WO2024176332A1 - 電力変換装置、モータ駆動装置及び冷凍サイクル適用機器 - Google Patents

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

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Publication number
WO2024176332A1
WO2024176332A1 PCT/JP2023/006164 JP2023006164W WO2024176332A1 WO 2024176332 A1 WO2024176332 A1 WO 2024176332A1 JP 2023006164 W JP2023006164 W JP 2023006164W WO 2024176332 A1 WO2024176332 A1 WO 2024176332A1
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Prior art keywords
current
capacitor
inverter
power conversion
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
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PCT/JP2023/006164
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English (en)
French (fr)
Japanese (ja)
Inventor
拓人 山下
貴彦 小林
章斗 田中
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Priority to DE112023005850.4T priority Critical patent/DE112023005850T5/de
Priority to CN202380086781.8A priority patent/CN120693782A/zh
Priority to PCT/JP2023/006164 priority patent/WO2024176332A1/ja
Priority to JP2025501960A priority patent/JPWO2024176332A1/ja
Publication of WO2024176332A1 publication Critical patent/WO2024176332A1/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
    • H02M5/4585—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 having a rectifier with controlled elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from DC input or output
    • H02M1/15—Arrangements for reducing ripples from DC input or output using active elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • 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

Definitions

  • This disclosure relates to a power conversion device that converts AC power into a desired drive power, a motor drive device, and a refrigeration cycle application device.
  • a power conversion device that supplies drive power to a load such as an air conditioner
  • the AC power supplied from an AC power source is rectified by a diode stack, which serves as the rectifier, and converted to DC power, which is then held by a capacitor in the smoothing section.
  • an inverter equipped with multiple switching elements is operated.
  • the inverter's switching elements perform a switching operation, a ripple current whose amplitude fluctuates flows through the capacitor in the smoothing section. The greater the fluctuation range of the amplitude of the ripple current flowing through the capacitor in the smoothing section, the more accelerated the deterioration of the smoothing capacitor over time becomes.
  • Patent Document 1 discloses a technology that makes it possible to use a low-capacity capacitor in the smoothing section by devising switching control for the inverter.
  • the smoothing section capacitors can deteriorate rapidly due to a variety of factors. If the smoothing section capacitors deteriorate rapidly, the guaranteed lifespan of the smoothing section capacitors cannot be ensured. If the smoothing section capacitors deteriorate rapidly, the device may suddenly stop. Such problems are not anticipated in the above-mentioned conventional technologies. For this reason, there is a demand for technology that can appropriately deal with the progression of deterioration of the smoothing section capacitors.
  • the present disclosure has been made in consideration of the above, and aims to obtain a power conversion device that can appropriately deal with the progression of deterioration of the capacitor in the smoothing section.
  • the power conversion device includes a rectifier that rectifies AC current supplied from a commercial power source, a capacitor, an inverter, and a control unit.
  • the rectifier rectifies the AC current supplied from the commercial power source.
  • the capacitor smoothes the rectified current rectified by the rectifier.
  • the inverter converts the current output from the capacitor into a drive current and supplies it to a load.
  • the control unit detects or calculates ripple current flowing in and out of the capacitor, estimates the capacitor's lifetime based on the detected or calculated ripple current, and, if the estimated lifetime is equal to or less than a first threshold value, controls the operation of the inverter so that the estimated lifetime exceeds the first threshold value.
  • the power conversion device disclosed herein has the advantage of being able to appropriately deal with the progression of deterioration of the smoothing section capacitor.
  • FIG. 1 is a diagram showing a configuration example of a power conversion device according to a first embodiment
  • FIG. 1 is a block diagram showing an example of a hardware configuration for implementing the functions of a control unit according to a first embodiment
  • FIG. 13 is a diagram showing the correlation between the ripple current and the estimated life used in the control of the first embodiment. 1 is a flowchart for explaining the control of the first embodiment.
  • FIG. 13 is a diagram showing the correlation between the ripple current and the estimated life used in the control of the second embodiment.
  • 11 is a flowchart for explaining the control of the second embodiment.
