CN115459595A - Interleaved parallel direct current conversion control system and method - Google Patents

Interleaved parallel direct current conversion control system and method Download PDF

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CN115459595A
CN115459595A CN202211284659.5A CN202211284659A CN115459595A CN 115459595 A CN115459595 A CN 115459595A CN 202211284659 A CN202211284659 A CN 202211284659A CN 115459595 A CN115459595 A CN 115459595A
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voltage
current
interleaved parallel
direct current
signal
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郭磊
周广旭
宋宁冉
朱孟美
慕永云
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Institute of Automation Shandong Academy of Sciences
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Institute of Automation Shandong Academy of Sciences
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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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a 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

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  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a staggered parallel direct current conversion control system, a method, electronic equipment and a computer readable storage medium, belonging to the technical field of direct current converter control; the device comprises a voltage control module and a current control module; the voltage control module is used for receiving a voltage signal output by the interleaved parallel boost direct current converter and converting the voltage signal into an average current given signal; the voltage control module comprises a third-order extended state observer, and the third-order extended state observer is used for estimating a disturbance state caused by parameter uncertainty and input voltage change; the current control module is used for receiving a current signal output by the interleaved parallel boost direct current converter and a current given signal output by the voltage control module and outputting a PWM wave signal to control the operation of the interleaved parallel boost direct current converter. The robustness of the controller is improved, and the dynamic performance of voltage control is improved; the problems of long dynamic voltage regulation time and improved output voltage performance in the prior art are solved.

Description

Interleaved parallel direct current conversion control system and method
Technical Field
The present application relates to the field of dc converter control technologies, and in particular, to a system and a method for controlling interleaved parallel dc converters.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The Interleaved parallel DC boost converter (Interleaved parallel DC-DC boost converter) has the advantages of small volume, simple structure, small current fluctuation, large power density and the like, is widely applied as an important electric energy conversion device in a hydrogen fuel automobile structure, and can boost and stabilize the electric energy of low voltage and large current generated by a hydrogen fuel cell to realize stable power supply of a motor driver. The stability of the output voltage is the primary objective of the dc converter, however, the inductance and resistance of the converter are susceptible to drift in the operation process of the equipment due to the operation time and the operation temperature, which affects the dynamic performance of the voltage control; in addition, due to the nonlinear voltage-current characteristics of the hydrogen fuel cell, the output voltage decreases as the current increases, causing periodic fluctuations in the cell voltage, which further causes periodic fluctuations in the output voltage of the dc converter, resulting in a decrease in the voltage output stability. Therefore, it is necessary to design a voltage controller with strong robustness, so as to improve the stability and dynamic performance of voltage control.
In the prior art, there are two main types of control methods for interleaved parallel dc boost converters, the first type is to design a voltage controller based on a PI control method, the method is simple in design and wide in application range, however, the method is limited by the design bandwidth, when the inductance and resistance values change, the voltage control performance is reduced, and the dynamic performance needs to be further improved; the second type is a controller design method based on a state observer, which estimates disturbance terms caused by uncertain parameters and external interference through the state observer and compensates the controller to improve the control performance of voltage, however, under the condition of continuous change of input voltage, the existing state observation method has insufficient estimation capability on the periodically fluctuating state, and cannot effectively inhibit the influence of input voltage fluctuation, so that the output voltage has fluctuation and the voltage control stability is reduced.
In summary, certain progress has been made at home and abroad on the control method of the interleaved parallel dc boost converter, but certain disadvantages still exist:
firstly, when the load suddenly changes or the voltage is given to change, the dynamic voltage regulation time is longer;
secondly, under the condition that the input voltage continuously changes, the output voltage fluctuates, the control robustness needs to be enhanced, and an improved voltage controller needs to be designed aiming at the conditions that the parameters are uncertain and the input voltage changes, so that the voltage output performance is improved.
Disclosure of Invention
To overcome the deficiencies of the prior art, the present application provides an interleaved parallel dc conversion control system, method, electronic device and computer readable storage medium.
In a first aspect, the present application provides an interleaved parallel dc conversion control system;
a staggered parallel direct current conversion control system comprises a voltage control module and a current control module;
the voltage control module is used for receiving a voltage signal output by the interleaved parallel boost direct-current converter and converting the voltage signal into an average current given signal; the voltage control module comprises a third-order extended state observer, and the third-order extended state observer is used for estimating a disturbance state caused by parameter uncertainty and input voltage change;
the current control module is used for receiving a current signal output by the interleaved parallel boost direct current converter and a current given signal output by the voltage control module and outputting a PWM wave signal to control the operation of the interleaved parallel boost direct current converter.
