CN112398356A - LCL resonance control method and device for switching power supply - Google Patents
LCL resonance control method and device for switching power supply Download PDFInfo
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- CN112398356A CN112398356A CN202011191780.4A CN202011191780A CN112398356A CN 112398356 A CN112398356 A CN 112398356A CN 202011191780 A CN202011191780 A CN 202011191780A CN 112398356 A CN112398356 A CN 112398356A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention provides a switch power supply LCL resonance control method and a device, wherein the method comprises the following steps: obtaining an inductive current at the input side of the LCL filter; extracting a high-frequency component in the inductive current, and determining a control quantity of the switching power supply based on the inductive current, the high-frequency component and a preset current reference value; and controlling a switching tube in the switching power supply based on the control quantity. The resonance control method and the device for the LCL of the switching power supply realize the inhibition of the resonance of the LCL of the switching power supply by sampling the inductive current, have lower sampling difficulty and sampling cost compared with the scheme of sampling the capacitive current in the prior art, and can offset the control quantity of a high-frequency part in a control loop by adding the high-frequency component of the inductive current as a feedback quantity into the calculation of the control quantity, thereby improving the control precision.
Description
Technical Field
The invention belongs to the technical field of electrical control, and particularly relates to a method and a device for controlling LCL resonance of a switching power supply.
Background
Because the LCL filter has good high frequency filtering characteristics, it is usually selected as an interface between the switching power supply and the grid, and between the switching power supply and the load, to improve the current waveform quality, but because the LCL filter is a second-order system, there is a very large resonance peak at its resonance frequency, thus seriously affecting the system stability. In order to suppress the LCL resonance in the switching power supply, the technical scheme generally adopted in the prior art is as follows: and increasing current sampling on the filter capacitor C, and performing circuit control based on the capacitor current. However, this solution has the following drawbacks:
the capacitance current sampling is difficult, the cost is high, although a scheme of estimating the capacitance current through a mathematical model exists in the prior art, the estimation precision needs to depend on the precision of the mathematical model, and the complexity of the system is increased, so that how to provide a control scheme with simple sampling and low cost while ensuring the control precision becomes a problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a method and a device for controlling the resonance of a switch power supply (LCL), which are used for reducing the sampling difficulty and the sampling cost while ensuring the control precision.
In a first aspect of the embodiments of the present invention, a method for controlling a switching power supply LCL resonance is provided, where the method is applied to a switching power supply circuit formed by connecting a switching power supply and an LCL filter, and includes:
obtaining an inductive current at the input side of the LCL filter;
extracting a high-frequency component in the inductive current, and determining a control quantity of the switching power supply based on the inductive current, the high-frequency component and a preset current reference value;
and controlling a switching tube in the switching power supply based on the control quantity.
Optionally, before obtaining the bus capacitor voltage corresponding to the switching power supply, the method for determining the preset current reference value includes:
acquiring bus capacitor voltage corresponding to a switching power supply;
and determining a preset current reference value according to the bus capacitor voltage and a preset voltage reference value.
Optionally, the determining a current reference value according to the bus capacitor voltage and a preset voltage reference value includes:
determining a voltage error value based on the bus capacitor voltage and a preset voltage reference value;
and inputting the voltage error value into a preset voltage loop controller to obtain a current reference value.
Optionally, before extracting a high-frequency component in the inductor current and determining a control quantity of the switching power supply based on the inductor current, the high-frequency component and the current reference value, a step of performing coordinate transformation on the inductor current is further included;
the step of transforming the coordinates of the inductor current comprises:
acquiring output voltage of the output side of the switching power supply, and performing phase extraction on the output voltage to obtain voltage phases of all phases of the output side of the switching power supply;
and carrying out coordinate transformation on the inductive current based on the voltage phase of each phase to obtain a d-axis current component and a q-axis current component of the inductive current in a dq coordinate system.
Optionally, the extracting the high-frequency component in the inductor current includes:
and respectively inputting the d-axis current component and the q-axis current component into a preset high-pass filter to obtain a d-axis high-frequency component and a q-axis high-frequency component of the inductive current.