  • FIG. 13 is a diagram showing a configuration example of a power conversion device according to a third embodiment; 11 is a flowchart for explaining the control of the third embodiment.
  • FIG. 13 is a diagram showing an example of a display screen displayed on a display unit in the control of the third embodiment;
  • FIG. 13 is a diagram showing a configuration example of a refrigeration cycle application device according to a fourth embodiment.
  • Embodiment 1. 1 is a diagram showing a configuration example of a power conversion device 1 according to a first embodiment.
  • the power conversion device 1 is connected to a commercial power source 110 and a compressor 315.
  • the power conversion device 1 converts a first AC power based on a power source voltage supplied from the commercial power source 110 into a second AC power having a desired amplitude and phase, and supplies the second AC power to the compressor 315.
  • the commercial power source 110 is an example of an AC power source
  • the compressor 315 is an example of a load according to the first embodiment.
  • a motor 314 is mounted on the compressor 315.
  • the power conversion device 1 and the motor 314 provided in the compressor 315 constitute a motor drive device 2.
  • the reactor 120 is connected between the commercial power supply 110 and the rectifier 130.
  • the rectifier 130 has a bridge circuit composed of rectifier elements 131 to 134, and rectifies and outputs the AC current supplied from the commercial power supply 110.
  • the rectifier 130 performs full-wave rectification.
  • the smoothing unit 200 is connected to the output terminal of the rectification unit 130.
  • the smoothing unit 200 has a capacitor 210 as a smoothing element.
  • the capacitor 210 smoothes the rectified current rectified by the rectification unit 130.
  • the capacitor 210 is, for example, an electrolytic capacitor or a film capacitor.
  • the capacitor 210 is connected to the output terminal of the rectification unit 130 and has a capacity capable of smoothing the rectified current rectified by the rectification unit 130.
  • the voltage generated in the capacitor 210 by the smoothing is not a full-wave rectified waveform shape of the commercial power supply 110, but a waveform shape in which a voltage ripple according to the frequency of the commercial power supply 110 is superimposed on a DC component, and does not pulsate significantly.
  • the frequency of the voltage ripple is twice the frequency of the power supply voltage when the commercial power supply 110 is single-phase, and is mainly six times the frequency when the commercial power supply 110 is three-phase.
  • the amplitude of the voltage ripple is determined by the capacitance of the capacitor 210. For example, the maximum value of the voltage ripple generated in the capacitor 210 pulsates within a range that is less than twice the minimum value of the voltage ripple.
  • Current detection unit 501 detects rectified current I1 flowing out from rectification unit 130, and outputs the detection value of the detected rectified current I1 to control unit 400.
  • Current detection unit 502 detects inverter input current I2, and outputs the detection value of the detected inverter input current I2 to control unit 400.
  • Inverter input current I2 is a current that is output from capacitor 210 and flows into inverter 310.
  • Current detection units 501 and 502 can be used as detection units that detect the power state of capacitor 210.
  • the inverter 310 is connected to the smoothing unit 200, i.e., both ends of the capacitor 210.
  • the inverter 310 has switching elements 311a to 311f and freewheeling diodes 312a to 312f.
  • the control unit 400 controls the on/off of the switching elements 311a to 311f of the inverter 310. With this control, the inverter 310 converts the current output from the rectifier unit 130 and the smoothing unit 200 into a drive current for the load. That is, the inverter 310 supplies a drive current to the motor 314 by turning on and off the switching elements 311a to 311f.
  • Current detection units 313a and 313b each detect the current value of one phase of the three-phase motor current output from inverter 310, and output the detected current value to control unit 400. By acquiring the current values of two phases out of the three-phase current values output from inverter 310, control unit 400 can calculate the current value of the remaining one phase output from inverter 310.
  • the motor 314 mounted on the compressor 315 rotates in accordance with the amplitude and phase of the AC power supplied from the inverter 310 to perform compression. If the compressor 315 is a hermetic compressor used in an air conditioner or the like, the load torque of the compressor 315 can often be considered as a constant torque load.
  • each component shown in FIG. 1 is one example, and the arrangement of each component is not limited to the example shown in FIG. 1.
  • the reactor 120 may be arranged after the rectifier 130.
