, operating frequency, inductance, secondary voltage, primary turns, and secondary turns.
Further, the primary full-bridge converter comprises a first direct-current power supply, a first primary switch unit, a second primary switch unit, a third primary switch unit and a fourth primary switch unit;
the first primary side switch unit and the second primary side switch unit are connected in series to form a first branch, the third primary side switch unit and the fourth primary side switch unit are connected in series to form a second branch, and the first branch and the second branch are connected in parallel to form the primary side full-bridge converter;
the first connection point of the first primary side switch unit and the third primary side switch unit, and the second connection point of the second primary side switch unit and the fourth primary side switch unit are respectively and electrically connected with the first direct current power supply;
and a third connection point of the first primary side switch unit and the second primary side switch unit and a fourth connection point of the third primary side switch unit and the fourth primary side switch unit are respectively and electrically connected with the high-frequency transformer.
Further, the secondary full-bridge converter comprises a second direct-current power supply, a first secondary side switch unit, a second secondary side switch unit, a third secondary side switch unit and a fourth secondary side switch unit;
the first secondary side switch unit and the second secondary side switch unit are connected in series to form a third branch, the third secondary side switch unit and the fourth secondary side switch unit are connected in series to form a fourth branch, and the third branch and the fourth branch are connected in parallel to form the secondary side full bridge converter;
a fifth connection point of the first secondary side switch unit and the third secondary side switch unit, and a sixth connection point of the second secondary side switch unit and the fourth secondary side switch unit are respectively and electrically connected with the second direct current power supply;
and a seventh connection point of the first secondary side switch unit and the second switch unit, and an eighth connection point of the third secondary side switch unit and the fourth secondary side switch unit are respectively and electrically connected with the high-frequency transformer.
In addition, in order to achieve the above object, the present invention also provides a control device for a dc converter, including: the control method comprises the steps of a memory, a processor and a control program of a direct current converter, wherein the control program of the direct current converter is stored in the memory and runs on the processor, and the control program of the direct current converter is executed by the processor to realize the control method of the direct current converter.
In addition, in order to achieve the above object, the present invention provides a computer-readable storage medium having stored thereon a control program of a dc converter, which when executed by a processor, implements the steps of the control method of a dc converter described above.
The method comprises the steps of obtaining a first phase shift angle under an initial steady state condition corresponding to the full-bridge direct current converter when the full-bridge direct current converter is in a transient process; then, a feedforward output value of feedforward control and a PI output value of PI control corresponding to the direct current converter are obtained; and then, based on the first phase shift angle, the feedforward output value and the PI output value, determining a first pulse control signal of the primary full-bridge converter and a second pulse control signal of the secondary full-bridge converter, and adjusting the pulse control signal of the direct-current converter according to the first phase shift angle, the feedforward output value and the PI output value to effectively inhibit direct-current bias generated by inductance current in the power change process, reduce the response time of the transient process of the direct-current converter, and avoid oscillation and overshoot of the power supply current during power switching, so that the power supply current can reach a new steady state more quickly, and the stability, the rapidity and the accuracy of the direct-current converter can be improved through feedforward control. And is also suitable for reversing power conversion.
Drawings
Fig. 1 is a schematic structural diagram of a control device of a dc converter in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a flow chart of a control method of a DC converter according to a first embodiment of the present invention;
fig. 3 is a schematic circuit structure of a dc converter in the control method of the dc converter according to the present invention;
FIG. 4 is a schematic waveform diagram of a control method of a DC converter according to a third embodiment of the present invention;
FIG. 5 is a schematic waveform diagram of a control method of a DC converter according to a fourth embodiment of the present invention;
FIG. 6 is a schematic diagram of experimental waveforms of an embodiment of a control method of a DC converter according to the present invention;
FIG. 7 is a schematic diagram of experimental waveforms of a control method of a DC converter according to another embodiment of the present invention;
fig. 8 is a schematic diagram of experimental waveforms in another embodiment of a control method of a dc converter according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a control device of a dc converter in a hardware operating environment according to an embodiment of the present invention.
