CN116995903B - Double frequency ripple current control method and device and computer equipment - Google Patents
Double frequency ripple current control method and device and computer equipment Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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
- H02M3/33569—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 several active switching elements
- H02M3/33573—Full-bridge at primary side of an isolation transformer
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application relates to a double frequency ripple current control method, a device and computer equipment, wherein the double frequency ripple current control method is applied to a two-stage inverter circuit, the two-stage inverter circuit comprises a resonance conversion module and a bus capacitor, and the bus capacitor is used for performing anti-interference processing on signals input to the inverter module; the method comprises the steps of obtaining the output voltage of a bus capacitor and the resonance frequency of a resonance transformation module; amplifying and filtering the output voltage to obtain a frequency adjustment quantity; superposing the resonant frequency and the frequency adjustment amount to obtain a target working frequency; the resonant conversion module is controlled to work at a target working frequency so as to adjust the output impedance of the resonant conversion module at the frequency doubling position, and then ripple current at the frequency doubling position is suppressed. The method and the device can enable the resonant conversion module to work in the quasi-fixed frequency mode all the time, and remarkably improve the output impedance of the resonant conversion module at the frequency doubling position, so that the frequency doubling ripple current is restrained.
Description
Technical Field
The application relates to the technical field of micro-grids, in particular to a frequency doubling ripple current control method, a frequency doubling ripple current control device and computer equipment.
Background
The two-stage single-phase inverter is widely applied to the technical field of micro-grids, wherein a front-stage LLC (resonant conversion circuit) converter realizes voltage matching and electrical isolation, and a rear-stage single-phase inverter inverts direct current obtained by a front stage into required alternating current. For a single-phase inverter, the instantaneous output power is not constant, but rather ripples at twice the output frequency, which will cause a ripple current in the preceding LLC converter and in the input source at twice the output voltage frequency, the so-called double frequency ripple current. The double frequency ripple current can reduce the system efficiency, shorten the service life of the battery module and increase the current stress and on-state loss of the switching tube.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a method, apparatus, and computer device capable of suppressing double frequency ripple current in a two-stage inverter.
In a first aspect, the present application provides a frequency doubling ripple current control method, which is applied to a two-stage inverter circuit, where the two-stage inverter circuit includes a front-stage resonant conversion module, a bus capacitor, and a rear-stage inverter module that are sequentially connected, and the method includes:
obtaining the output voltage of the bus capacitor and the resonant frequency of the resonant conversion module;
amplifying and filtering the output voltage to obtain a frequency adjustment quantity;
superposing the resonant frequency and the frequency adjustment amount to obtain a target working frequency;
and controlling the resonant conversion module to work at the target working frequency so as to adjust the output impedance of the resonant conversion module at the frequency doubling position, and further inhibiting the ripple current at the frequency doubling position.
In one embodiment, the amplifying and filtering the output voltage to obtain the frequency adjustment includes:
amplifying the output voltage according to a preset feedforward proportional coefficient;
and filtering the amplified output voltage through a second-order band-pass filter to obtain the frequency adjustment quantity.
In one embodiment, the formula for obtaining the frequency adjustment is:
wherein,an amount of adjustment for the frequency; v bus For the output voltage; k is a feedforward proportional coefficient of the output voltage; g BPF (s) is a characteristic frequency of 2f 0 Is a second order bandpass filter transfer function, f 0 And the fundamental frequency of the voltage and the current output by the rear-stage inversion module.
In one embodiment, the characteristic frequency is 2f 0 The transfer function of the second order band pass filter of (2) is:
wherein,for damping coefficient omega 0 Is the angular frequency of the second harmonic.
In one embodiment, the superimposing the resonance frequency and the frequency adjustment amount to obtain the target operating frequency includes:
and taking the superposition result of the resonant frequency and the frequency adjustment amount as the target working frequency, and controlling the difference value between the target working frequency and the resonant frequency to be in a target range.
In one embodiment, the expression of the target operating frequency is:
wherein f r For the said resonant frequency of the wave-guide,a limit value is adjusted for the target.
In one embodiment, the output impedance calculation formula of the resonant conversion module is:
；
wherein Z(s) is the output impedance, Z LLC (s) is the output impedance of the resonant conversion module when working at the resonant frequency, K is the feedforward scaling factor of the output voltage amplified in the scaling link; g BPF (s) is a characteristic frequency of 2f 0 A transfer function of a second order bandpass filter of (a); f (f) 0 Fundamental frequency of voltage and current output by the rear-stage inversion module; c (C) bus And the capacitance value of the bus capacitor.