Optionally, the high-frequency component includes a d-axis high-frequency component and a q-axis high-frequency component, and the control quantity of the switching power supply includes a first α -axis control quantity and a first β -axis control quantity of the switching power supply in an α β coordinate system;
the determining a control amount of the switching power supply based on the inductor current, the high frequency component, and the current reference value includes:
determining a first alpha-axis control quantity in an alpha-beta coordinate system based on the d-axis high-frequency component, the current reference value and the d-axis current component;
and determining a first beta axis control quantity under an alpha beta coordinate system based on the q axis high frequency component, a preset q axis current reference value and the q axis current component.
Optionally, the determining a first α -axis control quantity in an α β coordinate system based on the d-axis high-frequency component, the current reference value, and the d-axis current component includes:
determining a first current error value based on the d-axis high frequency component, the current reference value, and the d-axis current component;
and inputting the first current error value into a preset first current loop controller to obtain a first alpha axis control quantity of the switching power supply in an alpha beta coordinate system.
Optionally, the determining a first β -axis control quantity in an α β coordinate system based on the q-axis high-frequency component, a preset q-axis current reference value, and the q-axis current component includes:
determining a second current error value based on the q-axis high-frequency component, a preset q-axis current reference value and the q-axis current component;
and inputting the second current error value into a preset second current loop controller to obtain a first beta axis control quantity of the switching power supply in an alpha beta coordinate system.
Optionally, the controlling a switching tube in the switching power supply based on the control quantity includes:
performing coordinate transformation on the output voltage based on the voltage phase of each phase to obtain a d-axis voltage component and a q-axis voltage component of the output voltage;
obtaining a second alpha axis control quantity based on the d axis voltage component, the first alpha axis control quantity and the bus capacitor voltage;
obtaining a second beta axis control quantity based on the q axis voltage component, the first beta axis control quantity and the bus capacitor voltage;
and performing coordinate transformation on the second alpha axis control quantity and the second beta axis control quantity to obtain a control quantity in a dq coordinate system, and controlling a switching tube in the switching power supply based on the control quantity in the dq coordinate system.
In a second aspect of the embodiments of the present invention, there is provided a switching power supply LCL resonance control apparatus, which is applied to a switching power supply circuit formed by connecting a switching power supply and an LCL filter, and includes:
the data acquisition module is used for acquiring the inductive current of the input side of the LCL filter;
the current loop control module is used for extracting a high-frequency component in the inductive current and determining a control quantity of the switching power supply based on the inductive current, the high-frequency component and a preset current reference value;
and the control quantity output module is used for controlling a switching tube in the switching power supply based on the control quantity.
In a third aspect of the embodiments of the present invention, there is provided a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the above-mentioned switching power supply LCL resonance control method when executing the computer program.
In a fourth aspect of the embodiments of the present invention, a computer-readable storage medium is provided, where a computer program is stored, and the computer program, when being executed by a processor, implements the steps of the above-mentioned resonance control method for the switching power supply LCL.
The LCL resonance control method and the LCL resonance control device for the switching power supply have the advantages that:
on one hand, the method is different from a control scheme of sampling capacitor current in the prior art, the resonance control of the LCL of the switching power supply is realized by sampling inductor current, the sampling is simpler and more convenient, and the sampling cost is lower. On the other hand, the invention adds the high-frequency component of the inductive current as the feedback quantity into the calculation of the control quantity, and can cancel the control quantity of the high-frequency part in the control loop, thereby improving the control precision and better inhibiting the LCL resonance of the switching power supply.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flowchart of a resonance control method for a switching power supply LCL according to an embodiment of the present invention;
fig. 2 is a block diagram of a switching power supply LCL resonance control apparatus according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a resonant control loop of a switching power supply LCL according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and fig. 3, fig. 1 is a schematic flow chart of a resonant control method of a switching power supply LCL according to an embodiment of the present invention, and fig. 3 is a schematic diagram of a resonant control loop of the switching power supply LCL according to an embodiment of the present invention, where the resonant control method of the switching power supply LCL is applied to a switching power supply circuit formed by connecting a switching power supply and an LCL filter, and includes:
s101: and acquiring the inductance current at the input side of the LCL filter.
