CN115149818B - Current-free bias magnetic quick start control method and system based on expansion phase shift modulation - Google Patents

Current-free bias magnetic quick start control method and system based on expansion phase shift modulation Download PDF

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CN115149818B
CN115149818B CN202210896057.9A CN202210896057A CN115149818B CN 115149818 B CN115149818 B CN 115149818B CN 202210896057 A CN202210896057 A CN 202210896057A CN 115149818 B CN115149818 B CN 115149818B
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phase
bridge
shift
switching device
active
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CN115149818A (en
Inventor
张祯滨
孙孝哲
韩明昊
李�真
叶荣
雷增卷
李智
唐雨晨
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Shandong University
Economic and Technological Research Institute of State Grid Fujian Electric Power Co Ltd
China Three Gorges Fujian Energy Investment Co Ltd
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Shandong University
Economic and Technological Research Institute of State Grid Fujian Electric Power Co Ltd
China Three Gorges Fujian Energy Investment Co Ltd
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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
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The present disclosure belongs to the technical field of dual active bridge converter control, and in particular relates to a method and a system for controlling current-free bias magnetic quick start based on extended phase-shift modulation, comprising: adjusting a switching signal in a first period when a driving signal of the double-active-bridge converter is started, and eliminating current bias generated in a starting stage; according to the magnitude relation between the internal shift ratio of the primary side H bridge of the double-active-bridge converter and the external shift ratio of the primary side H bridge and the secondary side H bridge, analyzing the transmission power equation of the double-active-bridge converter under different working modes under the expansion phase shift modulation; based on the obtained transmission power equation, calculating the optimal shift phase under the constraint of preset current stress to obtain the optimal shift phase in the starting stage; and controlling the non-current bias magnetic quick start of the double-active bridge converter through the obtained optimal shift.

Description

Current-free bias magnetic quick start control method and system based on expansion phase shift modulation
Technical Field
The invention belongs to the technical field of control of double active bridge converters, and particularly relates to a method and a system for controlling current-free magnetic bias quick start based on expansion phase-shift modulation.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The double-active-bridge converter is a typical DC-DC converter topology which can bidirectionally transmit power, is naturally electrically isolated and is easy to realize soft switching, and is widely applied to the scenes of rail transit, fuel cell automobiles, power grid energy storage and the like. Taking the application scenario of the electric system of the fuel cell automobile as an example, the rear-stage motor driving system of the double-active-bridge converter cannot establish voltage by itself, and the output capacitance voltage of the double-active-bridge converter is always zero before starting. The traditional phase-shift modulation control can generate larger surge current in the alternating-current link of the converter, and the current gradually decays to a steady-state value due to parasitic resistance. However, long-term allowance in this case is detrimental to the service life of the switching device and the magnetic element, which ultimately may lead to overheating damage or other malfunctions of the switching device. Therefore, research on a fast start-up strategy capable of eliminating current bias is of great significance for reliable operation of dual active bridge converters and their systems.
The inventor knows that the basic idea of the starting control method of the existing double-active-bridge converter is as follows: blocking the driving signal of the secondary side H bridge of the double active bridge converter in the first stage of starting to enable the double active bridge converter to work in an uncontrolled rectifying mode; the primary H-bridge gradually increases the output power compared to gradually decreasing the inner shift in an open loop manner. When the output side capacitor voltage increases to the maximum rectified voltage, the system will go to the second stage. The stage enables the driving signal output of the secondary side H bridge, the control mode is changed into closed loop output voltage control, and the output voltage is gradually increased to a set value.
The traditional two-stage starting control strategy needs to manually adjust open loop parameters under different load conditions to ensure that the starting speed is increased while suppressing the surge current, so that the control strategy has poor universality; since the rectified voltage has a maximum under load, the maximum may deviate from the final operating point, leading to a premature second stage and thus to an overcurrent.