In a second aspect, the present application further provides a frequency-doubled ripple current control device, the device including:
the detection module is used for acquiring the output voltage of the bus capacitor and the resonant frequency of the resonant conversion module;
the first signal processing module is used for amplifying and filtering the output voltage to obtain a frequency adjustment quantity;
the second signal processing module is used for carrying out superposition processing on the resonant frequency and the frequency adjustment quantity so as to obtain a target working frequency;
and the adjusting module is used for controlling the resonant conversion module to work at the target working frequency so as to adjust the output impedance of the resonant conversion module at the frequency doubling position and further inhibit the ripple current at the frequency doubling position.
In a third aspect, the present application further provides a computer device, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the above-mentioned double frequency ripple current control method when executing the computer program.
In a fourth aspect, the present application also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the above-described double frequency ripple current control method.
The double frequency ripple current control method, the device and the computer equipment are applied to a two-stage inverter circuit, wherein the two-stage inverter circuit comprises a resonant conversion module and a bus capacitor, and the bus capacitor is used for performing anti-interference treatment on signals input to the inverter module; the method comprises the steps of obtaining the output voltage of a bus capacitor and the resonance frequency of a resonance transformation module; amplifying and filtering the output voltage to obtain a frequency adjustment quantity; superposing the resonant frequency and the frequency adjustment amount to obtain a target working frequency; the resonant conversion module is controlled to work at a target working frequency so as to adjust the output impedance of the resonant conversion module at the frequency doubling position, and then ripple current at the frequency doubling position is suppressed. Therefore, the actual working frequency of the resonant conversion module is controlled to be the target working frequency, so that the resonant conversion module always works in the quasi-fixed frequency mode, the output impedance of the resonant conversion module at the frequency doubling position is obviously improved, and the frequency doubling ripple current is restrained.
Drawings
FIG. 1 is a schematic diagram of a two-stage inverter circuit in one embodiment;
FIG. 2 is a topology of a two-stage inverter with a resonant conversion module at a front stage in one embodiment;
FIG. 3 is a flow chart of a method of controlling a double frequency ripple current according to an embodiment;
FIG. 4 is a flow chart of amplifying and filtering the output voltage to obtain the frequency adjustment in one embodiment;
FIG. 5 is a diagram of a two-stage inverter AC small signal equivalent circuit for the resonant conversion module operating and resonant frequency in one embodiment;
FIG. 6 (a) is a control block diagram of a resonant conversion module operating at a resonant frequency in one embodiment;
FIG. 6 (b) is an equivalent control block diagram corresponding to a double frequency ripple current control method in one embodiment;
FIG. 7 is an equivalent output impedance Z relative to a conventional resonant converter in one embodiment LLC (s)The Bode diagram of equivalent output impedance Z(s) of the resonant conversion module after the frequency doubling ripple current control method is adopted;
FIG. 8 is a graph comparing the results of adding the current ripple before and after the current ripple control method of double frequency ripple according to the present application;
FIG. 9 is a block diagram of a control device for doubling the ripple current in one embodiment;
fig. 10 is an internal structural view of a computer device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The frequency doubling ripple current control method provided by the embodiment of the application can be applied to a two-stage inverter circuit shown in fig. 1. The two-stage inverter circuit 100 includes a front-stage resonant conversion module 110, a bus capacitor 120 connected to the resonant conversion module 110, and a rear-stage inverter module 130.
Wherein the resonant conversion module 110 may also be called an LLC resonant converter, and the resonant conversion module 110 is connected to a dc voltage input source to be connected to a dc voltage V in The method comprises the steps of carrying out a first treatment on the surface of the Bus capacitor 120C bus Is connected with the resonance transformation module 110 and the inversion module 130; the inverter module 130 may also be referred to as a back-end DC-AC inverter. Specifically, the output voltage and current of the inverter module 130 may be expressed as:
wherein V is 0 For the magnitude of the output voltage of the inverter module 130, I 0 For the magnitude of the output current of the inverter module 130, f 0 To output the fundamental frequency of the voltage and output current to the inverter module 130,is the reverse ofLoad impedance angle of the variable module 130.