In a second aspect, the present application provides a method for controlling interleaved parallel dc conversion;
an interleaved parallel direct current conversion control method comprises the following steps:
acquiring a voltage signal and a current signal of the interleaved parallel boost direct current converter, and constructing a mathematical model of the interleaved parallel boost direct current converter according to the voltage signal and a circuit structure of the interleaved parallel boost direct current converter;
constructing a staggered parallel direct current conversion control system according to a mathematical model of a staggered parallel boost direct current converter;
inputting a voltage signal and a current signal of the interleaved parallel boost direct-current converter into an interleaved parallel direct-current conversion control system to obtain a PWM wave signal for controlling the operation of the interleaved parallel boost direct-current converter;
and outputting the PWM signal to the interleaved parallel boost direct current converter to control the operation of the interleaved parallel boost direct current converter.
In a third aspect, the present application provides an electronic device;
an electronic device comprises a memory, a processor and computer instructions stored in the memory and executed on the processor, wherein the computer instructions are executed by the processor to complete the steps of the interleaved parallel direct current conversion control method.
In a fourth aspect, the present application provides a computer-readable storage medium;
a computer readable storage medium for storing computer instructions, which when executed by a processor, perform the steps of the interleaved parallel dc conversion control method.
Compared with the prior art, the beneficial effects of this application are:
1. according to the three-order extended state observer, a new extended state is added to estimate the derivative of an interference item, and the estimated value of a system interference item is obtained, so that the estimation capability of the periodic fluctuation state in the interference item is improved, and the problem that the estimation performance of the conventional state observation method for the periodic fluctuation state is insufficient can be solved;
2. according to the method and the device, the state estimation value of the three-order extended state observer is introduced, the average current given value is compensated, the influence of the periodic fluctuation of the input voltage can be better restrained, the control stability of the output voltage is improved, the dependence on the parameters of the accurate direct current converter is reduced, the robustness of the controller is improved, and the dynamic performance of voltage control is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application, and the description of the exemplary embodiments and illustrations of the application are intended to explain the application and are not intended to limit the application.
Fig. 1 is a schematic diagram of a system architecture of an interleaved parallel dc conversion control system according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit diagram of an interleaved parallel boost dc converter according to an embodiment of the present disclosure;
fig. 3 is a simulation diagram comparing effects of control performed by the existing method and the method provided by the present application under the condition of input voltage fluctuation and sudden change of the dc load according to the embodiment of the present application;
fig. 4 is a simulation comparison diagram of control effects of the control performed by the existing control method and the method provided in the present application under the condition of input voltage fluctuation and given voltage abrupt change provided in the embodiment of the present application;
fig. 5 is a flowchart illustrating an interleaved parallel dc conversion control method provided in the present application.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure herein. 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 application 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 according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that the terms "comprises" and "comprising", and any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiments and features of the embodiments of the invention may be combined with each other without conflict.
Example one
In the control method for the interleaved parallel direct current boost converter in the prior art, the estimation capability of the periodic fluctuation state is insufficient, the influence of input voltage fluctuation cannot be effectively inhibited, so that the output voltage fluctuates, and the voltage control stability is reduced; therefore, the present embodiment provides an interleaved parallel dc conversion control system.
With reference to fig. 1-2, the interleaved parallel dc conversion control system provided in this embodiment includes a voltage control module and a current control module; the voltage control module is used for receiving a voltage signal output by the interleaved parallel boost direct current converter and converting the voltage signal into an average current given signal; the current control module is used for receiving a current signal output by the interleaved parallel boost direct current converter and a current given signal output by the voltage control module and outputting a PWM wave signal to control the operation of the interleaved parallel boost direct current converter; the output end of the interleaved parallel boost direct current converter is connected with the input end of the voltage control module, and the output end of the voltage control module is connected with the first input end of the current control module; the output end of the current control module is connected with the input end of the interleaved parallel boost direct current converter; and the output end of the interleaved parallel boost direct current converter is connected with the second input end of the current control module.
