EP3449565A1 - Procédé pour sélectionner un convertisseur de fréquence pour une unité à compresseur frigorifique - Google Patents

Procédé pour sélectionner un convertisseur de fréquence pour une unité à compresseur frigorifique

Info

Publication number
EP3449565A1
EP3449565A1 EP16718356.5A EP16718356A EP3449565A1 EP 3449565 A1 EP3449565 A1 EP 3449565A1 EP 16718356 A EP16718356 A EP 16718356A EP 3449565 A1 EP3449565 A1 EP 3449565A1
Authority
EP
European Patent Office
Prior art keywords
frequency
current value
operating
frequency converter
data processing
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
EP16718356.5A
Other languages
German (de)
English (en)
Inventor
John Gibson
Tobias HIEBLE
Julian Pfaffl
Jürgen NILL
Ferdinand BREITHUTH
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.)
Bitzer Kuehlmaschinenbau GmbH and Co KG
Original Assignee
Bitzer Kuehlmaschinenbau GmbH and Co KG
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 Bitzer Kuehlmaschinenbau GmbH and Co KG filed Critical Bitzer Kuehlmaschinenbau GmbH and Co KG
Priority to EP23192737.7A priority Critical patent/EP4254780A3/fr
Publication of EP3449565A1 publication Critical patent/EP3449565A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/047—V/F converter, wherein the voltage is controlled proportionally with the frequency
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
    • H02P2201/01—AC-AC converter stage controlled to provide a defined AC voltage
    • 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
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the invention relates to a method for selecting a frequency converter for a refrigerant compressor unit, comprising a refrigerant compressor and an electric drive motor.
  • the frequency inverters have always been selected for the refrigerant compressor units in such a way that the frequency converter does not limit the possible working conditions of the refrigerant compressor.
  • the invention is therefore based on the object to improve a method for selecting a frequency converter to the effect that the frequency converter is selected application optimized.
  • Operation diagram of the refrigerant compressor is selected that an operating frequency is selected for this selected operating state and that from drive data a the selected working state and the
  • Frequency converter is available, which allows a simple determination of the frequency converter, for example, in such a way that the frequency converter to be selected must be at least able to produce a current corresponding to the Hässtands sunnysstromwert current at the output.
  • the drive data are determined in advance, in particular also dependent on the refrigerant, and in particular stored for later use in the selection of the frequency converter.
  • the frequency converter can be selected particularly easily if, on the basis of the operating state operating current value from data of available frequency converters, that frequency converter whose maximum value of the converter current is equal to or greater than the operating state operating current value is selected.
  • the data of the eligible frequency converter are summarized in a list, which is available in particular as a stored file.
  • Inverter maximum current value is as close as possible to the working state operating current value.
  • the frequency converter is selected so that its converter startup maximum current value is equal to or greater than a startup current value of the refrigerant compressor unit.
  • this is for the selection of the frequency converter
  • an advantageous solution provides that the starting current value is determined experimentally and in particular stored thereafter in order to be available for the selection of the frequency converter.
  • the starting current value corresponds to the real conditions of the refrigerant compressor unit.
  • the frequency converter it is preferably provided that the
  • Frequency converter is selected so that its Umrichteranlaufmaximal- current value is as close to the starting current value, so that in this respect no unnecessarily large dimensioning of the frequency with respect to the inverter maximum current value takes place.
  • the frequency converter prefferably be selected such that its maximum converter current value is as close as possible to the higher of the values for the operating state operating current value and starting current value, thereby optimizing the design of the frequency converter with regard to its maximum converter current value to the selected operating state.
  • an advantageous solution provides that for each operating state of the refrigerant compressor unit experimental drive data for the possible operating frequencies to be selected are stored.
  • the operating frequency to be selected is in the range from 0 hertz to 140 hertz.
  • the operating frequency to be selected will be in the range of from a corner frequency of the frequency converter to a frequency of 140 hertz, preferably up to 90 hertz.
