WO2023067774A1 - 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
WO2023067774A1
WO2023067774A1 PCT/JP2021/038972 JP2021038972W WO2023067774A1 WO 2023067774 A1 WO2023067774 A1 WO 2023067774A1 JP 2021038972 W JP2021038972 W JP 2021038972W WO 2023067774 A1 WO2023067774 A1 WO 2023067774A1
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Prior art keywords
value
control
current
unit
distribution ratio
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PCT/JP2021/038972
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English (en)
French (fr)
Japanese (ja)
Inventor
慎也 豊留
和徳 畠山
翔英 堤
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Priority to CN202180103297.2A priority Critical patent/CN118104121A/zh
Priority to PCT/JP2021/038972 priority patent/WO2023067774A1/ja
Priority to JP2023554188A priority patent/JPWO2023067774A1/ja
Publication of WO2023067774A1 publication Critical patent/WO2023067774A1/ja
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    • 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
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/05—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for damping motor oscillations, e.g. for reducing hunting
    • 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

Definitions

  • the present disclosure relates to a power conversion device, a motor drive device, and a refrigeration cycle application device that convert AC power into desired power.
  • a device such as a motor control device that controls the operation of a motor reduces power consumption by appropriately compensating for the torque pulsation component according to the state of the motor that drives a single rotary compressor, twin rotary compressor, etc. restraining the increase.
  • a technique is disclosed in Patent Document 1.
  • the torque ripple component is compensated for the purpose of reducing power consumption.
  • the current is in an unbalanced state between the positive side and the negative side of the power supply current, which may increase the harmonic components of the power supply current.
  • the load current which is a DC current on the inverter side
  • the smoothing capacitor charges and discharges. Since the amount of charge applied also changes, the current peaks on the positive side and the negative side of the power supply current are different, resulting in an unbalanced waveform, which poses a problem of generation of power supply harmonics. Since power source harmonics can be reduced by reducing load current pulsation, motor control that reduces load current pulsation, that is, load current control is also conceivable.
  • the present disclosure has been made in view of the above, and aims to obtain a power conversion device capable of suppressing the generation of power source harmonics.
  • a power conversion device includes a rectification unit that rectifies first AC power supplied from a commercial power supply, and a rectification unit that is connected to an output end of the rectification unit.
  • a capacitor, an inverter that is connected to both ends of the capacitor to generate a second AC power and output it to the motor, and a constant current load control that controls the rotation speed of the motor are given priority, while suppressing generation of power supply harmonics. and a control device that performs first control and second control to suppress.
  • the power conversion device has the effect of being able to suppress the generation of power source harmonics.
  • FIG. 1 is a diagram showing a configuration example of a power converter according to Embodiment 1;
  • FIG. FIG. 2 is a diagram showing a configuration example of an inverter included in the power converter according to Embodiment 1;
  • FIG. 4 is a diagram showing an example of each detected value when the waveform of the power supply current is not unbalanced in the power converter according to Embodiment 1;
  • FIG. 4 is a diagram showing an example of each detected value when the waveform of the power supply current becomes unbalanced in the power converter according to Embodiment 1;
  • FIG. 2 is a block diagram showing a configuration example of a control device included in the power conversion device according to Embodiment 1;
  • FIG. 3 is a block diagram showing a configuration example of a voltage command value calculation unit included in the control device according to Embodiment 1; 4 is a block diagram showing a configuration example of a ⁇ -axis current command value generation unit provided in the voltage command value calculation unit according to Embodiment 1; FIG. 4 is a flowchart showing the operation of the control device included in the power conversion device according to Embodiment 1;
  • FIG. 2 is a diagram showing an example of a hardware configuration that implements a control device included in the power conversion device according to Embodiment 1;
  • FIG. 10 is a block diagram showing a configuration example of a vibration suppression control unit included in a control device for a power conversion device according to Embodiment 2; FIG.
  • FIG. 11 is a first block diagram showing a configuration example of a load current control unit included in a control device for a power conversion device according to Embodiment 2; A second block diagram showing a configuration example of a load current control section included in a control device for a power conversion device according to Embodiment 2.
  • FIG. 11 is a block diagram showing a configuration example of a distribution ratio determining unit included in a control device for a power conversion device according to Embodiment 3;
  • FIG. 10 is a diagram showing an example of a relational expression representing the relationship between the rotation speed of the motor and the distribution ratio of the setting unit of the distribution ratio determination unit according to the third embodiment;
  • FIG. 11 is a block diagram showing a configuration example of a distribution ratio determining unit included in a control device for a power conversion device according to Embodiment 4;
  • FIG. 12 is a diagram showing an example of a relational expression representing the relationship between the vibration level of the compressor and the distribution ratio, which the setting unit of the distribution ratio determination unit according to Embodiment 4 has; The figure which shows the structural example of the compressor connected to the power converter device which concerns on Embodiment 4.
  • FIG. 11 is a block diagram showing a configuration example of a distribution ratio determining unit included in a control device for a power conversion device according to Embodiment 5;
  • FIG. 10 is a block diagram showing a configuration example of a power supply harmonic standard value calculation unit included in a control device for a power conversion device according to a fifth embodiment
  • FIG. 11 is a block diagram showing a configuration example of an order component calculation unit included in a control device for a power conversion device according to Embodiment 5
  • FIG. 13 is a diagram showing an example of a relational expression indicating the relationship between the power supply harmonic standard value tolerance and the distribution ratio held by the setting unit of the distribution ratio determination unit according to the fifth embodiment
  • FIG. 15 is a block diagram showing a configuration example of a ⁇ -axis current command value generation unit included in a voltage command value calculation unit according to Embodiment 7
  • a power conversion device, a motor drive device, and a refrigeration cycle application device will be described below in detail based on the drawings.
  • FIG. 1 is a diagram showing a configuration example of a power converter 200 according to Embodiment 1.
  • FIG. 2 is a diagram showing a configuration example of the inverter 30 included in the power conversion device 200 according to Embodiment 1.
  • Power converter 200 is connected to commercial power source 1 and compressor 8 .
  • the power conversion device 200 converts the first AC power of the power supply voltage Vs supplied from the commercial power supply 1 into the second AC power having desired amplitude and phase, and supplies the second AC power to the compressor 8 .
  • the power conversion device 200 includes a reactor 2, a rectification unit 3, a smoothing capacitor 5, an inverter 30, a bus voltage detection unit 10, a load current detection unit 40, a power supply current detection unit 50, a control device 100, Prepare.
  • a motor drive device 400 is configured by the power conversion device 200 and the motor 7 included in the compressor 8 .
  • the power supply current detection unit 50 is a detection unit that detects the power supply current Iin of the first AC power supplied from the commercial power supply 1 to the power conversion device 200 and outputs the detected current value to the control device 100 .
  • Reactor 2 is connected between commercial power source 1 and rectifying section 3 .
  • the rectifying section 3 has a bridge circuit composed of rectifying elements 131 to 134, rectifies the first AC power of the power supply voltage Vs supplied from the commercial power supply 1, and outputs it.
  • the rectifier 3 performs full-wave rectification.
  • the smoothing capacitor 5 is a smoothing element that is connected to the output terminal of the rectifier 3 and smoothes the power rectified by the rectifier 3 .
  • the smoothing capacitor 5 is, for example, a capacitor such as an electrolytic capacitor or a film capacitor.
  • the smoothing capacitor 5 has a capacity for smoothing the power rectified by the rectifier 3, and the voltage generated in the smoothing capacitor 5 by the smoothing has a DC component rather than a full-wave rectified waveform of the commercial power supply 1. It has a waveform shape in which a voltage ripple corresponding to the frequency of the commercial power supply 1 is superimposed, and does not pulsate greatly.
  • the frequency of this voltage ripple is a two-fold component of the frequency of the power supply voltage Vs when the commercial power supply 1 is single-phase, and a six-fold component is the main component when the commercial power supply 1 is three-phase. If the power input from commercial power supply 1 and the power output from inverter 30 do not change, the amplitude of this voltage ripple is determined by the capacity of smoothing capacitor 5 . For example, it pulsates in such a range that the maximum value of the voltage ripple generated in the smoothing capacitor 5 is less than twice the minimum value.
  • the bus voltage detection unit 10 is a detection unit that detects the voltage across the smoothing capacitor 5 , that is, the voltage across the DC buses 12 a and 12 b as a bus voltage Vdc , and outputs the detected voltage value to the control device 100 .
  • Load current detection unit 40 is a detection unit that detects load current Idc , which is a direct current flowing into inverter 30 from smoothing capacitor 5 , and outputs the detected current value to control device 100 .
  • the inverter 30 is connected across the smoothing capacitor 5 and converts the power output from the rectifier 3 and the smoothing capacitor 5 into second AC power having a desired amplitude and phase, that is, generates the second AC power. and output to the motor 7. Specifically, inverter 30 receives bus voltage Vdc , generates a three-phase AC voltage with variable frequency and voltage value, and supplies it to motor 7 via output lines 331-333.
  • the inverter 30 includes an inverter main circuit 310 and a drive circuit 350, as shown in FIG. Input terminals of the inverter main circuit 310 are connected to the DC buses 12a and 12b.
