EP4352870A1 - Convertisseur de puissance à variation de fréquence porteuse dynamique - Google Patents

Convertisseur de puissance à variation de fréquence porteuse dynamique

Info

Publication number
EP4352870A1
EP4352870A1 EP22726437.1A EP22726437A EP4352870A1 EP 4352870 A1 EP4352870 A1 EP 4352870A1 EP 22726437 A EP22726437 A EP 22726437A EP 4352870 A1 EP4352870 A1 EP 4352870A1
Authority
EP
European Patent Office
Prior art keywords
frequency
predetermined
control device
power converter
frequency range
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22726437.1A
Other languages
German (de)
English (en)
Inventor
Helge SPRENGER
Dennis BURGER
Thomas ZELTWANGER
Christian Weber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP4352870A1 publication Critical patent/EP4352870A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac 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
    • H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • 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
    • H02M1/15—Arrangements for reducing ripples from dc input or output using active elements
    • 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
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters

Definitions

  • the present invention relates to a control device for an electric power converter and an electric power converter with such a control device.
  • the present invention also relates to a method for controlling an electrical power converter.
  • a so-called pulse width modulation can be used to operate induction machines, such as those used, for example, in electric drive systems for electrically driven vehicles.
  • pulse-width-modulated control signals can be fed to the switching elements of an electrical power converter in order to open or close these switching elements.
  • a predefined output voltage or a predefined output current can be set at the converter by the pulse width modulated activation of the individual switching elements.
  • the publication DE 10 2018204221 A1 describes a method for controlling a pulse width modulated power converter.
  • it is proposed to subdivide a PWM raster into two sub-intervals and to carry out a separate calculation of a space vector vector for each sub-interval of the PWM raster, on which the activation of the switching elements of the power converter is based.
  • the present invention creates a control device for an electric power converter, an electric power converter and a method for controlling an electric power converter with the features of the independent patent claims. Further advantageous embodiments are the subject matter of the dependent patent claims. Accordingly, it is provided:
  • a control device for an electrical power converter with a signal generating device and a control device The signal generating device is designed to receive an input parameter. Furthermore, the signal generation device is designed to generate switching signals using the received input parameter. The generated switching signals can be provided to switching elements of the inverter. In this case, the switching signals have a predetermined modulation frequency.
  • the control device is designed to set the specified modulation frequency in the signal generation device. In particular, the control device is designed to set a frequency as the modulation frequency that varies in a predetermined frequency range and with a predetermined pattern around a fundamental frequency. The frequency range and/or the pattern for the variation of the modulation frequency can be adjustable.
  • An electrical power converter with a control device according to the invention and a plurality of switching elements The multiple switching elements are opened and closed using the switching signals generated by the control device.
  • a method of driving an electrical power converter includes a step of setting a modulation frequency.
  • the set modulation frequency has a frequency that varies in a predetermined frequency range and with a predetermined pattern around a predetermined fundamental frequency.
  • the method also includes a step for generating switching signals for the power converter. The switching signals are generated in particular using the set modulation frequency and a received input parameter.
  • the present invention is based on the knowledge that with a frequency-modulated control of the switching elements of an electrical power converter, in particular with a pulse-width modulated control of the power converter, different advantages and disadvantages can arise depending on the selected modulation frequency.
  • the present invention is also based on the finding that when the electric power converter is driven with a constant modulation frequency over a longer period of time, these effects and in particular the resulting disadvantages are more noticeable.
  • noise development or voltage ripples in the electrical system can be taken into account.
  • limit values or specifications with regard to electromagnetic emissions, noise behavior, voltage ripples, etc. can be more easily complied with.
  • further components for minimizing the negative influences mentioned can be dimensioned smaller or possibly even be omitted completely.
  • the frequency whose period duration corresponds, for example, to a PWM interval is regarded as the modulation frequency.
  • a switching process for opening the switching element and a switching process for closing the switching element take place in each switching element of the voltage converter. If necessary, by deliberately shifting the switch-on time intervals and/or switch-off time intervals two consecutive switch-on or switch-off processes can be combined.
  • the switching operations of the corresponding switching element result in a switching frequency which is half the modulation frequency. Otherwise, the switching frequency of the switching elements in the voltage converter corresponds to the modulation frequency.
  • the setting of the modulation frequency and in particular the frequency range and the variation pattern for the respective operating state can be selected in such a way that the critical parameter in particular is minimized.
  • additional components such as the dimensioning of an intermediate circuit capacitor in the voltage converter, electromagnetic filters for reducing electromagnetic interference, etc., can be dimensioned smaller. In this way, both the installation space can be reduced and the costs required for the production of the entire system can be lowered.
  • the control device of the control device is designed to set the fundamental frequency within a predefined range for the fundamental frequency.
  • the control device can adapt the fundamental frequency for the modulation of the control signals.