Disclosure of Invention
In order to solve the above problems, the present disclosure provides a method and a system for rapid starting control without current bias based on extended phase shift modulation, which adjust a switching signal in a first period of starting to eliminate current bias easily generated in a starting stage. And then comprehensively analyzing the running states of the working modes of the extended phase-shifting modulation, and obtaining the optimal phase-shifting ratio under the constraint of given current stress by utilizing the KKT condition, so that the inductance current of the converter is always in the range of maintaining the allowable output current in the whole starting process, the output power is maximized, and compared with the traditional two-stage starting control, the method has no complex parameter-adjusting process and has obvious starting speed improving effect.
According to some embodiments, a first scheme of the present disclosure provides a method for controlling current-free bias fast start based on spread phase shift modulation, which adopts the following technical scheme:
a current-free bias magnetic quick start control method based on extended phase shift modulation comprises the following steps:
adjusting a switching signal in a first period when a driving signal of the double-active-bridge converter is started, and eliminating current bias generated in a starting stage;
according to the magnitude relation between the internal shift ratio of the primary side H bridge of the double-active-bridge converter and the external shift ratio of the primary side H bridge and the secondary side H bridge, analyzing the transmission power equation of the double-active-bridge converter under different working modes under the expansion phase shift modulation;
Based on the obtained transmission power equation, calculating the optimal shift phase under the constraint of preset current stress to obtain the optimal shift phase in the starting stage;
And controlling the non-current bias magnetic quick start of the double-active bridge converter through the obtained optimal shift.
As a further technical limitation, the dual-active bridge converter comprises two H-bridges consisting of 8 power switching devices, two voltage stabilizing filter capacitors, a high-frequency transformer and an auxiliary inductor, each H-bridge comprises 4 power switching devices, the H-bridge with the auxiliary inductor is the primary side of the dual-active bridge converter, the other H-bridge is the secondary side of the dual-active bridge converter, the 4 power switching devices on the primary side of the dual-active bridge converter are started to operate at a duty ratio other than 0.5, the 4 power switching devices on the secondary side of the dual-active bridge converter are started to operate at a duty ratio of 0.5, the primary side of the dual-active bridge converter comprises a first primary side power switching device, a second primary side power switching device, a third primary side power switching device and a fourth primary side power switching device, and an internal shift phase angle is additionally arranged between the first primary side power switching device and the fourth primary side power switching device.
Further, the phase difference between the first primary side power switch device and the fifth primary side power switch device is an outward shift phase difference; for a dual active bridge converter topology, the drive signals for the first primary power switching device and the second primary power switching device, the third primary power switching device and the fourth primary power switching device, and the secondary corresponding switches are 180 ° apart.
Defining the operation mode of the dual active converter as a further technique includes: (a) D 2≤D1≤1、(b)0≤D1≤D2≤1、(c)-1≤D1-1≤D2 is more than or equal to 0 and less than or equal to 0, and (D) -1 is more than or equal to D 2≤D1 -1 is more than or equal to 0; wherein D 1 is the internal shift ratio of the primary H-bridge, i.e., the phase difference between the driving signals of the first primary power switching device and the fourth primary power switching device or the phase difference between the driving signals of the second primary power switching device and the third primary power switching device; d 2 is the phase difference between the first primary power switching device and the fifth primary power switching device as compared to the outward shift of the primary and secondary H-bridges.
Further, the transmission power equation of the dual-active converter under the extended phase-shift modulation in different working modes is as follows:
Wherein, P i is the transmission power of the system in the working mode i, i is { a, b, c, d }; u i is input voltage, U o is output voltage, n is transformer transformation ratio, L is energy storage inductance, and T s is period of a driving signal of the switching device.
As a further technical limitation, under a single phase shift modulation strategy, the duty ratio of the driving signals of the first primary power switch device and the fourth primary power switch device of the primary side H bridge of the converter is adjusted to be 0.25 in a first switch period, and is shifted backwards by 1/4 period; the maximum inductance current I max isWherein U i is input voltage, L is energy storage inductance, and T s is period of driving signal of the switching device.