The control device of the direct current converter in the embodiment of the invention can be a PC, a controller arranged on a double-active full-bridge direct current converter and the like.
As shown in fig. 1, the control device of the dc converter may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the termination structure shown in fig. 1 does not constitute a limitation of the control means of the dc converter and may comprise more or fewer components than shown, or may combine certain components, or may have a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and a control program of the dc converter may be included in the memory 1005 as one type of computer storage medium.
In the control device of the dc converter shown in fig. 1, the network interface 1004 is mainly used for connecting to a background server and performing data communication with the background server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be used to invoke the control program of the dc converter stored in the memory 1005.
In this embodiment, a control device for a dc converter includes: the control method comprises a memory 1005, a processor 1001 and a control program of the direct current converter stored in the memory 1005 and running on the processor 1001, wherein when the processor 1001 calls the control program of the direct current converter stored in the memory 1005, the steps of the control method of the direct current converter in the following embodiments are executed.
The invention further provides a control method of the dc converter, referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the control method of the dc converter of the invention.
In this embodiment, referring to fig. 3, the dc converter is a double active full-bridge dc converter, and the dc converter includes a primary full-bridge converter, a secondary full-bridge converter, and a high-frequency transformer, and the high-frequency transformer is electrically connected to the primary full-bridge converter and the secondary full-bridge converter, respectively.
Wherein, referring to fig. 3, the primary full-bridge converter comprises a first direct current power V A A first primary side switch unit S 1 A second primary side switch unit S 2 Third primary side switch unit S 3 Fourth primary side switch unit S 4 ；
The first primary side switch unit S 1 And the second primary side switch unit S 2 A first branch is formed by series connection, and the third primary side switch unit S 3 And the fourth primary side switch unit S 4 The first branch and the second branch are connected in parallel to form the primary full-bridge converter;
the first primary side switch unit S 1 And the third primary side switch unit S 3 And the second primary side switch unit S 2 And the fourth primary side switch unit S 4 Respectively with the first DC power supply V A Electrically connecting;
the first primary side switch unit S 1 And the second primary side switch unit S 2 Is connected with the third connection point of the third primary side switch unit S 3 And the fourth primary side switch unit S 4 Is electrically connected with the high frequency transformer, in particular, the third connection point is connected with the high frequency transformer through an inductance L a Is electrically connected with one input end of the high-frequency transformer, and the fourth connection point is electrically connected with the other input end of the high-frequency transformer.
Preferably, the primary full-bridge converter further comprises a first capacitor C 1 The first capacitor C 1 Is electrically connected with the first connection point and the second connection point respectively.
Referring to fig. 3, the secondary full bridge converter includes a second dc power supply V B A first secondary side switch unit S 5 A second secondary switch unit S 6 Third secondary side switch unit S 7 Fourth secondary side switch unit S 8 ；
The first secondary side switch unit S 5 And the second auxiliary side switch unit S 6 A third branch is formed by series connection, the third secondary side switch unit S 7 And the fourth secondary side switch unit S 8 The third branch is connected with the fourth branch in parallel to form the secondary full-bridge converter;
the first secondary side switch unit S 5 And the third secondary side switch unit S 7 Is connected with the second secondary switch unit S 6 And the fourth secondary side switch unit S 8 Respectively with the second DC power supply V B Electrically connecting;
the first secondary side switch unit S 5 And the second switch unit S 6 Seventh connection of (2)Contact, and the third secondary side switch unit S 7 And the fourth secondary side switch unit S 8 The eighth connection point of the high-frequency transformer is electrically connected with the high-frequency transformer respectively, and the seventh connection point and the eighth connection point are electrically connected with two output ends of the high-frequency transformer respectively.