  • the basic frequency for the modulation can be adjusted as a function of the rotational frequency of an electric machine and/or other operating parameters.
  • a variation of the modulation frequency for the electric power converter in such a system is possible in a range between 2 kHz and 20 kHz.
  • any other control ranges can also be selected for the selection of the basic frequency.
  • the control device is designed to adapt the predetermined frequency range for the variation of the modulation frequency around the fundamental frequency as a function of the fundamental frequency set.
  • the control device can also adapt the predetermined pattern for the variation of the modulation frequency as a function of the set fundamental frequency. Since there are different effects and interferences depending on the fundamental frequency selected for the electric power converter and the connected components, it is possible to target one or more of these effects by adjusting the frequency range in which the modulation frequency is varied and the pattern used for the variation of the modulation frequency be influenced. If, for example, a particularly strong electromagnetic influence is to be expected for a selected basic frequency, the frequency range and the pattern for the variation of the modulation frequency can be selected in such a way that the electromagnetic influences in particular are minimized.
  • the predetermined pattern with which the modulation frequency can be varied around the fundamental frequency comprises a plurality of predetermined frequencies.
  • the multiple frequencies may be within the specified frequency range.
  • the change between the individual specified frequencies can take place according to a specified statistical distribution.
  • the change between the individual frequencies can be equally distributed.
  • Other statistical distributions, such as a Gaussian distribution or the like are also possible.
  • multiple frequencies can be selected within the specified frequency range, which are distributed equidistantly within the specified frequency range. In principle, any number of several predefined frequencies can be selected within the frequency range.
  • two frequencies for example the two frequencies at the edge of the frequency range around the fundamental frequency
  • three frequencies for example, the two outer frequencies of the frequency range and the fundamental frequency itself can be selected.
  • four or more frequencies can of course also be selected within the specified frequency range, which are selected according to a predetermined rule in order to determine and adjust the respective modulation frequency.
  • the control device is designed to adapt the predetermined frequency range as a function of electromagnetic interference caused by the power converter or components connected to the power converter.
  • the predetermined pattern with which the frequencies are varied within the predetermined frequency range can also be adapted as a function of the electromagnetic interference caused or expected. If, for example, a particularly strong electromagnetic interference is to be expected at a set fundamental frequency or a certain operating mode of a system with the power converter, the occurrence or the Intensity and the frequency spectrum of electromagnetic interference can be counteracted. In this way, the electromagnetic compatibility of the overall system can be increased.
  • filter devices for suppressing electromagnetic interference can also be dimensioned smaller if the occurrence of electromagnetic interference can already be reduced by appropriate adjustment of the frequency range and/or the pattern for changing the modulation frequency.
  • the control device is designed to adapt the predetermined frequency range as a function of the noise generated by the power converter and/or a component controlled by the power converter.
  • the pattern for changing the modulation frequency within the specified frequency range can be adapted as a function of a predicted or measured noise development. Due to the variation in the modulation frequency, the switching elements in the power converter are not driven continuously at a fixed frequency.
  • a variation of the modulation frequency within a frequency range in particular in the case of a pattern that is particularly suitable for this purpose, can counteract a noise development perceived as annoying by a user.
  • the frequency range and/or the pattern for the variation of the modulation frequency can be adjusted depending on the fundamental frequency.
  • other parameters such as an operating state of the power converter or the like, can also be adjusted for setting the frequency range or the pattern for varying the modulation frequency.
  • the noise development can be deliberately increased when driving slowly in order to increase the attention of passers-by in the vicinity of the electric vehicle.
  • the control device is designed to set the predetermined frequency range as a function of a voltage ripple in the intermediate circuit of the power converter.
  • the pattern for the variation of the modulation frequency within the frequency range can also be adapted as a function of the voltage ripple in the intermediate circuit of the power converter.
  • the intensity of voltage ripples can be reduced by a corresponding variation of the modulation frequency within a suitable frequency range and with a suitable pattern, particularly in operating states which can cause increased voltage ripples.
  • additional measures to protect the intermediate circuit capacitor and other components can possibly be omitted or at least be dimensioned smaller. Since the voltage ripple can also have an influence on the noise development during operation of the system, it is also possible to optimize the noise development through targeted adjustment of the voltage ripple.
  • the control device is designed to set the predetermined frequency range as a function of an electrical current in the intermediate circuit of the power converter.
  • the predetermined pattern for the variation of the modulation frequency in the predetermined frequency range can also be adapted as a function of an electrical current in the intermediate circuit.
  • the electrical current can, for example, be measured or, if necessary, also be calculated.
  • these parameters can also be adjusted depending on other factors, such as a torque to be set in an electric drive system or a speed. In this case too, sensor-detected values, predicted values or target values can be used as a basis for adjusting the frequency range and/or the pattern.
  • FIG. 1 shows a schematic representation of a block diagram of an electric drive system with a power converter, which includes a control device according to an embodiment