As a further technical limitation, the duty ratio of the driving signals of the third primary side power switch device and the fourth primary side power switch device of the primary side H bridge of the converter is reduced under the condition of expanding the phase shift modulation strategyAnd correspondingly moves backwards, and the internal shift phase/>, of the primary side H bridge after the driving signal is changedFor/>The maximum inductance current I max isWherein D 1 is the internal shift of the primary H-bridge, U i is the input voltage, U 1 represents the ac side output voltage of the primary H-bridge, L is the energy storage inductance, and T s is the period of the switching device driving signal.
As a further technical definition, the process of obtaining the optimal shift phase of the start-up phase is:
determining an inductance current peak value when the transmission power is maximum under the unconstrained condition;
Determining the maximum allowable inductance current in the starting stage according to the requirements of safe operation, the cooling performance of the device and the like; if the maximum allowable current is larger than the obtained inductance current peak value, directly outputting the optimal shift phase, otherwise, entering the next step;
Based on the KKT condition and the determined maximum allowable inductance current, obtaining a local optimal solution of the phase shift ratio in each working mode, and judging whether the obtained local optimal solution meets the constraint condition of the mode;
Substituting the optimal solution combination meeting the constraint condition into transmission power equations in different modes, and judging a global optimal solution for maximizing transmission power.
According to some embodiments, a second scheme of the present disclosure provides a current-free bias fast start control system based on extended phase shift modulation, which adopts the following technical scheme:
a current-free bias fast start control system based on extended phase shift modulation, comprising:
an adjustment module configured to adjust a switching signal in a first period when the dual active bridge inverter drive signal is enabled, eliminating a current bias generated during the enabling phase;
The analysis module is configured to analyze transmission power equations of the double-active-bridge converter under different working modes under the extended phase-shifting modulation according to the magnitude relation between the internal shift ratio of the primary side H bridge and the external phase shift ratio of the primary side H bridge and the secondary side H bridge of the double-active-bridge converter;
a calculation module configured to calculate an optimal shift phase under a preset current stress constraint based on the obtained transmission power equation, resulting in an optimal shift phase for a start-up phase;
a control module configured to control a current-free bias fast start of the dual active bridge converter by the resulting optimal shift ratio.
According to some embodiments, a third aspect of the present disclosure provides a computer-readable storage medium, which adopts the following technical solutions:
A computer readable storage medium having stored thereon a program which when executed by a processor performs the steps in a method of extended phase shift modulation based current free bias fast start control according to the first aspect of the present disclosure.
According to some embodiments, a fourth aspect of the present disclosure provides an electronic device, which adopts the following technical solutions:
An electronic device comprising a memory, a processor and a program stored on the memory and executable on the processor, the processor implementing the steps in the method for spread phase shift modulation based current free bias fast start control according to the first aspect of the present disclosure when the program is executed.
Compared with the prior art, the beneficial effects of the present disclosure are:
Aiming at the problems of low starting speed, complex parameter adjustment and the like of a classical two-stage starting control method of a double-active bridge converter, the current-free magnetic bias quick starting control strategy based on expansion phase-shifting modulation is provided, and the effects of eliminating the starting magnetic bias and improving the starting speed are achieved; for the problem of direct current magnetic bias generated in the starting stage of the double-active bridge converter, a starting magnetic bias eliminating method suitable for various phase shift modulation is obtained through adjusting a switch driving signal. For the problem of slower starting speed of the traditional two-stage control strategy, the operation states of all working modes of the extended phase-shifting modulation are comprehensively analyzed, and the optimal phase-shifting ratio under the given current stress constraint is obtained by utilizing the KKT condition, so that the inductance current of the converter is always in the range of the allowable output current in the whole starting process, the output power is maximized, the complex parameter adjusting process is avoided, and the starting speed is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the exemplary embodiments of the disclosure and together with the description serve to explain the disclosure, and do not constitute an undue limitation on the disclosure.
FIG. 1 is a flow chart of a method for a current-free bias fast start control based on extended phase shift modulation in a first embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a topology of a dual active bridge converter in accordance with a first embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a driving signal waveform of a single phase shift modulated primary side switch in a start-up phase in accordance with a first embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a driving signal waveform of a start-up phase spread phase shift modulated primary side switch in accordance with a first embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a single phase shift modulated DC bias suppression waveform during a start-up phase in accordance with an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a start-up phase spread phase shift modulated DC bias suppression waveform in accordance with an embodiment of the present disclosure;
fig. 7 is a block diagram of a current bias free fast start control system based on extended phase shift modulation in a second embodiment of the present disclosure.