  • an approach that is easy to implement provides that the drive data have the experimentally determined electrical power consumption for each working state in the field of use at the various operating frequencies.
  • the arithmetic determination of the working state operating current value is effected, in particular, by taking into account the impedance of the equivalent circuit diagram of the drive motor for determining the operating state operating current value.
  • the experimentally determined power consumption of the refrigerant compressor unit is equated with the power consumption resulting from the equivalent circuit diagram to determine the operating state current value and the slip is determined therefrom so that all parameters for the complete calculation of the operating state operating current value are present.
  • the operating state operating current value can be determined.
  • the experimentally determined stored drive data no further specific information has been provided so far.
  • an advantageous solution provides that the experimentally determined electrical power consumption of each working state in the field of application is recorded at the respective operating frequency, in particular stored.
  • Another advantageous solution provides that the working state operating current values calculated from the experimentally determined power consumption for the respective working state and the respective operating frequency are recorded, in particular stored.
  • the method according to the invention for selecting a frequency converter restricts the operating states of the refrigerant compressor available in the field of use of the application diagram, it is preferably provided that the operating state of the selected one is selected on the basis of the maximum converter current value
  • Inverters determine the operating states associated with this maximum inverter current value in the field of use at a selected operating frequency based on the drive data.
  • This determination of the operating states on the basis of the inverter maximum current value determined after the selection of the frequency converter has the great advantage that it can be used to determine the restrictions of the field of use and the operating states that can be realized in the field of application due to the selection of the frequency converter according to the invention.
  • the operating states determined for the converter maximum current value are displayed visually in the application diagram.
  • a customary visualization unit is provided for this purpose, which on the one hand represents the deployment diagram and, on the other hand, the working states which form a boundary of the deployment field in the deployment diagram.
  • operating states may occur in which the operating state operating current value exceeds the maximum inverter current value at high operating frequencies.
  • the method provides that only frequency inverters are provided for selection, which comprise a frequency limiting unit which limits the operating frequency at operating frequencies above a cutoff frequency such that the converter maximum current value of the frequency converter is not exceeded.
  • Such a frequency limiting unit thus has the advantage that, in spite of the selection of the frequency converter according to the invention, operating states of the refrigerant compressor unit are permitted, but not as a whole
  • Frequency range in particular not at above the corner frequency operating frequencies, can be realized, however, that in realizing such operating states of the frequency converter itself limits the operating frequency such that no transition to the fault mode takes place.
  • the operating state operating current value of the frequency converter is constantly detected by the frequency limiting unit.
  • the operating state current value of the frequency converter to be compared with a current reference value and for the operating frequency to be limited to a cutoff frequency which is present when the current reference value is reached.
  • the current reference value is in the simplest case directly the inverter maximum current value.
  • the frequency limiting unit takes into account both the inverter maximum current value and the compressor maximum operating current value as the current reference value and determines the cutoff frequency on the basis of the lowest of the maximum current values.
  • a voltage increase unit causes an increase in the output voltage over the operating frequency independently of a fluctuation of a mains voltage.
  • This solution has the advantage that the selected frequency converter, even with fluctuating mains voltage, in particular fluctuations by up to 20%, does not change the increase of the output voltage of the frequency converter substantially above the operating frequency for the flow in the drive motor of the refrigerant compressor unit, but keeps this increase constant. This is done in particular by measuring an intermediate circuit voltage of the frequency converter and by comparing it with at least one reference value to correct a voltage profile of the output voltage of the frequency converter in order to keep the rise of the output voltage constant above the operating frequency.
  • the intermediate circuit voltage represents a favorable for the inventive method voltage, since this is proportional to the mains voltage and thus also the fluctuations of the mains voltage
  • the invention relates to a data processing unit according to the features of claims 28 to 54, wherein with regard to the advantages thereof reference is made to the corresponding explanations concerning the method according to the invention.