Wherein the secondary full-bridge converter further comprises a second capacitor C 2 The method comprises the steps of carrying out a first treatment on the surface of the The second capacitor C 2 Are electrically connected to the fifth connection point and the sixth connection point, respectively.
In this embodiment, the control method of the dc converter includes:
step S101, when the full-bridge direct-current converter is in a transient process, acquiring a first phase shift angle under an initial steady-state condition corresponding to the direct-current converter;
in this embodiment, when the full-bridge dc converter is in a transient state process, a first phase shift angle under an initial steady state condition corresponding to the dc converter is obtained, where the first phase shift angle is a phase shift difference angle required under the initial steady state condition. The closed-loop control structure of the direct current converter comprises a pulse modulator, and the first phase shift angle can be obtained through the pulse modulator.
Step S102, a feedforward output value of feedforward control and a PI output value of PI control corresponding to a DC converter are obtained;
in this embodiment, the closed-loop control structure of the dc converter includes a feedforward control and a PI control, and when the first phase shift angle and the second phase shift angle are obtained, a feedforward output value of the feedforward control and a PI output value of the PI control are obtained. Specifically, the feedforward control obtains a feedforward output value through feedforward related parameters of the direct current converter, the PI control may be existing PI control, the PI control obtains a PI output value through PI related parameters of the direct current converter, and then the pulse modulator obtains the feedforward output value and the PI output value through the feedforward control and the PI control.
Step S103, determining a first pulse control signal of the primary full-bridge converter and a second pulse control signal of the secondary full-bridge converter based on the first phase shift angle, the feedforward output value and the PI output value.
In this embodiment, when the feedforward output value and the PI output value are obtained, based on the first phase shift angle, the feedforward output value and the PI output value, a first pulse control signal of the primary full-bridge converter and a second pulse control signal of the secondary full-bridge converter are determined, specifically, the pulse modulator generates a first pulse control signal as a switching function of each switching unit in the primary full-bridge converter through the first phase shift angle, the feedforward output value and the PI output value, and simultaneously, the pulse modulator generates a second pulse control signal as a switching function of each switching unit in the secondary full-bridge converter through the first phase shift angle, the feedforward output value and the PI output value, so as to realize control of the double-active full-bridge direct-current converter PWM/PFM.
According to the control method of the direct current converter, when the full-bridge direct current converter is in a transient state process, a first phase shift angle under an initial steady state condition corresponding to the direct current converter is obtained; then, a feedforward output value of feedforward control and a PI output value of PI control corresponding to the direct current converter are obtained; and then, based on the first phase shift angle, the feedforward output value and the PI output value, determining a first pulse control signal of the primary full-bridge converter and a second pulse control signal of the secondary full-bridge converter, and adjusting the pulse control signal of the direct-current converter according to the first phase shift angle, the feedforward output value and the PI output value to effectively inhibit direct-current bias generated by inductance current in the power change process, reduce the response time of the transient process of the direct-current converter, and avoid oscillation and overshoot of the power supply current during power switching, so that the power supply current can reach a new steady state more quickly, and the stability, the rapidity and the accuracy of the direct-current converter can be improved through feedforward control. And is also suitable for reversing power conversion.
Based on the first embodiment, a second embodiment of the control method of the dc converter of the present invention is proposed, in which step S103 includes:
step S201, determining a second phase shift angle under a target steady-state condition corresponding to the direct current converter based on the feedforward output value and the PI output value;
step S202, determining the first pulse control signal and the second pulse control signal based on the first phase shift angle and the second phase shift angle.
In this embodiment, when the feedforward output value and the PI output value are obtained, a second phase shift angle corresponding to the dc converter under the target steady-state condition is determined based on the feedforward output value and the PI output value, where the second phase shift angle is a feedback sum value between the feedforward output value and the PI output value, for example, an adder is provided between a pulse modulator of a closed-loop control structure of the dc converter and the feedforward control and the PI control, the feedforward output value and the PI output value are input to the adder, and the pulse modulator obtains the feedback sum value, which is a sum of the feedforward output value and the PI output value, through the adder.