Detailed Description
The disclosure is further described below with reference to the drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments in accordance with the present disclosure. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Embodiments of the present disclosure and features of embodiments may be combined with each other without conflict.
Example 1
The first embodiment of the disclosure introduces a current-free bias magnetic quick start control method based on extended phase-shift modulation.
The method for controlling the rapid starting of the no-current bias magnetic based on the expansion phase shift modulation shown in the figure 1 comprises the following steps:
adjusting a switching signal in a first period when a driving signal of the double-active-bridge converter is started, and eliminating current bias generated in a starting stage;
according to the magnitude relation between the internal shift ratio of the primary side H bridge of the double-active-bridge converter and the external shift ratio of the primary side H bridge and the secondary side H bridge, analyzing the transmission power equation of the double-active-bridge converter under different working modes under the expansion phase shift modulation;
Based on the obtained transmission power equation, calculating the optimal shift phase under the constraint of preset current stress to obtain the optimal shift phase in the starting stage;
And controlling the non-current bias magnetic quick start of the double-active bridge converter through the obtained optimal shift.
The key point of the embodiment is to realize the control purpose of fast starting without current bias by changing the driving signal of the switch of the dual-active bridge converter in the starting stage. The invention is based on a control mode of the double active bridge converter expansion phase shift modulation, and the control target which limits the induction current stress and realizes the maximum power transmission is converted into an optimization problem to be analyzed and solved, so that the induction current is controlled and the output power is maximized at the same time. The basic principle of eliminating the current bias in the starting stage and the basic flow of the control strategy will be explained below from the working characteristics of the dual active bridge converter under the extended phase shift modulation, respectively.
The dual active bridge converter topology is shown in fig. 2. Wherein S 1:S4 represents an input side H-bridge power switching device, S 5:S8 represents an output side H-bridge power switching device, U i is an input voltage, U o is an output voltage, U 1 represents a primary side H-bridge ac side output voltage, U 2 represents a secondary side H-bridge ac side output voltage, i L represents an inductor current, n is a transformer transformation ratio, L is an energy storage inductance, and T s is a period of a switching device driving signal.
When the input-output voltage relationship satisfies U i≥nUo, according to the magnitude relationship of the two phase-shift ratios, the working modes of the dual-active bridge converter under the extended phase-shift modulation can be divided into four types:
(a)0≤D2≤D1≤1；
(b)0≤D1≤D2≤1；
(c)-1≤D1-1≤D2≤0；
(d)-1≤D2≤D1-1≤0。
By analysis and deduction, the transmission power equation of the extended phase shift modulation in different modes can be obtained:
Wherein, P i is the transmission power of the system in the working mode i, i is { a, b, c, d }; u i is input voltage, U o is output voltage, n is transformer transformation ratio, L is energy storage inductance, T s is period of driving signals of switching devices, D 1 is internal shift phase of primary side H bridge, namely phase difference between driving signals of a first primary side power switching device and a fourth primary side power switching device or phase difference between driving signals of a second primary side power switching device and a third primary side power switching device; d 2 is the phase difference between the first primary power switching device and the fifth primary power switching device as compared to the outward shift of the primary and secondary H-bridges.