  • the invention relates to a refrigerant compressor unit comprising a refrigerant compressor and an electric drive motor and comprising a frequency converter for operating the electric drive motor, independently of the solutions described above, or in combination with these, and the frequency converter comprises a frequency limiting unit, which at operating frequencies above a corner frequency limits the operating frequency such that the inverter maximum current value of the frequency converter is not exceeded.
  • Such a frequency limiting unit thus has the advantage that in this operation even without special intervention operation of the refrigerant compressor plant at working conditions of the refrigerant compressor unit is possible, not in the entire frequency range, especially not all over the Corner frequency lying operating frequencies, with the available inverter maximum operating current, can be realized because when realizing such operating states of the frequency converter itself limits the operating frequency such that no transition to the fault mode takes place.
  • the operating state operating current value of the frequency converter is constantly detected by the frequency limiting unit.
  • the operating state current value of the frequency converter to be compared with a current reference value and for the operating frequency to be limited to a cutoff frequency which is present when the current reference value is reached.
  • the current reference value is in the simplest case directly the inverter maximum current value.
  • the frequency limiting unit takes into account both the inverter maximum current value and the compressor maximum operating current value as the current reference value and determines the cutoff frequency on the basis of the lowest of the maximum current values.
  • the invention further relates, independently of the solutions described above, or in combination with these, a refrigerant compressor system comprising a refrigerant compressor unit with a
  • Refrigerant compressor and an electric drive motor comprising a frequency converter for operating the electric drive motor, wherein the frequency converter comprises a voltage adjustment unit which controls an increase in the output voltage above the operating frequency so that it is independent of a fluctuation of a mains voltage.
  • This solution has the advantage that the selected frequency converter, even with fluctuating mains voltage, in particular fluctuations by up to 20%, does not change the increase of the output voltage of the frequency converter substantially above the operating frequency for the flow in the drive motor of the refrigerant compressor unit, but keeps this increase constant.
  • the voltage adaptation unit detecting an intermediate circuit voltage of the frequency converter and correcting the increase of the output voltage of the frequency converter for deviations from the at least one reference value by comparison with at least one reference value in order to keep the rise in the output voltage constant above the operating frequency.
  • the intermediate circuit voltage represents a favorable for the inventive method voltage, since this is proportional to the mains voltage and thus also the fluctuations of the mains voltage
  • the reference values used by the voltage adjustment unit comprise at least one of the values such as: a reference frequency, a proportionality factor and a DC link voltage setpoint.
  • Voltage control signal generated in addition to the frequency request signal of an inverter stage control of an inverter stage of the frequency converter is supplied and that the voltage adjustment unit with the frequency converter control for controlling the increase of the output voltage over the operating frequency cooperates.
  • the frequency converter controller has a proportional element which, on the basis of the frequency request signal of the
  • Voltage control signal generates the voltage control signal and that the voltage adjustment unit corrects a proportional behavior of the proportional element.
  • the proportionality correction factor is used to correct the proportional behavior of the proportional element.
  • FIG. 2 is a schematic representation of a deployment diagram of the refrigerant compressor unit with an insert field enclosed by an insert boundary, which defines the permitted operating states of the refrigerant compressor unit;
  • Fig. 3 is a representation of a curve of an output voltage of
  • Frequency converter over an operating frequency and a course of a working state operating current value above the operating frequency
  • FIG. 4 shows a schematic illustration of a data processing unit for optimum selection of a frequency converter according to a first exemplary embodiment of the solution according to the invention
  • Fig. 5 is an illustration of an equivalent circuit diagram of a drive motor of
  • a refrigerant compressor unit showing the equations for a motor impedance, an electric power consumption and a working state operating current value at a certain operating frequency; a schematic representation of a method according to the invention for determining limitations of the application field due to the selection of the frequency converter according to the invention according to the first embodiment; 7 is a schematic representation of a second embodiment of a method according to the invention for selecting a frequency converter;
  • FIG. 8 is a schematic representation of the second embodiment of the frequency converter according to the invention in determining the limitations of the application field;
  • FIG. 10 is a schematic representation of a frequency converter with a
  • Fig. 11 is a diagrammatic representation of a voltage control signal for the frequency converter over the operating frequency
  • Fig. 12 is an illustration of output voltages of the frequency converter similar to Fig. 3 in the case of a fluctuating mains voltage.