Further, the instantaneous power P output by the inverter module 130 0 (t) is:
wherein the instantaneous power P 0 (t) can be converted into:
typically, when the bus capacitor 120C bus When sufficiently large, the output voltage of the bus capacitor 120 can be approximated as:
assuming that the system is lossless and is conserved by the input/output power, the input current i of the inverter module 130 inv (t) is:
wherein I is dc Input the direct current component of the current to the inverter module 130, i SHC (t) is a frequency-doubled component of the input current of the inverter module 130.
If no control strategy is added, the frequency doubling current component i SHC (t) an input current i that must propagate to a DC voltage source connected to the resonant conversion module 110 in (t) reducing system efficiency and shortening the service life of the battery module.
Referring to fig. 2, fig. 2 is a topology of a two-stage inverter of the resonant conversion module of the present application, and an input current i of an inverter module (not shown in fig. 2) of a subsequent stage inv (t) the DC component I dc And a secondary ripple current component i SHC (t) two parts, so that the inverter modules of the later stage can be equivalent to a parallel direct current source I dc And a secondary ripple current source i SHC (t). As shown in FIG. 2, wherein S 1 ~S 4 、D 1 ~D 4 For primary side switching tube and secondary side diode of resonant conversion module 110, L r 、C r 、L m Respectively a resonance inductance, a resonance capacitance and an excitation inductance, T r Is a transformer with the primary and secondary side turn ratio of N1.
In one embodiment, as shown in fig. 3, a method for controlling a double frequency ripple current is provided, which is described by taking the method applied to the two-stage inverter circuit in fig. 1 as an example, and includes the following steps 302 to 308:
and step 302, obtaining the output voltage of the bus capacitor and the resonant frequency of the resonant conversion module.
It can be understood that the output voltage of the bus capacitor is the voltage v of the bus capacitor 120 in fig. 1 bus 。
And step 304, amplifying and filtering the output voltage to obtain a frequency adjustment amount.
The process of amplifying and filtering the output voltage to obtain the frequency adjustment amount as shown in fig. 4 includes steps 3042 to 3044.
Step 3042: and amplifying the output voltage according to a preset feedforward proportional coefficient.
Step 3044: and filtering the amplified output voltage through a second-order band-pass filter to obtain the frequency adjustment quantity.
Specifically, according to the voltage value v bus The frequency adjustment quantity of the resonance transformation module is obtained after the amplification treatment and the second-order band-pass filter treatment of the proportion amplification link. Specifically, the frequency modulation amount +.>The method comprises the following steps:
wherein K is v bus Feedforward scaling coefficient of G BPF (s) is a characteristic frequency of 2f 0 Is provided.
Further, the two-stage inverter circuit further comprises an inverter module, wherein f is as follows 0 The fundamental frequency of the voltage and the current output by the rear-stage inversion module is 2f 0 The transfer function of the second order band pass filter of (2) is:
wherein,for damping coefficient omega 0 Is the angular frequency of the second harmonic.
And 306, superposing the resonant frequency and the frequency adjustment amount to obtain a target working frequency.
The step of performing superposition processing on the resonant frequency and the frequency adjustment amount to obtain a target operating frequency includes: and taking the superposition result of the resonant frequency and the frequency adjustment amount as the target working frequency, and controlling the difference value between the target working frequency and the resonant frequency to be in a target range. Specifically, the resonant frequency of the resonant conversion module is overlapped with the frequency adjustment amount to be used as the target working frequency f of the resonant conversion module s And controlling the target operating frequency of the resonant conversion module to be finely tuned around the resonant frequency. Specifically, the target operating frequency f of the resonant conversion module s The method comprises the following steps:
wherein f r For the said resonant frequency of the wave-guide,the limit value is adjusted for the target. Since the resonant conversion module operates at the resonant frequency, i.e. f s =f r The soft switching effect is best and the efficiency is highest, so the frequency adjustment can be realized by combining the efficiency of the converter and the double frequency ripple suppression effectIs arranged as=（5%~10%）×f r . The target adjustment limit valueCan also be understood as resonant frequency f r Is set in the above-described state.
And 308, controlling the resonant conversion module to work at the target working frequency so as to adjust the output impedance of the resonant conversion module at the frequency doubling position, and further inhibiting the ripple current at the frequency doubling position.