Next, the basic principle of eliminating the current bias in the start-up phase will be described. Under the single phase shift modulation strategy, the duty ratio of the driving signals of the four switching tubes of the primary side H bridge of the converter is adjusted to be 0.25 in the first switching period and is shifted back by 1/4 period, as shown in fig. 3. The ac side output voltage and inductor current are shown in fig. 5. The inductance current is
Under the strategy of expanding phase shift modulation, the duty ratio of a driving signal of a switch of a primary side H bridge S 3、S4 of a converter is reducedAnd correspondingly moved backward as shown in fig. 4. The ac side output voltage and inductor current are shown in fig. 6. Wherein/>To change the intra-frame phase of the primary H-bridge after the drive signal,
From the above analysis, the control objective of limiting inductor current stress and achieving fast start-up can be translated into an optimization problem: i.e. selecting an optimal set of phase shift ratiosThe transmission power of the system is maximized given the current stress constraints are satisfied. In this optimization problem, the optimization objective is output power, given current stress and boundary conditions of the operation mode as constraints. For ease of solution, it is expressed as a standard form of KKT condition, min-P EPS(D1,D2
s.t.iLmax(D1,D2)≤Iset,Bj(D1,D2)≤0,j＝1,…,q,
Wherein, P EPS is the transmission power of the system under the extended phase shift modulation, I set is the constraint value of given current, B j(D1,D2) is the boundary condition of the working mode, and q is the constraint number. Due to the inequality constraints, the KKT condition may describe:
Wherein L is Lagrangian, and mu j is KKT multiplier. By solving, the power direction and the inductance current peak value in each operation mode of the spread phase-shift modulation as shown in table 1 and the local optimum solution of the spread phase-shift modulation in each mode as shown in table 2 can be obtained. Wherein k is U i/nUo,IN＝nUoTs/4L. And finally obtaining the required optimal phase shift ratio parameters by comparing the local optimal solutions.
TABLE 1 spread phase-shift modulation in power direction and peak inductor current for each mode
TABLE 2 local optimum solutions for extended phase-shift modulation in KKT conditions for each mode
Thus, the step of determining the optimal shift phase of the start-up phase is:
(1) Using the correlation conclusion of mode a in table 1, determining the peak inductor current when the transmission power is maximum (D 1＝0,D2 =0.5) under the unconstrained condition;
(2) The maximum allowable inductance current I set in the starting stage is determined according to the requirements of safe operation, the requirements of the cooling performance of the device and the like. If the allowable current is greater than the peak current value required in (1), then Skipping (3) and (4); otherwise, go to (3).
(3) Substituting I set into the table 2, obtaining a local optimal solution of the phase shift ratio in each working mode, and judging whether the obtained local optimal solution meets the constraint condition of the mode according to the mode division basis in the table 1.
(4) Substituting the optimal solution combination meeting the constraint condition into transmission power equations in different modes, and judging a global optimal solution for maximizing transmission powerAnd/>
The embodiment provides a non-current bias quick start control strategy based on expansion phase shift modulation; and adjusting the switching signal in the first starting period to eliminate the current bias easily generated in the starting stage. And then comprehensively analyzing the running states of the working modes of the extended phase-shifting modulation, and obtaining the optimal phase-shifting ratio under the constraint of given current stress by utilizing the KKT condition, so that the inductance current of the converter is always in the range of maintaining the allowable output current in the whole starting process, and the output power is maximized. Compared with the traditional two-stage starting control, the method has no complex parameter adjusting process and has obvious starting speed improving effect.
Example two
The second embodiment of the disclosure introduces a current-free bias magnetic quick start control system based on extended phase shift modulation.
A current-free bias fast start control system based on spread phase shift modulation as shown in fig. 7, comprising:
an adjustment module configured to adjust a switching signal in a first period when the dual active bridge inverter drive signal is enabled, eliminating a current bias generated during the enabling phase;
The analysis module is configured to analyze transmission power equations of the double-active-bridge converter under different working modes under the extended phase-shifting modulation according to the magnitude relation between the internal shift ratio of the primary side H bridge and the external phase shift ratio of the primary side H bridge and the secondary side H bridge of the double-active-bridge converter;
a calculation module configured to calculate an optimal shift phase under a preset current stress constraint based on the obtained transmission power equation, resulting in an optimal shift phase for a start-up phase;
a control module configured to control a current-free bias fast start of the dual active bridge converter by the resulting optimal shift ratio.
The detailed steps are the same as those of the method for controlling the rapid start of no-current bias based on the extended phase shift modulation provided in the first embodiment, and will not be described herein.
Example III
A third embodiment of the present disclosure provides a computer-readable storage medium.
