WO2019065005A1 - 制御装置、制御方法及びプログラム - Google Patents

制御装置、制御方法及びプログラム Download PDF

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Publication number
WO2019065005A1
WO2019065005A1 PCT/JP2018/030920 JP2018030920W WO2019065005A1 WO 2019065005 A1 WO2019065005 A1 WO 2019065005A1 JP 2018030920 W JP2018030920 W JP 2018030920W WO 2019065005 A1 WO2019065005 A1 WO 2019065005A1
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Prior art keywords
distortion
unit
input current
terminal
parameter
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Ceased
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PCT/JP2018/030920
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English (en)
French (fr)
Japanese (ja)
Inventor
謙一 相場
正和 久原
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Mitsubishi Heavy Industries Thermal Systems Ltd
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Mitsubishi Heavy Industries Thermal Systems Ltd
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Priority to AU2018339256A priority Critical patent/AU2018339256B2/en
Priority to EP18863423.2A priority patent/EP3672051A4/en
Priority to CN201880062366.8A priority patent/CN111133665B/zh
Publication of WO2019065005A1 publication Critical patent/WO2019065005A1/ja
Anticipated expiration legal-status Critical
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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
    • H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC
    • H02M5/42—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters
    • H02M5/44—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC
    • H02M5/453—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02M1/12—Arrangements for reducing harmonics from AC 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
    • H02M3/1586—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
    • 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

Definitions

  • the present invention relates to a control device, a control method, and a program.
  • Priority is claimed on Japanese Patent Application No. 2017-186239, filed on Sep. 27, 2017, the content of which is incorporated herein by reference.
  • Patent Document 1 describes a technique for applying a converter device to an air conditioner to reduce the size and simplification of the device.
  • An object of the present invention is to provide a control device, a control method, and a program that can solve the above-mentioned problems.
  • the control device generates a plurality of control signals for controlling the current flowing in the circuit that flows the current according to the differential voltage across the reactor, and the plurality of controls And a distortion measurement unit that measures distortion of a current flowing in the circuit with respect to a signal.
  • the control unit controls a plurality of control signals flowing to a converter circuit through which a current according to a differential voltage across the reactor flows.
  • the distortion measurement unit may measure distortion of current flowing in the converter circuit for the plurality of control signals.
  • the control unit is configured to determine distortion that is a minimum value or a minimum value among the distortions of the plurality of control signals.
  • the control signal may be generated, and the generated control signal may be used to control the circuit.
  • a control method includes: generating a plurality of control signals for controlling the current flowing in a circuit through which a current flows according to a differential voltage across the reactor; Measuring the distortion of the current flowing in the circuit.
  • a program includes: generating a plurality of control signals for controlling the current flowing in a circuit that causes a current to flow in the computer according to a differential voltage across the reactor; Measuring the distortion of the current flowing in the circuit for the control signal.
  • control device the control method, and the program according to the embodiment of the present invention, it is possible to reduce the distortion of the input current caused by the distortion of the power supply voltage in the circuit where the current flows according to the differential voltage across the reactor.
  • FIG. 1 is a diagram showing the configuration of a motor drive device 1 according to an embodiment of the present invention.
  • the motor drive device 1 is a device that converts AC power from the AC power supply 4 into DC power, converts the DC power into three-phase AC power, and outputs the converted power to the compressor motor 20.
  • the motor drive device 1 includes a converter device 2 (an example of a circuit through which a current according to a differential voltage across the reactor flows, an example of a converter circuit), and an inverter device 3.
  • the converter device 2 is a device that converts AC power from the AC power supply 4 into DC power and outputs the DC power to the inverter device 3.
  • the converter device 2 includes a rectification circuit 5, a switching circuit 10a, a switching circuit 10b, a smoothing capacitor 12, a converter control unit 15, and an input current detection unit 30.
  • the rectifier circuit 5 includes an input terminal, a reference terminal on the input side, an output terminal, and a reference terminal on the output side.
  • the potential of the reference terminal on the input side is a potential serving as a reference of the potential at the input terminal.
  • the potential of the reference terminal on the output side is a potential serving as a reference of the potential at the output terminal.
  • the rectifier circuit 5 converts AC power input from the AC power supply 4 into DC power, and outputs the DC power to the switching circuit 10a and the switching circuit 10b.
  • the switching circuit 10 a applies a current to the smoothing capacitor 12 to generate a voltage input to the inverter device 3.
  • the switching circuit 10a includes a reactor 6a, a diode 7a, and a switching element 8a.
  • the reactor 6a includes a first terminal and a second terminal.
  • the diode 7a includes an anode terminal and a cathode terminal.
  • the switching element 8a includes a first terminal, a second terminal, and a third terminal.
  • the switching element 8a controls the current flowing from the second terminal to the third terminal by switching between the on state and the off state according to the signal received by the first terminal, thereby switching the switching circuit 10a to the switching circuit 10a. Change the value of the flowing current.
  • a field effect transistor FET: Field Effect Transistor
  • IGBT Insulated Gate Bipolar Transistor
  • the switching circuit 10b applies a current to the smoothing capacitor 12 to generate a voltage to be input to the inverter device 3.