It will be appreciated that the resonant conversion module described above operates at a target operating frequency, and that the resonant conversion module may operate at a particular operating frequency, or may be considered to operate at or near a particular operating frequency. That is, the target operating frequency may be a specific operating frequency value or a specific operating frequency range. For example, when the resonance frequency and the frequency adjustment amount are superimposed to obtain Y, the target operating frequency may be Y or y±0.5. Wherein Y is any positive number.
For example, when the resonant conversion module is operating at the target operating frequency, the resonant conversion module may be considered to be operating in a fixed frequency mode at this time. An equivalent circuit diagram of the ac small signal of the two-stage inverter in which the resonant conversion module operates at the resonant frequency at this time may be as shown in fig. 5, in which,、/>、/>、/>、/>AC small signals of input voltage, input current, secondary side current of transformer, bus voltage and input current of inverter respectively, Z LLC (s) is the output impedance of the fixed frequency resonant conversion module when operating at the resonant frequency, and can be expressed as:
wherein, the primary and secondary side turn ratio of the N transformer, omega r For the resonant angular frequency, R eq For equivalent AC load, L r 、C r Is resonant inductance and resonant capacitance, L eq Is L r And C r Is equivalent to the series inductance of X eq Representing L at resonant frequency r And C r Is a series impedance of (a).
Specifically, the bus capacitance includes capacitance (i.e., bus capacitance); the output impedance calculation formula of the resonance transformation module is as follows:
；
wherein Z(s) is the output impedance, Z LLC (s) is the output impedance of the resonant conversion module when working at the resonant frequency, K is the feedforward scaling factor of the output voltage amplified in the scaling link; g BPF (s) is a characteristic frequency of 2f 0 A transfer function of a second order bandpass filter of (a); f (f) 0 Fundamental frequency of voltage and current output by the rear-stage inversion module; c (C) bus And the capacitance value of the bus capacitor.
In this embodiment, the double frequency ripple current control method is applied to a two-stage inverter circuit, where the two-stage inverter circuit includes a resonant conversion module and a bus capacitor, and the bus capacitor is used to perform anti-interference processing on a signal input to the inverter module; the method comprises the steps of obtaining the output voltage of a bus capacitor and the resonance frequency of a resonance transformation module; amplifying and filtering the output voltage to obtain a frequency adjustment quantity; superposing the resonant frequency and the frequency adjustment amount to obtain a target working frequency; the resonant conversion module is controlled to work at a target working frequency so as to adjust the output impedance of the resonant conversion module at the frequency doubling position, and then ripple current at the frequency doubling position is suppressed. Therefore, the actual working frequency of the resonant conversion module is controlled to be the target working frequency, so that the resonant conversion module always works in the quasi-fixed frequency mode, the output impedance of the resonant conversion module at the frequency doubling position is obviously improved, and the frequency doubling ripple current is restrained.
In one embodiment, referring to the control block diagram of the resonant conversion module operating at resonant frequency shown in FIG. 6 (a), due to the input current i of the inverter module inv The disturbance quantity is negligible for the whole system during modeling. Then from fig. 6 (a), the system model when the resonant conversion module operates at the resonant frequency is:
further, according to a system model when the resonant conversion module operates at a resonant frequency, the input/output relationship of the voltage when the resonant conversion module operates at the resonant frequency can be expressed as:
further reference is made to an equivalent control block diagram corresponding to the frequency doubling ripple current control method as shown in fig. 6 (b). Specifically, first, the obtained bus capacitor voltage (i.e., the output voltage of the bus capacitor) v bus The frequency adjustment quantity of the resonance conversion module is obtained after the processing of the proportional amplification link and the band-pass filterThen, the resonant frequency f of the resonant conversion module is set r And frequency adjustment quantity->Superposition, the obtained frequency value is used as the working frequency f of the final resonant conversion module s 。
As can be seen from the above process, the double frequency ripple current control method of the present application essentially fine-tunes the operating frequency of the resonant conversion module, so that the resonant conversion module always operates near the resonant frequency, i.e. in the quasi-fixed frequency mode. Conversion to DC voltage input measurement equivalent to approximate operation of the resonant conversion module at resonant frequency f r But at input voltage V in Voltage ripple pulse with frequency doubling introducedv in . Therefore, the equivalent circuit and the control block diagram of the timing LLC ac small signal shown in fig. 5 and fig. 6 (a) are still applicable, and further the control block diagram shown in fig. 6 (b) when the control method according to the present invention is adopted can be obtained.