In the present embodiment, the inductor currents are also iLa, iLb, iclc in fig. 3.
S102: and extracting a high-frequency component in the inductive current, and determining a control quantity of the switching power supply based on the inductive current, the high-frequency component and a preset current reference value.
In this embodiment, the high frequency component in the inductor current can be added to the calculation of the control amount of the switching power supply, so as to cancel out the control amount of the high frequency part in the control loop.
S103: and controlling a switching tube in the switching power supply based on the control quantity.
In this embodiment, the switching tube in the switching power supply may be controlled based on the control amount to suppress the LCL resonance of the switching power supply, where the controlling the switching tube in the switching power supply based on the control amount may be detailed as: and determining the duty ratio regulating quantity of the driving pulse of each switching tube on the switching power supply according to the control quantity, and regulating the driving pulse of each switching tube on the switching power supply according to the duty ratio regulating quantity of the driving pulse of each switching tube so as to realize closed-loop control of the switching power supply.
On one hand, the method is different from the control scheme of sampling the capacitor current in the prior art, the resonance of the switch power supply LCL is controlled by sampling the inductor current, the sampling is simpler and more convenient, and the sampling cost is lower. On the other hand, the invention adds the high-frequency component of the inductive current as the feedback quantity into the calculation of the control quantity, and can cancel the control quantity of the high-frequency part in the control loop, thereby improving the control precision and better inhibiting the LCL resonance of the switching power supply.
Optionally, referring to fig. 1 and fig. 3, as a specific implementation of the resonance control method for the switching power supply LCL according to the embodiment of the present invention, the method for determining the preset current reference value includes:
and acquiring the bus capacitor voltage corresponding to the switching power supply.
And determining a preset current reference value according to the bus capacitor voltage and a preset voltage reference value.
In this embodiment, the bus capacitor voltage is also UP + UN in fig. 3.
In this embodiment, a voltage error value may be determined based on the bus capacitor voltage and a preset voltage reference value, and then the voltage error value may be input to a preset voltage loop controller to obtain a current reference value.
Optionally, referring to fig. 1 and fig. 3, as a specific implementation of the resonance control method for the switching power supply LCL according to the embodiment of the present invention, before obtaining the bus capacitor voltage corresponding to the switching power supply, a step of determining the bus capacitor voltage is further included.
The step of determining the bus capacitor voltage comprises:
and acquiring the positive bus capacitor voltage and the negative bus capacitor voltage corresponding to the switching power supply.
And taking the sum of the positive bus capacitor voltage and the negative bus capacitor voltage as the bus capacitor voltage.
In this embodiment, the positive bus capacitor voltage, i.e., UP in fig. 3, and the negative bus capacitor voltage, i.e., UN in fig. 3.
Optionally, referring to fig. 1 and fig. 3, as a specific implementation of the resonance control method for the switching power supply LCL according to the embodiment of the present invention, determining the current reference value according to the bus capacitor voltage and the preset voltage reference value includes:
the voltage error value is determined based on the bus capacitor voltage UP + UN and a preset voltage reference value Ubusref.
And inputting the voltage error value into a preset voltage loop controller to obtain a current reference value iDref.
In this embodiment, the preset voltage loop controller may be a proportional-integral controller, or may be a composite controller composed of a proportional-integral controller and a repetitive controller, and is not limited herein.
Optionally, referring to fig. 1 and fig. 3, as a specific implementation of the resonance control method for the switching power supply LCL according to the embodiment of the present invention, before extracting a high-frequency component in the inductor current and determining a control amount of the switching power supply based on the inductor current, the high-frequency component, and the current reference value, a step of performing coordinate transformation on the inductor current is further included.