  • the inverter main circuit 310 includes switching elements 311-316. Freewheeling rectifying elements 321 to 326 are connected in anti-parallel to the switching elements 311 to 316, respectively.
  • the drive circuit 350 generates drive signals Sr1-Sr6 based on PWM (Pulse Width Modulation) signals Sm1-Sm6 output from the control device 100.
  • PWM Pulse Width Modulation
  • the drive circuit 350 controls on/off of the switching elements 311-316 by the drive signals Sr1-Sr6.
  • the inverter 30 can supply the three-phase AC voltage with variable frequency and variable voltage to the motor 7 via the output lines 331-333.
  • the PWM signals Sm1 to Sm6 are signals having a logic circuit signal level, that is, a magnitude of 0V to 5V.
  • the PWM signals Sm1 to Sm6 are signals having the ground potential of the control device 100 as a reference potential.
  • the driving signals Sr1 to Sr6 are signals having voltage levels necessary to control the switching elements 311 to 316, eg, -15V to +15V.
  • the drive signals Sr1 to Sr6 are signals having the potential of the negative terminal, that is, the emitter terminal of the corresponding switching elements 311 to 316 as a reference potential.
  • the compressor 8 is a load having a motor 7 for driving compression.
  • the motor 7 rotates according to the amplitude and phase of the second AC power supplied from the inverter 30 and performs compression operation.
  • the load torque of the compressor 8 can often be regarded as a constant torque load.
  • FIG. 1 shows a case where the motor windings are Y-connected, but this is an example and is not limited to this.
  • the motor windings of the motor 7 may be delta-connection, or may be switchable between Y-connection and delta-connection.
  • the compressor 8 is assumed to be a single rotary compressor, a scroll compressor, or the like, but is not limited to these.
  • 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 2 may be arranged after the rectifying section 3 .
  • the power conversion device 200 may include a booster section, or the rectifier section 3 may have the function of the booster section.
  • the bus voltage detection section 10, the load current detection section 40, and the power supply current detection section 50 may be collectively referred to as a detection section.
  • the voltage value detected by the bus voltage detector 10, the current value detected by the load current detector 40, and the current value detected by the power supply current detector 50 are sometimes referred to as detected values.
  • Control device 100 acquires bus voltage Vdc from bus voltage detection unit 10 , load current Idc from load current detection unit 40 , and power supply current Iin from power supply current detection unit 50 .
  • Control device 100 controls the operation of inverter main circuit 310, specifically, the on/off of switching elements 311 to 316 included in inverter main circuit 310, using the detection values detected by the respective detection units.
  • control device 100 controls the operation of inverter 30 so as to suppress the generation of power source harmonics generated in power conversion device 200 . It should be noted that the control device 100 does not have to use all the detection values acquired from each detection unit, and may perform control using some of the detection values.
  • the control device 100 controls the operation of the inverter 30 so that the rotation speed of the motor 7 becomes a desired rotation speed. Performs constant current load control.
  • the control device 100 compensates the output torque of the power conversion device 200 so as to match the load torque of the compressor 8, and performs vibration suppression control to suppress the vibration. .
  • the load current Idc pulsates due to the influence of vibration suppression control or the like, the amount of charge charged and discharged by the smoothing capacitor 5 also changes. The peaks are different, resulting in an unbalanced waveform, and the generation of power supply harmonics becomes a problem.
  • FIG. 3 is a diagram showing an example of detected values when the waveform of the power supply current Iin is not unbalanced in the power converter 200 according to Embodiment 1.
  • FIG. 4 is a diagram showing an example of detected values when the waveform of the power supply current Iin becomes unbalanced in the power converter 200 according to the first embodiment. 3 and 4, the first stage shows the waveform of the power supply voltage Vs , the second stage shows the waveform of the power supply current Iin , and the third stage shows the waveform of the load current Idc . In each waveform, the horizontal axis indicates time. As is clear from the relationships of FIGS.
  • control device 100 can suppress the generation of power source harmonics by reducing the pulsation of the load current Idc . , that is, load current control is performed.
  • control device 100 performs vibration suppression control and load current control while performing constant current load control.
  • one of vibration suppression control and load current control may be referred to as first control, and the other may be referred to as second control.
  • at least one of the first control and the second control is control for suppressing generation of power source harmonics. That is, the control device 100 performs the first control and the second control so as to suppress the generation of power source harmonics while giving priority to the constant current load control for controlling the rotation speed of the motor 7 .
  • the first control is vibration suppression control for reducing vibration of the motor 7, and the second control is to set the load current Idc , which is the output current of the smoothing capacitor 5, to a desired value. It is assumed that the load current control is such that the load current is controlled so as to be close to each other.
  • the control device 100 sets the current limit value of the ⁇ -axis current command value that can be used in each control of constant current load control, vibration suppression control, and load current control. Specifically, the control device 100 gives priority to constant current load control because it is essential for the power conversion device 200 that controls the operation of the inverter 30 to drive the motor 7 to follow the speed command.
  • the control device 100 performs vibration suppression control and load current control within a range obtained by subtracting the ⁇ -axis current command value used in constant current load control from the ⁇ -axis current limit value, which is the current limit value for the entire ⁇ -axis current command value. to generate a ⁇ -axis current command value for vibration suppression control and a ⁇ -axis current command value for load current control.
  • the control device 100 preferentially performs constant current load control for controlling the rotation speed of the motor 7, and performs vibration suppression control for reducing vibration of the motor 7 and load current control for reducing pulsation of the load current Idc .
  • the distribution ratio K margin of the ⁇ -axis current command value for vibration suppression control and load current control is determined.
  • control device 100 performs control in a rotating coordinate system having ⁇ -axes and ⁇ -axes.
  • ⁇ -axis current, ⁇ -axis voltage, etc. may be referred to as excitation current, excitation voltage, etc.
  • ⁇ -axis current, ⁇ -axis voltage, etc. may be referred to as torque current, torque voltage, etc.
  • the overall ⁇ -axis current limit value i ⁇ _lim changes depending on the value of the exciting current i ⁇ , the speed of the motor 7, and the like. From the viewpoint of the demagnetization limit of the motor 7 in the low-speed range, the maximum current of the inverter 30, and the like, the ⁇ -axis current limit value i ⁇ _lim is determined, for example, as shown in Equation (1).
  • i rmslim represents the limit value of the phase current expressed in rms
  • i ⁇ * represents the ⁇ -axis current command value.
  • i rmslim is set 10% to 20% lower than the threshold value of the hardware overcurrent cutoff protection of the inverter 30 .
  • the ⁇ -axis current that can flow decreases due to the influence of voltage saturation. It is well known that when the ⁇ -axis current command value becomes excessively large, the control may become unstable due to the windup phenomenon of the integrator. Since the equation (1) does not take into consideration the decrease in the maximum ⁇ -axis current due to the speed increase, a mathematical expression that takes into account the decrease in the maximum ⁇ -axis current is derived.
  • V om when the limit value of the ⁇ -axis voltage is V om , the relationship of the approximation formula (2) holds for V om .
  • the ⁇ -axis current limit value i ⁇ _lim is expressed as shown in Equation (4).
  • Equation (6) the ⁇ -axis current limit value i ⁇ _lim is set as shown in Equation (6), taking into account both Equations (1) and (4).
  • MIN is a function that selects the minimum.
  • FIG. 5 is a block diagram showing a configuration example of the control device 100 included in the power conversion device 200 according to Embodiment 1. As shown in FIG.
  • the control device 100 includes an operation control section 102 and an inverter control section 110 .
  • the operation control unit 102 receives command information Q e from the outside and generates a frequency command value ⁇ e * based on the command information Q e .
  • the frequency command value ⁇ e * is obtained by multiplying the rotational angular velocity command value ⁇ m * , which is the command value for the rotational speed of the motor 7, by the number of pole pairs P m of the motor 7, as shown in the following equation (7). be able to.
  • the control device 100 controls the operation of each part of the air conditioner based on the command information Qe .
  • the command information Qe includes, for example, a temperature detected by a temperature sensor (not shown), information indicating a set temperature instructed by a remote controller (not shown), operation mode selection information, operation start and operation end instruction information, and the like. is.
  • the operation modes are, for example, heating, cooling, and dehumidification.
  • the operation control unit 102 may be outside the control device 100 . That is, control device 100 may be configured to acquire frequency command value ⁇ e * from the outside.
  • the inverter control unit 110 includes a current restoration unit 111, a three-phase to two-phase conversion unit 112, an excitation current command value generation unit 113, a voltage command value calculation unit 115, an electric phase calculation unit 116, and a two-to-three phase conversion unit.
  • a section 117 and a PWM signal generation section 118 are provided.
  • a current restoration unit 111 restores the phase currents i u , iv , and i w flowing through the motor 7 based on the load current I dc detected by the load current detection unit 40 .
  • Current restoration unit 111 samples load current Idc detected by load current detection unit 40 at timing determined based on PWM signals Sm1 to Sm6 generated by PWM signal generation unit 118, thereby obtaining phase current i u , i v , i w can be recovered.
  • the three-phase to two-phase conversion unit 112 converts the phase currents i u , iv , and i w restored by the current restoration unit 111 to the ⁇ -axis using the electric phase ⁇ e generated by the electric phase calculation unit 116 described later.