  • the switching circuit 10b includes a reactor 6b, a diode 7b, and a switching element 8b.
  • the reactor 6 b includes a first terminal and a second terminal.
  • the diode 7 b includes an anode terminal and a cathode terminal. Similar to the switching element 8a, the switching element 8b includes a first terminal, a second terminal, and a third terminal.
  • the switching element 8b controls the current flowing from the second terminal to the third terminal by switching between the on state and the off state according to the signal received by the first terminal, thereby switching the switching circuit 10b to the switching circuit 10b. Change the value of the flowing current.
  • a field effect transistor, an IGBT or the like can be mentioned.
  • the switching element 8b is, for example, an nMOS transistor
  • the first terminal of the switching element 8b is a gate terminal
  • the second terminal is a source terminal
  • the third terminal is a drain terminal.
  • the smoothing capacitor 12 includes a first terminal and a second terminal.
  • the smoothing capacitor 12 receives current from both the switching circuit 10a and the switching circuit 10b. That is, the voltage input to the inverter device 3 is determined by the sum of the current values flowing to the smoothing capacitor 12 from both the switching circuit 10 a and the switching circuit 10 b.
  • the input current detection unit 30 includes an input terminal and an output terminal.
  • the input current detection unit 30 detects a return current to the AC power supply 4 (hereinafter referred to as “input current”).
  • the input current detection unit 30 provides the converter control unit 15 with information on the detected input current.
  • Converter control unit 15 includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal.
  • Converter control unit 15 receives information on the input current from input current detection unit 30 via the first input terminal, and observes the input current waveform.
  • Converter control unit 15 controls switching circuit 10a via the first output terminal. Further, converter control unit 15 controls 10 b via the second output terminal.
  • Converter control unit 15 identifies a control signal with a small distortion of the input current waveform from the input current waveform when control signal Sg1 of switching circuit 10a and control signal Sg2 of switching circuit 10b are changed.
  • the AC power supply 4 includes an output terminal and a reference terminal.
  • the AC power supply 4 supplies AC power to the converter device 2.
  • the zero cross detection unit 17 includes a first input terminal, a second input terminal, and an output terminal.
  • the zero cross detection unit 17 detects the zero cross point of the voltage output from the AC power supply 4 via the first input terminal and the second input terminal.
  • the zero cross point indicates the time at which the voltage output from the AC power supply 4 crosses zero volts, and this time is the reference time in the processing of the motor drive device 1.
  • the zero crossing detection unit 17 generates a zero crossing signal including information on the cell crossing point.
  • the zero cross detection unit 17 outputs a zero cross signal to the converter control unit 15 via the output terminal.
  • the inverter device 3 is a device that converts DC power output from the converter device 2 into three-phase AC power and outputs it to the compressor motor 20.
  • the inverter device 3 includes a bridge circuit 18 and an inverter control unit 19.
  • the bridge circuit 18 includes an input terminal, a first output terminal, a second output terminal, a third output terminal, and a reference terminal.
  • the potential of the reference terminal is a potential serving as a reference of the potential at each of the input terminal, the first output terminal, the second output terminal, and the third output terminal.
  • the bridge circuit 18 includes switching elements 181, 182, 183, 184, 185, 186.
  • the bridge circuit 18 is configured by switching elements 181 and 182, switching elements 183 and 184, and switching elements 185 and 186, respectively.
  • Each of the switching elements 181 to 186 includes a first terminal, a second terminal, and a third terminal.
  • Each of the switching elements 181 to 186 controls the current flowing from the second terminal to the third terminal by switching between an on state and an off state according to a signal received by the first terminal.
  • Three-phase AC power for driving the compressor motor 20 is generated, and the generated three-phase AC power is output to the compressor motor 20.
  • Examples of the switching elements 181, 182, 183, 184, 185, 186 include power field effect transistors, IGBTs, and the like.
  • the inverter control unit 19 includes a first output terminal, a second output terminal, a third output terminal, a fourth output terminal, a fifth output terminal, and a sixth output terminal.
  • the first output terminal of the inverter control unit 19 is a terminal for outputting, to the first terminal of the switching element 181, a gate drive signal for switching between the on state and the off state of the switching element 181.
  • the second output terminal of the inverter control unit 19 is a terminal for outputting a gate drive signal for switching a period in which the switching element 182 is on and a period in which the switching element 182 is off to the first terminal of the switching element 182.
  • the third output terminal of the inverter control unit 19 is a terminal for outputting, to the first terminal of the switching element 183, a gate drive signal for switching between the on state and the off state of the switching element 183.
  • the fourth output terminal of the inverter control unit 19 is a terminal for outputting, to the first terminal of the switching element 184, a gate drive signal for switching between the on state and the off state of the switching element 184.
  • the fifth output terminal of the inverter control unit 19 is a terminal for outputting, to the first terminal of the switching element 185, a gate drive signal for switching between the on state and the off state of the switching element 185.
  • the sixth output terminal of the inverter control unit 19 is a terminal for outputting, to the first terminal of the switching element 186, a gate drive signal for switching between the on state and the off state of the switching element 186.