  • the power conversion device 1 may include a boost unit, or the rectifier 130 may be given the function of a boost unit.
  • each of the current detection units 313a, 313b, 501, and 502 may be simply referred to as a "detection unit.”
  • the current values detected by the current detection units 313a, 313b, 501, and 502 may be simply referred to as a "detection value.”
  • the control unit 400 acquires the detection value of the rectified current I1 detected by the current detection unit 501, and the detection value of the inverter input current I2 detected by the current detection unit 502.
  • the control unit 400 also acquires the detection values of the motor current detected by the current detection units 313a and 313b.
  • the control unit 400 uses the detection values detected by each detection unit to control the operation of the inverter 310, specifically, the on/off of the switching elements 311a to 311f of the inverter 310.
  • the control unit 400 controls the speed, voltage, or current of the motor 314 so that it is in the desired state. Note that the control unit 400 does not need to use all the detection values acquired from each detection unit, and can perform control using some of the detection values.
  • the control unit 400 also controls the operation of the inverter 310 so that a second AC power including pulsation corresponding to the pulsation of the power flowing from the rectifier 130 to the capacitor 210 of the smoothing unit 200 is output from the inverter 310 to the compressor 315.
  • the pulsation corresponding to the pulsation of the power flowing into the capacitor 210 of the smoothing unit 200 is, for example, pulsation that varies depending on the frequency of the pulsation of the power flowing in and out of the capacitor 210 of the smoothing unit 200. In this way, the control unit 400 suppresses the ripple current I3 flowing in and out of the capacitor 210.
  • the rectified current I1 is a current that combines the inverter input current I2 and the ripple current I3.
  • the ripple current I3 can be calculated as the difference between the rectified current I1 and the inverter input current I2, that is, I1-I2.
  • the ripple current I3 is positive when the smoothing unit 200 is charged, and negative when the smoothing unit 200 is discharged. That is, the smoothing unit 200 can have current flowing in and out of it.
  • the relationship between the ripple voltage ⁇ V and the ripple current I3 can be calculated in advance by a simulation or the like, and a table that associates the ripple voltage ⁇ V with the ripple current I3 can be registered in the control unit 400, and the corresponding ripple current I3 can be calculated from the ripple voltage ⁇ V using the table.
  • a current detector can be placed on the electrical wiring to which the smoothing unit 200 is connected, and the ripple current I3 can be directly detected by the current detector.
  • FIG. 2 is a block diagram showing an example of a hardware configuration for realizing the functions of the control unit 400 according to the first embodiment.
  • a configuration including a processor 91 that performs calculations and a memory 92 in which a program read by the processor 91 is stored can be used.
  • the processor 91 is an example of a computing means.
  • the processor 91 may be a computing means called a microprocessor, a microcomputer, a CPU (Central Processing Unit), or a DSP (Digital Signal Processor).
  • Examples of the memory 92 include non-volatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable ROM), an EEPROM (registered trademark) (Electrically EPROM), a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, and a DVD (Digital Versatile Disc).
  • the memory 92 holds a program that executes the functions of the control unit 400.
  • the processor 91 receives and transmits the necessary information and stores it in the memory 92.
  • the processor 91 executes the program held in the memory 92 and refers to the data and tables stored in the memory 92, thereby enabling the above-mentioned and below-mentioned controls to be executed.
  • the results of calculations by the processor 91 can be stored in the memory 92.
  • the control unit 400 estimates the life of the capacitor 210 based on the ripple current detected by any of the above-mentioned methods. Specifically, the control unit 400 estimates the life of the capacitor 210 by using the correlation between the ripple current and the life of the capacitor 210.
  • FIG. 3 is a diagram showing the correlation between the ripple current and the estimated life used in the control of the first embodiment. The horizontal axis of FIG. 3 indicates the ripple current, and the vertical axis indicates the estimated life. The estimated life is an estimated value of the life of the capacitor 210. The scale of the vertical axis of FIG. 3 is adjusted so that the correlation between the ripple current and the estimated life is linear. Data representing the correlation can be obtained by experiments or the like, and can be stored in the memory 92.