  • An excitation current i ⁇ that is a current and a torque current i ⁇ that is a ⁇ -axis current, that is, are converted into current values of the ⁇ -axis.
  • the excitation current command value generator 113 generates the excitation current command value i ⁇ * in the above-described rotating coordinate system. Specifically, the excitation current command value generation unit 113 obtains the optimum excitation current command value i ⁇ * for driving the motor 7 with the highest efficiency based on the torque current i ⁇ . Based on the torque current i ⁇ , the excitation current command value generator 113 generates a current phase at which the output torque Tm of the motor 7 becomes a specified value or more or a maximum value, that is, the current value becomes a specified value or less or a minimum value. An exciting current command value i ⁇ * that becomes ⁇ m is output.
  • the excitation current command value generator 113 obtains the excitation current command value i ⁇ * based on the torque current i ⁇ , but this is an example and the present invention is not limited to this. Even if the excitation current command value generator 113 obtains the excitation current command value i ⁇ * based on the excitation current i ⁇ , the frequency command value ⁇ e * , etc., the same effect can be obtained. Further, the excitation current command value generator 113 may determine the excitation current command value i ⁇ * by flux weakening control or the like. In the following description, the exciting current command value may be referred to as the ⁇ -axis current command value.
  • the voltage command value calculation unit 115 calculates the load current I dc obtained from the load current detection unit 40, the power supply current I in obtained from the power supply current detection unit 50, and the frequency command value ⁇ e * obtained from the operation control unit 102. , based on the excitation current i ⁇ and the torque current i ⁇ obtained from the three-phase to two-phase conversion unit 112 and the excitation current command value i ⁇ * obtained from the excitation current command value generation unit 113, the ⁇ -axis voltage command value V ⁇ * and ⁇ -axis voltage command values V ⁇ * are generated.
  • the voltage command value calculation unit 115 calculates the frequency estimated value ⁇ est based on the ⁇ -axis voltage command value V ⁇ * , the ⁇ -axis voltage command value V ⁇ * , the excitation current i ⁇ , and the torque current i ⁇ . to estimate
  • the electric phase calculation unit 116 calculates the electric phase ⁇ e by integrating the frequency estimation value ⁇ est acquired from the voltage command value calculation unit 115 .
  • Two-to-three phase converter 117 converts ⁇ -axis voltage command value V ⁇ * and ⁇ -axis voltage command value V ⁇ * obtained from voltage command value calculator 115, that is, voltage command values in a two-phase coordinate system, to electrical phase calculation.
  • the electric phase ⁇ e acquired from the unit 116 the three-phase voltage command values V u * , V v * , V w *, which are the output voltage command values in the three-phase coordinate system, are converted.
  • PWM signal generation unit 118 converts three-phase voltage command values V u * , V v * , V w * obtained from two-to-three phase conversion unit 117 and bus voltage V dc detected by bus voltage detection unit 10. The comparison generates PWM signals Sm1-Sm6. The PWM signal generator 118 can also stop the motor 7 by not outputting the PWM signals Sm1 to Sm6.
  • FIG. 6 is a block diagram showing a configuration example of voltage command value calculation section 115 included in control device 100 according to the first embodiment.
  • Voltage command value calculation unit 115 includes frequency estimation unit 501, distribution ratio determination unit 502, ⁇ -axis current command value generation unit 503, subtraction units 509 and 510, ⁇ -axis current control unit 511, and ⁇ -axis current control. a portion 512;
  • the frequency estimator 501 calculates the frequency of the voltage supplied to the motor 7 based on the excitation current i ⁇ , the torque current i ⁇ , the ⁇ -axis voltage command value V ⁇ * , and the ⁇ -axis voltage command value V ⁇ *. is estimated and output as the frequency estimate ⁇ est .
  • Distribution ratio determination unit 502 determines frequency estimated value ⁇ est , power supply current I in , frequency command value ⁇ e * , excitation current i ⁇ , torque current i ⁇ , ⁇ -axis voltage command value V ⁇ * , and ⁇ -axis voltage command value.
  • V ⁇ * are used to determine and output the distribution ratio K margin .
  • the distribution ratio K margin is a variable of 0 or more and 1 or less.
  • a ⁇ -axis current command value generation unit 503 generates a torque current command value in the above-described rotating coordinate system. Specifically, the ⁇ -axis current command value generation unit 503 performs proportional integral calculation , that is , PI (Proportional Integral) control is performed to obtain an intermediate torque current command value i ⁇ * that makes the difference ( ⁇ e * - ⁇ est ) close to zero. The ⁇ -axis current command value generation unit 503 generates the intermediate torque current command value i ⁇ * in this manner, thereby performing control for matching the frequency estimation value ⁇ est with the frequency command value ⁇ e * .
  • proportional integral calculation that is , PI (Proportional Integral) control is performed to obtain an intermediate torque current command value i ⁇ * that makes the difference ( ⁇ e * - ⁇ est ) close to zero.
  • the ⁇ -axis current command value generation unit 503 generates the intermediate torque current command value i ⁇ * in this manner, thereby performing control for matching the frequency
  • the ⁇ -axis current command value generation unit 503 limits the intermediate torque current command value i ⁇ * using the overall ⁇ -axis current limit value i ⁇ _lim , and the ⁇ -axis current command value for constant current load control, i.
  • a ⁇ -axis current command value i ⁇ _sp of 1 is generated.
  • the ⁇ -axis current command value generation unit 503 uses the distribution ratio K margin to generate a first compensation value i ⁇ AVS that is the ⁇ -axis current command value for vibration suppression control, and the ⁇ -axis current command value for load current control.
  • a second compensation value i ⁇ lcc which is a current command value, is generated.
  • the ⁇ -axis current command value generation unit 503 uses the first ⁇ -axis current command value i ⁇ _sp , the first compensation value i ⁇ AVS , and the second compensation value i ⁇ lcc to generate the second torque current command value as the torque current command value. is generated and output.
  • the subtraction unit 509 calculates the difference (i ⁇ * ⁇ i ⁇ ) of the excitation current i ⁇ with respect to the excitation current command value i ⁇ * .
  • Subtraction unit 510 calculates a difference (i ⁇ *** - i ⁇ ) of torque current i ⁇ with respect to second ⁇ -axis current command value i ⁇ *** .
  • the ⁇ -axis current control unit 511 performs a proportional integral operation on the difference (i ⁇ * ⁇ i ⁇ ) calculated by the subtraction unit 509 to bring the difference (i ⁇ * ⁇ i ⁇ ) close to zero.
  • a command value V ⁇ * is generated.
  • the ⁇ -axis current control unit 511 generates the ⁇ -axis voltage command value V ⁇ * in this manner, thereby performing control to match the excitation current i ⁇ with the excitation current command value i ⁇ * .
  • a ⁇ -axis current control unit 512 performs a proportional integral operation on the difference (i ⁇ *** - i ⁇ ) calculated by the subtraction unit 510 to set the difference (i ⁇ *** - i ⁇ ) to zero.
  • a ⁇ -axis voltage command value V ⁇ * for approaching is generated.
  • the ⁇ -axis current control unit 512 controls the torque current i ⁇ to match the second ⁇ -axis current command value i ⁇ *** . I do.
  • FIG. 7 is a block diagram showing a configuration example of ⁇ -axis current command value generation section 503 included in voltage command value calculation section 115 according to the first embodiment.
  • the ⁇ -axis current command value generation unit 503 includes a speed control unit 710, a subtraction unit 721, a distribution ratio multiplication unit 722, a vibration suppression control unit 723, a subtraction unit 731, a load current control unit 732, and a ⁇ -axis current and a command value calculation unit 740 .
  • the speed control section 710 includes a subtraction section 711 , a proportional control section 712 , an integral control section 713 , an addition section 714 and a limit section 715 .
  • Limiting unit 715 includes storage unit 716 , selecting unit 717 , and limiter 718 .
  • the ⁇ -axis current command value calculator 740 includes adders 741 and 742 .
  • the subtraction unit 711 calculates the difference ( ⁇ e * ⁇ est ) between the frequency command value ⁇ e * and the frequency estimation value ⁇ est estimated by the frequency estimation unit 501 .
  • Proportional control section 712 performs proportional control on the difference ( ⁇ e * - ⁇ est ) between frequency command value ⁇ e * and frequency estimated value ⁇ est obtained from subtraction section 711, and converts proportional term i ⁇ _p * to Output.
  • Integral control section 713 performs integral control on the difference ( ⁇ e * - ⁇ est ) between frequency command value ⁇ e * and frequency estimated value ⁇ est acquired from subtraction section 711, and converts integral term i ⁇ _i * to Output.
  • Addition unit 714 adds proportional term i ⁇ _p * obtained from proportional control unit 712 and integral term i ⁇ _i * obtained from integral control unit 713 to generate intermediate torque current command value i ⁇ * .
  • the storage unit 716 stores the ⁇ -axis current limit values i ⁇ _lim1 and i ⁇ _lim2 . That is, the limiting unit 715 has ⁇ -axis current limit values i ⁇ _lim1 and i ⁇ _lim2 .
  • One of the ⁇ -axis current limit values i ⁇ _lim1 and i ⁇ _lim2 is the ⁇ -axis current limit value represented by Equation (1), and the other is the ⁇ -axis current limit value represented by Equation (2).