  • the first to sixth output terminals of the inverter control unit 19 are omitted.
  • gate drive signals output from the first to sixth output terminals of the inverter control unit 19 to the bridge circuit 18 are collectively shown as a gate drive signal Spwm.
  • the inverter control unit 19 controls the opening and closing of the switching element in the bridge circuit 18.
  • the inverter control unit 19 generates a gate drive signal Spwm of the switching elements 181 to 186 based on, for example, a request rotational speed command input from a higher-level device (not shown).
  • the inverter control unit 19 supplies the gate drive signal Spwm to the bridge circuit 18 via the first to sixth output terminals.
  • Examples of a specific method of inverter control include vector control, sensorless vector control, V / F (Variable Frequency) control, overmodulation control, and one pulse control.
  • the input terminal of the rectifier circuit 5 is connected to the output terminal of the AC power supply 4 and the first input terminal of the zero cross detection unit 17.
  • the reference terminal on the input side of the rectifier circuit 5 is connected to the reference terminal of the AC power supply 4, the second input terminal of the zero cross detection unit 17, and the input terminal of the input current detection unit 30.
  • the output terminal of the rectifier circuit 5 is connected to the first terminal of the reactor 6a and the first terminal of the reactor 6b.
  • the reference terminal on the output side of the rectifier circuit 5 is the third terminal of the switching element 8a, the third terminal of the switching element 8b, the second terminal of the smoothing capacitor 12, and the reference terminal of the inverter device 3 (switching elements 182 and 184 , 186 and the respective third terminals).
  • the 2nd terminal of reactor 6a is connected to the anode terminal of diode 7a, and the 2nd terminal of switching element 8a.
  • the 2nd terminal of reactor 6b is connected to the anode terminal of diode 7b, and the 2nd terminal of switching element 8b.
  • the cathode terminal of the diode 7a is connected to the cathode terminal of the diode 7b, the first terminal of the smoothing capacitor 12, and the input terminal of the inverter device 3 (the second terminals of the switching elements 181, 183, and 185).
  • a first terminal of switching element 8 a is connected to a first output terminal of converter control unit 15.
  • the first terminal of switching element 8 b is connected to the second output terminal of converter control unit 15.
  • the first terminal of converter control unit 15 is connected to the output terminal of input current detection unit 30.
  • the second terminal of converter control unit 15 is connected to the output terminal of zero cross detection unit 17.
  • the first terminal of the switching element 181 is connected to the first output terminal of the inverter control unit 19.
  • the first terminal of the switching element 182 is connected to the second output terminal of the inverter control unit 19.
  • the first terminal of the switching element 183 is connected to the third output terminal of the inverter control unit 19.
  • the first terminal of the switching element 184 is connected to the fourth output terminal of the inverter control unit 19.
  • the first terminal of switching element 185 is connected to the fifth output terminal of inverter control unit 19.
  • the first terminal of the switching element 186 is connected to the sixth output terminal of the inverter control unit 19.
  • the third terminal of switching element 181 is connected to the second terminal of switching element 182 and the first terminal of compressor motor 20.
  • the third terminal of switching element 183 is connected to the second terminal of switching element 184 and the second terminal of compressor motor 20.
  • the third terminal of switching element 185 is connected to the second terminal of switching element 186 and the first terminal of compressor motor 20.
  • the DC voltage detection unit is a detection unit that detects an input DC voltage Vdc of the bridge circuit 18.
  • the motor current detection unit is a detection unit that detects each phase current iu, iv, iw flowing to the compressor motor 20.
  • the motor current detection unit inputs these detection values Vdc, iu, iv and iw to the inverter control unit 19.
  • the motor current detection unit may detect the current flowing through the negative electrode side power line between the bridge circuit 18 and the smoothing capacitor 12 and obtain the phase currents iu, iv, iw from the detection signal.
  • FIG. 2 is a functional block diagram of converter control unit 15. As shown in FIG. 2, the converter control unit 15 includes a waveform observation unit 21, a control signal generation unit 22 (an example of a control unit), a distortion measurement unit 23, and a storage unit 24.
  • the converter control unit 15 includes a waveform observation unit 21, a control signal generation unit 22 (an example of a control unit), a distortion measurement unit 23, and a storage unit 24.
  • the waveform observation unit 21 receives, from the zero cross detection unit 17, a zero cross signal indicating the zero cross point of the AC power supply 4 detected by the zero cross detection unit 17.
  • the waveform observation unit 21 receives an input current waveform from the input current detection unit 30.
  • the waveform observation unit 21 observes the input current waveform on the basis of the zero cross point.
  • the control signal generation unit 22 generates a first switching signal Sg1 for controlling the switching circuit 10a and a second switching signal Sg2 for controlling the switching circuit 10b. Specifically, as shown in FIGS. 3A and 3C, the control signal generation unit 22 generates a predetermined triangular wave and a voltage command.
  • the predetermined triangular wave is a signal of a waveform serving as a reference.