A computer readable storage medium having stored thereon a program which when executed by a processor performs the steps in a method for extended phase shift modulation based current free bias fast start control according to one embodiment of the present disclosure.
The detailed steps are the same as those of the method for controlling the rapid start of no-current bias based on the extended phase shift modulation provided in the first embodiment, and will not be described herein.
Example IV
The fourth embodiment of the disclosure provides an electronic device.
An electronic device comprising a memory, a processor and a program stored on the memory and executable on the processor, wherein the processor implements the steps in a method for a current bias free fast start control based on spread phase shift modulation according to the first embodiment of the present disclosure when executing the program.
The detailed steps are the same as those of the method for controlling the rapid start of no-current bias based on the extended phase shift modulation provided in the first embodiment, and will not be described herein.
The foregoing description of the preferred embodiments of the present disclosure is provided only and not intended to limit the disclosure so that various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
While the specific embodiments of the present disclosure have been described above with reference to the drawings, it should be understood that the present disclosure is not limited to the embodiments, and that various modifications and changes can be made by one skilled in the art without inventive effort on the basis of the technical solutions of the present disclosure while remaining within the scope of the present disclosure.

Claims (5)

1. A current-free bias magnetic quick start control method based on extended phase shift modulation is characterized by comprising the following steps:
adjusting a switching signal in a first period when a driving signal of the double-active-bridge converter is started, and eliminating current bias generated in a starting stage;
according to the magnitude relation between the internal shift ratio of the primary side H bridge of the double-active-bridge converter and the external shift ratio of the primary side H bridge and the secondary side H bridge, analyzing the transmission power equation of the double-active-bridge converter under different working modes under the expansion phase shift modulation;
Based on the obtained transmission power equation, calculating the optimal shift phase under the constraint of preset current stress to obtain the optimal shift phase in the starting stage;
controlling the non-current bias magnetic quick start of the double-active bridge converter according to the obtained optimal shift;
The double-active-bridge converter comprises two H bridges, two voltage stabilizing filter capacitors, a high-frequency transformer and an auxiliary inductor, wherein the two H bridges are formed by 8 power switching devices, each H bridge comprises 4 power switching devices, the H bridge with the auxiliary inductor is the primary side of the double-active-bridge converter, the other H bridge is the secondary side of the double-active-bridge converter, the 4 power switching devices on the primary side of the double-active-bridge converter are started to operate at a duty ratio other than 0.5, the 4 power switching devices on the secondary side of the double-active-bridge converter are started to operate at a duty ratio of 0.5, the primary side of the double-active-bridge converter comprises a first primary side power switching device, a second primary side power switching device, a third primary side power switching device and a fourth primary side power switching device, and an inward shift phase angle is additionally arranged between the first primary side power switching device and the fourth primary side power switching device;
the operation modes of the double active converter include: (a) D 2≤D1≤1、(b)0≤D1≤D2≤1、(c)-1≤D1-1≤D2 is more than or equal to 0 and less than or equal to 0, and (D) -1 is more than or equal to D 2≤D1 -1 is more than or equal to 0; wherein D 1 is the internal shift ratio of the primary H-bridge, i.e., the phase difference between the driving signals of the first primary power switching device and the fourth primary power switching device or the phase difference between the driving signals of the second primary power switching device and the third primary power switching device; d 2 is the outward shift of the primary and secondary H-bridges, i.e. the phase difference between the first primary power switching device and the fifth primary power switching device;
the transmission power equation of the double-active converter under the expansion phase-shift modulation in different working modes is as follows:
Wherein, P i is the transmission power of the system in the working mode i, i is { a, b, c, d }; u i is input voltage, U o is output voltage, n is transformer transformation ratio, L is energy storage inductance, and T s is period of a driving signal of a switching device;