  • Fig. 2 a schematic representation of a timing diagram for
  • Fig. 3 a schematic representation of a diagram for
  • FIG. 1 shows a schematic representation of a block diagram of an electric drive system with an electric power converter 1.
  • the power converter 1 can be an inverter, for example, which converts an input DC voltage into a single-phase or multi-phase electric AC voltage and makes this available at the output.
  • a DC voltage source 2 for example a traction battery of an electric vehicle or the like, can be connected to the input of the converter 1, for example.
  • an electrical machine 3 can be connected to the output of the power converter 1 .
  • the embodiment shown in the embodiment shown here with a three-phase electrical machine 3 serves only as an example to explain the basic principle and does not represent a limitation of the present invention.
  • an electrical machine 3 with any number of electrical Phases are connected to a corresponding converter 1.
  • any other electrical power converter 1 for example a DC voltage converter or the like, is also possible.
  • An intermediate circuit capacitor C for example, can be provided in the DC voltage intermediate circuit of the converter 1 .
  • the power converter 1 can include a plurality of switching elements M1 to M6.
  • the switching elements M1 to M6 In the case of a three-phase inverter, for example, three half-bridges, each with two switching elements Mi, can be combined to form a so-called B6 bridge.
  • the switching elements Mi of the power converter 1 can be controlled, for example, each with a predetermined modulation frequency.
  • a pulse width modulation (PWM) modulation can be used to drive the individual switching elements Mi.
  • the period duration of the modulation frequency corresponds to a PWM period.
  • a control device 10 is provided for controlling the individual switching elements Mi of the power converter 1 .
  • This control device 10 can receive one or more target values S, for example. On the basis of these target values S, the control device 10 for each of the switching elements Mi generate a pulse width modulated drive signal and provide it to the respective switching element Mi.
  • the underlying modulation frequency can be varied to generate the drive signals.
  • a basic frequency can first be specified or determined.
  • the fundamental frequency can vary in the range between 2 kHz and 20 kHz, for example.
  • the fundamental frequency can be set as a function of the speed of the electrical machine 3 which is connected to the power converter 1 .
  • a first fundamental frequency can be specified at low rotational frequencies, and a further fundamental frequency that deviates from this can be selected at higher rotational frequencies.
  • any other specifications for the selection and setting of the basic frequency for the modulation of the control signals for controlling the switching elements Mi are also fundamentally possible.
  • the control device 10 can generate the control signals for the individual switching elements Mi using this fundamental frequency.
  • the modulation frequency for generating the drive signals can be varied in a predetermined frequency range around the fundamental frequency.
  • the control signals for the switching elements Mi are not modulated continuously with a constant, fixed modulation frequency, but are varied within the specified frequency range around the fundamental frequency in accordance with a specified specification.
  • the control device 10 can, for example, comprise a control device 12, which sets the modulation frequency for generating the control signals for controlling the switching elements Mi accordingly.
  • a basic frequency can first be specified on the control device 12 .
  • the fundamental frequency can be provided by a higher-level device on the control device 12, for example.
  • the control device 12 can then determine a modulation frequency and provide the modulation frequency to the signal generating device 11 .
  • the Signal generating device 11 can then generate control signals for the individual switching elements Mi for the individual switching elements Mi of the power converter 1 according to the modulation frequency of the control device 12 and provide them to the switching elements Mi.
  • a desired value or several desired values can be specified at the signal generating device 11 .
  • the signal generating device 11 can, for example, generate pulse width modulated drive signals for the individual switching elements Mi and provide them to the switching elements Mi.
  • the period of the grid for the pulse width modulated control corresponds to the period of the modulation frequency provided by the control device 12 .
  • the control device 12 can vary the modulation frequency on the basis of the predetermined fundamental frequency within a frequency range.
  • the modulation frequency is varied by the control device 12 within predetermined limits.
  • the frequency range within which the modulation frequency is varied around the fundamental frequency, as well as the pattern with which the modulation frequency is varied around the fundamental frequency, can be adjusted.
  • the frequency range and the pattern for the variation of the modulation frequency can be adjusted depending on other parameters, such as the operating state of the drive system, in particular the power converter 1 or other components in connection with the power converter 1, sensor-detected values, specified setpoints or calculated parameters.
  • other framework conditions such as specifications, limit values, etc. for the power converter 1 and components connected to the power converter 1 can also be taken into account.
  • the frequency range and/or the pattern for the variation of the modulation frequency can be adjusted in order to minimize interference signals, such as electromagnetic interference, to influence the noise development within the converter or components connected to the converter, or also voltage curves, For example, to limit voltage ripples in the intermediate circuit of the converter 1.
  • Figure 2 shows a schematic representation of the profile of a control signal for controlling a switching element Mi of an electrical power converter 1.
  • the switching element Mi is switched on and off once within each time frame.
  • the durations of the individual time frames t_i are not all the same. Rather, the duration of the individual time grids or PWM grids can vary within predetermined limits.
  • the duration of a PWM raster corresponds to the period duration of the underlying modulation frequency.
  • the width tj of a PWM raster varies with the variation of the underlying modulation frequency.