And then, determining the first pulse control signal and the second pulse control signal through a pulse modulator based on the first phase shift angle and the second phase shift angle, specifically, generating a first pulse control signal which is a switching function of each switching unit in the primary full-bridge converter through the first phase shift angle and the second phase shift angle by the pulse modulator, and simultaneously, generating a second pulse control signal which is a switching function of each switching unit in the secondary full-bridge converter through the first phase shift angle and the second phase shift angle by the pulse modulator to realize the control of the PWM/PFM of the double-active full-bridge DC converter.
According to the control method of the direct current converter, the second phase shift angle of the direct current converter under the corresponding target steady-state condition is determined based on the feedforward output value and the PI output value; and then, based on the first phase shift angle and the second phase shift angle, determining the first pulse control signal and the second pulse control signal, and adjusting the pulse control signal of the direct current converter according to the first phase shift angle and the second phase shift angle, so that direct current bias generated by inductance current in the power change process can be effectively restrained, the response time of the transient process of the direct current converter is reduced, and during power switching, the power supply current is prevented from oscillating and overshooting, so that the power supply current can reach a new steady state more quickly, and the stability, the rapidity and the accuracy of the direct current converter can be improved through feedforward control. And is also suitable for reversing power conversion.
Based on the second embodiment, a third embodiment of the control method of the dc converter of the present invention is provided, in which step S202 includes:
step S301, determining, by a pulse modulator, a primary positive pulse width and a primary negative pulse width of the first pulse control signal based on the first phase shift angle and the second phase shift angle;
step S302, determining, by the pulse modulator, a secondary positive pulse width of the second pulse control signal based on the first phase shift angle and the second phase shift angle.
In this embodiment, the pulse modulator determines the primary positive pulse width and the primary negative pulse width of the first pulse control signal based on the first phase shift angle and the second phase shift angle, and specifically, the step S301 includes:
step S3011, determining a phase shift angle parameter by a pulse modulator based on the first phase shift angle, the second phase shift angle and a voltage conversion ratio of the DC converter;
step S3012, using the sum of the preset constant and the phase-shift angle parameter as the primary positive pulse width, and using the difference between the preset constant and the phase-shift angle parameter as the primary negative pulse width.
In this embodiment, when PFM is a fixed off time, the voltage conversion ratio of the dc converter is first obtained, the pulse modulator determines a phase shift angle parameter based on the first phase shift angle, the second phase shift angle and the voltage conversion ratio, then the pulse modulator calculates a sum of a preset constant and the phase shift angle parameter, uses the sum of the preset constant and the phase shift angle parameter as the primary positive pulse width, calculates a difference between the preset constant and the phase shift angle parameter, and uses a difference between the preset constant and the phase shift angle parameter as the primary negative pulse width.
Next, the secondary positive pulse width of the second pulse control signal is determined by the pulse modulator based on the first phase shift angle and the second phase shift angle, i.e. the pulse modulator determines the secondary positive pulse width based on the preset constant, the first phase shift angle and the second phase shift angle.
Specifically, when PFM is at a fixed off time, the pulse modulator determines the primary positive pulse width φ based on the first phase shift angle and the second phase shift angle distribution p1 Primary side negative pulse width phi p2 And determining the secondary positive pulse width phi s The formulas of (a) are respectively as follows:
wherein M (phi) 2 -φ 1 ) And/2 is the phase shift angle parameter phi 1 For a first phase shift angle phi 2 For the second phase shift angle, M is the voltage conversion ratio, pi is a preset constant, phi p1 Is the pulse width phi of the primary positive pulse p2 Is the pulse width phi of the primary negative pulse s Is the positive pulse width of the secondary side.