As can be seen from FIG. 6 (b), when the present invention is employedWhen the control method is used, the system disturbance quantity i is ignored inv The input-output relationship of the resonant transformation module can be expressed as:
further, the above formula can be written as:
analog formulaIt can be seen that, after the frequency doubling ripple current control method of the present application is adopted, the equivalent output impedance Z(s) of the resonant conversion module becomes:
further, Z(s) can be written as:
wherein Z is LLC (s) operating the resonant conversion module at the resonant frequency f r Output impedance at time C bus Is the bus capacitor.
In one embodiment, referring to FIG. 7, FIG. 7 is an equivalent output impedance Z relative to a conventional resonant converter LLC And(s) a Bode diagram of equivalent output impedance Z(s) of the resonant conversion module after the frequency doubling ripple current control method is adopted. As can be seen from FIG. 7, the frequency doubling 2f is significantly improved by the frequency doubling ripple current control method 0 The output impedance of the resonant transformation module forces i inv The double frequency ripple current in (a) is mainly generated from the bus capacitor C bus Transfer to the preceding resonant conversion module is avoided, thereby inhibiting the input current i of the direct current voltage source in Is a double frequency current ripple in (a).
In some embodiments, referring to fig. 8, fig. 8 is a graph comparing the results of adding the double frequency ripple current control method provided in the present application to the double frequency ripple current according to the embodiment of the present application. As can be seen from fig. 8, according to the control method provided by the present application, the current i is input at the dc side in the steady state in The frequency doubling current component in the (a) is effectively suppressed.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a control device for realizing the frequency doubling ripple current of the related frequency doubling ripple current control method. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation in the embodiments of the control device for the double frequency ripple current provided below may be referred to the limitation of the double frequency ripple current control method hereinabove, and will not be repeated here.
In one embodiment, as shown in fig. 9, a frequency-doubled ripple current control device is provided, where a frequency-doubled ripple current control device 900 includes a detection module 910, a first signal processing module 920, a second signal processing module 930, and a regulation module 940. Wherein:
and the detection module 910 is configured to obtain an output voltage of the bus capacitor and a resonant frequency of the resonant conversion module.
The first signal processing module 920 is configured to amplify and filter the output voltage to obtain a frequency adjustment amount.
And a second signal processing module 930, configured to perform superposition processing on the resonant frequency and the frequency adjustment amount to obtain a target operating frequency.
And the adjusting module 940 is used for controlling the resonant conversion module to adjust the output impedance of the resonant conversion module at the frequency doubling position, so as to inhibit the ripple current at the frequency doubling position.
In one embodiment, the first signal processing module is further configured to amplify the output voltage according to a preset feedforward scaling factor; and filtering the amplified output voltage through a second-order band-pass filter to obtain the frequency adjustment quantity.
In one embodiment, the formula for obtaining the frequency adjustment amount by the first signal processing module is:
wherein,an amount of adjustment for the frequency; v bus For the output voltage; k is a feedforward proportional coefficient of the output voltage; g BPF (s) is a characteristic frequency of 2f 0 Is a second order bandpass filter transfer function, f 0 And the fundamental frequency of the voltage and the current output by the rear-stage inversion module.
In one embodiment, the two-stage inverter circuit further comprises an inverter module; the characteristic frequency used by the first signal processing module in the previous embodiment is 2f 0 The transfer function of the second order band pass filter of (2) is:
wherein,for damping coefficient omega 0 Is the angular frequency of the second harmonic.
In one embodiment, the first signal processing module is configured to take a result of superposition of the resonant frequency and the frequency adjustment amount as the target operating frequency, and control a difference between the target operating frequency and the resonant frequency to be within a target range.
In one embodiment, the first signal processing module is configured to perform superposition processing on the resonant frequency and the frequency adjustment amount to obtain a target operating frequency, including:
wherein f r For the said resonant frequency of the wave-guide,the limit value is adjusted for the target.
In one embodiment, the bus capacitor comprises a capacitor; the adjusting module is used for controlling the resonant conversion module to work at the target working frequency so as to adjust the output impedance of the resonant conversion module at the frequency doubling position and further inhibit ripple current at the frequency doubling position, wherein the output impedance calculation formula of the resonant conversion module is as follows:
；
wherein Z(s) is the output impedance, Z LLC (s) is the output impedance of the resonant conversion module when working at the resonant frequency, K is the feedforward proportionality coefficient of the output voltage amplified in the proportionality link; g BPF (s) is a characteristic frequency of 2f 0 A transfer function of a second order bandpass filter of (a); f (f) 0 Fundamental frequency of voltage and current output by the rear-stage inversion module; c (C) bus And the capacitance value of the bus capacitor.