  • the frequency range within which the modulation frequency is varied and the pattern with which the modulation frequency is varied within the predetermined frequency range can be changed.
  • the frequency range within which the modulation frequency is varied can be specified as a function of the fundamental frequency on which it is based.
  • the frequency range over which the modulation frequency is varied around the fundamental frequency can be characterized as a fraction of the underlying fundamental frequency.
  • the modulation frequency can be varied in a range of 20% of the fundamental frequency around the fundamental frequency.
  • This relative frequency range, in which the modulation frequency can be varied around the basic frequency can be made dependent on other parameters in particular. For example, depending on one or more other parameters, the frequency range can be varied between 0 and 20% of the fundamental frequency around the fundamental frequency.
  • the frequency range can also be adjusted depending on the given fundamental frequency. Any function can be specified for this purpose, which supplies the basic frequency as an input value and the absolute or relative frequency range for the modulation frequency as an output value.
  • the interference signals emanating from the converter 1 and the components connected to the converter 1, such as, for example electromagnetic emissions can fluctuate depending on the modulation frequency and thus the fundamental frequency
  • the emitted interference signals and thus the electromagnetic influence can be influenced, for example, by dynamic adjustment of the frequency range or the pattern for changing the modulation frequency within the frequency range, which is explained in more detail below .
  • the frequency range and/or the pattern for the variation of the modulation frequency can be adapted, for example, in the case of particularly critical fundamental or modulation frequencies, in order to minimize the interference signals that arise.
  • negative influences from other factors, such as noise development or the like can also be deliberately accepted.
  • interference noises which are caused, for example, by the switching elements Mi of the voltage converter 1 or components connected to the voltage converter 1, such as an electrical machine or the like, can be influenced by adjusting the variation of the modulation frequency.
  • the noise development can be subjectively improved by widening the frequency range in which the modulation frequency is varied.
  • a subjective perception of the noises produced can also be influenced by changing the pattern with which the frequency is varied within the frequency range.
  • the occurrence of voltage ripples in the intermediate circuit or similar interference pulses within the power converter 1 can also be influenced by a targeted adjustment of the variation of the modulation frequency.
  • voltage ripples in the intermediate circuit of the power converter 1 can be detected by sensors or estimated on the basis of a computer model. If critical voltage ripples are to be expected, for example voltage ripples above a specified threshold value, the magnitude of the voltage ripples that occur can be minimized by adjusting the frequency range in which the modulation frequency is varied or by selecting a suitable pattern for the variation of the modulation frequency will. For example, the voltage ripple that occurs can be reduced by changing the frequency range in which the modulation frequency is varied.
  • a current within the power converter 1 in particular, for example, a phase current from the output of the power converter 1 in the direction of an electrical machine 3 or the like, can also be used as a basis for adjusting the frequency range and/or the pattern for the variation of the Modulation frequency are used.
  • measured electrical currents, calculated electrical currents based on other parameters or setpoint specifications can be used as a basis for adapting the frequency range and/or the pattern for the variation of the modulation frequency.
  • any other parameters such as a rotational frequency, a torque to be set or the like on an electrical machine 3 connected to the converter 1, can of course also be used as a basis for setting the frequency range and/or pattern for the variation of the modulation frequency .
  • measured values, calculated values or target values can be used as a basis for dynamically adapting the frequency range or pattern.
  • any suitable model or scheme can be used to vary the modulation frequency within the predefined frequency range around the fundamental frequency.
  • the modulation frequency can be increased continuously from a lower value of the frequency range to an upper value of the frequency range within a specified time window or with a specified increment.
  • a continuous reduction from an upper frequency value to a lower frequency value is also possible. It is also possible to alternately increase and decrease the modulation frequency within the specified frequency range.
  • two or more fixed frequency values within the specified frequency range and to select the specified frequency values within the frequency range according to a specified model or scheme. For example, for a binary model, two frequency values, specifically the lower one value of the frequency range and the upper value of the frequency range can be selected. These two values can then be selected randomly or pseudo-randomly for the modulation frequency.
  • predetermined sequences in particular previously defined sequences stored in a memory, for the selection of the respective frequency as the modulation frequency are also possible.
  • the previously described binary scheme for changing the modulation frequency can be implemented particularly easily and with little computing power.
  • patterns with more than two fixed frequencies are also possible.
  • the fundamental frequency which is usually in the middle, can also be specified as an additional frequency component for the selection of the modulation frequency.
  • a number of frequencies can be selected within the predefined frequency range in accordance with a predefined pattern.
  • multiple equidistant frequencies can be selected within the specified frequency range.
  • one of the predetermined frequencies can be selected as the modulation frequency according to a predetermined scheme, randomly, pseudo-randomly, or according to a previously stored sequence.
  • any suitable stochastic distribution can be used as a basis for the selection of the modulation frequency from the plurality of predefined frequencies.
  • the individual predetermined frequencies within the predetermined frequency range can be selected according to a uniform distribution, a Gaussian distribution, or the like.
