WO2022091184A1 - 電力変換装置、モータ駆動装置および冷凍サイクル適用機器 - Google Patents

電力変換装置、モータ駆動装置および冷凍サイクル適用機器 Download PDF

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Publication number
WO2022091184A1
WO2022091184A1 PCT/JP2020/040131 JP2020040131W WO2022091184A1 WO 2022091184 A1 WO2022091184 A1 WO 2022091184A1 JP 2020040131 W JP2020040131 W JP 2020040131W WO 2022091184 A1 WO2022091184 A1 WO 2022091184A1
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WIPO (PCT)
Prior art keywords
power
capacitor
inverter
pulsation
conversion device
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.)
Ceased
Application number
PCT/JP2020/040131
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English (en)
French (fr)
Japanese (ja)
Inventor
貴昭 ▲高▼原
浩一 有澤
啓介 植村
遥 松尾
公洋 松崎
健治 ▲高▼橋
彰 佐竹
基 豊田
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to KR1020237012790A priority Critical patent/KR20230066623A/ko
Priority to AU2020475165A priority patent/AU2020475165B2/en
Priority to JP2022558617A priority patent/JP7345673B2/ja
Priority to CN202080106399.5A priority patent/CN116420302B/zh
Priority to PCT/JP2020/040131 priority patent/WO2022091184A1/ja
Priority to US18/042,475 priority patent/US12525890B2/en
Priority to EP20959702.0A priority patent/EP4236053A4/en
Publication of WO2022091184A1 publication Critical patent/WO2022091184A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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
    • H02M1/14—Arrangements for reducing ripples from DC input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from DC input or output
    • H02M1/143—Arrangements for reducing ripples from DC input or output using compensating arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from DC input or output
    • H02M1/15—Arrangements for reducing ripples from DC input or output using active elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • 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
    • 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
    • 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
    • F25B13/00—Compression machines, plants or systems, with reversible 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
    • 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
    • F25B2600/024—Compressor control by controlling the electric parameters, e.g. current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation

Definitions

  • the present disclosure relates to a power conversion device, a motor drive device, and a refrigeration cycle applicable device for converting AC power into desired power.
  • a power conversion device that converts AC power supplied from an AC power source into desired AC power and supplies it to a load such as an air conditioner.
  • a power conversion device which is a control device for an air conditioner, rectifies AC power supplied from an AC power supply by a diode stack, which is a rectifying unit, and further smoothes a plurality of powers by a smoothing capacitor.
  • the present disclosure has been made in view of the above, and an object of the present disclosure is to obtain a power conversion device capable of suppressing the increase in size of the device while suppressing the deterioration of the smoothing capacitor.
  • the power conversion device is connected to a rectifying unit that rectifies a first AC power supplied from a commercial power source and an output end of the rectifying unit.
  • a rectifying unit that rectifies a first AC power supplied from a commercial power source and an output end of the rectifying unit.
  • the inverter connected to the capacitor and both ends of the capacitor, converting the power output from the rectifying section and the capacitor to the second AC power and outputting it to the load having the motor, and the pulsation of the power flowing from the rectifying section to the capacitor.
  • It is provided with a control unit that controls the operation of the inverter so that the second AC power including the corresponding pulsation is output from the inverter to the load and suppresses the current flowing through the capacitor.
  • the power conversion device has the effect of suppressing the deterioration of the smoothing capacitor and suppressing the increase in size of the device.
  • a diagram showing an example of each current and the capacitor voltage of the capacitor of the smoothing part when the current output from the rectifying part is smoothed by the smoothing part and the current flowing through the inverter is made constant.
  • the figure which shows the example of each current and the capacitor voltage of the capacitor of the smooth part when the control part of the power conversion apparatus which concerns on Embodiment 1 controls the operation of the inverter and reduces the current which flows in a smooth part.
  • FIG. 1 is a diagram showing a configuration example of the power conversion device 1 according to the first embodiment.
  • the power converter 1 is connected to the commercial power supply 110 and the compressor 315.
  • the power conversion device 1 converts the first AC power of the power supply voltage Vs supplied from the commercial power supply 110 into the second AC power having a desired amplitude and phase, and supplies the first AC power to the compressor 315.
  • the power conversion device 1 includes a voltage / current detection unit 501, a reactor 120, a rectifier unit 130, a voltage detection unit 502, a smoothing unit 200, an inverter 310, current detection units 313a and 313b, a control unit 400, and the like.