  • An in Fig. 1 schematically illustrated refrigerant circuit 10 includes a refrigerant compressor unit 20, which has a refrigerant compressor 22 and a refrigerant compressor 22 driving electric drive motor 24, wherein the refrigerant compressor 22 and the drive motor 24 may be integrated, for example, in one unit.
  • the refrigerant compressor 22 in the refrigerant circuit 10 compresses the circulating refrigerant therein, which is then supplied in the refrigerant circuit 10 to a pressure-side heat exchanger unit 12, in which the compressed refrigerant is cooled by discharging heat W, in particular condenses.
  • the cooled, in particular condensed, refrigerant is supplied in the refrigerant circuit 10 to an expansion element 14, in which the compressed, in particular condensed and pressurized refrigerant is expanded and then fed in the refrigerant circuit 10 to a heat exchanger unit 16, in which the expanded refrigerant is able to heat W to thereby develop its cooling effect.
  • the refrigerant expanded in the heat exchanger unit 16 is subsequently supplied again to the refrigerant compressor 22 and compressed by the refrigerant compressor 22.
  • the refrigerant compressor 22 is thus at an inlet 32, the expanded refrigerant, which has already absorbed heat in the heat exchanger unit 16, fed at a saturation temperature STE, then compressed in the refrigerant compressor 22 and exits at an outlet 34 of the refrigerant compressor with a saturation temperature STA.
  • the refrigerant compressor 22 works due to design and refrigerant damage without certain pairs of values of the saturation temperature STE at the inlet 32 and the saturation temperature STA at the outlet 34 of the refrigerant compressor 22, which by a in FIG. 2, wherein the saturation temperature STE at the inlet 32 and the y-axis the saturation temperature STA at the outlet 34 are plotted in the deployment diagram 36 on the X-axis.
  • Saturation temperature STE from the inlet 32 and the saturation temperature STA at the outlet 34 each define a working state AZ of the refrigerant compressor 22 that can be realized with the respective refrigerant compressor 22.
  • Each working state AZ requires that the refrigerant compressor 22 is driven by the electric drive motor 24, a certain electrical power consumption P A z of the drive motor 24th
  • the electrical power consumption value P AZ of the drive motor 24 is on the one hand dependent on the respective working state AZ in the application field EF and on the other hand depends on the rotational speed of the refrigerant compressor 22.
  • the speed of the refrigerant compressor 22 is proportional to the operating frequency f at which the drive motor 24 is fed by the frequency converter 40.
  • each working state AZ within the application field EF is assigned an electrical power consumption value P AZ at a specific operating frequency f.
  • the electric power consumption value P AZ of the electric drive motor 24 depends not only on the operating state AZ of the refrigerant compressor 22, but also on the type of the electric drive motor 24 and the wiring of the windings thereof with the frequency converter 40. In the illustrated embodiment, it is assumed that the electric drive motor 24 is an asynchronous motor or a permanent magnet motor whose windings are connected to the frequency converter 40 in star connection.
  • the maximum operating frequency f max of the frequency converter 40 for operating the electric drive motor is on the one hand due to the structure of the electric drive motor 24 and on the other hand by the structure of the refrigerant compressor 22 and is usually at values of 80 Hertz or less while the corner frequency f ECK usually in the range between 40 and 60 hertz lies.