Under a single phase shift modulation strategy, the duty ratio of driving signals of a first primary power switching device and a fourth primary power switching device of a primary H-bridge of the converter is adjusted to be 0.25 in a first switching period, and the driving signals are shifted backwards by 1/4 period; the maximum inductance current I max is Wherein U i is input voltage, L is energy storage inductance, and T s is period of a driving signal of the switching device;
Reducing the duty ratio of driving signals of a third primary side power switch device and a fourth primary side power switch device of an original side H bridge of a converter under the expanding phase shift modulation strategy And correspondingly moves backwards, and the internal shift phase/>, of the primary side H bridge after the driving signal is changedFor/>The maximum inductance current I max isWherein D 1 is the internal shift of the primary side H bridge, U i is the input voltage, U 1 represents the output voltage of the primary side H bridge on the alternating side, L is the energy storage inductance, and T s is the period of the driving signal of the switching device;
the process of obtaining the optimal phase shift phase of the starting phase is as follows:
the control objective of limiting inductor current stress and achieving fast start-up can be translated into an optimization problem: i.e. selecting an optimal set of phase shift ratios Maximizing the transmission power of the system in the event that a given current stress constraint is satisfied; in the optimization problem, the optimization target is output power, and the boundary conditions of given current stress and an operating mode are constraint conditions; for ease of solution, it is expressed as a standard form of KKT condition, min-P EPS(D1,D2
s.t.iLmax(D1,D2)≤Iset,Bj(D1,D2)≤0,j＝1,…,q,
Wherein P EPS is the transmission power of the system under the extended phase-shift modulation, I set is the constraint value of a given current, B j(D1,D2) is the boundary condition of the working mode, and q is the constraint number; due to the inequality constraints, the KKT condition may describe:
Wherein L is Lagrangian, mu j is KKT multiplier; solving to obtain the power direction and inductance current peak value of the extended phase-shift modulation in each working mode shown in table 1 and the local optimal solution of the extended phase-shift modulation in each mode shown in table 2; wherein k is U i/nUo,IN＝nUoTs/4L; comparing the local optimal solutions to obtain the required optimal phase shift ratio parameters;
TABLE 1 spread phase-shift modulation in power direction and peak inductor current for each mode
TABLE 2 local optimum solutions for extended phase-shift modulation in KKT conditions for each mode
2. The method for controlling current-free bias magnetic fast start-up based on extended phase shift modulation as set forth in claim 1, wherein the process of obtaining the optimal phase shift of the start-up phase is:
determining an inductance current peak value when the transmission power is maximum under the unconstrained condition;
Determining the maximum allowable inductance current in the starting stage according to the requirements of safe operation, the cooling performance of the device and the like; if the maximum allowable current is larger than the obtained inductance current peak value, directly outputting the optimal shift phase, otherwise, entering the next step;
Based on the KKT condition and the determined maximum allowable inductance current, obtaining a local optimal solution of the phase shift ratio in each working mode, and judging whether the obtained local optimal solution meets the constraint condition of the mode;
Substituting the optimal solution combination meeting the constraint condition into transmission power equations in different modes, and judging a global optimal solution for maximizing transmission power.
3. A current-free bias fast start control system based on spread phase shift modulation, comprising:
an adjustment module configured to adjust a switching signal in a first period when the dual active bridge inverter drive signal is enabled, eliminating a current bias generated during the enabling phase;
The analysis module is configured to analyze transmission power equations of the double-active-bridge converter under different working modes under the extended phase-shifting modulation according to the magnitude relation between the internal shift ratio of the primary side H bridge and the external phase shift ratio of the primary side H bridge and the secondary side H bridge of the double-active-bridge converter;
a calculation module configured to calculate an optimal shift phase under a preset current stress constraint based on the obtained transmission power equation, resulting in an optimal shift phase for a start-up phase;
a control module configured to control a currentless bias fast start of the dual active bridge converter by the resulting optimal shift phase;