  • complex sequences such as random or pseudo-random selection of the frequency components can lead to at least approximately white noise. This can have an advantageous effect on at least some of the aforementioned properties, such as noise emissions or electromagnetic interference signals.
  • the aforementioned parameters can be adjusted depending on the objective, such as noise emission, reduction of electromagnetic interference signals, reduction the voltage ripple in the DC link etc. can be set as desired.
  • a frequency range and/or pattern for the variation of the modulation frequency can also be deliberately selected, which could be disadvantageous for the other, possibly currently non-critical parameters.
  • One or more particularly critical parameters can thus be positively influenced in each case by dynamically adapting the frequency range and/or pattern for the variation of the modulation frequency.
  • the design of the system and in particular the components for filtering or suppressing the negative or critical properties can be dimensioned smaller.
  • FIG. 3 shows a diagram of a possible configuration for setting the frequency range Af as a function of the fundamental frequency f and the selection of a corresponding pattern for the variation of the modulation frequency.
  • This example is only intended to illustrate one possibility as an example and does not represent a limitation of the present invention. Rather, any other selection of frequency ranges and patterns for the variation of the modulation frequency is also possible.
  • the fundamental frequency f is plotted in the horizontal direction.
  • the power converter 1 can be operated with a fundamental frequency between a lower frequency f1 and an upper frequency f2.
  • a power converter can be operated in a range of the fundamental frequency between 2 kHz and 20 kHz.
  • the basic frequency f for the power converter 1 can be defined or adjusted according to any specifications, for example as a function of a rotational frequency of a connected electric motor or the like.
  • the modulation frequency can be varied by about 10% around the set basic frequency f1.
  • the size of the frequency range Af, within which the modulation frequency is varied around the fundamental frequency decreases continuously up to a value f0 in the example shown here.
  • a first pattern for varying the modulation frequency is used in the range PI between the frequency f1 and the frequency f0. For example, a binary change between two given frequencies within the predetermined frequency range Af. For example, with a statistical uniform distribution, you can switch between two frequency values at random.
  • a further or second pattern can be used for varying the modulation frequency.
  • more than two fixed frequencies within the predetermined frequency range Af can be selected, which are selected, for example, with a statistical Gaussian distribution within the predetermined frequency range Af.
  • any patterns other than the above-mentioned variation options for varying the modulation frequency around the fundamental frequency are also possible.
  • the size of the frequency range Af, within which the modulation frequency is varied around the fundamental frequency f increases as the fundamental frequency f increases.
  • the size of the frequency range Af can be set to zero, ie there is no variation in the modulation frequency at all, but the fundamental frequency fO is continuously used as the modulation frequency. If, on the other hand, the frequency f2 is set as the fundamental frequency, the modulation frequency can be varied within the frequency range Af in the range of ⁇ 20% around the fundamental frequency f2.
  • any other schemes and numbers for defining the frequency ranges and selecting the pattern for varying the modulation frequency are of course also possible.
  • the frequency range with which the modulation frequency is varied around the fundamental frequency can also remain constant over a range of the fundamental frequency.
  • both the frequency range and the pattern for the variation of the modulation frequency can also be selected and adjusted as a function of any other parameters. In this way, individual properties of the power converter 1 or components connected to the power converter 1 can be influenced in a targeted manner.
  • a first pattern for varying the modulation frequency is particularly preferably used in the range PI with the lower fundamental frequencies between the frequency f1 and the frequency f0. This counteracts the dominant background noise, particularly in this range of the fundamental frequency. In the case of basic frequencies, which are in a frequency range that is particularly sensitive for humans, the noise development is subjectively improved by widening the frequency range in which the modulation frequency is varied.
  • a subjective perception of the noises produced can also be influenced by changing the pattern with which the frequency is varied within the frequency range.
  • a second pattern P2 for the variation of the modulation frequency is particularly preferably used in the area P2 with the higher fundamental frequencies between f0 and f2.
  • the dynamic adjustment of the frequency range and the pattern for the variation of the modulation frequency primarily serves to reduce the EMC emissions that are dominant in this range.
  • the design of the system and in particular the components for filtering or suppressing the negative or critical properties can be dimensioned smaller.
  • FIG. 4 shows a schematic illustration of a flowchart on which a method for controlling an electrical power converter according to one specific embodiment is based.
  • a modulation frequency is set in step S1.
  • the set modulation frequency can in particular have a frequency which is varied in a predetermined frequency range. Furthermore, the modulation frequency can be varied in a predetermined pattern around the predetermined fundamental frequency.
  • step S2 switching signals for an electrical power converter are generated.
  • the switching signals are generated using the set modulation frequency.
  • a received input parameter for example a desired value for a current, a torque or a speed of a connected electric motor, can be generated for the generation of the switching signals.
  • the present invention relates to driving an electrical power converter.
  • the power converter is controlled with a specified modulation frequency.
  • This modulation frequency can be variable to be set.
  • the modulation frequency can be varied around a fundamental frequency in a predetermined frequency range.
  • the frequency range in which the modulation frequency is varied and also the pattern in which this variation occurs can be adjusted.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