  • the motor drive device 2 is composed of the power converter 1 and the motor 314 included in the compressor 315.
  • the voltage / current detection unit 501 detects the voltage value and current value of the first AC power of the power supply voltage Vs supplied from the commercial power supply 110, and outputs the detected voltage value and current value to the control unit 400.
  • the reactor 120 is connected between the voltage / current detection unit 501 and the rectifying unit 130.
  • the rectifying unit 130 has a bridge circuit composed of rectifying elements 131 to 134, and rectifies and outputs the first AC power of the power supply voltage Vs supplied from the commercial power supply 110.
  • the rectifying unit 130 performs full-wave rectification.
  • the voltage detection unit 502 detects the voltage value of the electric power rectified by the rectifier unit 130, and outputs the detected voltage value to the control unit 400.
  • the smoothing unit 200 is connected to the output end of the rectifying unit 130 via the voltage detecting unit 502.
  • the smoothing unit 200 has a capacitor 210 as a smoothing element, and smoothes the electric power rectified by the rectifying unit 130.
  • the capacitor 210 is, for example, an electrolytic capacitor, a film capacitor, or the like.
  • the capacitor 210 has a capacity for smoothing the electric power rectified by the rectifying unit 130, and the voltage generated in the capacitor 210 due to the smoothing is not the full-wave rectified waveform shape of the commercial power supply 110, but the commercial power supply for the DC component. It has a waveform shape in which voltage ripple corresponding to the frequency of 110 is superimposed, and does not pulsate significantly.
  • the frequency of this voltage ripple is twice the frequency of the power supply voltage Vs when the commercial power supply 110 is single-phase, and is mainly composed of six times the frequency when the commercial power supply 110 is three-phase.
  • the amplitude of this voltage ripple is determined by the capacity of the capacitor 210.
  • the voltage ripple generated in the capacitor 210 is pulsating in a range where the maximum value is less than twice the minimum value.
  • the inverter 310 is connected to the smoothing portion 200, that is, both ends of the capacitor 210.
  • the inverter 310 has switching elements 311a to 311f and freewheeling diodes 312a to 312f.
  • the inverter 310 turns on and off the switching elements 311a to 311f under the control of the control unit 400, converts the power output from the rectifying unit 130 and the smoothing unit 200 into a second AC power having a desired amplitude and phase, and compresses the power. Output to machine 315.
  • the current detection units 313a and 313b each detect the current value of one of the three-phase currents output from the inverter 310, and output the detected current value to the control unit 400.
  • the control unit 400 can calculate the current value of the remaining one phase output from the inverter 310 by acquiring the current value of two phases out of the current values of the three phases output from the inverter 310. ..
  • the compressor 315 is a load having a motor 314 for driving the compressor.
  • the motor 314 rotates according to the amplitude and phase of the second AC power supplied from the inverter 310, and performs a compression operation.
  • the compressor 315 is a closed type compressor used in an air conditioner or the like, the load torque of the compressor 315 can often be regarded as a constant torque load.
  • the arrangement of each configuration shown in FIG. 1 is an example, and the arrangement of each configuration is not limited to the example shown in FIG.
  • the reactor 120 may be arranged after the rectifying unit 130.
  • the voltage / current detection unit 501, the voltage detection unit 502, and the current detection units 313a and 313b may be collectively referred to as a detection unit.
  • the voltage value and the current value detected by the voltage / current detection unit 501, the voltage value detected by the voltage detection unit 502, and the current value detected by the current detection units 313a and 313b may be referred to as a detection value. ..
  • the control unit 400 acquires the voltage value and the current value of the first AC power of the power supply voltage Vs from the voltage / current detection unit 501, and acquires the voltage value of the power rectified by the rectifying unit 130 from the voltage detection unit 502.
  • the current value of the second AC power having a desired amplitude and phase converted by the inverter 310 is acquired from the current detection units 313a and 313b.
  • the control unit 400 controls the operation of the inverter 310, specifically, the on / off of the switching elements 311a to 311f of the inverter 310 by using the detection value detected by each detection unit.
  • the control unit 400 outputs a second AC power including a pulsation corresponding to the pulsation of the electric power flowing from the rectifying unit 130 to the capacitor 210 of the smoothing unit 200 from the inverter 310 to the compressor 315 which is a load.