The voltage control module comprises a three-order extended state observer, an improved control law operation unit, a voltage setting unit, a voltage input unit, a first comparison unit and a switch control operation unit; the output end of the voltage given unit is connected with the first input end of the first comparison unit, the first output end of the voltage input unit is connected with the second input end of the first comparison unit, the output end of the first comparison unit is connected with the input end of the switch control operation unit, and the output end of the switch control operation unit is connected with the first input end of the improved control law operation unit; the second output end of the voltage input unit is connected with the first input end of the third-order extended state observer, and the output end of the third-order extended state observer is connected with the second input end of the improved control law operation unit; and the second input end of the third-order extended state observer is connected with the first output end of the improved control law operation unit.
The voltage input unit is used for receiving the output voltage of the interleaved parallel boost direct current converter and outputting the actual output voltage value of the interleaved parallel boost direct current converter; the voltage setting unit is used for outputting a reference voltage value of the direct-current voltage; the first comparison unit is used for receiving the reference voltage value and the actual output voltage value and outputting a difference value between the actual output voltage value and the reference voltage value; the switch control operation unit is used for receiving the difference value and outputting a switch control signal; the improved control law arithmetic unit is used for receiving a state estimation value of a system interference term and a switch control signal output by the three-order extended state observer and outputting a current given signal containing voltage fluctuation compensation quantity; the third-order extended state observer is used for receiving an actual output voltage value of the interleaved parallel boost direct-current converter and an average current given signal containing voltage fluctuation compensation quantity and outputting a state estimation value of a system interference item.
Specifically, the input signal of the voltage control module is a voltage signal V of the interleaved parallel boost direct current converter o Finally obtaining the average current given signal I ref As an input reference signal for the current control module;
the output of the voltage setting unit is a reference voltage value of the direct current voltage
Figure BDA0003894239510000061
The input signal of the voltage input unit is the output voltage of the interleaved parallel boost DC converter, and the output is the actual output voltage value V of the interleaved parallel boost DC converter o ；
The input signal of the first comparison unit is a reference voltage value V output by the voltage setting unit o * Actual output voltage value V output by the sum voltage input unit o By the following formula:
Figure BDA0003894239510000062
an output signal s of the first comparing unit is obtained.
The input signal of the third-order extended state observer is the actual output voltage value V of the voltage input unit o And improving the output signal I of the control law arithmetic unit ref The designed third-order dilation observer is represented by the following equation:
Figure BDA0003894239510000063
wherein, the state z 1 、z 2 、z 3 Respectively as actual output voltage value V 0 A system interference term f and a system interference derivative term
Figure BDA0003894239510000064
State estimation value of (a), b 0 、β 1 、β 2 And beta 3 Are the coefficients of a 3 rd order extended state observer. Observer parameter beta 1 、β 2 And beta 3 For adjusting the estimation speed, the larger the parameter is, the faster the estimation speed is, and the too fast estimation speed can cause the system to be unstable, so that the proper observer parameter can be selected according to the parameter characteristic and the actual requirement.
Different from the prior method, the three-order extended state observer is adopted to realize the observation of the system state, and the extended state z 3 The method realizes observation of the derivative of the system interference term, and improves the estimation performance of the observer on the periodic fluctuation state under the condition of continuous change of the input voltage of the interleaved direct current converter.
System interference term f and coefficient b 0 Is expressed as
Figure BDA0003894239510000071
Obtaining the state estimation value z of the system interference item 2 。
The input signal of the switch control operation unit is the output signal s of the first comparison unit, and is obtained by the following formula
u s ＝α∫sgn(s)dt+β|s| 0.5 sgn(s)
The alpha and beta are parameters of a switch control operation unit and are used for adjusting the rapidity of voltage control, the larger the parameter is, the faster the adjustment speed is, and appropriate parameters can be selected according to actual requirements;
obtain a switch control signal u s 。
The input signal of the control law operation unit is improved to be the state estimation value z of the third-order extended state observer 2 And a switch control signal u of the switch control arithmetic unit s By the formula
Figure BDA0003894239510000072
Wherein z is 2 Is a state estimate of a third order extended state observer, u s For switching control signals, I ref The signal is given for the average current containing the amount of voltage ripple compensation.
Obtaining a current given signal I containing voltage fluctuation compensation quantity by the formula ref 。
The difference between the improved control law and the existing method is that the estimated state z of a third-order extended state observer is introduced 2 The current setting is compensated, so that the influence of periodic input voltage fluctuation can be obviously reduced, and the control stability of the output voltage is improved.