  • the voltage command is a signal in which a sine wave and a harmonic component having a sine wave as a fundamental wave are superimposed. Then, the control signal generation unit 22 compares the triangular wave and the voltage command, and based on the comparison result, controls the switching element 8a as shown in FIGS. 3 (b) and 3 (d).
  • a second switching signal Sg2 for controlling the switching element 8b is generated.
  • the control signal generation unit 22 takes an absolute value as shown in FIG. 4B, for example, for the signal obtained by superimposing the fundamental wave and the third harmonic shown in FIG. Let the absolute value be the voltage command.
  • the control signal generation unit 22 normalizes the amplitude of the harmonic component with the amplitude of the fundamental wave.
  • the voltage command D in this case can be expressed as the following equation (1).
  • the distortion measurement unit 23 changes the first switching signal Sg1 and the second switching signal Sg2 when the control signal generation unit 22 changes the voltage command using the phase difference f1t, the amplitude f3s, and the amplitude f3c as parameters. Distortion of the input current that occurs when
  • the measurement of the distortion of the input current performed by the distortion measurement unit 23 is based on the input current waveform received by the waveform observation unit 21, and for example, the distortion is calculated from the ratio of each frequency component by Fourier transform. It may be calculated or calculated using other techniques.
  • the distortion here is the distortion factor ⁇ represented by the following equation (2).
  • the control signal generation unit 22 generates an initial parameter of the voltage command for the phase difference f1t, the amplitude f3s, and the amplitude f3c (step S11a).
  • the initial parameter of phase difference f1t is phase value f1t1
  • the initial parameter of amplitude f3s is amplitude f3s1
  • the initial parameter of amplitude f3c is amplitude f3c1.
  • a combination of the initial parameter phase value f1t1, the amplitude f3s1, and the amplitude f3c1 at this time is set as a parameter Param1.
  • the waveform observation unit 21 receives an input current from the zero cross point to the next zero cross point from the input current detection unit 30 (step S12 a).
  • the waveform observation unit 21 outputs the value of the input current from the zero crossing point to the next zero crossing point to the distortion measurement unit 23.
  • the distortion measurement unit 23 receives the value of the parameter Param1 from the control signal generation unit 22.
  • the distortion measurement unit 23 also receives the value of the input current from the zero cross point to the next zero cross point from the waveform observation unit 21.
  • the distortion measuring unit 23 measures distortion of the input current from the zero crossing point to the next zero crossing point based on the value of the input current from the zero crossing point to the next zero crossing point (step S13a).
  • the distortion measuring unit 23 associates the measurement result of the distortion of the input current from the zero crossing point to the next zero crossing point with the parameter Param1 and stores the result in the storage unit 24 (step S14a).
  • the distortion measurement unit 23 notifies the control signal generation unit 22 of the completion of the measurement.
  • the distortion measurement unit 23 receives the value of the parameter Param2 from the control signal generation unit 22.
  • the distortion measurement unit 23 also receives the value of the input current from the zero cross point to the next zero cross point from the waveform observation unit 21.
  • the distortion measuring unit 23 measures distortion of the input current based on the value of the input current (step S17a).
  • the distortion measuring unit 23 stores the distortion measurement result of the input current and the parameter Param2 in the storage unit 24 in association with each other (step S18a).
  • the distortion measurement unit 23 notifies the control signal generation unit 22 of the completion of the measurement.
  • the waveform observation unit 21 receives an input current from the input current detection unit 30 (step S20a).
  • the waveform observation unit 21 outputs the value of the received input current to the distortion measurement unit 23.
  • the distortion measuring unit 23 receives the value of the parameter Param3 from the control signal generating unit 22. Further, the distortion measurement unit 23 receives the value of the input current from the waveform observation unit 21. The distortion measuring unit 23 measures distortion of the input current based on the value of the input current (step S21a). The distortion measuring unit 23 stores the distortion measurement result of the input current and the parameter Param3 in the storage unit 24 in association with each other (step S22a). The distortion measurement unit 23 notifies the control signal generation unit 22 of the completion of the measurement.
  • the control signal generation unit 22 When the control signal generation unit 22 receives the notification of measurement completion from the distortion measurement unit 23, the control signal generation unit 22 reads the measurement result of the distortion of the input current associated with each of the parameter Param1, the parameter Param2, and the parameter Param3 from the storage unit 24. The control signal generation unit 22 generates distortion of the input current of the parameter Param1 as distortion of the first input current, distortion of the input current of the parameter Param2 as distortion of the second input current, and distortion of the input current of the parameter Param3. It is written in the storage unit 24 as distortion of the third input current. The control signal generation unit 22 compares the measurement results of the distortion of the first to third input currents, and determines whether the distortion of the first input current is minimum (step S23a).
  • control signal generation unit 22 determines whether the distortion of the first input current is not the minimum (NO in step S23a).
  • a parameter for obtaining distortion of the second input current as a parameter set as a fixed value in this case The parameter Param2 is set, for example, by writing in the storage unit 24 (step S26a), and the process proceeds to a process of setting the amplitude f3s which is a parameter.