  • the operation of the inverter 310 is controlled so as to be performed.
  • the pulsation according to the pulsation of the electric power flowing into the capacitor 210 of the smoothing portion 200 is, for example, a pulsation that fluctuates depending on the frequency of the pulsation of the electric power flowing into the capacitor 210 of the smoothing portion 200.
  • the control unit 400 suppresses the current flowing through the capacitor 210 of the smoothing unit 200.
  • the control unit 400 does not have to use all the detected values acquired from each detection unit, and may perform control using some of the detected values.
  • the load generated by the inverter 310 and the compressor 315 can be regarded as a constant load, and when viewed in terms of the current output from the smoothing section 200, it is determined by the smoothing section 200.
  • the following description will be given assuming that the current load is connected.
  • the current flowing from the rectifying unit 130 is the current I1
  • the current flowing through the inverter 310 is the current I2
  • the current flowing from the smoothing unit 200 is the current I3.
  • the current I2 is a combination of the current I1 and the current I3.
  • the current I3 can be expressed as the difference between the current I2 and the current I1, that is, the current I2-current I1.
  • the discharging direction of the smoothing portion 200 is the positive direction, and the charging direction of the smoothing portion 200 is the negative direction. That is, a current may flow into the smoothing portion 200, and a current may flow out.
  • FIG. 2 shows the capacitors of the respective currents I1 to I3 and the capacitor 210 of the smoothing section 200 when the current output from the rectifying section 130 is smoothed by the smoothing section 200 and the current I2 flowing through the inverter 310 is made constant.
  • Vdc the example of the voltage Vdc. From the top, the capacitor voltage Vdc of the capacitor 210 generated according to the current I1, the current I2, the current I3, and the current I3 is shown.
  • the vertical axis of the currents I1, I2, and I3 indicates the current value, and the vertical axis of the capacitor voltage Vdc indicates the voltage value. All horizontal axes indicate time t.
  • the carrier components of the inverter 310 are actually superimposed on the currents I2 and I3, but they are omitted here. The same shall apply thereafter.
  • the control unit 400 controls the current I2 flowing through the inverter 310, that is, controls the operation of the inverter 310 so as to reduce the current I3 flowing through the smoothing unit 200.
  • FIG. 3 shows capacitors of the currents I1 to I3 and the smoothing section 200 when the control section 400 of the power conversion device 1 according to the first embodiment controls the operation of the inverter 310 to reduce the current I3 flowing through the smoothing section 200.
  • the vertical axis of the currents I1, I2, and I3 indicates the current value, and the vertical axis of the capacitor voltage Vdc indicates the voltage value. All horizontal axes indicate time t.
  • the control unit 400 of the power conversion device 1 controls the operation of the inverter 310 so that the current I2 as shown in FIG. 3 flows through the inverter 310, so that the rectifying unit 130 to the smoothing unit 400 is compared with the example of FIG.
  • the frequency component of the current flowing through the 200 can be reduced, and the current I3 flowing through the smoothing portion 200 can be reduced.
  • the control unit 400 controls the operation of the inverter 310 so that the current I2 including the pulsating current whose main component is the frequency component of the current I1 flows through the inverter 310.
  • the frequency component of the current I1 is determined by the frequency of the alternating current supplied from the commercial power supply 110 and the configuration of the rectifying unit 130. Therefore, the control unit 400 can set the frequency component of the pulsating current superimposed on the current I2 as a component having a predetermined amplitude and phase.
  • the frequency component of the pulsating current superimposed on the current I2 has a similar waveform to the frequency component of the current I1.
  • the control unit 400 reduces the current I3 flowing through the smoothing unit 200 and reduces the pulsating voltage generated in the capacitor voltage Vdc as the frequency component of the pulsating current superimposed on the current I2 approaches the frequency component of the current I1. can do.
  • Controlling the pulsation of the current flowing through the inverter 310 by controlling the operation of the inverter 310 by the control unit 400 is the same as controlling the pulsation of the first AC power output from the inverter 310 to the compressor 315. Is.
  • the control unit 400 controls the operation of the inverter 310 so that the pulsation included in the second AC power output from the inverter 310 is smaller than the pulsation of the power output from the rectifying unit 130.
  • the voltage ripple of the capacitor voltage Vdc that is, the voltage ripple generated in the capacitor 210 does not include the pulsation corresponding to the pulsation of the power flowing into the capacitor 210 in the second AC power output from the inverter 310.