  • the selection unit 717 selects one of the ⁇ -axis current limit values i ⁇ _lim1 and i ⁇ _lim2 stored in the storage unit 716 and outputs it as the ⁇ -axis current limit value i ⁇ _lim .
  • the selection unit 717 performs calculation according to Equation (6).
  • the ⁇ -axis current limit value i ⁇ _lim is a current limit value for the second ⁇ -axis current command value i ⁇ *** .
  • a limiter 718 limits the intermediate torque current command value i ⁇ * with a ⁇ -axis current limit value i ⁇ _lim to obtain a first ⁇ -axis current command value i ⁇ _sp which is a ⁇ -axis current command value for constant current load control.
  • the limiting unit 715 may store the ⁇ -axis current limit values i ⁇ _lim1 and i ⁇ _lim2 calculated by itself in the storage unit 716 , or may obtain them from the outside, for example, the operation control unit 102 . may be stored in the storage unit 716.
  • the ⁇ -axis current limit value i ⁇ _lim may be referred to as a first current limit value i ⁇ _lim .
  • speed control unit 710 generates first ⁇ -axis current command value i ⁇ _sp , which is a ⁇ -axis current command value for constant current load control in a rotating coordinate system having ⁇ -axis and ⁇ -axis.
  • a subtraction unit 721 subtracts the absolute value of the first ⁇ -axis current command value i ⁇ _sp from the above-described first current limit value i ⁇ _lim to generate a ⁇ -axis current margin i ⁇ _margin , which is the difference.
  • the ⁇ -axis current margin i ⁇ _margin is the remainder obtained by subtracting the current of the first ⁇ -axis current command value i ⁇ _sp necessary for constant current load control from the first current limit value i ⁇ _lim , and is used for vibration suppression control and load control. This is the amount of current that can be distributed for current control.
  • subtraction unit 721 uses a low-pass filter to smooth the ⁇ -axis current margin i ⁇ _margin as shown in equation (8). can be calculated.
  • T is the filter time constant, which is the reciprocal of the cutoff angular frequency
  • s is the Laplace transform variable
  • the distribution ratio multiplier 722 multiplies the ⁇ -axis current margin i ⁇ _margin by the distribution ratio K margin , as shown in equation (9), to obtain a current limit value for the vibration suppression control unit 723, that is, for vibration suppression control. Generate a second current limit value i ⁇ limAVS .
  • the distribution ratio K margin indicates the distribution ratio of the ⁇ -axis current margin i ⁇ _margin , and is a variable between 0 and 1 determined by the distribution ratio determination unit 502 as described above. That is, the second current limit value i ⁇ limAVS is a value obtained by multiplying the ⁇ -axis current margin i ⁇ _margin and the distribution ratio K margin between 0 and 1 inclusive.
  • the vibration suppression control unit 723 uses the estimated frequency value ⁇ est and the second current limit value i ⁇ limAVS for vibration suppression control to determine the first compensation value I ⁇ AVS which is the ⁇ -axis current command value for vibration suppression control. to generate Note that the vibration suppression control unit 723 can perform vibration suppression control on a desired frequency component by using the frequency estimation value ⁇ est , but the details will be described later in the embodiment.
  • the vibration suppression control unit 723 controls the difference ⁇ Using the second current limit value i ⁇ limAVS set using the axis current margin i ⁇ _margin and the distribution ratio Kmargin of the ⁇ -axis current margin i ⁇ _margin , the second current limit value i ⁇ limAVS , which is the ⁇ -axis current command value for vibration suppression control, is calculated. Generate a compensation value i ⁇ AVS of 1.
  • the subtraction unit 731 calculates the difference between the ⁇ -axis current margin i ⁇ _margin acquired from the subtraction unit 721 and the first compensation value i ⁇ AVS , which is the ⁇ -axis current command value for vibration suppression control, as shown in equation (10).
  • the calculated difference is output to the load current control unit 732, that is, as the third current limit value i ⁇ limlcc which is the current limit value for load current control.
  • the vibration suppression control unit 723 performs vibration suppression control within the range of the second current limit value i ⁇ limAVS .
  • the third current limit value i ⁇ limlcc which is the current limit value for load current control, is expressed as shown in equation (10). be.
  • the third current limit value i ⁇ limlcc is a value obtained by subtracting the first compensation value i ⁇ AVS from the ⁇ -axis current margin i ⁇ _margin .
  • the load current control unit 732 uses the load current Idc , the first ⁇ -axis current command value i ⁇ _sp , and the third current limit value i ⁇ limlcc , which is the current limit value for load current control, to control the load current
  • a second compensation value i ⁇ lcc that is a ⁇ -axis current command value for control is generated. Specifically, the load current control unit 732 determines the second compensation value I ⁇ lcc as in equation (12).
  • the load current control unit 732 can perform load current control targeting a desired frequency component. Details will be described later in the embodiment. In this way, the load current control unit 732 uses the third current limit value i ⁇ limlcc set using the ⁇ -axis current margin i ⁇ _margin and the first compensation value i ⁇ AVS to determine the ⁇ A second compensation value i ⁇ lcc , which is a shaft current command value, is generated.
  • the adder 741 adds the first ⁇ -axis current command value i ⁇ _sp and the first compensation value i ⁇ AVS , which is the ⁇ -axis current command value for vibration suppression control.
  • the addition unit 742 adds the first ⁇ -axis current command value i ⁇ _sp + the first compensation value i ⁇ AVS which is the addition result of the addition unit 741, and the second compensation value which is the ⁇ -axis current command value for load current control. Add i ⁇ lcc .
  • the ⁇ -axis current command value calculator 740 outputs the addition result of the adder 742 as the second ⁇ -axis current command value i ⁇ *** .
  • the ⁇ -axis current command value calculation unit 740 calculates the second ⁇ -axis current using the first ⁇ -axis current command value i ⁇ _sp , the first compensation value i ⁇ AVS , and the second compensation value i ⁇ lcc . Generate a command value i ⁇ *** .
  • the control device 100 sets an appropriate distribution ratio K margin according to the operating state of the motor 7, thereby following the speed command, i.e. giving priority to constant current load control, while suppressing the vibration. Suppression control and load current control can be performed appropriately.
  • the control device 100 uses the distribution ratio K margin to generate the second current limit value i ⁇ limAVS for vibration suppression control, and the ⁇ -axis current margin i ⁇ _margin and the second current limit value i ⁇ _margin for vibration suppression control.
  • the third current limit value i ⁇ limlcc for load current control is generated from the difference from the compensation value i ⁇ AVS of 1, the present invention is not limited to this.
  • the control device 100 replaces the arrangement of the vibration suppression control section 723 and the load current control section 732 in FIG .
  • the second current limit value i ⁇ limAVS for vibration suppression control may be generated from the difference between the current margin i ⁇ _margin and the second compensation value i ⁇ lcc for load current control.
  • the distribution ratio multiplier 722 multiplies the ⁇ -axis current margin i ⁇ _margin and the distribution ratio K margin to generate the second current limit value i ⁇ limAVS for vibration suppression control.
  • the second current limit value i ⁇ limAVS is a value obtained by multiplying the ⁇ -axis current margin i ⁇ _margin by the distribution ratio K margin of 0 or more and 1 or less.
  • the third current limit value i ⁇ limlcc for load current control is a value obtained by subtracting the first compensation value i ⁇ AVS from the ⁇ -axis current margin i ⁇ _margin .
  • the load current control unit 732 sets the third current limit value i ⁇ limlcc as the second compensation value i ⁇ lcc . select. Further, when the third current limit value i ⁇ limlcc is greater than the absolute value of the first ⁇ -axis current command value i ⁇ _sp , the load current control unit 732 sets the second compensation value i ⁇ lcc to the first ⁇ -axis current command value. Choose the absolute value of the value i ⁇ _sp .
  • the vibration suppression control section 723 and the load current control section 732 are exchanged with respect to FIG .
  • Generate a third current limit value i ⁇ limlcc for current control
  • the third current limit value i ⁇ limlcc is a value obtained by multiplying the ⁇ -axis current margin i ⁇ _margin by the distribution ratio K margin of 0 or more and 1 or less.
  • the second current limit value i ⁇ limAVS is a value obtained by subtracting the second compensation value i ⁇ lcc from the ⁇ -axis current margin i ⁇ _margin .
  • the vibration suppression control unit 723 sets the second current limit value i ⁇ limAVS as the first compensation value i ⁇ AVS . select. Further, when the second current limit value i ⁇ limAVS is larger than the absolute value of the first ⁇ -axis current command value i ⁇ _sp , the vibration suppression control unit 723 sets the first ⁇ -axis current command value as the first compensation value i ⁇ AVS . Choose the absolute value of the value i ⁇ _sp .
  • FIG. 8 is a flow chart showing the operation of the control device 100 included in the power converter 200 according to the first embodiment.
  • the speed control unit 710 uses the first current limit value i ⁇ _lim to generate the first ⁇ -axis current command value i ⁇ _sp for constant current load control (step S1).
  • the subtractor 721 generates a ⁇ -axis current margin i ⁇ _margin , which is the difference between the first current limit value i ⁇ _lim and the absolute value of the first ⁇ -axis current command value i ⁇ _sp (step S2).