  • step S25a when the control signal generation unit 22 determines that the distortion of the second input current is not the minimum (NO in step S25a), a parameter for which the distortion of the third input current is obtained as a parameter set as a fixed value (this In the case, the parameter Param3) is set (step S27a), and the process proceeds to the process of setting the amplitude f3s which is the parameter.
  • converter control unit 15 performs the process of step S2 shown in FIG. 5 for setting phase difference f3s which is a parameter.
  • the process of step S2 is a process of setting the amplitude f3s which is a parameter without changing parameters other than the amplitude f3s set in the process of step S1.
  • the process of step S2 shown in FIG. 5 is performed as in the process flow shown in FIG. Specifically, the process of step S2 for setting the amplitude f3s is the process of steps S11 b to S27 b described below.
  • the control signal generation unit 22 generates a parameter of the voltage command with the phase difference f1t, the amplitude f3s, and the amplitude f3c set in the process of step S1 as initial parameters (step S11b).
  • the phase difference f1t set in the process of step S1 is the phase value f1t
  • the amplitude f3s set in the process of step S1 is the amplitude f3s1
  • the amplitude f3c set in the process of step S1 is the amplitude f3c1.
  • a combination of the initial parameter phase value f1t1, the amplitude f3s1, and the amplitude f3c1 at this time is set as a parameter Param1.
  • the control signal generation unit 22 outputs the first switching signal Sg1 generated for the parameter Param1 to the switching circuit 10a and the generated second switching signal Sg2 to the switching circuit 10b.
  • the control signal generation unit 22 outputs the value of the parameter Param1 to the distortion measurement unit 23.
  • the waveform observation unit 21 receives an input current from the zero cross point to the next zero cross point from the input current detection unit 30 (step S12 b).
  • the waveform observation unit 21 outputs the value of the input current from the zero crossing point to the next zero crossing point to the distortion measurement unit 23.
  • the distortion measurement unit 23 receives the value of the parameter Param1 from the control signal generation unit 22.
  • the distortion measurement unit 23 also receives the value of the input current from the zero cross point to the next zero cross point from the waveform observation unit 21.
  • the distortion measuring unit 23 measures distortion of the input current from the zero crossing point to the next zero crossing point based on the value of the input current from the zero crossing point to the next zero crossing point (step S13 b).
  • the distortion measuring unit 23 associates the measurement result of distortion of the input current from the zero crossing point to the next zero crossing point with the parameter Param1 and stores the result in the storage unit 24 (step S14 b).
  • the distortion measurement unit 23 notifies the control signal generation unit 22 of the completion of the measurement.
  • the control signal generation unit 22 When the control signal generation unit 22 receives the notification of measurement completion from the distortion measurement unit 23, the control signal generation unit 22 does not change the phase difference f1t1 and the amplitude f3c1 as parameters, and makes the value larger by the minimum setting width ⁇ f3s of the amplitude f3s than the amplitude f3s1.
  • a voltage command is generated for the set amplitude f3s2 (step S15b).
  • a combination of a phase difference f1t1, an amplitude f3s2, and an amplitude f3c1 which are parameters in this case is set as a parameter Param2.
  • the control signal generation unit 22 outputs the first switching signal Sg1 generated for the parameter Param2 to the switching circuit 10a and the generated second switching signal Sg2 to the switching circuit 10b.
  • the control signal generation unit 22 outputs the value of the parameter Param2 to the distortion measurement unit 23.
  • the waveform observation unit 21 receives an input current from the zero cross point to the next zero cross point from the input current detection unit 30 (step S16 b). The waveform observation unit 21 outputs the value of the received input current to the distortion measurement unit 23.
  • the distortion measurement unit 23 receives the value of the parameter Param2 from the control signal generation unit 22.
  • the distortion measurement unit 23 also receives the value of the input current from the zero cross point to the next zero cross point from the waveform observation unit 21.
  • the distortion measuring unit 23 measures distortion of the input current based on the value of the input current (step S17 b).
  • the distortion measuring unit 23 stores the distortion measurement result of the input current and the parameter Param2 in the storage unit 24 in association with each other (step S18 b).
  • the distortion measurement unit 23 notifies the control signal generation unit 22 of the completion of the measurement.
  • the control signal generation unit 22 When the control signal generation unit 22 receives the notification of measurement completion from the distortion measurement unit 23, the amplitude is set to a value smaller than the amplitude f3s1 by the minimum setting width ⁇ f3s without changing the parameters phase difference f1t1 and amplitude f3c1.
  • a voltage command is generated for f3s3 (step S19b).
  • a combination of a phase difference f1t1, an amplitude f3s3, and an amplitude f3c1 which are parameters in this case is set as a parameter Param3.
  • the control signal generation unit 22 outputs the first switching signal Sg1 generated for the parameter Param3 to the switching circuit 10a and the generated second switching signal Sg2 to the switching circuit 10b.
  • the control signal generation unit 22 outputs the value of the parameter Param3 to the distortion measurement unit 23.
  • the waveform observation unit 21 receives the input current from the input current detection unit 30 (step S20b). The waveform observation unit 21 outputs the value of the received input current to the distortion measurement unit 23.