The step of transforming the coordinates of the inductor current comprises:
and acquiring output voltages (namely Uca, Ucb and Ucc) of the output side of the switching power supply, and performing phase extraction on the output voltages to obtain voltage phases of all phases of the output side of the switching power supply.
The inductor current is subjected to coordinate transformation based on the voltage phase of each phase, and a d-axis current component iLd and a q-axis current component iLq of the inductor current in a dq coordinate system are obtained.
In this embodiment, the coordinate transformation of the inductor current based on the voltage phase of each phase to obtain the d-axis current component and the q-axis current component of the inductor current in the dq coordinate system includes:
clark conversion is carried out on the inductive current based on the voltage phase of each phase to obtain two-phase current under an alpha beta coordinate system, Park conversion is carried out on the two-phase current under the alpha beta coordinate system to obtain iLd and q-axis current components iLq of the inductive current under a dq coordinate system.
Optionally, referring to fig. 1 and fig. 3, as a specific implementation of the resonance control method for the switching power supply LCL provided by the embodiment of the present invention, the extracting the high-frequency component in the inductor current includes:
and respectively inputting the d-axis current component and the q-axis current component into a preset high-pass filter GC(s) to obtain a d-axis high-frequency component and a q-axis current component of the inductive current.
In the present embodiment, the high-pass filter gc(s) is used to extract the high-frequency resonance component in the inductor current, and may be a first-order high-pass filter, a second-order high-pass filter, or a higher-order high-pass filter.
Optionally, as a specific implementation manner of the resonance control method for the switching power supply LCL provided by the embodiment of the present invention, the high-frequency component includes a d-axis high-frequency component and a q-axis high-frequency component, and the control amount of the switching power supply includes a first α -axis control amount and a first β -axis control amount of the switching power supply in an α β coordinate system.
Determining a control quantity of the switching power supply based on the inductive current, the high-frequency component and the current reference value, comprising:
a first alpha-axis control amount in an alpha beta coordinate system is determined based on the d-axis high-frequency component, the current reference value, and the d-axis current component.
And determining a first beta axis control quantity in an alpha beta coordinate system based on the q axis high frequency component, a preset q axis current reference value and the q axis current component.
Optionally, referring to fig. 1 and fig. 3, as a specific implementation of the resonance control method for the switching power supply LCL according to the embodiment of the present invention, the determining a first α -axis control quantity in an α β coordinate system based on the d-axis high-frequency component, the current reference value, and the d-axis current component includes:
a first current error value is determined based on the d-axis high frequency component, the current reference value, and the d-axis current component.
And inputting the first current error value into a preset first current loop controller to obtain a first alpha axis control quantity of the switching power supply under an alpha beta coordinate system.
In the present embodiment, the first current error value is equal to the d-axis high-frequency component iLd + the current reference value iDref — d-axis current component.
In this embodiment, the first current loop controller may be a proportional integral controller.
Optionally, referring to fig. 1 and fig. 3, as a specific implementation of the resonance control method for the switching power supply LCL according to the embodiment of the present invention, determining a first β -axis control quantity in an α β coordinate system based on the q-axis high-frequency component, a preset q-axis current reference value, and the q-axis current component includes:
a second current error value is determined based on the q-axis high frequency component, a preset q-axis current reference value, and the q-axis current component.
And inputting the second current error value into a preset second current loop controller to obtain a first beta axis control quantity of the switching power supply under an alpha beta coordinate system.
In the present embodiment, the second current error value is the q-axis high frequency component iLq + the preset q-axis current reference value iQref-q-axis current component. Wherein the q-axis current reference value iQref may be set to 0.
The second current loop controller may be a proportional-integral controller, and the first current loop controller and the second current loop controller may be the same or different.
Optionally, referring to fig. 1 and fig. 3, as a specific implementation of the resonance control method for the switching power supply LCL provided by the embodiment of the present invention, the controlling the switching tube in the switching power supply based on the control quantity includes:
and performing coordinate transformation on the output voltage based on the voltage phase of each phase to obtain a d-axis voltage component and a q-axis voltage component of the output voltage.