  • FIG. 4 is a flowchart for explaining the control of the first embodiment.
  • the estimated life at ripple current A1 is L1
  • the first threshold for determining whether or not to perform the control of embodiment 1 is Llimit1.
  • control unit 400 determines whether inverter 310 is operating. If inverter 310 is not operating (step S1, No), the process proceeds to step S5. If inverter 310 is operating (step S1, Yes), the process proceeds to step S2.
  • step S2 the control unit 400 calculates the estimated life L1 of the capacitor 210 based on the detected ripple current A1, and then proceeds to step S3.
  • step S3 the control unit 400 determines whether the estimated lifespan L1 is equal to or less than the first threshold Llimit1. If the estimated lifespan L1 exceeds the first threshold Llimit1 (step S3, No), the control unit 400 proceeds to step S5. If the estimated lifespan L1 is equal to or less than the first threshold Llimit1 (step S3, Yes), the control unit 400 proceeds to step S4.
  • step S4 the control unit 400 controls the operation of the inverter 310 so that the estimated life L1 exceeds the first threshold Llimit1.
  • this control is appropriately referred to as the "first control.”
  • the first control reduces the fluctuation range of the amplitude value of the ripple current. Then, the process proceeds to step S5.
  • the power conversion device 1 prioritizes constant current load control that controls the rotation speed of the motor 314, while also implementing load pulsation compensation control that reduces vibrations of the motor 314, and power supply pulsation compensation control that suppresses the fluctuation range of the amplitude value of the ripple current.
  • the q-axis current command is distributed for each compensation control.
  • the power supply pulsation compensation control is prioritized and the distribution ratio for the power supply pulsation compensation control is increased, the fluctuation range of the amplitude value of the ripple current can be reduced.
  • limited operation is performed while implementing such priority control.
  • step S5 the control unit 400 determines whether the power conversion device 1 is in a stopped state, and if it is in a stopped state (step S5, Yes), the flow in FIG. 4 ends. If the power conversion device 1 is in an operating state (step S5, No), the control unit 400 proceeds to step S1 and repeats the process from step S1.
  • step S3 the case where the estimated life L1 is equal to the first threshold Llimit1 is judged as “Yes”, but it may be judged as "No". In other words, the case where the estimated life L1 is equal to the first threshold Llimit1 may be judged as either "Yes” or "No".
  • the control unit 400 provided in the power conversion device 1 detects or calculates the ripple current I3 flowing in and out of the capacitor 210, estimates the lifetime of the capacitor 210 based on the detected or calculated ripple current I3, and, if the estimated lifetime L1 is equal to or less than the first threshold Llimit1, performs a first control to control the operation of the inverter 310 so that the estimated lifetime L1 exceeds the first threshold Llimit1.
  • the rate at which the deterioration of the capacitor 210 progresses can be slowed down, making it possible to appropriately deal with the progression of the deterioration of the capacitor 210. Therefore, by using a power conversion device 1 equipped with such a function, the product lifetime can be extended.
  • Embodiment 2 In the first embodiment, when the estimated life L1 is equal to or less than the first threshold Llimit1, the operation of the inverter 310 is limited, and the inverter 310 is operated so that the estimated life L1 exceeds the first threshold Llimit1.
  • a control is described in which a plurality of thresholds are set and the inverter 310 is gradually limited in operation or stopped. The control in the second embodiment can be implemented using the power conversion device 1 having the configuration shown in FIG. 1.
  • FIG. 5 is a diagram showing the correlation between the ripple current used in the control of embodiment 2 and the estimated lifespan.
  • the horizontal axis of FIG. 5 indicates the ripple current, and the vertical axis indicates the estimated lifespan.
  • the scale of the vertical axis of FIG. 5 is adjusted so that the correlation between the ripple current and the estimated lifespan is linear. Data showing the correlation can be obtained by experiments, etc., and can be stored in memory 92.
  • FIG. 6 is a flowchart for explaining the control of embodiment 2.
  • L1 and Llimit1 have the same meaning as those shown in FIG. 3. Furthermore, Llimit2 is a different determination threshold from the first threshold Llimit1, and is referred to as the "second threshold” in this paper. As shown in FIG. 5, the second threshold Llimit2 is smaller than the first threshold Llimit1.