  • the distortion measuring unit 23 receives the value of the parameter Param3 from the control signal generating unit 22. Further, the distortion measurement unit 23 receives the value of the input current from the waveform observation unit 21. The distortion measuring unit 23 measures distortion of the input current based on the value of the input current (step S21 b). The distortion measuring unit 23 associates the measurement result of distortion of the input current with the parameter Param 3 and stores the result in the storage unit 24 (step S22 b). The distortion measurement unit 23 notifies the control signal generation unit 22 of the completion of the measurement.
  • the control signal generation unit 22 When the control signal generation unit 22 receives the notification of measurement completion from the distortion measurement unit 23, the control signal generation unit 22 reads the measurement result of the distortion of the input current associated with each of the parameter Param1, the parameter Param2, and the parameter Param3 from the storage unit 24. The control signal generation unit 22 generates distortion of the input current of the parameter Param1 as distortion of the first input current, distortion of the input current of the parameter Param2 as distortion of the second input current, and distortion of the input current of the parameter Param3. It is written in the storage unit 24 as distortion of the third input current. The control signal generation unit 22 compares the measurement results of the distortions of the first to third input currents, and determines whether the distortion of the first input current is minimum (step S23b).
  • control signal generation unit 22 determines that the distortion of the first input current is minimum (YES in step S23b), that is, an intermediate value among three different amplitudes f3s1, f3s1- ⁇ f3s, f3s1 + ⁇ f3s (in this case)
  • a parameter in this case, the parameter Param1 from which distortion of the first input current can be obtained as a parameter set as a fixed value. It sets by writing in the part 24 (step S24 b), and it progresses to the process which sets amplitude f3 c which is a parameter.
  • control signal generation unit 22 determines whether the distortion of the first input current is not the minimum (NO in step S23 b). If the control signal generation unit 22 determines whether the distortion of the second input current is the minimum (step S25 b). ). When the control signal generation unit 22 determines that the distortion of the second input current is minimum (YES in step S25 b), a parameter that can obtain distortion of the second input current as a parameter set as a fixed value (in this case The parameter Param2) is set (step S26b), and the process proceeds to the process of setting the amplitude f3c which is a parameter.
  • the parameter Param2 a parameter that can obtain distortion of the second input current as a parameter set as a fixed value
  • step S27b a parameter for which the distortion of the third input current is obtained as a parameter set as a fixed value (this In the case, the parameter Param3) is set (step S27b), and the process proceeds to the process of setting the amplitude f3c which is the parameter.
  • converter control unit 15 performs the process of step S3 shown in FIG. 5 for setting phase difference f3c which is a parameter.
  • the process of step S3 is a process of setting the amplitude f3c, which is a parameter, without changing parameters other than the amplitude f3c set in the process of step S2.
  • the process of step S3 shown in FIG. 5 is performed as in the process flow shown in FIG. Specifically, the process of step S3 for setting the amplitude f3c is the process of steps S11c to S27c described below.
  • the control signal generation unit 22 generates a parameter of the voltage command with the phase difference f1t, the amplitude f3s, and the amplitude f3c set in the process of step S2 as initial parameters (step S11c).
  • the phase difference f1t set in the process of step S2 is the phase value f1t
  • the amplitude f3s set in the process of step S2 is the amplitude f3s1
  • the amplitude f3c set in the process of step S2 is the amplitude f3c1.
  • a combination of the initial parameter phase value f1t1, the amplitude f3s1, and the amplitude f3c1 at this time is set as a parameter Param1.
  • the control signal generation unit 22 outputs the first switching signal Sg1 generated for the parameter Param1 to the switching circuit 10a and the generated second switching signal Sg2 to the switching circuit 10b.
  • the control signal generation unit 22 outputs the value of the parameter Param1 to the distortion measurement unit 23.
  • the waveform observation unit 21 receives an input current from the zero cross point to the next zero cross point from the input current detection unit 30 (step S12 c).
  • the waveform observation unit 21 outputs the value of the input current from the zero crossing point to the next zero crossing point to the distortion measurement unit 23.
  • the distortion measurement unit 23 receives the value of the parameter Param1 from the control signal generation unit 22.
  • the distortion measurement unit 23 also receives the value of the input current from the zero cross point to the next zero cross point from the waveform observation unit 21.
  • the distortion measuring unit 23 measures distortion of the input current from the zero crossing point to the next zero crossing point based on the value of the input current from the zero crossing point to the next zero crossing point (step S13 c).
  • the distortion measuring unit 23 associates the measurement result of distortion of the input current from the zero crossing point to the next zero crossing point with the parameter Param 1 and stores the result in the storage unit 24 (step S14 c).
  • the distortion measurement unit 23 notifies the control signal generation unit 22 of the completion of the measurement.
  • the control signal generation unit 22 When the control signal generation unit 22 receives the notification of measurement completion from the distortion measurement unit 23, the control signal generation unit 22 does not change the parameters phase difference f1t1 and amplitude f3s1, and makes the value larger by the minimum setting width ⁇ f3c of the amplitude f3c than the amplitude f3c1.
  • a voltage command is generated for the set amplitude f3c2 (step S15c).