The second α -axis control amount U α is obtained based on the d-axis voltage component Ucd, the first α -axis control amount, and the bus capacitance voltage.
And obtaining a second beta axis control quantity Ubeta based on the q axis voltage component Ucq, the first beta axis control quantity and the bus capacitor voltage.
And performing coordinate transformation on the second alpha axis control quantity and the second beta axis control quantity to obtain a control quantity in a dq coordinate system, and controlling a switching tube in the switching power supply based on the control quantity in the dq coordinate system.
In this embodiment, the method for obtaining the second α -axis control quantity U α based on the d-axis voltage component, the first α -axis control quantity, and the bus capacitor voltage includes:
the second α -axis control amount U α is (d-axis voltage component Ucd + first α -axis control amount)/(bus capacitance voltage UN + UP).
In this embodiment, the method for obtaining the second β -axis controlled variable U β based on the q-axis voltage component Ucq, the first β -axis controlled variable, and the bus capacitor voltage includes:
the second β -axis control amount U β is (q-axis voltage component Ucq + first β -axis control amount)/(bus capacitance voltage UN + UP).
In this embodiment, the controlling the switching tube in the switching power supply based on the control quantity in the dq coordinate system may be detailed as follows: and determining the duty ratio regulating quantity of the driving pulse of each switching tube on the switching power supply based on the control quantity under the dq coordinate system, and regulating the driving pulse of each switching tube on the switching power supply according to the duty ratio regulating quantity of the driving pulse of each switching tube so as to realize closed-loop control of the switching power supply.
Fig. 2 is a block diagram of a resonant control device of a switching power supply LCL according to an embodiment of the present invention, which corresponds to the resonant control method of the switching power supply LCL according to the above embodiment. For convenience of explanation, only portions related to the embodiments of the present invention are shown. Referring to fig. 2, the switching power supply LCL resonance control apparatus 20 is applied to a switching power supply circuit formed by connecting a switching power supply and an LCL filter, and includes: the device comprises a data acquisition module 21, a current loop control module 23 and a control quantity output module 24.
The data obtaining module 21 is configured to obtain an inductor current at an input side of the LCL filter.
And the current loop control module 23 is configured to extract a high-frequency component in the inductor current, and determine a control amount of the switching power supply based on the inductor current, the high-frequency component, and a preset current reference value.
And a control quantity output module 24 for controlling the switching tube in the switching power supply based on the control quantity.
Optionally, referring to fig. 2, as a specific implementation manner of the switching power supply LCL resonance control apparatus provided in the embodiment of the present invention, the switching power supply LCL resonance control apparatus 20 may further include a voltage loop control module 22.
And the voltage ring control module 22 is configured to obtain a bus capacitor voltage corresponding to the switching power supply, and determine a current reference value according to the bus capacitor voltage and a preset voltage reference value.
Optionally, as a specific implementation manner of the switching power supply LCL resonance control apparatus provided in the embodiment of the present invention, before the bus capacitor voltage corresponding to the switching power supply is obtained, a step of determining the bus capacitor voltage is further included.
The step of determining the bus capacitor voltage comprises:
and acquiring the positive bus capacitor voltage and the negative bus capacitor voltage corresponding to the switching power supply.
And taking the sum of the positive bus capacitor voltage and the negative bus capacitor voltage as the bus capacitor voltage.
Optionally, as a specific implementation manner of the switching power supply LCL resonance control apparatus provided in the embodiment of the present invention, determining the current reference value according to the bus capacitor voltage and a preset voltage reference value includes:
and determining a voltage error value based on the bus capacitor voltage and a preset voltage reference value.
And inputting the voltage error value into a preset voltage loop controller to obtain a current reference value.
Optionally, as a specific implementation manner of the switching power supply LCL resonance control apparatus provided in the embodiment of the present invention, before extracting a high-frequency component in the inductor current and determining a control amount of the switching power supply based on the inductor current, the high-frequency component, and the current reference value, a step of performing coordinate transformation on the inductor current is further included.