  • step S6 the control unit 400 determines whether the inverter 310 is operating. If the inverter 310 is not operating (step S6, No), the process proceeds to step S12. If the inverter 310 is operating (step S6, Yes), the process proceeds to step S7.
  • step S7 the control unit 400 calculates the estimated life L1 of the capacitor 210 based on the detected ripple current A1, and then proceeds to step S8.
  • step S8 the control unit 400 determines whether the estimated life L1 is below the second threshold Llimit2. If the estimated life L1 is equal to or greater than the second threshold Llimit2 (step S8, No), the process proceeds to step S10. If the estimated life L1 is below the second threshold Llimit2 (step S8, Yes), the process proceeds to step S9. In step S9, the control unit 400 performs control to stop the operation of the inverter 310. In this document, this control is appropriately referred to as the "second control.” After the second control is performed, the flow in FIG. 6 ends.
  • step S10 the control unit 400 determines whether the estimated lifespan L1 is equal to or less than the first threshold Llimit1. If the estimated lifespan L1 exceeds the first threshold Llimit1 (step S10, No), the process proceeds to step S12. If the estimated lifespan L1 is equal to or less than the first threshold Llimit1 (step S10, Yes), the process proceeds to step S11.
  • step S11 the control unit 400 controls the operation of the inverter 310 so that the estimated life L1 exceeds the first threshold Llimit1. This control is the first control described in the first embodiment. Then, the process proceeds to step S12.
  • step S12 the control unit 400 determines whether the power conversion device 1 is in a stopped state, and if it is in a stopped state (step S12, Yes), ends the flow in FIG. 6. If the power conversion device 1 is in an operating state (step S12, No), the control unit 400 proceeds to step S6 and repeats the process from step S6.
  • step S8 the case where the estimated life L1 is equal to the second threshold Llimit2 is judged as "No", but it may be judged as "Yes”. That is, the case where the estimated life L1 is equal to the second threshold Llimit2 may be judged as either "Yes” or "No”.
  • the case where the estimated life L1 is equal to the first threshold Llimit1 is judged as "Yes", but it may be judged as "No". That is, the case where the estimated life L1 is equal to the first threshold Llimit1 may be judged as either "Yes” or "No".
  • the control unit 400 provided in the power conversion device 1 according to the second embodiment performs the second control to stop the operation of the inverter 310 when the detected or calculated estimated life L1 is equal to or less than the first threshold Llimit1 and falls below the second threshold Llimit2 that is smaller than the first threshold Llimit1, and performs the first control when the estimated life L1 is equal to or greater than the second threshold Llimit2.
  • the first control and the second control are used in combination, so that it is possible to appropriately deal with the progression of deterioration of the capacitor 210 while preventing the capacitor 210 from being damaged due to continued operation.
  • the thresholds to be compared with the estimated life L1 are the first threshold Llimit1 and the second threshold Llimit2 which is smaller than the first threshold Llimit1, but the first threshold Llimit1 itself may be multiple.
  • the first threshold Llimit1 itself may be multiple.
  • Embodiment 3 The power conversion device 1 of embodiment 2 performs control to stop operation of the inverter 310 when the estimated life L1 is equal to or less than the second threshold value Llimit2. In embodiment 3, a power conversion device 1A with further improved usability will be described.
  • FIG. 7 is a diagram showing an example of the configuration of a power conversion device 1A according to embodiment 3.
  • the power conversion device 1A is provided with a user I/F (interface) 600 that includes a display unit 601 and an input unit 602.
  • the power conversion device 1A and the motor 314 provided in the compressor 315 form a motor drive device 2A.
  • the other configurations are the same or equivalent to those of the power conversion device 1, and the same or equivalent components are designated by the same reference numerals, and duplicate explanations will be omitted.
  • FIG. 8 is a flowchart explaining the control of the third embodiment.
  • FIG. 9 is a diagram showing an example of a display screen displayed on the display unit 601 during the control of the third embodiment.