  • a combination of a phase difference f1t1, an amplitude f3s1, and an amplitude f3c2 which are parameters in this case is set as a parameter Param2.
  • the control signal generation unit 22 outputs the first switching signal Sg1 generated for the parameter Param2 to the switching circuit 10a and the generated second switching signal Sg2 to the switching circuit 10b.
  • the control signal generation unit 22 outputs the value of the parameter Param2 to the distortion measurement unit 23.
  • the waveform observation unit 21 receives an input current from the zero cross point to the next zero cross point from the input current detection unit 30 (step S16 c). The waveform observation unit 21 outputs the value of the received input current to the distortion measurement unit 23.
  • the distortion measurement unit 23 receives the value of the parameter Param2 from the control signal generation unit 22.
  • the distortion measurement unit 23 also receives the value of the input current from the zero cross point to the next zero cross point from the waveform observation unit 21.
  • the distortion measuring unit 23 measures distortion of the input current based on the value of the input current (step S17 c).
  • the distortion measurement unit 23 stores the distortion measurement result of the input current and the parameter Param2 in the storage unit 24 in association with each other (step S18 c).
  • the distortion measurement unit 23 notifies the control signal generation unit 22 of the completion of the measurement.
  • the control signal generation unit 22 When the control signal generation unit 22 receives the notification of measurement completion from the distortion measurement unit 23, the amplitude is set to a value smaller than the amplitude f3c1 by the minimum setting width ⁇ f3c without changing the parameters phase difference f1t1 and amplitude f3s1.
  • a voltage command is generated for f3c3 (step S19c).
  • a combination of a phase difference f1t1, an amplitude f3s1, and an amplitude f3c3 which are parameters in this case is set as a parameter Param3.
  • the control signal generation unit 22 outputs the first switching signal Sg1 generated for the parameter Param3 to the switching circuit 10a and the generated second switching signal Sg2 to the switching circuit 10b.
  • the control signal generation unit 22 outputs the value of the parameter Param3 to the distortion measurement unit 23.
  • the waveform observation unit 21 receives an input current from the input current detection unit 30 (step S20 c).
  • the waveform observation unit 21 outputs the value of the received input current to the distortion measurement unit 23.
  • the distortion measuring unit 23 receives the value of the parameter Param3 from the control signal generating unit 22. Further, the distortion measurement unit 23 receives the value of the input current from the waveform observation unit 21. The distortion measuring unit 23 measures distortion of the input current based on the value of the input current (step S21 c). The distortion measuring unit 23 associates the measurement result of distortion of the input current with the parameter Param 3 and stores the result in the storage unit 24 (step S22 c). The distortion measurement unit 23 notifies the control signal generation unit 22 of the completion of the measurement.
  • the control signal generation unit 22 When the control signal generation unit 22 receives the notification of measurement completion from the distortion measurement unit 23, the control signal generation unit 22 reads the measurement result of the distortion of the input current associated with each of the parameter Param1, the parameter Param2, and the parameter Param3 from the storage unit 24. The control signal generation unit 22 generates distortion of the input current of the parameter Param1 as distortion of the first input current, distortion of the input current of the parameter Param2 as distortion of the second input current, and distortion of the input current of the parameter Param3. It is written in the storage unit 24 as distortion of the third input current. The control signal generation unit 22 compares the measurement results of the distortion of the first to third input currents, and determines whether the distortion of the first input current is minimum (step S23c).
  • step S23c determines that the distortion of the first input current is minimum (YES in step S23c), that is, an intermediate value (in this case, three different amplitudes f3c1, f3c1-.DELTA.f3c, f3c1 + .DELTA.f3c)
  • an intermediate value in this case, three different amplitudes f3c1, f3c1-.DELTA.f3c, f3c1 + .DELTA.f3c
  • a parameter in this case, the parameter Param1 from which the distortion of the first input current can be obtained as the parameter set as a fixed value. It sets by writing in the part 24 (step S24 c). Then, the control signal generation unit 22 proceeds to the process of step S4, which determines whether or not the parameter Param1 is set in all steps of step S1, step S2 and step S3 shown in FIG.
  • control signal generation unit 22 determines whether the distortion of the first input current is not the minimum (NO in step S23 c), it determines whether the distortion of the second input current is the minimum (step S25 c) ).
  • the control signal generation unit 22 determines that the distortion of the second input current is minimum (YES in step S25 c)
  • a parameter that can obtain distortion of the second input current as a parameter set as a fixed value in this case , Parameter Param2 is set (step S26c). Then, the control signal generation unit 22 proceeds to the process of step S4, which determines whether or not the parameter Param1 is set in all steps of step S1, step S2 and step S3 shown in FIG.
  • step S27 c a parameter for which the distortion of the third input current is obtained as a parameter set as a fixed value (this In the case, the parameter Param3) is set (step S27 c). Then, the control signal generation unit 22 proceeds to the process of step S4, which determines whether or not the parameter Param1 is set in all steps of step S1, step S2 and step S3 shown in FIG.
  • control signal generation unit 22 determines that the parameter Param1 is not set in at least one of steps S1, S2, and S3 in the process of step S4, the process returns to the process of step S1.