  • the maximum output voltage U FUMAX which is available at the output of the frequency converter 40 for operating the drive motor 24, is proportional to the intermediate circuit voltage of the frequency converter 40 and thus proportional to the supply voltage of the frequency converter 40.
  • the power consumption value P AZI in a working state AZ1 of the deployment diagram 36 is higher than in a working state AZ2 of the deployment diagram 36, which, as shown in FIG. 3 results in the operating point operating current values I A zi being at higher values than the operating point operating current values I A z 2 in the operating state AZ 2.
  • the operating state operating current values I A z provided by the frequency converter 40 depend on the operating states AZ and thus the frequency converter 40 must be capable of operating states operating current I A of different values depending on the operating state AZ z to produce.
  • the cost of the frequency converter 40 depends on which inverter maximum current value I FUMAX a frequency converter 40 can provide and are the higher, the greater the maximum inverter current value I FUMAX .
  • operating state AZ S which may be, for example, the working state AZ1 or AZ2, and the selected operating frequency f s are optimized, so a selection of the frequency converter 40 can be under
  • Operating frequency f s required working state operating current value I AZfe .
  • the working state operating current value I AZfe is to be determined.
  • the determination of the operating state operating current value I A zf S at the respective operating frequency f s is, as shown in FIG. 4, with a data processing unit 50, comprising an input unit 52, in particular combined with a visualization unit 53, to display the usage diagram 36 and to select the working state AZ S and the operating frequency f s .
  • the data processing unit 50 works with experimental
  • Power consumption values P A zExf in the form of a performance data field. With these electrical power consumption values P AZ Exf is then taking into account the Steinmetz equivalent circuit diagram for the drive motor 24, shown in Fig. 5 and the known resistance values R and reactance values X, in one of the data processing unit 50 assigned
  • Memory 56 are stored, the ability to calculate the impedance Z according to formula (Fl) of the drive motor 24 and then when equating the experimentally determined power consumption value P A zf S at the selected operating frequency f s with the theoretical power consumption value P A z with the impedance Z, the slip s from the formula (F2) iteratively to determine and then with the slip s the Ulstands worriessstromwert -Azfs from the formula (F3) at the respective selected operating frequency f s to determine.
  • formula (Fl) of the drive motor 24 and then when equating the experimentally determined power consumption value P A zf S at the selected operating frequency f s with the theoretical power consumption value P A z with the impedance Z, the slip s from the formula (F2) iteratively to determine and then with the slip s the Hästandsconcesstromwert -Azfs from the formula (F3) at the respective selected operating frequency f s to determine.
  • a determination of the suitable frequency converter 40 is made such that the inverter maximum current value I FUMAX made available by the frequency converter 40 must be greater than the operating state operating current value I AZfs determined for the respective operating state AZ at the selected frequency f s .
  • a starting current value I ANLEX for the respective refrigerant compressor unit 20 is also used, which was likewise determined experimentally and stored in a memory 58 and which may optionally be greater than the operating state operating current value I AZfs .
  • the frequency converter 40 is designed to be overloadable, so that a converter startup maximum current value I FUANLMAX is available which is greater than the inverter maximum current value I FUMAX , for example, for a period of 3 seconds may be 170% of the converter maximum current value I FUMAX ,
  • the converter maximum current value I FU is greater than the working state operating current value I AZFE and the converter start maximum current value I F U A N LMAX is greater than the starting current value I A N LEX the refrigerant ⁇ compressor unit 20, as shown for example in FIG. 3, but the maximum inverter current I FUMAX and the inverter startup maximum current I FUANLMAX should be as close as possible to the working state operating current value I AZ fs and the starting current value I ANLEX , to select a frequency converter with the lowest possible maximum inverter current value I FUMAXS , which is the most cost effective solution.
  • Selection process ensures that it is able to operate the refrigerant compressor unit 20 in the selected working state AZ S , but it is not ensured with such a selected frequency converter 40 that so that the refrigerant compressor 22 can be operated in all working conditions AZ within the field of application EF ,
  • the boundary lines G fs shown in FIG. 2 and FIG. 6 result for different selected operating frequencies f s .