  • step S13 the control unit 400 determines whether the inverter 310 is operating. If the inverter 310 is not operating (step S13, No), the process proceeds to step S21. If the inverter 310 is operating (step S13, Yes), the process proceeds to step S14.
  • step S14 the control unit 400 calculates the estimated life L1 of the capacitor 210 based on the detected ripple current A1, and proceeds to step S15.
  • step S15 the control unit 400 determines whether the estimated life L1 is below the second threshold Llimit2. If the estimated life L1 is equal to or greater than the second threshold Llimit2 (step S15, No), the control unit 400 proceeds to step S19. If the estimated life L1 is below the second threshold Llimit2 (step S15, Yes), the control unit 400 proceeds to step S16.
  • step S16 the control unit 400 displays a selection screen 614 on the display unit 601.
  • the selection screen 614 is shown in FIG. 9.
  • the selection screen 614 displays a message indicating that the capacitor 210 has deteriorated.
  • the selection screen 614 also displays a selection button 614a (a button marked “YES") for selecting to stop the operation of the inverter 310, and a non-selection button 614b (a button marked “NO") for not selecting to stop the operation of the inverter 310.
  • the user can use the selection screen 614 to select whether or not to stop the operation of the inverter 310, that is, whether to stop the operation of the inverter 310 or to continue the operation of the inverter 310.
  • the selection button 614a and the non-selection button 614b are depicted as a touch panel displayed by software processing, but this is not limited to a touch panel, and hardware buttons may also be arranged.
  • step S17 the control unit 400 determines whether the signal notified from the input unit 602 is to stop operation. If the user selects the selection button 614a, i.e., "YES", a signal to stop operation is notified to the control unit 400, and if the user selects the non-selection button 614b, i.e., "NO", a signal to continue operation is notified to the control unit 400. If the signal from the input unit 602 is to stop operation (Yes in step S17), the process proceeds to step S18. If the signal from the input unit 602 is not to stop operation, i.e., to continue operation (No in step S17), the process proceeds to step S21.
  • step S18 the control unit 400 stops the operation of the inverter 310 and ends the flow of FIG. 8.
  • step S19 the control unit 400 determines whether the estimated life L1 is less than or equal to the first threshold Llimit1. If the estimated life L1 exceeds the first threshold Llimit1 (step S19, No), the process proceeds to step S21. If the estimated life L1 is less than or equal to the first threshold Llimit1 (step S19, Yes), the process proceeds to step S20.
  • step S20 the control unit 400 controls the operation of the inverter 310 so that the estimated life L1 exceeds the first threshold Llimit1. This control is the first control described in the first embodiment. Then, the process proceeds to step S21.
  • step S21 the control unit 400 determines whether the power conversion device 1 is in a stopped state, and if it is in a stopped state (step S21, Yes), ends the flow in FIG. 8. If the power conversion device 1 is in an operating state (step S21, No), the control unit 400 proceeds to step S13 and repeats the process from step S13.
  • step S15 when the estimated life L1 is equal to the second threshold Llimit2, the result is determined as “No", but it may be determined as “Yes”. That is, when the estimated life L1 is equal to the second threshold Llimit2, the result may be determined as either "Yes” or “No”.
  • step S19 when the estimated life L1 is equal to the first threshold Llimit1, the result is determined as "Yes", but it may be determined as "No". That is, when the estimated life L1 is equal to the first threshold Llimit1, the result may be determined as either "Yes” or "No".
  • the power conversion device 1A further includes a user I/F 600 having a display unit 601 and an input unit 602.
  • the control unit 400 displays a message on the display unit 601 indicating that the capacitor 210 has deteriorated. This allows the user to recognize that the capacitor 210 has deteriorated, making it possible to accurately grasp the condition of the product.
  • the power conversion device 1A displays on the display unit 601 a selection screen 614 for selecting whether or not to perform a second control for stopping the operation of the inverter 310, and the control unit 400 receives a signal based on the user's selection action via the input unit 602, and can perform the action desired by the user.
  • This improves usability for users who wish to prioritize continued operation over product life. Furthermore, it is possible to extend the product life for users who wish to prioritize product life over continued operation.