  • the amplitude and phase of the pulsation included in the second AC power output from the inverter 310 are controlled so as to be smaller than the voltage ripple generated in the capacitor 210 at that time.
  • the control unit 400 tells the capacitor 210 that the current ripple flowing in and out of the capacitor 210 does not include the pulsation corresponding to the pulsation of the power flowing into the capacitor 210 in the second AC power output from the inverter 310.
  • the amplitude and phase of the pulsation included in the second AC power output from the inverter 310 are controlled so as to be smaller than the generated current ripple.
  • the alternating current supplied from the commercial power supply 110 is not particularly limited and may be single-phase or three-phase.
  • the control unit 400 may determine the frequency component of the pulsating current superimposed on the current I2 according to the first AC power supplied from the commercial power supply 110. Specifically, the control unit 400 uses the pulsating waveform of the current I2 flowing through the inverter 310 to be twice the frequency of the first AC power when the first AC power supplied from the commercial power supply 110 is single-phase.
  • the frequency component or the first AC power supplied from the commercial power supply 110 is three-phase, the shape is obtained by adding the DC component to the pulsating waveform whose main component is a frequency component six times the frequency of the first AC power. Control.
  • the pulsation waveform is, for example, the shape of an absolute value of a sine wave or the shape of a sine wave.
  • the control unit 400 may add at least one frequency component out of an integral multiple of the frequency of the sine wave to the pulsation waveform as a predetermined amplitude.
  • the pulsation waveform may be in the shape of a rectangular wave or a triangular wave.
  • the control unit 400 may set the amplitude and phase of the pulsation waveform to predetermined values.
  • the control unit 400 may calculate the pulsation amount included in the second AC power output from the inverter 310 by using the voltage applied to the capacitor 210 or the current flowing through the capacitor 210, or the commercial power supply 110 may calculate the pulsation amount.
  • the voltage or current of the first AC power supplied may be used to calculate the pulsation amount of the pulsation included in the second AC power output from the inverter 310.
  • FIG. 4 is a flowchart showing the operation of the control unit 400 included in the power conversion device 1 according to the first embodiment.
  • the control unit 400 acquires a detection value from each detection unit of the power conversion device 1 (step S1).
  • the control unit 400 controls the operation of the inverter 310 based on the acquired detected value so that the current I3 flowing through the smoothing unit 200 is reduced (step S2).
  • FIG. 5 is a diagram showing an example of a hardware configuration that realizes the control unit 400 included in the power conversion device 1 according to the first embodiment.
  • the control unit 400 is realized by the processor 91 and the memory 92.
  • the processor 91 is a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, microprocessor, processor, DSP (Digital Signal Processor)), or system LSI (Large Scale Integration).
  • the memory 92 is a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable Read Only Memory), an EEPROM (registered trademark) (Electrically Memory), or an EEPROM (registered trademark).
  • a semiconductor memory can be exemplified. Further, the memory 92 is not limited to these, and may be a magnetic disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versaille Disc).
  • the control unit 400 controls the operation of the inverter 310 based on the detection value acquired from each detection unit, and the current I2 flowing through the inverter 310.
  • the power conversion device 1 can use a capacitor having a small ripple current withstand as compared with the case where the control of the present embodiment is not performed by reducing the current I3 flowing through the smoothing portion 200.
  • the power conversion device 1 can reduce the capacity of the mounted capacitor 210 as compared with the case where the control of the present embodiment is not performed because the pulsating voltage of the capacitor voltage Vdc is lowered.
  • the power conversion device 1 can reduce the number of capacitors 210 constituting the smoothing portion 200.
  • the power conversion device 1 controls the operation of the inverter 310 so that the pulsation included in the second AC power becomes smaller than the pulsation of the power output from the rectifying unit 130, so that the current flowing through the inverter 310 It is possible to suppress the pulsation component superimposed on I2 from becoming excessive.
  • the superposition of the pulsating component increases the effective current value passing through the inverter 310, the motor 314, etc. as compared with the non-superimposed state, but by suppressing the superimposing pulsating component from becoming excessive, the inverter It is possible to provide a system in which the current capacity of the 310, the increase in the loss of the inverter 310, the increase in the loss of the motor 314, and the like are suppressed.
  • the power conversion device 1 can suppress the vibration of the compressor 315 generated due to the pulsation of the current I2 by controlling the present embodiment.