The current control module comprises a comparison unit, a PI control unit, a current input unit and a PWM wave generation unit;
for example, when the interleaved parallel dc converter control system described in this embodiment is applied to control of a three-bridge arm interleaved parallel dc converter, the PI control unit includes a first PI control unit, a second PI control unit, and a third PI control unit, and the comparison unit includes a second comparison unit, a third comparison unit, and a fourth comparison unit.
The output end of the interleaved parallel boost direct current converter is connected with the input end of the current input unit, the first output end of the current input unit is connected with the first input end of the second comparison unit, the second output end of the improved control law operation unit is connected with the second input end of the second comparison unit, the output end of the second comparison unit is connected with the input end of the first PI control unit, and the output end of the first PI control unit is connected with the first input end of the PWM wave generation unit; the second output end of the current input unit is connected with the first input end of the third comparison unit, the third output end of the improved control law operation unit is connected with the second input end of the third comparison unit, the output end of the third comparison unit is connected with the input end of the second PI control unit, and the output end of the second PI control unit is connected with the second input end of the PWM wave generation unit; the third output end of the current input unit is connected with the first input end of the fourth comparison unit, the fourth output end of the improved control law operation unit is connected with the second input end of the fourth comparison unit, the output end of the fourth comparison unit is connected with the input end of the third PI control unit, and the output end of the third PI control unit is connected with the third input end of the PWM wave generation unit; the output end of the PWM wave generating unit is connected with the input end of the interleaved parallel boost direct current converter.
The current input unit is used for receiving a current signal of the interleaved parallel boost direct current converter and outputting an actual current value; the comparison unit is used for receiving the current given signal and the actual current value and outputting a current tracking error; the PI control unit is used for receiving the current tracking error and outputting a duty ratio; and the PWM wave generating unit is used for receiving the duty ratio and converting the duty ratio into a PWM wave signal to be output so as to control the operation of the interleaved parallel boost direct current converter.
Specifically, the input signal of the current control module is a current given signal I with voltage fluctuation compensation quantity output by the voltage control module ref And interleaving the actual current signals of the boost direct-current converters in parallel to finally obtain PWM wave signals for controlling the operation of the direct-current converters.
The input signal of the current input unit is the current of the interleaved boost direct current converter, and the output is the actual current value i L1 、i L2 、i L3 。
The input signal of the second comparing unit is electricCurrent given signal I output by voltage control module ref And the actual current value i output by the current input unit L1 By the following formula:
e 1 ＝I ref -i L1
obtaining the current tracking error e of the bridge arm 1 1 。
The input signal of the first PI control unit is the current tracking error e output by the second comparison unit 1 By the following formula:
Figure BDA0003894239510000091
k p1 、k i1 proportional and integral coefficients of the first PI control unit;
obtaining the duty ratio given by the bridge arm 1
Figure BDA0003894239510000092
The input signal of the third comparison unit is a current given signal I output by the voltage control module ref And the actual current value i output by the current input unit L2 By the following formula:
e 2 ＝I ref -i L2
obtaining the current tracking error e of the bridge arm 2 2 .
The input signal of the second PI control unit is the current tracking error e output by the third comparison unit 2 By the following formula:
Figure BDA0003894239510000093
k p2 、k i2 proportional and integral coefficients of the second PI control unit;
obtaining the given duty ratio of the bridge arm 2
Figure BDA0003894239510000094
Input of the fourth comparing unitThe signal is a current given signal I output by the voltage control module ref And the actual current value i output by the current input unit L3 By the following formula:
e 3 ＝I ref -i L3
obtaining the current tracking error e of the bridge arm 3 3 .
The input signal of the third PI control unit is the current tracking error e output by the fourth comparison unit 3 By the following formula:
Figure BDA0003894239510000101
k p3 、k i3 proportional and integral coefficients of the third PI control unit;
obtaining the given duty ratio of the bridge arm 3
Figure BDA0003894239510000102
The input signal of the PWM wave generation unit gives the duty ratio output by the first PI control unit
Figure BDA0003894239510000103
Duty ratio given of output of the second PI control unit
Figure BDA0003894239510000104
And duty ratio setting of the third PI control unit output
Figure BDA0003894239510000105
And converting the voltage into a waveform of a PWM wave and outputting the waveform.