  • the boundary line G fs represents the boundary line for the field of application EF at the operating frequency f s selected for the selection of the frequency converter 40.
  • the boundary line G fr represents a boundary line for
  • the limitation of the field of use EF at a smaller operating frequency fr than the selected operating frequency fs and the boundary line Grrr represents a boundary line of the field of use EF for a still smaller selected operating frequency frr, represented by the data processing unit 50 on a visualization unit 53 together with the deployment diagram 36 become.
  • the current I A zf to determine and store in a memory 54 ', so that in a selection made by the user of the working state AZ S and the selected operating frequency f s directly in the memory 56 on the corresponding working state operating current value I AZfe can be accessed and this working state operating current value I AZfe corresponding to the selected working state AZ S can be directly read out without further effort and using the experimentally determined starting current value I ANLEX the selection of the frequency converter 40s can be described using the frequency converter maximum currents I FUMAX stored in the memory 62 in the manner already explained in connection with the first embodiment.
  • the maximum frequency converter current I FUMAXS can be used to determine in memory 54 'the operating states AZCAL fs associated with this current value and the sum of all these operating states AZCAL fs as the respective limit line G fs, for example on a visualization unit 64, as in the context of the first
  • Embodiment described, represent.
  • the operating state operating current values I A zf are to be determined experimentally in the memory 54 'and stored in the memory 54', so that in the third exemplary embodiment, in a similar manner as in FIG second embodiment on the basis of the values in the memory 54 ', the selection of
  • Frequency converter 40s can be done.
  • the data processing unit 50 can proceed in the reverse case in the determination of the boundary lines G fs according to the second embodiment, wherein in the memory 54 'then the experimentally determined Häschandsconcesstromlus I A zf are stored, which then
  • the frequency control of the frequency converter 40s used is preferably carried out by a frequency control unit 70, on the one hand the
  • Saturation temperature STE or alternatively detects the saturation pressure at the input 32 of the refrigerant compressor 22 and a comparison member 74 supplies, on which on the other hand, a temperature preset signal TV is applied. Depending on how large the deviation of the saturation temperature STE from the temperature specification signal TV, a control of a
  • Proportional controller 76 which generates a frequency request signal FAS, which is supplied to a frequency converter control 78, which then in accordance with the frequency request signal FAS, the frequency f of
  • Inverter 40s specifies with which then the drive motor 24 is operated.
  • a working state AZ3 occur in which the working state operating current I A z3, as shown in Fig. 3, is so high that at frequencies f above the corner frequency f ECK the case may occur that already at a cutoff frequency f L of Inverter maximum current value I FUMAX is achieved, wherein the cut-off frequency f L is lower than the operating frequency provided for example for the working state AZ1 f s .
  • a frequency limiting unit 80 which limits the operating frequency f of the frequency converter 40 when it is above the corner frequency f ECK so that the working state operating current value I AZ does not exceed the inverter maximum current value I FUMAXS , but at most reaches the maximum inverter current value I FUMAXS . This ensures that the frequency converter 40s does not switch off the frequency converter 40 even at operating conditions that could lead to a current of the frequency converter 40 exceeding the maximum inverter current value I FUMAX at operating frequencies f above the corner frequency f ECK .
  • the frequency limiting unit 80 includes, as shown in FIG. 9, a current sensor 84 arranged in a supply line 72 which leads from the frequency converter 40s to the drive motor 24, which measures the actual working state operating current value I AZ and supplies it to a comparison element 86 which predefines the actual operating state operating current value I AZ with the inverter maximum current value I FUMAX Value compares and that
  • acting frequency limiting element 94 generates, which is another
  • a comparator 88 coupled to the current sensor 84 is additionally provided, which compares the operating state current value I AZ measured by the current sensor 84 with a compressor maximum operating current value I VMAX and drives a limiting regulator 98, for example a proportional regulator , which is the one from the current sensor 84 measured actual working state operating current value I AZ the
  • Compressor maximum current value I VMAX also generates a frequency- limiting signal and this the frequency limiting element 94 transmitted.