The control method of the dc converter of the present embodiment may be applied to eight working conditions of the dc converter, where when PFM is a fixed off time, the eight working conditions may include: the positive power is increased, i.e. is increased by V A To V B And the power is increased; forward power reduction, i.e. energy conversion from V A To V B And the power is reduced; reverse power increase, i.e. energy from V B To V A And the power is increased; reverse power reduction, i.e. energy conversion from V B To V A And the power is reduced; increasing power from positive to negative, i.e. energy from V A To V B Conversion to a form of V B To V A And the power is increased; the power is reduced from positive to negative, i.e. the energy is reduced from V A To V B Conversion to a form of V B To V A And the power is reduced; increasing power from reverse to positive, i.e. energy from V B To V A Conversion to a form of V A To V B And the power is increased; from reverse to positive power reduction, i.e. energy from V B To V A Conversion to a form of V A To V B And the power is reduced. Referring to FIG. 4, wherein i 1 Direct current of primary full-bridge converter, v A Voltage v of primary full bridge converter B Fig. 4 is a waveform diagram showing the increase of forward power when PFM is a fixed off time, which is the voltage of the secondary full-bridge converter.
Referring to fig. 6 to 8, since the voltage matching mode is usually m=1 in practical application, fig. 6 to 8 are experimental waveforms obtained when PFM is at a fixed off time and m=1 are adopted, and in fig. 6 to 8, the waveforms are voltages v of the primary full-bridge converter in order from top to bottom A Voltage v of secondary full bridge converter B、 Inductor current and current (input current) i of primary full-bridge converter 1 Wherein FIG. 6 shows I 1 The experimental waveform of ref set point from-3A to 6A to 4.5A, kp value in PI controller is 0.015 and Ki value is 0.01. FIG. 7 shows I 1 Experimental waveforms of ref set values from-3A to 6A show that the inductor current has no direct current bias in the power switching process and the input current i 1 Steady state is reached after less than 15 cycles without oscillations and overshoot. FIG. 8 shows I 1 Experimental waveforms of ref set values from 6A to 4.5A show that the inductor current has no direct current bias in the power switching process and the input current i 1 Steady state is also reached after less than 15 cycles and without oscillations and overshoot.
According to the control method of the direct current converter, the primary positive pulse width and the primary negative pulse width of the first pulse control signal are determined through the pulse modulator based on the first phase shift angle and the second phase shift angle; and then, based on the first phase shift angle and the second phase shift angle, determining the secondary positive pulse width of the second pulse control signal through the pulse modulator, and adjusting the pulse control signal of the direct current converter according to the first phase shift angle and the second phase shift angle when the PFM is in a fixed closing time, so that the direct current bias generated by the inductance current in the power change process can be effectively restrained, the response time of the transient process of the direct current converter is reduced, and the power supply current is prevented from vibrating and overshooting during power switching, so that the power supply current can reach a new steady state more quickly, and the stability, the rapidity and the accuracy of the direct current converter can be improved through feedforward control. And is also suitable for reversing power conversion.
Based on the second embodiment, a fourth embodiment of the control method of the dc converter of the present invention is proposed, in which step S202 includes:
step S401, determining a phase shift angle parameter by a pulse modulator based on the first phase shift angle, the second phase shift angle and the voltage conversion ratio of the DC converter;
step S402, taking the difference between a preset constant and the phase-shift angle parameter as the primary positive pulse width through a pulse modulator, and taking the sum of the preset constant and the phase-shift angle parameter as the primary negative pulse width through the pulse modulator;
step S403, determining, by the pulse modulator, a secondary negative pulse width of the second pulse control signal based on the first phase shift angle and the second phase shift angle.
In this embodiment, the pulse modulator determines a primary positive pulse width and a primary negative pulse width of the first pulse control signal based on the first phase shift angle and the second phase shift angle, specifically, in this embodiment, when PFM is a fixed on time, a voltage conversion ratio of the dc converter is first obtained, the pulse modulator determines a phase shift angle parameter based on the first phase shift angle, the second phase shift angle and the voltage conversion ratio, then, the pulse modulator calculates a difference between a preset constant and the phase shift angle parameter, and uses the difference between the preset constant and the phase shift angle parameter as the primary positive pulse width, and calculates a sum of the preset constant and the phase shift angle parameter, and uses a sum of the preset constant and the phase shift angle parameter as the primary negative pulse width.