Example two
With reference to fig. 3 to 5, this embodiment discloses an interleaved parallel dc conversion control method, including:
s1, acquiring a voltage signal and a current signal of an interleaved parallel boost direct current converter, and constructing a mathematical model of the interleaved parallel boost direct current converter according to the voltage signal and a circuit structure of the interleaved parallel boost direct current converter; the mathematical model for constructing the staggered parallel boost direct current converter is as follows:
Figure BDA0003894239510000106
wherein, V o For the output voltage, V, of interleaved boost DC converters in Is the input voltage of the interleaved parallel boost DC converter, C is the filter capacitor, u k Is the duty cycle of the switching tube, i LK Is k phase bridge arm current, R L Is a load resistance of the DC converter, L k Is the inductance of the k-phase bridge arm, r k Is the equivalent resistance of the k-phase bridge arm inductance.
S2, constructing a staggered parallel direct current conversion control system according to a mathematical model of a staggered parallel boosting direct current converter; the interleaved parallel direct current conversion control system comprises a voltage control module and a current control module, wherein the voltage control module comprises a three-order extended state observer, an improved control law operation unit, a voltage given unit, a voltage input unit, a first comparison unit and a switch control operation unit, and the current control module comprises a comparison unit, a PI control unit, a current input unit and a PWM wave generation unit; the specific construction method is the same as that described in the first embodiment, and is not described again.
S3, inputting a voltage signal and a current signal of the interleaved parallel boost direct-current converter into an interleaved parallel direct-current conversion control system to obtain a PWM wave signal for controlling the operation of the interleaved parallel boost direct-current converter;
and S4, outputting the PWM signal to the interleaved parallel boost direct current converter to control the operation of the interleaved parallel boost direct current converter.
To further illustrate the technical effects of the present embodiment, a simulation is performed by taking a three-bridge arm interleaved parallel boost dc converter as an example.
The parameter of the mathematical model of the interleaved parallel boost direct current converter is L 1 ＝L 2 ＝L 3 ＝2.5mH；r 1 ＝r 2 ＝r 3 =20m Ω; c =100uF; the controller parameters used in the simulation were respectively: α =0.03, β =0.0025,b 0 ＝6600，β 1 ＝3ω 0 ，
Figure BDA0003894239510000111
ω 0 ＝2500，k p1 ＝k p2 ＝k p3 ＝0.03，k i1 ＝k i2 ＝k i3 =0.0025, voltage given
Figure BDA0003894239510000112
The input voltage average is 110V.
The simulation results in the case of voltage fluctuations with an input voltage superimposed frequency of 10Hz and an amplitude of 10V are shown in fig. 3 and 4. In fig. 3, when the load suddenly changes from 25 Ω to 12.5 Ω at 0.5s, the output voltage observed by the existing PI voltage control method fluctuates significantly, and the voltage recovery time after the load suddenly changes is longer. Fig. 4 is a simulation waveform when the voltage is suddenly changed from 400V to 600V, and the voltage output by the interleaved parallel direct current control method is constant, the voltage rise time is shorter, and the voltage control stability is better.
According to simulation results, the interleaved parallel direct current control method can ensure that more stable voltage is output under the condition of input voltage fluctuation, the dynamic recovery capability of the voltage is better, and the stability of system operation and the voltage output performance are improved.
The interleaved parallel direct-current control method described in this embodiment is not limited to a three-bridge-arm direct-current converter, and can be extended to a two-bridge-arm and multi-bridge-arm direct-current converter.
EXAMPLE III
The third embodiment of the present invention provides an electronic device, which includes a memory, a processor, and a computer instruction stored in the memory and running on the processor, where when the computer instruction is run by the processor, the steps of the interleaved parallel dc conversion control method are completed.
Example four
A fourth embodiment of the present invention provides a computer-readable storage medium, configured to store a computer instruction, where the computer instruction, when executed by a processor, completes the steps of the interleaved parallel dc conversion control method.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the foregoing embodiments, the descriptions of the embodiments have different emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A staggered parallel direct current conversion control system is characterized by comprising a voltage control module and a current control module;
the voltage control module is used for receiving a voltage signal output by the interleaved parallel boost direct-current converter and converting the voltage signal into an average current given signal; the voltage control module comprises a third-order extended state observer, and the third-order extended state observer is used for estimating the parameter uncertainty and the disturbance state introduced by the input voltage change;
the current control module is used for receiving a current signal output by the interleaved parallel boost direct current converter and a current given signal output by the voltage control module and outputting a PWM wave signal to control the operation of the interleaved parallel boost direct current converter.