  • the frequency-limiting signals of the limiting controllers 92 and 98 are compared with one another in a minimizing section 102 and the frequency-limiting signal is fed to the frequency limiting element 94, which leads to the lowest limit frequency f L.
  • the frequency limiting element 94 is preferably still referred to as
  • Reference value transmitted to the corner frequency f EC K which represents the minimum frequency to which a frequency limitation is made by the frequency limiting element 94.
  • a conventional frequency converter 40 shown in FIG. 10, includes a rectifier stage 112, an inverter stage 114 and an intermediate stage between the rectifier 112 and the inverter stage 114 provided
  • the intermediate circuit voltage U z is dependent on the rectifier stage 112 supplied to the mains voltage U N and varies in proportion to the mains voltage U N.
  • the inverter stage 114 of the frequency converter 40 is controlled by the frequency converter control 78, to which the frequency request signal FAS is supplied.
  • the frequency converter control 78 generates on the basis of the frequency request signal FAS by means of a proportional element 118 a
  • Voltage control signal SSS which is supplied in addition to the frequency request signal FAS an inverter stage controller 122, the output voltage U F u generated based on the frequency request signal FAS and the voltage control signal SSS, which indicates, for example, percent maximum output voltage U FUMAX.
  • the frequency converter 40 is therefore assigned a voltage adjustment unit 130 which, with a voltage measuring unit 132, assigns the intermediate circuit voltage U z in FIG.
  • DC link 116 measures and this DC link voltage U z a divider 134 supplies, which also a reference frequency f RE is supplied.
  • the reference frequency f REF is dimensioned such that, given a setpoint value U Z s of the intermediate circuit voltage U z , the proportionality factor desired for the rise of the output voltage U F u of the converter 40 over the frequency F results.
  • this divider 134 is supplied to a further divider 136 to which, on the other hand, the desired proportionality factor PF is supplied for the increase of the output voltage U F u of the frequency converter 40 over the operating frequency f, which corresponds to the intermediate circuit voltage setpoint U zs divided by the reference frequency f RE .
  • the result of the second divider 136 is a proportionality correction factor PKF, which is one if the result of the first divider 134 supplied to this divider 136 corresponds to the desired proportionality factor and deviates from 1 if the intermediate circuit voltage U z deviates from the intermediate circuit voltage setpoint value U zs .
  • PKF proportionality correction factor
  • the proportionality correction factor PKF generated by the divider 136 is then fed to the proportional element 118, then the proportionality behavior PV provided in the proportional element 118 can be varied between the operating frequency f of the frequency request signal FAS and the voltage control signal SSS. How the proportionality between the operating frequency f of the frequency request signal FAS and the voltage control signal SSS varies is shown, for example, in FIG. 11 is shown.
  • the function of the voltage adjustment unit 130 is that, when the intermediate circuit voltage U z corresponds to the intermediate circuit voltage setpoint U Z s, as shown in FIG. 11, the corner frequency of the target corner frequency fECKso is, for example, 50 Hertz.
  • the voltage control signal SSS of 100% is achieved at lower operating frequencies than the desired corner frequency f E ci ⁇ .
  • the voltage control signal SSS of 100% at higher operating frequencies f is achieved as the desired corner frequency fECKso.