  • the distribution ratio multiplier 722 multiplies the ⁇ -axis current margin i ⁇ _margin and the distribution ratio K margin to generate a second current limit value i ⁇ limAVS for vibration suppression control (step S3).
  • the vibration suppression control unit 723 performs vibration suppression control within the range of the second current limit value i ⁇ limAVS for vibration suppression control, and generates a first compensation value i ⁇ AVS for vibration suppression control (step S4). .
  • the subtractor 731 generates the third current limit value i ⁇ limlcc for load current control, which is the difference between the ⁇ -axis current margin i ⁇ _margin and the first compensation value i ⁇ AVS for vibration suppression control (step S5).
  • the load current control unit 732 uses the third current limit value i ⁇ limlcc for load current control to generate the second compensation value i ⁇ lcc for load current control (step S6).
  • the ⁇ -axis current command value calculation unit 740 adds the first ⁇ -axis current command value i ⁇ _sp , the first compensation value i ⁇ AVS for vibration suppression control, and the second compensation value i ⁇ lcc for load current control. to generate a second ⁇ -axis current command value i ⁇ *** (step S7).
  • FIG. 9 is a diagram showing an example of a hardware configuration that implements the control device 100 included in the power conversion device 200 according to Embodiment 1. As shown in FIG. Control device 100 is implemented by processor 91 and memory 92 .
  • the processor 91 is a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, processor, DSP (Digital Signal Processor)), or a 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 Erasable Programmable Read Only Memory) or a volatile non-volatile Read Only memory.
  • a semiconductor memory can be exemplified.
  • 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 Versatile Disc).
  • the control device 100 uses the constant current load control from the first current limit value i ⁇ _lim which is the overall ⁇ -axis current limit value. Within the range obtained by subtracting the value of the first ⁇ -axis current command value i ⁇ _sp , for vibration suppression control and load current control, according to the distribution ratio K margin of the ⁇ -axis current for each control of vibration suppression control and load current control. Each current limit value was set, and each control of vibration suppression control and load current control was performed. As a result, the power conversion device 200 can suppress the generation of power supply harmonics due to the unbalanced waveform of the power supply current Iin .
  • the power conversion device 200 preferentially performs constant current load control for controlling the rotation speed of the motor 7, vibration suppression control for reducing vibration of the motor 7, and load current I, which is the output current of the smoothing capacitor 5.
  • Load current control that controls dc to approach a desired value can be performed according to the distribution ratio K margin of the ⁇ -axis current for vibration suppression control and load current control.
  • the control device 100 uses the ⁇ -axis current, which is a reactive current, instead of the ⁇ -axis current, which is an active current, and utilizes the change in active power due to the winding resistance of the motor 7 to convert the inverter
  • the load current Idc which is the DC current flowing into the circuit 30
  • a specified value that is, a constant value
  • Embodiment 2 In the power conversion device 200, the frequency of the power harmonics generated by the unbalanced waveform of the power supply current Iin is not a constant frequency, but the power supply frequency of the commercial power supply 1, the operating frequency based on the rotation speed of the motor 7, that is, the machine It changes depending on the frequency, etc. It is also assumed that power source harmonics are generated in a plurality of orders.
  • Embodiment 2 describes a case where control device 100 of power conversion device 200 performs vibration suppression control and load current control for a specific frequency.
  • the configuration of power converter 200 is the same as the configuration of power converter 200 in Embodiment 1 shown in FIG.
  • the load current Idc to be controlled by the load current control unit 732 of the control device 100 will be described.
  • P motor is the power consumed by the motor 7
  • v ⁇ is the ⁇ -axis voltage
  • i ⁇ is the ⁇ -axis current
  • v ⁇ is the ⁇ -axis voltage
  • i ⁇ is the ⁇ -axis current
  • Ra is the phase resistance of the motor 7
  • ⁇ e is Let the electrical angular frequency
  • L ⁇ be the ⁇ -axis inductance of the motor 7
  • L ⁇ be the ⁇ -axis inductance of the motor 7
  • ⁇ a be the induced voltage constant
  • P dc be the power on the bus side of the inverter 30, and
  • V dc be the supplementary voltage.
  • Equation (14) is obtained.
  • equation (15) is obtained by approximating P motor by P dc in equation (14).
  • the compressor 8 When the compressor 8 is a motor load such as a single rotary compressor, a scroll compressor, or the like, in which load torque pulsation occurs once in one cycle of the mechanical angle, the most dominant frequency component of the load current Idc is the motor load. It is the first component of the machine frequency, which is the operating frequency of 7.
  • the n-fold component of the mechanical frequency is referred to as mechanical nf.
  • the first component of the machine frequency becomes machine 1f.
  • n is an integer of 1 or more.
  • the frequency at which a component appears in the load current Idc although not as dominant as the machine 1f, is given by equation (16).
  • the power supply frequency is the power supply frequency of the commercial power supply 1 and is generally 50 Hz or 60 Hz.
  • m is an integer greater than or equal to 1 to represent an integral multiple of the power supply frequency.
  • the m-fold component of the power supply frequency will be referred to as the power supply mf.
  • the 1-fold component of the power supply frequency is the power supply 1f.
  • control device 100 may grasp the power supply frequency of the commercial power supply 1 from the value of the power supply current Iin acquired from the power supply current detection unit 50, or the value of the load current Idc acquired from the load current detection unit 40. It may be grasped from the value and the control contents for the inverter 30, or if the commercial power supply 1 to be connected is fixed, information on the power supply frequency of the commercial power supply 1 may be held in advance. Further, the control device 100 can grasp the mechanical frequency, which is the operating frequency of the motor 7 , from the details of control over the inverter 30 .
  • the load current control section 732 may change the control target, that is, the frequency component to be compensated, according to the rotation speed of the motor 7 .
  • the machine 2f increases as the motor 7 speed increases, and
  • the load current control unit 732 performs load current control on the machine 1f, the machine 2f, and the like, and controls the rotation speed of the motor 7.
  • load current control is performed for the machine 1f,
  • the load current control section 732 may use a threshold value to determine whether the rotational speed of the motor 7 is high or low.
  • the load current control unit 732 can determine whether the rotational speed of the motor 7 is high or low using the mechanical frequency at which the magnitude relationship between the machine 2f and
  • the control device 100 determines whether the rotation speed of the motor 7 is high or low by not only the load current control unit 732 but also by the speed control unit 710 and the vibration suppression control unit 723 together with the load current control unit 732 . etc. may be carried out in cooperation with each other.
  • the vibration suppression control unit 723 suppresses vibration when the compressor 8 is a motor load such as a single rotary compressor, a scroll compressor, or the like, in which load torque pulsation occurs once in one cycle of the mechanical angle. It is ideal to compensate for the mechanical 1f component as suppression control. However, there is a trade-off between vibration suppression control and load current control. For example, when the vibration suppression control unit 723 performs vibration suppression control on the machine 1f component, the load current Idc pulsates in the machine 1f. The control device 100 cannot perform vibration suppression control for the machine 1f by the vibration suppression control section 723 and load current control for the machine 1f by the load current control section 732 at the same time.
  • each control targets different frequencies. For example, when the rotation speed of the motor 7 is low, the control device 100 targets the machine 1f as the vibration suppression control of the vibration suppression control section 723 and the machine 2f as the load current control of the load current control section 732 . When the rotation speed of the motor 7 is high, the control device 100 targets the machine 1f as the vibration suppression control of the vibration suppression control unit 723, and targets
  • FIG. 10 is a block diagram showing a configuration example of the vibration suppression control section 723 included in the control device 100 of the power conversion device 200 according to Embodiment 2.
  • the vibration suppression control section 723 includes a calculation section 550, a cosine calculation section 551, a sine calculation section 552, multiplication sections 553 and 554, low-pass filters 555 and 556, subtraction sections 557 and 558, a frequency control section 559, 560 , multipliers 561 and 562 , and an adder 563 .
  • the calculation unit 550 integrates the estimated frequency value ⁇ est and divides it by the pole logarithm P m to calculate the mechanical angle phase ⁇ mn indicating the rotational position of the motor 7 .
  • a cosine calculator 551 calculates a cosine cos ⁇ mn based on the mechanical angle phase ⁇ mn .
  • a sine calculator 552 calculates a sine sin ⁇ mn based on the mechanical angle phase ⁇ mn .
  • the multiplier 553 multiplies the estimated frequency value ⁇ est by the cosine cos ⁇ mn to calculate the cosine component ⁇ est ⁇ cos ⁇ mn of the estimated frequency value ⁇ est .
  • the multiplier 554 multiplies the frequency estimation value ⁇ est by the sine sin ⁇ mn to calculate the sine component ⁇ est ⁇ sin ⁇ mn of the frequency estimation value ⁇ est .
  • the cosine component ⁇ est ⁇ cos ⁇ mn and the sine component ⁇ est ⁇ sin ⁇ mn calculated by the multipliers 553 and 554 include a pulsation component with a frequency of ⁇ mn and a pulsation component with a frequency higher than ⁇ mn . Contains harmonic components.