2. The interleaved parallel dc conversion control system according to claim 1, wherein said voltage control module further comprises an improved control law arithmetic unit, said improved control law arithmetic unit is configured to receive an estimated state output by said third order extended state observer and output a current setting signal containing a voltage fluctuation compensation amount.
3. The interleaved parallel dc conversion control system according to claim 1, wherein said voltage control module further comprises a voltage setting unit, a voltage input unit, a first comparison unit, a switch control operation unit, and an improved control law operation unit;
the voltage input unit is used for receiving the output voltage of the interleaved parallel boost direct current converter and outputting the actual output voltage value of the interleaved parallel boost direct current converter;
the voltage setting unit is used for outputting a reference voltage value of the direct-current voltage;
the first comparison unit is used for receiving the reference voltage value and the actual output voltage value and outputting a difference value between the actual output voltage value and the reference voltage value;
the switch control operation unit is used for receiving the difference value and outputting a switch control signal;
the improved control law operation unit is used for receiving a state estimation value of a system interference term and a switch control signal output by the three-order extended state observer and outputting a current given signal containing voltage fluctuation compensation quantity;
the third-order extended state observer is used for receiving an actual output voltage value of the interleaved parallel boost direct-current converter and an average current given signal containing voltage fluctuation compensation quantity and outputting a state estimation value of a system interference item.
4. The interleaved parallel dc conversion control system according to claim 1, wherein said current control module comprises a comparison unit, a PI control unit, a current input unit, and a PWM wave generation unit;
the current input unit is used for receiving a current signal of the interleaved parallel boost direct current converter and outputting an actual current value;
the comparison unit is used for receiving the current given signal and the actual current value and outputting a current tracking error;
the PI control unit is used for receiving the current tracking error and outputting a duty ratio;
and the PWM wave generating unit is used for receiving the duty ratio and converting the duty ratio into a PWM wave signal to be output so as to control the operation of the interleaved parallel boost direct current converter.
5. An interleaved parallel dc conversion control system as claimed in claim 1 wherein said third order extended state observer is represented as
Figure FDA0003894239500000021
Wherein, the state z 1 、z 2 、z 3 Are respectively actual outputVoltage value V 0 A system interference term f and a system interference derivative term
Figure FDA0003894239500000023
State estimation value of (b) 0 、β 1 、β 2 And beta 3 Are the coefficients of a 3 rd order extended state observer.
6. The interleaved parallel dc conversion control system as claimed in claim 1, wherein said modified control law arithmetic unit is represented as
Figure FDA0003894239500000022
Wherein, Z 2 Is a state estimate of a third order extended state observer, u s For switching control signals, I ref A signal is given for the average current containing a voltage ripple compensation.
7. A method for controlling interleaved parallel direct current conversion is characterized by comprising the following steps:
acquiring a voltage signal and a current signal of the interleaved parallel boost direct current converter, and constructing a mathematical model of the interleaved parallel boost direct current converter according to the voltage signal and the circuit structure of the interleaved parallel boost direct current converter;
constructing a staggered parallel direct current conversion control system according to a mathematical model of a staggered parallel boosting direct current converter;
inputting a voltage signal and a current signal of the interleaved parallel boost direct current converter into an interleaved parallel direct current conversion control system to obtain a PWM wave signal for controlling the operation of the interleaved parallel boost direct current converter;
and outputting the PWM signal to the interleaved parallel boost direct current converter to control the operation of the interleaved parallel boost direct current converter.
8. The interleaved parallel dc conversion control method of claim 7, wherein the mathematical model for constructing the interleaved parallel boost dc converter is:
Figure FDA0003894239500000031
wherein, V o For the output voltage, V, of interleaved boost DC converters in Is the input voltage of the interleaved parallel boost DC converter, C is the filter capacitor, u k For switching tube duty cycle, i LK Is k-phase bridge arm current, R L Is a load resistance of the DC converter, L k Is the inductance of the k-phase bridge arm, r k Is the equivalent resistance of the k-phase bridge arm inductance.
9. An electronic device comprising a memory and a processor and computer instructions stored on the memory and executable on the processor, the computer instructions when executed by the processor performing the steps of any of claims 7 to 8.
10. A computer readable storage medium storing computer instructions which, when executed by a processor, perform the steps of any of claims 7 to 8.
CN202211284659.5A 2022-10-17 2022-10-17 Interleaved parallel direct current conversion control system and method Pending CN115459595A (en)

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