  • FIG. 6 is a diagram showing a configuration example of the refrigeration cycle application device 900 according to the second embodiment.
  • the refrigeration cycle application device 900 according to the second embodiment includes the power conversion device 1 described in the first embodiment.
  • the refrigeration cycle application device 900 according to the second embodiment can be applied to products including a refrigeration cycle such as an air conditioner, a refrigerator, a freezer, and a heat pump water heater.
  • a refrigeration cycle such as an air conditioner, a refrigerator, a freezer, and a heat pump water heater.
  • the components having the same functions as those of the first embodiment are designated by the same reference numerals as those of the first embodiment.
  • the compressor 315 having a built-in motor 314, the four-way valve 902, the indoor heat exchanger 906, the expansion valve 908, and the outdoor heat exchanger 910 form the refrigerant pipe 912 according to the first embodiment. It is attached via.
  • a compression mechanism 904 for compressing the refrigerant and a motor 314 for operating the compression mechanism 904 are provided inside the compressor 315.
  • the refrigeration cycle applicable device 900 can perform heating operation or cooling operation by switching operation of the four-way valve 902.
  • the compression mechanism 904 is driven by a variable speed controlled motor 314.
  • the refrigerant is pressurized by the compression mechanism 904 and sent out, and passes through the four-way valve 902, the indoor heat exchanger 906, the expansion valve 908, the outdoor heat exchanger 910 and the four-way valve 902. Return to the compression mechanism 904.
  • the refrigerant is pressurized by the compression mechanism 904 and sent out, and passes through the four-way valve 902, the outdoor heat exchanger 910, the expansion valve 908, the indoor heat exchanger 906 and the four-way valve 902. Return to the compression mechanism 904.
  • the indoor heat exchanger 906 acts as a condenser to release heat, and the outdoor heat exchanger 910 acts as an evaporator to absorb heat.
  • the outdoor heat exchanger 910 acts as a condenser to release heat, and the indoor heat exchanger 906 acts as an evaporator to absorb heat.
  • the expansion valve 908 depressurizes the refrigerant and expands it.
  • the configuration shown in the above embodiments is an example, and can be combined with another known technique, can be combined with each other, and does not deviate from the gist. It is also possible to omit or change a part of the configuration.
  • 1 Power conversion device 2 Motor drive device, 110 Commercial power supply, 120 reactor, 130 rectifying unit, 131-134 rectifying element, 200 smoothing unit, 210 capacitor, 310 inverter, 311a to 311f switching element, 312a to 312f freewheeling diode, 313a , 313b Current detector, 314 motor, 315 compressor, 400 control unit, 501 voltage current detector, 502 voltage detector, 900 refrigeration cycle applicable equipment, 902 four-way valve, 904 compression mechanism, 906 indoor heat exchanger, 908 expansion Valve, 910 outdoor heat exchanger, 912 refrigerant piping.

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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)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Ac Motors In General (AREA)
PCT/JP2020/040131 2020-10-26 2020-10-26 電力変換装置、モータ駆動装置および冷凍サイクル適用機器 Ceased WO2022091184A1 (ja)

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KR1020237012790A KR20230066623A (ko) 2020-10-26 2020-10-26 전력 변환 장치, 모터 구동 장치 및 냉동 사이클 적용 기기
AU2020475165A AU2020475165B2 (en) 2020-10-26 2020-10-26 Power conversion apparatus, motor drive apparatus, and refrigeration cycle apparatus
JP2022558617A JP7345673B2 (ja) 2020-10-26 2020-10-26 電力変換装置、モータ駆動装置および冷凍サイクル適用機器
CN202080106399.5A CN116420302B (zh) 2020-10-26 2020-10-26 电力转换装置、马达驱动装置以及制冷循环应用设备
PCT/JP2020/040131 WO2022091184A1 (ja) 2020-10-26 2020-10-26 電力変換装置、モータ駆動装置および冷凍サイクル適用機器
US18/042,475 US12525890B2 (en) 2020-10-26 2020-10-26 Power conversion apparatus, motor drive apparatus, and refrigeration cycle apparatus
EP20959702.0A EP4236053A4 (en) 2020-10-26 2020-10-26 POWER CONVERTER, MOTOR DRIVE DEVICE AND EQUIPMENT USED IN AN APPLIED REFRIGERATION CYCLE

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