Next, the secondary negative pulse width of the second pulse control signal is determined by the pulse modulator based on the first phase shift angle and the second phase shift angle, i.e. the pulse modulator determines the secondary negative pulse width based on the preset constant, the first phase shift angle and the second phase shift angle.
Specifically, when PFM is a fixed on time, the pulse modulator determines the primary positive pulse width φ based on the first phase shift angle and the second phase shift angle distribution p1 Primary side negative pulse width phi p2 And determining the secondary side negative pulse width phi s The formulas of (a) are respectively as follows:
wherein M (phi) 2 -φ 1 ) And/2 is the phase shift angle parameter phi 1 For a first phase shift angle phi 2 For the second phase shift angle, M is the voltage conversion ratio, pi is a preset constant, phi p1 Is the pulse width phi of the primary positive pulse p2 Is the pulse width phi of the primary negative pulse s Is the negative pulse width of the secondary side.
The control method of the dc converter of the present embodiment may be applied to eight working conditions of the dc converter, where when PFM is a fixed on time, the eight working conditions may include: the positive power is increased, i.e. is increased by V A To V B And the power is increased; forward power reduction, i.e. energy conversion from V A To V B And the power is reduced; reverse power increase, i.e. energy from V B To V A And the power is increased; reverse power reduction, i.e. energy conversion from V B To V A And the power is reduced; increasing power from positive to negative, i.e. energy from V A To V B Conversion to a form of V B To V A And the power is increased; the power is reduced from positive to negative, i.e. the energy is reduced from V A To V B Conversion to a form of V B To V A And the power is reduced; increasing power from reverse to positive, i.e. energy from V B To V A Conversion to a form of V A To V B And workThe rate increases; from reverse to positive power reduction, i.e. energy from V B To V A Conversion to a form of V A To V B And the power is reduced. Referring to FIG. 5, wherein i 1 Direct current of primary full-bridge converter, v A Voltage v of primary full bridge converter B Fig. 5 is a waveform diagram showing the increase of forward power when PFM is a fixed on time, which is the voltage of the secondary full-bridge converter.
According to the control method of the direct current converter, the phase shift angle parameters are determined through the pulse modulator based on the first phase shift angle, the second phase shift angle and the voltage conversion ratio of the direct current converter; then taking the difference between a preset constant and the phase-shifting angle parameter as the primary positive pulse width through a pulse modulator, and taking the sum of the preset constant and the phase-shifting angle parameter as the primary negative pulse width through the pulse modulator; and then, based on the first phase shift angle and the second phase shift angle, the pulse modulator is used for determining the secondary negative pulse width of the second pulse control signal, so that the pulse control signal of the direct current converter can be regulated according to the first phase shift angle and the second phase shift angle when the PFM is the fixed on time, the direct current bias generated by the inductance current in the power change process can be effectively restrained, the response time of the transient process of the direct current converter is reduced, and the power supply current is prevented from vibrating and overshooting during power switching, so that the power supply current can reach a new steady state more quickly, and the stability, the rapidity and the accuracy of the direct current converter can be improved through feedforward control. And is also suitable for reversing power conversion.
Based on the first embodiment, a fifth embodiment of the control method of the dc converter of the present invention is proposed, in which step S102 includes:
step S501, obtaining a current set value, a working frequency and an inductance corresponding to the dc converter, and obtaining a primary side turns and a secondary side turns of the high-frequency transformer, and a secondary side voltage corresponding to the secondary side full-bridge converter;
step S502, determining the feedforward output value based on the current set value, the operating frequency, the inductance, the secondary voltage, the primary turns, and the secondary turns.