  • the low-pass filters 555 and 556 are first-order lag filters whose transfer function is represented by 1/(1+s ⁇ T f ). where s is the Laplacian operator. T f is a time constant and is determined to remove pulsation components with frequencies higher than the frequency ⁇ mn . Note that "removal" includes the case where part of the pulsation component is attenuated, that is, reduced.
  • the time constant Tf may be set by the operation control unit 102 based on the speed command, and the operation control unit 102 may notify the low-pass filters 555 and 556, or may be held by the low-pass filters 555 and 556. .
  • a first-order lag filter is an example, and a moving average filter or the like may be used, and the type of filter is not limited as long as the pulsation component on the high frequency side can be removed.
  • a low-pass filter 555 performs low-pass filtering on the cosine component ⁇ est ⁇ cos ⁇ mn to remove pulsation components with a frequency higher than the frequency ⁇ mn , and outputs a low frequency component ⁇ est_cos .
  • the low-frequency component ⁇ est_cos is a DC quantity representing a cosine component with a frequency ⁇ mn among the pulsating components of the frequency estimate ⁇ est .
  • a low-pass filter 556 performs low-pass filtering on the sine component ⁇ est ⁇ sin ⁇ mn to remove pulsation components with a frequency higher than the frequency ⁇ mn and outputs a low frequency component ⁇ est_sin .
  • the low-frequency component ⁇ est_sin is a DC quantity representing a sinusoidal component with a frequency ⁇ mn among the pulsating components of the frequency estimate ⁇ est .
  • the subtraction unit 557 calculates the difference between the low frequency component ⁇ est_cos output from the low-pass filter 555 and 0 ( ⁇ est_cos ⁇ 0).
  • the subtraction unit 558 calculates the difference ( ⁇ est_sin ⁇ 0) between the low frequency component ⁇ est_sin output from the low-pass filter 556 and 0.
  • a frequency control unit 559 performs a proportional integral operation on the difference ( ⁇ est_cos ⁇ 0) calculated by the subtraction unit 557 to obtain a cosine component i ⁇ AVS_cos of the current command value that brings the difference ( ⁇ est_cos ⁇ 0) close to zero. calculate. By generating the cosine component i ⁇ AVS_cos in this manner, the frequency control unit 559 performs control to match the low frequency component ⁇ est_cos to zero.
  • Frequency control unit 560 performs a proportional integral operation on the difference ( ⁇ est_sin ⁇ 0) calculated by subtraction unit 558 to generate a sine component i ⁇ AVS_sin of the current command value that brings the difference ( ⁇ est_sin ⁇ 0) close to zero. calculate.
  • the frequency control unit 560 generates the sine component i ⁇ AVS_sin in this manner, thereby performing control to match the low frequency component ⁇ est_sin to zero.
  • the multiplier 561 multiplies the cosine component i ⁇ AVS_cos output from the frequency control unit 559 by the cosine cos ⁇ mn to generate i ⁇ AVS_cos ⁇ cos ⁇ mn .
  • i[ delta]AVS_cos *cos[theta] mn is the AC component with frequency n*[omega ]est .
  • the multiplier 562 multiplies the sine component i ⁇ AVS_sin output from the frequency control unit 560 by the sine sin ⁇ mn to generate i ⁇ AVS_sin ⁇ sin ⁇ mn .
  • i ⁇ AVS_sin ⁇ sin ⁇ mn is the AC component with frequency n ⁇ est .
  • Addition unit 563 obtains the sum of i ⁇ AVS_cos ⁇ cos ⁇ mn output from multiplication unit 561 and i ⁇ AVS_sin ⁇ sin ⁇ mn output from multiplication unit 562 .
  • the vibration suppression control unit 723 outputs the value obtained by the addition unit 563 as the first compensation value i ⁇ AVS , which is the ⁇ -axis current command value for vibration suppression control. Note that if the first compensation value i ⁇ AVS obtained by the adder 563 is greater than the second current limit value i ⁇ limAVS for the vibration suppression control, the vibration suppression control unit 723 changes the first compensation value i ⁇ AVS to vibration.
  • the second current limit value i ⁇ limAVS for suppression control or less is output.
  • FIG. 11 is a first block diagram showing a configuration example of the load current control section 732 included in the control device 100 of the power conversion device 200 according to the second embodiment.
  • the load current controller 732 includes multipliers 581 and 582, low-pass filters 583 and 584, subtractors 585 and 586, integral controllers 587 and 588, multipliers 589 and 590, and an adder 591. .
  • the multiplier 581 multiplies the load current Idc by the cosine cos ⁇ x of the frequency component ⁇ x to be controlled.
  • the multiplier 582 multiplies the load current I dc by the sine sin ⁇ x of the frequency component ⁇ x to be controlled.
  • a low-pass filter 583 removes the AC component from the calculated value obtained by the multiplier 581 and extracts the DC component.
  • a low-pass filter 584 removes the AC component from the calculated value obtained by the multiplier 582 and extracts the DC component.
  • the subtraction unit 585 calculates the difference between the DC component and 0 so that the DC component obtained by the low-pass filter 583 becomes 0.
  • the subtraction unit 586 calculates the difference between the DC component obtained by the low-pass filter 584 and 0 so that the DC component becomes 0.
  • the integral control section 587 performs integral control on the difference obtained by the subtraction section 585 .
  • the integral control section 588 performs integral control on the difference obtained by the subtraction section 586 .
  • the multiplier 589 multiplies the value obtained by the integral control unit 587 by the cosine cos ⁇ x of the frequency component ⁇ x to restore the DC component to the AC component.
  • the multiplier 590 multiplies the value obtained by the integral control unit 588 by the sine sin ⁇ x of the frequency component ⁇ x to return the DC component to the AC component.
  • the adder 591 adds the values obtained by the multipliers 589 and 590 and outputs the result as the second compensation value i ⁇ lcc .
  • the load current control unit 732 sets the second compensation value i ⁇ lcc to the load. The output is made below the third current limit value i ⁇ limlcc for current control.
  • the load current control unit 732 can also perform load current control targeting a plurality of frequencies.
  • FIG. 12 is a second block diagram showing a configuration example of the load current control section 732 included in the control device 100 of the power conversion device 200 according to the second embodiment.
  • the load current control unit 732 includes multiplication units 581 and 582, low-pass filters 583 and 584, subtraction units 585 and 586, integration control units 587 and 588, and a multiplication unit 589 for each frequency targeted in load current control. , 590 and an addition unit 591 .
  • the operation of each configuration is as described above.
  • the load current control unit 732 includes addition units 592 that are one less than the number of frequencies targeted in the load current control.
  • the adder 592 adds the values obtained by the two adders 591 or the values obtained by the adders 591 and 592 .
  • the control device 100 controls the vibration suppression control of the vibration suppression control unit 723 and the load current control of the load current control unit 732.
  • the frequency of the controlled object is appropriately changed according to the rotational speed and the like.
  • the power conversion device 200 can efficiently suppress the generation of power source harmonics due to the unbalanced waveform of the power source current Iin .
  • Embodiment 3 In the power conversion device 200, the control device 100 sets the distribution ratio K margin of the ⁇ -axis current used in the vibration suppression control section 723 and the load current control section 732, and determines the priority of control. As described above, the control device 100 secures the ⁇ -axis current required for the constant current load control of the speed control unit 710, and then reduces the ⁇ -axis current for the control of the vibration suppression control unit 723 and the load current control unit 732. Pulsation is performed within the range of flowability. Since the ⁇ -axis current that can be used by the vibration suppression control section 723 and the load current control section 732 is thus limited, the control device 100 performs vibration suppression control and load current control according to the operating point of the motor 7 and the like. decide which to prioritize. Embodiment 3 describes a case where the distribution ratio K margin is set according to the rotation speed of the motor 7. FIG.
  • the distribution ratio determination unit 502 of the control device 100 selects and outputs the distribution ratio K margin according to the rotation speed of the motor 7 .
  • FIG. 13 is a block diagram showing a configuration example of distribution ratio determining section 502 included in control device 100 of power converter 200 according to the third embodiment. Distribution ratio determining section 502 includes setting section 601 .
  • FIG. 14 is a diagram showing an example of a relational expression representing the relationship between the rotation speed of the motor 7 and the distribution ratio K margin , which the setting unit 601 of the distribution ratio determination unit 502 according to the third embodiment has.
  • the setting unit 601 acquires the frequency command value ⁇ e * , regards the frequency command value ⁇ e * as the rotation speed of the motor 7, and sets the distribution ratio K according to the rotation speed of the motor 7 according to the relational expression shown in FIG. Select and output margin .
  • the compressor 8 vibrates remarkably due to speed fluctuations in a region where the rotation speed of the motor 7 is low, so it is necessary to give priority to vibration suppression control. Therefore, the setting unit 601 sets the value of the distribution ratio K margin to a large value in order to give priority to the vibration suppression control over the load current control in the region where the rotational speed of the motor 7 is low.
  • the setting unit 601 sets the value of the distribution ratio K margin to a small value in order to give priority to the load current control over the vibration suppression control in a region where the rotational speed of the motor 7 is high.
  • the setting unit 601 may determine which of the vibration suppression control and the load current control should be given priority by setting a threshold for the rotation speed, although not shown in FIG. 14 .