  • FIG. 10 is a diagram showing a configuration example of a refrigeration cycle-applied device 900 according to embodiment 4.
  • the refrigeration cycle-applied device 900 according to embodiment 4 includes the power conversion device 1 described in embodiment 1.
  • the refrigeration cycle-applied device 900 according to embodiment 4 can be applied to products including a refrigeration cycle, such as air conditioners, refrigerators, freezers, and heat pump water heaters.
  • a refrigeration cycle such as air conditioners, refrigerators, freezers, and heat pump water heaters.
  • components having the same functions as those in embodiment 1 are denoted by the same reference numerals.
  • the refrigeration cycle application device 900 includes a compressor 315 incorporating the motor 314 in the first embodiment, a four-way valve 902, an indoor heat exchanger 906, an expansion valve 908, and an outdoor heat exchanger 910, which are attached via a refrigerant pipe 912.
  • a compression mechanism 904 that compresses the refrigerant, and a motor 314 that operates the compression mechanism 904.
  • the refrigeration cycle device 900 can perform heating or cooling operation by switching 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, 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, and returns to the compression mechanism 904.
  • the refrigerant is pressurized by the compression mechanism 904 and sent out, 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, and returns 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 reduces the pressure of the refrigerant to expand it.
  • the refrigeration cycle application device 900 according to the fourth embodiment has been described as including the power conversion device 1 described in the first embodiment, but is not limited to this. It may also include the power conversion device 1A shown in FIG. 7. Also, a power conversion device other than the power conversion devices 1 and 1A may be used as long as the control methods of the first to third embodiments can be applied.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Power Conversion In General (AREA)
PCT/JP2023/006164 2023-02-21 2023-02-21 電力変換装置、モータ駆動装置及び冷凍サイクル適用機器 Ceased WO2024176332A1 (ja)

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DE112023005850.4T DE112023005850T5 (de) 2023-02-21 2023-02-21 Leistungswandler, Motorantrieb und Kältekreislaufanwendungsvorrichtung
CN202380086781.8A CN120693782A (zh) 2023-02-21 2023-02-21 电力转换装置、马达驱动装置以及制冷循环应用设备
PCT/JP2023/006164 WO2024176332A1 (ja) 2023-02-21 2023-02-21 電力変換装置、モータ駆動装置及び冷凍サイクル適用機器
JP2025501960A JPWO2024176332A1 (https=) 2023-02-21 2023-02-21

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08196082A (ja) * 1995-01-12 1996-07-30 Toshiba Transport Eng Kk 電力変換装置のフィルタコンデンサ寿命判定装置
JP2007259629A (ja) * 2006-03-24 2007-10-04 Mitsubishi Electric Corp 電動機駆動用電源装置および空気調和装置
JP2008164453A (ja) * 2006-12-28 2008-07-17 Mitsubishi Electric Corp インバータ装置の平滑コンデンサ寿命判定装置
WO2013183118A1 (ja) * 2012-06-05 2013-12-12 三菱電機株式会社 電動機制御装置
JP2020171101A (ja) * 2019-04-02 2020-10-15 三菱重工サーマルシステムズ株式会社 空調システムの制御装置、空調システムの制御方法及びプログラム

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022176193A1 (ja) * 2021-02-22 2022-08-25 三菱電機株式会社 電解コンデンサ寿命判定装置およびモータ駆動装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08196082A (ja) * 1995-01-12 1996-07-30 Toshiba Transport Eng Kk 電力変換装置のフィルタコンデンサ寿命判定装置
JP2007259629A (ja) * 2006-03-24 2007-10-04 Mitsubishi Electric Corp 電動機駆動用電源装置および空気調和装置
JP2008164453A (ja) * 2006-12-28 2008-07-17 Mitsubishi Electric Corp インバータ装置の平滑コンデンサ寿命判定装置
WO2013183118A1 (ja) * 2012-06-05 2013-12-12 三菱電機株式会社 電動機制御装置
JP2020171101A (ja) * 2019-04-02 2020-10-15 三菱重工サーマルシステムズ株式会社 空調システムの制御装置、空調システムの制御方法及びプログラム

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