In this embodiment, when the first phase shift angle and the second phase shift angle are obtained, the current set value, the operating frequency, and the inductance corresponding to the dc converter are obtained, the primary winding number and the secondary winding number of the high-frequency transformer, and the secondary voltage corresponding to the secondary full-bridge converter are obtained, specifically, parameters such as the current set value, the operating frequency, the inductance, the primary winding number, the secondary winding number, and the secondary voltage are obtained through feedforward control, where the secondary voltage is ± V in fig. 3 B Is a function of the magnitude of (a).
Then, the feedforward control determines the feedforward output value based on the current set point, the operating frequency, the inductance, the secondary voltage, the primary turns and the secondary turns, wherein the formula of the feedforward output value is:
wherein phi is ’ For feedforward output value, I 1ref Input current set point, f for primary side s Is the working frequency, L is the inductance, V B Is the secondary side voltage, n 1 For the number of primary turns and n 2 Is the number of turns of the secondary side.
According to the control method of the direct current converter, the current set value, the working frequency and the inductance corresponding to the direct current converter are obtained, and the primary side turns and the secondary side turns of the high-frequency transformer and the secondary side voltage corresponding to the secondary side full-bridge converter are obtained; and then determining the feedforward output value based on the current set value, the working frequency, the inductor, the secondary side voltage, the primary side turns and the secondary side turns, and obtaining the feedforward output value through the current set value, the working frequency, the inductor, the secondary side voltage, the primary side turns and the secondary side turns, so that the power supply current is prevented from oscillating and overshooting through the feedforward output value, and the power supply current can reach a new steady state more quickly.
The invention also provides a computer readable storage medium.
The computer-readable storage medium of the present invention stores thereon a control program of a dc converter, which when executed by a processor, implements the steps of the control method of a dc converter as described above.
The method implemented when the control program of the dc converter running on the processor is executed may refer to various embodiments of the control method of the dc converter of the present invention, which are not described herein again.
In addition, the embodiment of the invention also provides a computer program product, which comprises a control program of the direct current converter, and the control program of the direct current converter realizes the steps of the control method of the direct current converter when being executed by a processor.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (8)
1. The control method of the direct current converter is characterized in that the direct current converter is a double active full-bridge direct current converter, the direct current converter comprises a primary full-bridge converter, a secondary full-bridge converter and a high-frequency transformer, the high-frequency transformer is respectively electrically connected with the primary full-bridge converter and the secondary full-bridge converter, and the control method of the direct current converter comprises the following steps:
when the full-bridge direct-current converter is in a transient process, acquiring a first phase shift angle under an initial steady-state condition corresponding to the direct-current converter;
acquiring a feedforward output value of feedforward control and a PI output value of PI control corresponding to a DC converter;
determining a second phase shift angle under a target steady state condition corresponding to the direct current converter based on the feedforward output value and the PI output value;
determining a primary positive pulse width and a primary negative pulse width of a first pulse control signal through a pulse modulator based on the first phase shift angle and the second phase shift angle;
a second pulse control signal is determined by the pulse modulator based on the first phase shift angle and the second phase shift angle.
2. The method of controlling a dc converter according to claim 1, wherein the step of determining the primary positive pulse width and the primary negative pulse width of the first pulse control signal and the second pulse control signal by a pulse modulator based on the first phase shift angle and the second phase shift angle includes:
determining a phase shift angle parameter by a pulse modulator based on the first phase shift angle, the second phase shift angle, and a voltage conversion ratio of the dc converter;
taking the sum of a preset constant and the phase-shifting angle parameter as the primary positive pulse width through a pulse modulator, and taking the difference between the preset constant and the phase-shifting angle parameter as the primary negative pulse width through the pulse modulator;
and adding the difference between the second phase shift angle and the first phase shift angle and a preset constant through a pulse modulator based on the first phase shift angle and the second phase shift angle to obtain the secondary positive pulse width of the second pulse control signal.