  • the distribution ratio determination section 502 determines the distribution ratio K margin according to the rotation speed of the motor 7 .
  • the distribution ratio determination unit 502 determines the distribution ratio K margin so that the vibration suppression control is prioritized over the load current control when the rotation speed of the motor 7 is equal to or lower than the specified rotation speed, which is the threshold value.
  • the distribution ratio K margin is determined so that the load current control is prioritized over the vibration suppression control when the rotational speed of the motor 7 is greater than a prescribed rotational speed which is a threshold value.
  • the setting unit 601 may set the value of the distribution ratio K margin according to the rotation speed of the motor 7 as indicated by the solid line in FIG.
  • the value of the distribution ratio K margin may be set as indicated by the dashed line.
  • the setting unit 601 uses the frequency command value ⁇ e * as the rotational speed of the motor 7 in the example of FIG. 13, this is an example and is not limited to this.
  • the setting unit 601 may use the estimated frequency value ⁇ est as the rotational speed of the motor 7 .
  • distribution ratio determining unit 502 of control device 100 uses ⁇ By setting the distribution ratio of the shaft current in advance, the load current control can be performed while giving priority to the vibration suppression control.
  • Embodiment 4 describes a case where the distribution ratio K margin is set according to the vibration level of the compressor 8.
  • distribution ratio determination unit 502 of control device 100 selects and outputs distribution ratio K margin according to the vibration level of compressor 8 .
  • FIG. 15 is a block diagram showing a configuration example of the distribution ratio determining section 502 included in the control device 100 of the power conversion device 200 according to the fourth embodiment.
  • Distribution ratio determining section 502 includes setting section 602 .
  • FIG. 16 is a diagram showing an example of a relational expression representing the relationship between the vibration level of the compressor 8 and the distribution ratio K margin , which the setting unit 602 of the distribution ratio determination unit 502 according to the fourth embodiment has.
  • the setting unit 602 acquires the estimated frequency value ⁇ est , estimates the vibration level of the compressor 8 from the pulsation of the rotation speed of the motor 7 indicated by the estimated frequency value ⁇ est , and calculates the vibration level of the compressor 8 according to the relational expression shown in FIG. 8, the distribution ratio K margin corresponding to the vibration level is selected and output.
  • the setting unit 602 sets the value of the distribution ratio K margin so that the suppression of generation of power supply harmonics is given priority in a region where the vibration level of the compressor 8 is equal to or lower than the threshold, that is, the load current control is given priority over the vibration suppression control. .
  • the setting unit 602 increases the value of the distribution ratio K margin according to an increase in the vibration level of the compressor 8, thereby increasing the ⁇ -axis current distributed to the vibration suppression control, thereby reducing noise due to vibration and breakage of the compressor 8. prevent.
  • the setting unit 602 sets the value of the distribution ratio K margin so that vibration suppression is prioritized in a region where the vibration level of the compressor 8 exceeds a threshold value, that is, vibration suppression control is prioritized over load current control.
  • the distribution ratio determination unit 502 determines the distribution ratio K margin according to the vibration level of the compressor 8 driven by the motor 7 .
  • the distribution ratio determining unit 502 determines the distribution ratio K margin so that the vibration suppression control is given priority over the load current control when the vibration of the compressor 8 exceeds a specified vibration level, and the compression
  • the distribution ratio K margin is determined so that load current control is prioritized over vibration suppression control.
  • FIG. 17 is a diagram showing a configuration example of the compressor 8 connected to the power converter 200 according to the fourth embodiment.
  • the compressor 8 has a refrigerant suction portion 81 and a refrigerant discharge portion 82, and a vibration detection portion 83 is installed.
  • the vibration detector 83 is, for example, an acceleration sensor.
  • Vibration detection unit 83 detects the vibration level of compressor 8 and outputs information on the vibration level of compressor 8 to distribution ratio determination unit 502 .
  • the distribution ratio determination unit 502 acquires information on the vibration level of the compressor 8 from the vibration detection unit 83 .
  • the setting unit 602 of the distribution ratio determining unit 502 may estimate the vibration level of the compressor 8 from the pulsation of the rotational speed of the motor 7 indicated by the estimated frequency value ⁇ est .
  • Information on the vibration level of the compressor 8 may be acquired from the vibration detection unit 83 that detects the vibration level.
  • distribution ratio determining unit 502 of control device 100 is used in advance for vibration suppression control and load current control according to the vibration level of compressor 8. By determining the distribution ratio of the ⁇ -axis current, load current control can be performed while giving priority to vibration suppression control.
  • Embodiment 5 describes a case where the distribution ratio K margin is set according to the power supply harmonic standard value tolerance in the power conversion device 200 .
  • the configuration of power converter 200 is the same as the configuration of power converter 200 in Embodiment 1 shown in FIG.
  • FIG. 18 is a block diagram showing a configuration example of the distribution ratio determining section 502 included in the control device 100 of the power conversion device 200 according to Embodiment 5.
  • Distribution ratio determination section 502 includes power harmonic standard value calculator 603 , order component calculator 604 , power harmonic standard value margin calculator 605 , and setting section 606 .
  • the power harmonic standard value calculation unit 603 calculates the power harmonic standard value for each order of the power harmonic.
  • FIG. 19 is a block diagram showing a configuration example of the power supply harmonic standard value calculation unit 603 included in the control device 100 of the power conversion device 200 according to Embodiment 5.
  • the power harmonic standard value calculator 603 includes a power calculator 611 , a power multiplier 612 , a limit value converter 613 , and a coefficient multiplier 614 .
  • Power calculation unit 611 uses ⁇ -axis voltage command value V ⁇ * , ⁇ -axis voltage command value V ⁇ * , excitation current i ⁇ , and torque current i ⁇ to calculate ⁇ -axis voltage command value V ⁇ * ⁇ excitation current i
  • the electric power W is calculated by the formula of ⁇ + ⁇ -axis voltage command value V ⁇ * ⁇ torque current i ⁇ .
  • the power multiplier 612 calculates the power exceeding the specified 600 watts from the power W as (W-600), and multiplies the calculated value by the second term of the maximum allowable harmonic current specified for each order. . 600 watts is a value specified in JIS (Japanese Industrial Standards) C 61000-3-2. In the example of FIG. 19, "1.08+0.00033" is the maximum allowable harmonic current when the harmonic order of the power supply is 2, so the power multiplier 612 calculates "1.08+0.00033 (W-600)". Calculate as The power multiplier 612 performs similar calculations for other orders of power supply harmonics.
  • the limit value conversion unit 613 multiplies the value of each order obtained by the power multiplication unit 612 by (230/power supply voltage) to calculate the limit value for each order.
  • 230 is the value when the power supply is single-phase, as specified in the aforementioned JIS C 61000-3-2.
  • the power supply voltage is 100V or 200V in a general usage environment.
  • a coefficient multiplier 614 multiplies a coefficient K of 0 ⁇ K ⁇ 1 to set a margin for the limit value for each order obtained by the limit value conversion unit 613, and obtains a power supply harmonic for each order in power supply harmonics.
  • FIG. 20 is a block diagram showing a configuration example of the order component calculation section 604 included in the control device 100 of the power conversion device 200 according to Embodiment 5. As shown in FIG.
  • the order component calculation unit 604 includes multiplication units 621 and 622, low-pass filters 623 and 624, a peak value calculation unit 625, an effective value calculation unit 626, a squaring unit 627, division units 628 and 629, and an addition unit. 630 and a 1/2 power part 631 .
  • the order component calculation unit 604 does not target only the integer values, but targets the entire range by cooperating with the orders before and after.
  • the order component calculation unit 604 for example, targets the 1.5th to 2.5th orders when targeting the second order, and targets the 2.5th to 3.5th orders when targeting the third order.
  • the order component calculation unit 604 performs calculation in units of 5 Hz in the range from 75 Hz to 125 Hz when the order is second order.
  • the order component calculation unit 604 performs multiplication units 621 and 622, low-pass filters 623 and 624, peak value calculation unit 625, and effective value calculation unit 626 for the target order times the calculation target frequency component at each order. Be prepared for a few minutes.
  • the multiplier 621 multiplies the power supply current I in by the cosine cos ⁇ x of the frequency component ⁇ x to be calculated.
  • the multiplier 622 multiplies the power supply current I in by the sine sin ⁇ x of the frequency component ⁇ x to be calculated.
  • a low-pass filter 623 removes the AC component from the calculated value obtained by the multiplier 621 and extracts the DC component.
  • a low-pass filter 624 removes the AC component from the calculated value obtained by the multiplier 622 and extracts the DC component.
  • the peak value calculator 625 uses I in_cosx obtained from the low-pass filter 623 and I in_sinx obtained from the low-pass filter 624 to calculate the peak value of the frequency component ⁇ x to be calculated.
  • the effective value calculator 626 divides the peak value of the frequency component ⁇ x to be calculated obtained by the peak value calculator 625 by ⁇ (2) to obtain the effective value of the frequency component ⁇ x to be calculated. Calculate. ⁇ (2) represents the square
  • the squaring unit 627 squares the effective value calculated at each frequency of the order to be calculated.
  • the minimum frequency among the frequency components is (n-1).
  • the maximum frequency is n. It is described as fifth order. For example, when the order is 2, the minimum frequency is 1.5 and the maximum frequency is 2.5.