The step of transforming the coordinates of the inductor current comprises:
and acquiring the output voltage of the output side of the switching power supply, and performing phase extraction on the output voltage to obtain the voltage phase of each phase of the output side of the switching power supply.
And performing coordinate transformation on the inductive current based on the voltage phase of each phase to obtain a d-axis current component and a q-axis current component of the inductive current in a dq coordinate system.
Optionally, as a specific implementation manner of the switching power supply LCL resonance control apparatus provided in the embodiment of the present invention, the extracting a high-frequency component in an inductor current includes:
and respectively inputting the d-axis current component and the q-axis current component into a preset high-pass filter to obtain a d-axis high-frequency component and a q-axis high-frequency component of the inductive current.
Optionally, as a specific implementation manner of the switching power supply LCL resonance control apparatus provided by the embodiment of the present invention, the high-frequency component includes a d-axis high-frequency component and a q-axis high-frequency component, and the control amount of the switching power supply includes a first α -axis control amount and a first β -axis control amount of the switching power supply in an α β coordinate system.
Determining a control quantity of the switching power supply based on the inductive current, the high-frequency component and the current reference value, comprising:
a first alpha-axis control amount in an alpha beta coordinate system is determined based on the d-axis high-frequency component, the current reference value, and the d-axis current component.
And determining a first beta axis control quantity in an alpha beta coordinate system based on the q axis high frequency component, a preset q axis current reference value and the q axis current component.
Optionally, as a specific implementation manner of the switching power supply LCL resonance control apparatus provided in the embodiment of the present invention, the determining a first α -axis control quantity in an α β coordinate system based on the d-axis high-frequency component, the current reference value, and the d-axis current component includes:
a first current error value is determined based on the d-axis high frequency component, the current reference value, and the d-axis current component.
And inputting the first current error value into a preset first current loop controller to obtain a first alpha axis control quantity of the switching power supply under an alpha beta coordinate system.
Optionally, as a specific implementation manner of the switching power supply LCL resonance control apparatus provided in the embodiment of the present invention, the determining a first β -axis control quantity in an α β coordinate system based on the q-axis high-frequency component, a preset q-axis current reference value, and the q-axis current component includes:
a second current error value is determined based on the q-axis high frequency component, a preset q-axis current reference value, and the q-axis current component.
And inputting the second current error value into a preset second current loop controller to obtain a first beta axis control quantity of the switching power supply under an alpha beta coordinate system.
Optionally, as a specific implementation manner of the switching power supply LCL resonance control apparatus provided in the embodiment of the present invention, controlling a switching tube in the switching power supply based on a control amount includes:
and performing coordinate transformation on the output voltage based on the voltage phase of each phase to obtain a d-axis voltage component and a q-axis voltage component of the output voltage.
And obtaining a second alpha axis control quantity based on the d axis voltage component, the first alpha axis control quantity and the bus capacitor voltage.
And obtaining a second beta axis control quantity based on the q axis voltage component, the first beta axis control quantity and the bus capacitor voltage.
And performing coordinate transformation on the second alpha axis control quantity and the second beta axis control quantity to obtain a control quantity in a dq coordinate system, and controlling a switching tube in the switching power supply based on the control quantity in the dq coordinate system.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A resonance control method for a switch power supply LCL is applied to a switch power supply circuit formed by connecting a switch power supply and an LCL filter, and is characterized by comprising the following steps:
obtaining an inductive current at the input side of the LCL filter;
extracting a high-frequency component in the inductive current, and determining a control quantity of the switching power supply based on the inductive current, the high-frequency component and a preset current reference value;
and controlling a switching tube in the switching power supply based on the control quantity.
2. The LCL resonance control method of the switching power supply according to claim 1, wherein the predetermined current reference value is determined by:
acquiring bus capacitor voltage corresponding to a switching power supply;
and determining a preset current reference value according to the bus capacitor voltage and a preset voltage reference value.