3. The method of controlling a dc converter according to claim 1, wherein the step of determining the first pulse control signal and the second pulse control signal based on the first phase shift angle and the second phase shift angle includes:
determining a phase shift angle parameter by a pulse modulator based on the first phase shift angle, the second phase shift angle, and a voltage conversion ratio of the dc converter;
taking the difference between a preset constant and the phase-shift angle parameter as the primary positive pulse width through a pulse modulator, and taking the sum of the preset constant and the phase-shift angle parameter as the primary negative pulse width through the pulse modulator;
and adding the difference between the second phase shift angle and the first phase shift angle with a preset constant through a pulse modulator based on the first phase shift angle and the second phase shift angle to obtain the secondary negative pulse width of the second pulse control signal.
4. The method for controlling a dc converter according to claim 1, wherein the step of obtaining a feedforward output value of a feedforward control corresponding to the dc converter includes:
obtaining a current set value, a working frequency and an inductance corresponding to the direct current converter, and obtaining the number of turns of a primary side and the number of turns of a secondary side of the high-frequency transformer and the voltage of the secondary side corresponding to the secondary side full-bridge converter;
the feedforward output value is determined based on the current set point, operating frequency, inductance, secondary voltage, primary turns, and secondary turns.
5. The control method of a dc converter according to any one of claims 1 to 4, wherein the primary full-bridge converter includes a first dc power supply, a first primary switching unit, a second primary switching unit, a third primary switching unit, and a fourth primary switching unit;
the first primary side switch unit and the second primary side switch unit are connected in series to form a first branch, the third primary side switch unit and the fourth primary side switch unit are connected in series to form a second branch, and the first branch and the second branch are connected in parallel to form the primary side full-bridge converter;
the first connection point of the first primary side switch unit and the third primary side switch unit, and the second connection point of the second primary side switch unit and the fourth primary side switch unit are respectively and electrically connected with the first direct current power supply;
and a third connection point of the first primary side switch unit and the second primary side switch unit and a fourth connection point of the third primary side switch unit and the fourth primary side switch unit are respectively and electrically connected with the high-frequency transformer.
6. The method of controlling a dc converter according to claim 5, wherein the secondary full-bridge converter includes a second dc power supply, a first secondary switching unit, a second secondary switching unit, a third secondary switching unit, and a fourth secondary switching unit;
the first secondary side switch unit and the second secondary side switch unit are connected in series to form a third branch, the third secondary side switch unit and the fourth secondary side switch unit are connected in series to form a fourth branch, and the third branch and the fourth branch are connected in parallel to form the secondary side full bridge converter;
a fifth connection point of the first secondary side switch unit and the third secondary side switch unit, and a sixth connection point of the second secondary side switch unit and the fourth secondary side switch unit are respectively and electrically connected with the second direct current power supply;
the seventh connection point of the first secondary side switch unit and the second secondary side switch unit, and the eighth connection point of the third secondary side switch unit and the fourth secondary side switch unit are respectively electrically connected with the high-frequency transformer.
7. A control device for a dc converter, the control device comprising: a memory, a processor, and a control program of a dc converter stored on the memory and running on the processor, which when executed by the processor, implements the steps of the control method of a dc converter according to any one of claims 1 to 6.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a control program of a dc converter, which, when executed by a processor, realizes the steps of the control method of a dc converter according to any one of claims 1 to 6.
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| CN114649957A (en) * | 2022-04-27 | 2022-06-21 | 苏州汇川控制技术有限公司 | Phase shift modulation method, module, system and storage medium |
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| CN110995000A (en) * | 2019-09-16 | 2020-04-10 | 深圳大学 | Method and device for suppressing DC offset of DAB converter and storage medium |
| CN113037097A (en) * | 2021-04-29 | 2021-06-25 | 常熟理工学院 | Modulation control method of resonant double-active-bridge converter |
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