The double-active-bridge converter comprises two H bridges, two voltage stabilizing filter capacitors, a high-frequency transformer and an auxiliary inductor, wherein the two H bridges are formed by 8 power switching devices, each H bridge comprises 4 power switching devices, the H bridge with the auxiliary inductor is the primary side of the double-active-bridge converter, the other H bridge is the secondary side of the double-active-bridge converter, the 4 power switching devices on the primary side of the double-active-bridge converter are started to operate at a duty ratio other than 0.5, the 4 power switching devices on the secondary side of the double-active-bridge converter are started to operate at a duty ratio of 0.5, the primary side of the double-active-bridge converter comprises a first primary side power switching device, a second primary side power switching device, a third primary side power switching device and a fourth primary side power switching device, and an inward shift phase angle is additionally arranged between the first primary side power switching device and the fourth primary side power switching device;
the operation modes of the double active converter include: (a) D 2≤D1≤1、(b)0≤D1≤D2≤1、(c)-1≤D1-1≤D2 is more than or equal to 0 and less than or equal to 0, and (D) -1 is more than or equal to D 2≤D1 -1 is more than or equal to 0; wherein D 1 is the internal shift ratio of the primary H-bridge, i.e., the phase difference between the driving signals of the first primary power switching device and the fourth primary power switching device or the phase difference between the driving signals of the second primary power switching device and the third primary power switching device; d 2 is the outward shift of the primary and secondary H-bridges, i.e. the phase difference between the first primary power switching device and the fifth primary power switching device;
the transmission power equation of the double-active converter under the expansion phase-shift modulation in different working modes is as follows:
Wherein, P i is the transmission power of the system in the working mode i, i is { a, b, c, d }; u i is input voltage, U o is output voltage, n is transformer transformation ratio, L is energy storage inductance, and T s is period of a driving signal of a switching device;
Under a single phase shift modulation strategy, the duty ratio of driving signals of a first primary power switching device and a fourth primary power switching device of a primary H-bridge of the converter is adjusted to be 0.25 in a first switching period, and the driving signals are shifted backwards by 1/4 period; the maximum inductance current I max is Wherein U i is input voltage, L is energy storage inductance, and T s is period of a driving signal of the switching device;
Reducing the duty ratio of driving signals of a third primary side power switch device and a fourth primary side power switch device of an original side H bridge of a converter under the expanding phase shift modulation strategy And correspondingly moves backwards, and the internal shift phase/>, of the primary side H bridge after the driving signal is changedFor/>The maximum inductance current I max isWherein D 1 is the internal shift of the primary side H bridge, U i is the input voltage, U 1 represents the output voltage of the primary side H bridge on the alternating side, L is the energy storage inductance, and T s is the period of the driving signal of the switching device;
the process of obtaining the optimal phase shift phase of the starting phase is as follows:
the control objective of limiting inductor current stress and achieving fast start-up can be translated into an optimization problem: i.e. selecting an optimal set of phase shift ratios Maximizing the transmission power of the system in the event that a given current stress constraint is satisfied; in the optimization problem, the optimization target is output power, and the boundary conditions of given current stress and an operating mode are constraint conditions; for ease of solution, it is expressed as a standard form of KKT condition, min-P EPS(D1,D2
s.t.iL max(D1,D2)≤Iset,Bj(D1,D2)≤0,j＝1,…,q,
Wherein P EPS is the transmission power of the system under the extended phase-shift modulation, I set is the constraint value of a given current, B j(D1,D2) is the boundary condition of the working mode, and q is the constraint number; due to the inequality constraints, the KKT condition may describe:
Wherein L is Lagrangian, mu j is KKT multiplier; solving to obtain the power direction and inductance current peak value of the extended phase-shift modulation in each working mode shown in table 1 and the local optimal solution of the extended phase-shift modulation in each mode shown in table 2; wherein k is U i/nUo,IN＝nUoTs/4L; comparing the local optimal solutions to obtain the required optimal phase shift ratio parameters;
TABLE 3 spread phase-shift modulation in power direction and peak inductor current for each mode
Table 4 spread phase-shift modulation local optimum solutions for each mode under KKT conditions
4. A computer-readable storage medium, on which a program is stored, which program, when being executed by a processor, implements the steps of the method for controlling a fast start-up of a current-free bias based on spread phase shift modulation as claimed in any one of claims 1-2.
5. An electronic device comprising a memory, a processor and a program stored on the memory and executable on the processor, wherein the processor performs the steps in the extended phase shift modulation based no-current bias fast start control method of any one of claims 1-2.
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