  • the minimum frequency is the same as the maximum frequency of the next lower order, and the maximum frequency is the same as the minimum frequency of the one higher order.
  • a division unit 628 halves the square value of the effective value of the minimum frequency obtained by the squaring unit 627 in order to eliminate the influence of overlapping portions.
  • a division unit 629 halves the square value of the effective value of the maximum frequency obtained by the squaring unit 627 in order to eliminate the influence of overlapping portions.
  • Adder 630 obtains a total value by adding the values obtained by squaring the effective values calculated at each frequency of the order to be calculated, or the values obtained by halving the squared values.
  • a 1/2 power unit 631 takes the square root of the total value obtained by the addition unit 630 to obtain the magnitude of the order component to be calculated.
  • the order component calculation unit 604 performs similar calculations for each order.
  • a power harmonic standard value tolerance calculator 605 calculates a power harmonic standard value tolerance. Specifically, the power harmonic standard value tolerance calculation unit 605 calculates the power harmonic standard value calculated by the power harmonic standard value calculation unit 603 and the power harmonic standard value calculated by the order component calculation unit 604 for each order. Calculate the difference with the harmonic order component. The power harmonic standard value tolerance calculation unit 605 outputs the calculated difference to the setting unit 606 as the power harmonic standard value tolerance.
  • the setting unit 606 selects and outputs the distribution ratio K margin according to the power harmonic standard value tolerance acquired from the power harmonic standard value tolerance calculation unit 605 according to the relational expression shown in FIG.
  • FIG. 21 is a diagram showing an example of a relational expression representing the relationship between the power supply harmonic standard value tolerance and the distribution ratio K margin , which setting section 606 of distribution ratio determination section 502 according to the fifth embodiment has.
  • the setting unit 606 sets the value of the distribution ratio K margin so that the suppression of the generation of power harmonics is prioritized in a region where the power harmonics standard value tolerance is equal to or less than the threshold, that is, the load current control is prioritized over the vibration suppression control. do.
  • the setting unit 606 increases the ⁇ -axis current distributed to the vibration suppression control by increasing the value of the distribution ratio K margin according to the increase in the power supply harmonic standard value margin.
  • the setting unit 606 sets the value of the distribution ratio K margin so that vibration suppression is prioritized in a region where the power supply harmonic standard value margin exceeds the threshold, that is, vibration suppression control is prioritized over load current control.
  • the setting unit 606 acquires the power harmonic standard value tolerance for each order from the power harmonic standard value tolerance calculating unit 605, the acquired power harmonic standard value tolerance is An average value of a plurality of power supply harmonic standard value tolerances may be calculated and used, the maximum value may be used, or the minimum value may be used.
  • the power harmonic standard value tolerance calculation unit 605 calculates the average value of a plurality of power harmonic standard value tolerances, selects the maximum value, or selects the minimum value, and sends to the setting unit 606 It is also possible to output one power supply harmonic standard value tolerance that is actually used.
  • the distribution ratio determination unit 502 determines the distribution ratio K margin according to the power supply harmonic standard value tolerance. In the control device 100, the distribution ratio determination unit 502 determines the distribution ratio K margin so that the vibration suppression control is prioritized over the load current control when the power supply harmonic standard value tolerance exceeds the threshold value. If the standard value margin is below the threshold, the distribution ratio K margin is determined so that load current control is prioritized over vibration suppression control.
  • the distribution ratio determination unit 502 can calculate the power harmonic standard value tolerance using the current value of the power source current Iin from the commercial power source 1 as described above. Not limited.
  • the distribution ratio determining unit 502 may acquire information on the power harmonic standard value tolerance from the measuring device. .
  • distribution ratio determining section 502 only needs to have information of the relational expression indicating the relationship between power supply harmonic standard value margin and distribution ratio K margin shown in FIG. The configuration may be the same as in the case of .
  • distribution ratio determining unit 502 of control device 100 performs vibration suppression control and load current control in advance according to power supply harmonic standard value tolerance. By determining the distribution ratio of the ⁇ -axis current to be used, load current control can be performed while giving priority to vibration suppression control.
  • Embodiment 6 describes a case where the distribution ratio K margin is set according to the efficiency of the power converter 200.
  • the configuration of power converter 200 is the same as the configuration of power converter 200 in Embodiment 1 shown in FIG.
  • load current control is superior to vibration suppression control in terms of all losses generated in devices such as the inverter 30, the motor 7, and a converter (not shown). Therefore, in control device 100, distribution ratio determination unit 502 determines distribution ratio K margin so that load current control is prioritized under operating conditions where efficiency is required. Also in this case, the power conversion device 200 can obtain the same effects as in the cases of the third to fifth embodiments.
  • Control device 100 may determine distribution ratio K margin by combining each method described in Embodiment 3 to Embodiment 6, which is the present embodiment.
  • the control device 100 may take the average value of the distribution ratio K margin obtained by each method using the rotation speed of the motor 7, the vibration level of the compressor 8, the power harmonic standard value tolerance, and the efficiency.
  • the method may be weighted to determine the distribution ratio K margin .
  • Embodiment 7 In Embodiments 1 to 6, one of the vibration suppression control and the load current control is set as the first control, and the other is set as the second control. However, in an operating state in which the motor 7 rotates at a high speed and vibration suppression control is unnecessary, the power converter 200 can perform only load current control without any problem. In such a case, the power conversion device 200 may simultaneously perform two or more load current controls targeting different frequencies as the load current control. Embodiment 7 describes a case where load current control is performed as the first control and the second control.
  • the configuration of power converter 200 is the same as the configuration of power converter 200 in Embodiment 1 shown in FIG.
  • FIG. 22 is a block diagram showing a configuration example of the ⁇ -axis current command value generation section 503 included in the voltage command value calculation section 115 according to the seventh embodiment.
  • the ⁇ -axis current command value generation unit 503 according to the seventh embodiment shown in FIG. 22 controls the vibration suppression control unit 723 as load current control in contrast to the ⁇ -axis current command value generation unit 503 according to the first embodiment shown in FIG. 733 is replaced.
  • the load current control unit 733 targets the machine 1f and performs load current control so as to suppress generation of power source harmonics.
  • the load current control unit 732 targets the machine 2f or
  • the distribution ratio determination unit 502 determines the distribution ratio K margin according to the frequency targeted in load current control.
  • the control device 100 performs the first control and the second control so as to suppress the generation of power source harmonics while giving priority to the constant current load control for controlling the rotation speed of the motor 7 .
  • the first control and the second control are load current controls for controlling load current Idc , which is the output current of smoothing capacitor 5, to approach a desired value.
  • the power conversion device 200 does not perform vibration suppression control in an operating state in which the rotation speed of the motor 7 is in a high-speed rotation state and vibration suppression control is unnecessary. Two or more load current controls are performed simultaneously targeting different frequencies. As a result, the power conversion device 200 can further suppress the generation of power supply harmonics compared to the first to sixth embodiments.
  • FIG. 23 is a diagram showing a configuration example of a refrigeration cycle equipment 900 according to Embodiment 8.
  • a refrigerating cycle applied equipment 900 according to the eighth embodiment includes the power converter 200 described in the first to seventh embodiments.
  • the refrigerating cycle applied equipment 900 according to Embodiment 8 can be applied to products equipped with a refrigerating cycle, such as air conditioners, refrigerators, freezers, and heat pump water heaters.
  • constituent elements having functions similar to those of the first embodiment are denoted by the same reference numerals as those of the first embodiment.
  • Refrigerating cycle applied equipment 900 includes compressor 8 incorporating motor 7 in Embodiment 1, four-way valve 902, indoor heat exchanger 906, expansion valve 908, and outdoor heat exchanger 910 with refrigerant pipe 912. attached through
  • a compression mechanism 904 for compressing refrigerant and a motor 7 for operating the compression mechanism 904 are provided inside the compressor 8 .
  • the refrigeration cycle applied equipment 900 can perform heating operation or cooling operation by switching operation of the four-way valve 902 .
  • Compression mechanism 904 is driven by motor 7 whose speed is controlled.
  • the refrigerant is pressurized by the compression mechanism 904 and sent out 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 compression mechanism 904 .
  • the refrigerant is pressurized by the compression mechanism 904 and sent 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 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.

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PCT/JP2021/038972 2021-10-21 2021-10-21 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 WO2023067774A1 (ja)

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PCT/JP2021/038972 WO2023067774A1 (ja) 2021-10-21 2021-10-21 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
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WO2025203346A1 (ja) * 2024-03-27 2025-10-02 三菱電機株式会社 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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009232591A (ja) * 2008-03-24 2009-10-08 Mitsubishi Electric Corp 電動機駆動装置および空気調和機
WO2020184285A1 (ja) * 2019-03-14 2020-09-17 ダイキン工業株式会社 直接形の電力変換装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009232591A (ja) * 2008-03-24 2009-10-08 Mitsubishi Electric Corp 電動機駆動装置および空気調和機
WO2020184285A1 (ja) * 2019-03-14 2020-09-17 ダイキン工業株式会社 直接形の電力変換装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025203346A1 (ja) * 2024-03-27 2025-10-02 三菱電機株式会社 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

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