La présente invention concerne la commande d'un convertisseur de puissance électrique. Le convertisseur de puissance est commandé avec une fréquence de modulation prédéfinie. Cette fréquence de modulation peut être ajustée de manière variable. En particulier, la fréquence de modulation peut varier autour d'une fréquence de base dans une plage de fréquences prédéfinie. La plage de fréquences, dans laquelle la fréquence de modulation est modifiée, ainsi que le motif, avec lequel cette variation se produit, peuvent être ajustés.
EP22726437.1A 2021-06-11 2022-04-29 Convertisseur de puissance à variation de fréquence porteuse dynamique Pending EP4352870A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021205968.6A DE102021205968A1 (de) 2021-06-11 2021-06-11 Ansteuervorrichtung für einen elektrischen Stromrichter, elektrischer Stromrichter sowie Verfahren zum Ansteuern eines elektrischen Stromrichters
PCT/EP2022/061443 WO2022258256A1 (fr) 2021-06-11 2022-04-29 Convertisseur de puissance à variation de fréquence porteuse dynamique

Publications (1)

Publication Number Publication Date
EP4352870A1 true EP4352870A1 (fr) 2024-04-17

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EP22726437.1A Pending EP4352870A1 (fr) 2021-06-11 2022-04-29 Convertisseur de puissance à variation de fréquence porteuse dynamique

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EP (1) EP4352870A1 (fr)
CN (1) CN117480720A (fr)
DE (1) DE102021205968A1 (fr)
WO (1) WO2022258256A1 (fr)

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DE102021205968A1 (de) 2022-12-15
WO2022258256A1 (fr) 2022-12-15

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