3. The LCL resonance control method of the switching power supply according to claim 2, wherein the determining a current reference value according to the bus capacitor voltage and a preset voltage reference value comprises:
determining a voltage error value based on the bus capacitor voltage and a preset voltage reference value;
and inputting the voltage error value into a preset voltage loop controller to obtain a current reference value.
4. The LCL resonance control method for the switching power supply as claimed in claim 2, further comprising a step of performing coordinate transformation on the inductor current before extracting a high frequency component in the inductor current and determining a control amount of the switching power supply based on the inductor current, the high frequency component and the current reference value;
the step of transforming the coordinates of the inductor current comprises:
acquiring output voltage of the output side of the switching power supply, and performing phase extraction on the output voltage to obtain voltage phases of all phases of the output side of the switching power supply;
and carrying out coordinate transformation on the inductive current based on the voltage phase of each phase to obtain a d-axis current component and a q-axis current component of the inductive current in a dq coordinate system.
5. The LCL resonance control method of claim 4, wherein said extracting high frequency components in the inductor current comprises:
and respectively inputting the d-axis current component and the q-axis current component into a preset high-pass filter to obtain a d-axis high-frequency component and a q-axis high-frequency component of the inductive current.
6. The LCL resonance control method of the switching power supply as claimed in claim 4, wherein the high frequency components include d-axis high frequency components and q-axis high frequency components, and the control quantity of the switching power supply includes a first α -axis control quantity and a first β -axis control quantity of the switching power supply in an α β coordinate system;
the determining a control amount of the switching power supply based on the inductor current, the high frequency component, and the current reference value includes:
determining a first alpha-axis control quantity in an alpha-beta coordinate system based on the d-axis high-frequency component, the current reference value and the d-axis current component;
and determining a first beta axis control quantity under an alpha beta coordinate system based on the q axis high frequency component, a preset q axis current reference value and the q axis current component.
7. The LCL resonance control method of the switching power supply as claimed in claim 6, wherein said determining a first α -axis control quantity in an α β coordinate system based on the d-axis high frequency component, the current reference value, and the d-axis current component comprises:
determining a first current error value based on the d-axis high frequency component, the current reference value, and the d-axis current component;
and inputting the first current error value into a preset first current loop controller to obtain a first alpha axis control quantity of the switching power supply in an alpha beta coordinate system.
8. The LCL resonance control method of claim 6, wherein the determining a first β -axis control quantity in an α β coordinate system based on the q-axis high frequency component, a preset q-axis current reference value, and the q-axis current component comprises:
determining a second current error value based on the q-axis high-frequency component, a preset q-axis current reference value and the q-axis current component;
and inputting the second current error value into a preset second current loop controller to obtain a first beta axis control quantity of the switching power supply in an alpha beta coordinate system.
9. The LCL resonance control method of the switching power supply as claimed in claim 6, wherein the controlling the switching tube in the switching power supply based on the control quantity comprises:
performing coordinate transformation on the output voltage based on the voltage phase of each phase to obtain a d-axis voltage component and a q-axis voltage component of the output voltage;
obtaining a second alpha axis control quantity based on the d axis voltage component, the first alpha axis control quantity and the bus capacitor voltage;
obtaining a second beta axis control quantity based on the q axis voltage component, the first beta axis control quantity and the bus capacitor voltage;
and performing coordinate transformation on the second alpha axis control quantity and the second beta axis control quantity to obtain a control quantity in a dq coordinate system, and controlling a switching tube in the switching power supply based on the control quantity in the dq coordinate system.
10. A switching power supply LCL resonance control device is applied to a switching power supply circuit formed by connecting a switching power supply and an LCL filter, and is characterized by comprising the following components:
the data acquisition module is used for acquiring the inductive current of the input side of the LCL filter;
the current loop control module is used for extracting a high-frequency component in the inductive current and determining a control quantity of the switching power supply based on the inductive current, the high-frequency component and a preset current reference value;
and the control quantity output module is used for controlling a switching tube in the switching power supply based on the control quantity.
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