  • the corner frequency f EC K ie the frequency at which the maximum output voltage UFUMAX is reached at the output of the frequency converter 40, varies, in accordance with the deviation of the intermediate circuit voltage U z from the intermediate circuit voltage setpoint U zs , so that the maximum output voltage UFUMAX of the frequency converter 40 varies.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention a pour objet d'apporter des améliorations à un procédé pour sélectionner un convertisseur de fréquence pour une unité à compresseur frigorifique comprenant un compresseur frigorifique et un moteur d'entraînement électrique, de sorte que le convertisseur de fréquence est choisi pour permettre une utilisation optimale. À cet effet, un état de travail adapté au fonctionnement de l'unité à compresseur frigorifique est sélectionné dans un champ utilisation d'un diagramme d'utilisation du compresseur frigorifique, une fréquence de travail est sélectionnée en plus de cet état de travail sélectionné, et une valeur de courant de fonctionnement d'état de travail correspondant à l'état de travail sélectionné et à la fréquence de travail sélectionnée est déterminée pour le fonctionnement de l'unité à compresseur frigorifique, à partir de données d'entraînement.
EP16718356.5A 2016-04-25 2016-04-25 Procédé pour sélectionner un convertisseur de fréquence pour une unité à compresseur frigorifique Pending EP3449565A1 (fr)

Priority Applications (1)

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EP23192737.7A EP4254780A3 (fr) 2016-04-25 2016-04-25 Procédé pour sélectionner un convertisseur de fréquence pour une unité à compresseur frigorifique

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PCT/EP2016/059168 WO2017186259A1 (fr) 2016-04-25 2016-04-25 Procédé pour sélectionner un convertisseur de fréquence pour une unité à compresseur frigorifique

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EP16718356.5A Pending EP3449565A1 (fr) 2016-04-25 2016-04-25 Procédé pour sélectionner un convertisseur de fréquence pour une unité à compresseur frigorifique
EP23192737.7A Pending EP4254780A3 (fr) 2016-04-25 2016-04-25 Procédé pour sélectionner un convertisseur de fréquence pour une unité à compresseur frigorifique

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US (1) US10804834B2 (fr)
EP (2) EP3449565A1 (fr)
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CN108923713B (zh) * 2018-07-20 2021-12-21 江苏大学 一种五相永磁同步电机单相开路故障的容错控制方法

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JP3297159B2 (ja) * 1993-09-14 2002-07-02 東芝キヤリア株式会社 直流ブラシレスモータの駆動装置およびその良否識別方法
US5796237A (en) * 1995-03-13 1998-08-18 Tajima Engineering Kabushiki Kaishya Efficiency control system for an induction motor
CN100334802C (zh) * 2001-11-23 2007-08-29 丹福斯驱动器公司 用于不同电源电压的频率转换器
CN100369348C (zh) * 2002-07-12 2008-02-13 丰田自动车株式会社 用于检测辅助电源从多相电机的断开的方法和系统
ES2656211T3 (es) * 2003-05-08 2018-02-26 Mitsubishi Denki Kabushiki Kaisha Método para proporcionar un servicio de ahorro de energía, y dispositivo de congelación / aire acondicionado
US7164242B2 (en) * 2004-02-27 2007-01-16 York International Corp. Variable speed drive for multiple loads
US20080041081A1 (en) * 2006-08-15 2008-02-21 Bristol Compressors, Inc. System and method for compressor capacity modulation in a heat pump
DE102008051199A1 (de) * 2008-10-14 2010-04-29 Maamar Bouchareb Verfahren und Anordnung zur Lüfteransteuerung
JP2010288370A (ja) * 2009-06-11 2010-12-24 Sharp Corp インバータの制御装置およびインバータを制御するための方法
CN102506529B (zh) * 2011-10-24 2013-07-17 深圳百时得能源环保科技有限公司 一种单级制冷剂系统的控制方法及其优化器

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CN109155607A (zh) 2019-01-04
US20190058433A1 (en) 2019-02-21
EP4254780A3 (fr) 2024-01-03
CN109155607B (zh) 2023-06-23
EP4254780A2 (fr) 2023-10-04
US10804834B2 (en) 2020-10-13
WO2017186259A1 (fr) 2017-11-02

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