The above-mentioned various modules in the control device of the double frequency ripple current may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a server, and the internal structure of which may be as shown in fig. 10. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer equipment is used for storing various data in the frequency doubling ripple current control method. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of double frequency ripple current control.
It will be appreciated by those skilled in the art that the structure shown in fig. 10 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, implements the steps of the method embodiments described above.
In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.
It should be noted that, user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as Static Random access memory (Static Random access memory AccessMemory, SRAM) or dynamic Random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (8)
1. The utility model provides a double frequency ripple current control method which is characterized in that is applied to two-stage inverter circuit, two-stage inverter circuit includes preceding resonant conversion module, busbar electric capacity and the back level inverter module that connects gradually, and the method includes:
obtaining the output voltage of the bus capacitor and the resonant frequency of the resonant conversion module;
amplifying the output voltage according to a preset feedforward proportional coefficient;
filtering the amplified output voltage through a second-order band-pass filter to obtain a frequency adjustment quantity; the formula for obtaining the frequency adjustment quantity is as follows:
wherein (1)>An amount of adjustment for the frequency; v bus For the output voltage; k is a feedforward proportional coefficient of the output voltage; g BPF (s) is a characteristic frequency of 2f 0 Is a second order bandpass filter transfer function, f 0 Fundamental frequency of voltage and current output by the rear-stage inversion module;
superposing the resonant frequency and the frequency adjustment amount to obtain a target working frequency;
and controlling the resonant conversion module to work at the target working frequency so as to adjust the output impedance of the resonant conversion module at the frequency doubling position, and further inhibiting the ripple current at the frequency doubling position.
2. The method of claim 1, wherein the characteristic frequency is 2f 0 The transfer function of the second order band pass filter of (2) is:
wherein (1)>For damping coefficient omega 0 Is the angular frequency of the second harmonic.
3. The method according to claim 1, wherein the superimposing the resonance frequency and the frequency adjustment amount to obtain a target operating frequency includes:
and taking the superposition result of the resonant frequency and the frequency adjustment amount as the target working frequency, and controlling the difference value between the target working frequency and the resonant frequency to be in a target range.
4. The method of claim 3, wherein the target operating frequency is expressed as:
wherein f r For the resonance frequency, +.>The limit value is adjusted for the target.
5. The method of claim 1, wherein the output impedance calculation formula of the resonant transformation module is:
；
wherein Z(s) is the output impedance, Z LLC (s) is the output impedance of the resonant conversion module when working at the resonant frequency, K is the feedforward scaling factor of the output voltage amplified in the scaling link; g BPF (s) is a characteristic frequency of 2f 0 A transfer function of a second order bandpass filter of (a); f (f) 0 Fundamental frequency of voltage and current output by the rear-stage inversion module; c (C) bus And the capacitance value of the bus capacitor.
6. A double frequency ripple current control device, the device comprising:
the detection module is used for acquiring the output voltage of the bus capacitor and the resonance frequency of the resonance conversion module;
the first signal processing module is used for amplifying the output voltage according to a preset feedforward proportional coefficient; filtering the amplified output voltage through a second-order band-pass filter to obtain a frequency adjustment quantity; the formula for obtaining the frequency adjustment quantity is as follows:
wherein (1)>An amount of adjustment for the frequency; v bus For the output voltage; k is a feedforward proportional coefficient of the output voltage; g BPF (s) is a characteristic frequency of 2f 0 Is a second order bandpass filter transfer function, f 0 Fundamental wave frequency of voltage and current output by the back-stage inversion module;
the second signal processing module is used for carrying out superposition processing on the resonant frequency and the frequency adjustment quantity so as to obtain a target working frequency;
and the adjusting module is used for controlling the resonant conversion module to work at the target working frequency so as to adjust the output impedance of the resonant conversion module at the frequency doubling position and further inhibit the ripple current at the frequency doubling position.
7. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the double frequency ripple current control method of any one of claims 1 to 5 when the computer program is executed.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the double frequency ripple current control method of any one of claims 1 to 5.
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