  • the control signal generation unit 22 determines that the parameter Param1 is set in all the steps S1, S2, and S3 in the process of step S4, the process is completed.
  • the control signal generation unit 22 generates a voltage command using the set phase difference f1t, the amplitude f3c, and the amplitude f3s as parameters.
  • the input current from the zero crossing point to the next zero crossing point is the average of the measurement results of the input current for several natural times. By this, it is possible to reduce the influence of noise and load fluctuation applied to the compressor motor 20.
  • the motor drive device 1 has been described above.
  • the control signal generation unit 22 controls the current flowing in the converter circuit in which the current flows according to the differential voltage between both ends of the reactors 6a and 6b.
  • the switching signal Sg1 and the second switching signal Sg2 are generated.
  • the distortion measurement unit 23 measures distortion of the current flowing in the converter circuit for the plurality of first switching signals Sg1 and second switching signals Sg2 (control signals) generated by the control signal generation unit 22.
  • the motor drive device 1 generates the first switching signal Sg1 and the second switching signal that generate the converter circuit in which the current according to the differential voltage across the control signal generating unit 22 and the reactors 6a and 6b flows. It is possible to control by Sg2 (control signal), and it is possible to reduce the distortion of the input current caused by the distortion of the power supply voltage.
  • the converter control unit 15 shows an example of calculating the minimum value of distortion, but in another embodiment of the present invention, the minimum value of distortion may be calculated. .
  • converter control 15 may, for example, measure input current distortion for all possible parameters and identify a minimum value of distortion.
  • converter control unit 15 may specify the minimum value of distortion by another method.
  • the method by which converter control unit 15 specifies the minimum value of distortion in one embodiment of the present invention is not limited to the above method. In one embodiment of the present invention, the method by which converter control unit 15 specifies the minimum value of distortion may use another method such as the Newton method.
  • strain rate ⁇ an example of calculating the strain (strain rate ⁇ ) is shown.
  • the integrated power factor PF shown in the following equation (3) is used instead of the strain. It may be used.
  • the symbol ⁇ is the phase difference between the voltage and current in the AC power supply 4.
  • the input current can be adjusted to be reduced including the power factor cos ⁇ .
  • the active power VI cos ⁇ of the input of the converter device 2 is determined by the inverter device 3 regardless of the operation of the converter device 2, so when the power factor of the converter device 2 is improved, the reactive power VI sin ⁇ of the input of the converter device 2 Is reduced and the apparent power VI, which is the sum of squares of active power and reactive power, is also reduced.
  • the AC power supply 4 is exemplified as a single-phase power supply.
  • the AC power supply 4 may be a three-phase power supply.
  • the harmonic components to be superimposed on the fundamental wave may be the (6n-1) th and (6n + 1) th harmonics (where n is an integer of 1 or more).
  • storage parts may be equipped anywhere in the range to which transmission / reception of suitable information is performed.
  • a plurality of storage units 24 and other storage units may exist in a range where appropriate transmission and reception of information is performed, and the data may be distributed and stored.
  • the order of the processes may be switched as long as the appropriate process is performed.
  • Each of the storage unit 24 and the storage device (including the register and the latch) in the embodiment of the present invention may be provided anywhere as long as appropriate transmission and reception of information is performed.
  • each of the storage unit 24 and the storage device may store a plurality of distributed data in a range where appropriate transmission and reception of information is performed.
  • FIG. 6 is a schematic block diagram showing the configuration of a computer according to at least one embodiment.
  • the computer 50 includes a CPU 60, a main memory 70, a storage 80, and an interface 90, as shown in FIG.
  • each of the above-described converter control unit 15, inverter control unit 19, and other control devices is mounted on the computer 50.
  • each processing unit described above is stored in the storage 80 in the form of a program.
  • the CPU 60 reads the program from the storage 80, develops the program in the main memory 70, and executes the above processing according to the program. Further, the CPU 60 secures a storage area corresponding to each storage unit described above in the main memory 70 according to a program.
  • Examples of the storage 80 include a Hard Disk Drive (HDD), a Solid State Drive (SSD), a magnetic disk, a magneto-optical disk, a Compact Disc Read Only Memory (CD-ROM), and a Digital Versatile Disc Read Only Memory (DVD-ROM). , Semiconductor memory and the like.
  • the storage 80 may be internal media directly connected to the bus of the computer 50 or may be external media connected to the computer 50 via the interface 90 or a communication line. When the program is distributed to the computer 50 by a communication line, the computer 50 that has received the distribution may expand the program in the main memory 70 and execute the above processing.
  • storage 80 is a non-transitory tangible storage medium.
  • the program may realize part of the functions described above.
  • the program may be a file capable of realizing the above-described functions in combination with a program already recorded in a computer system, a so-called difference file (difference program).
  • control device the control method, and the program according to the embodiment of the present invention, it is possible to reduce the distortion of the input current caused by the distortion of the power supply voltage in the circuit where the current flows according to the differential voltage across the reactor.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)
  • Measuring Volume Flow (AREA)
  • Amplifiers (AREA)
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