WO2022149207A1 - 電力変換装置、モータ駆動装置及び冷凍サイクル適用機器 - Google Patents
電力変換装置、モータ駆動装置及び冷凍サイクル適用機器 Download PDFInfo
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- WO2022149207A1 WO2022149207A1 PCT/JP2021/000193 JP2021000193W WO2022149207A1 WO 2022149207 A1 WO2022149207 A1 WO 2022149207A1 JP 2021000193 W JP2021000193 W JP 2021000193W WO 2022149207 A1 WO2022149207 A1 WO 2022149207A1
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 46
- 238000005057 refrigeration Methods 0.000 title claims description 11
- 239000003990 capacitor Substances 0.000 claims abstract description 33
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- 238000001514 detection method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 10
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- 230000006870 function Effects 0.000 description 9
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 230000007246 mechanism Effects 0.000 description 7
- 239000003507 refrigerant Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
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- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- the present disclosure relates to a power conversion device, a motor drive device, and a refrigeration cycle applicable device for converting AC power into desired power.
- a power conversion device that converts a power supply voltage, which is a voltage applied from an AC power supply, into a desired AC voltage and applies it to a load such as an air conditioner.
- a power conversion device which is a control device for an air conditioner, rectifies a power supply voltage applied from an AC power supply by a diode stack, which is a converter, and further smoothes a plurality of voltages by a smoothing portion.
- the power supply current flows only in a part of the half-cycle period of the AC power supply. Therefore, there is a problem that the flow rate of the power supply current is low and the harmonic components included in the power supply current increase.
- a method of adding a power factor improving circuit equipped with a switching element to increase the flow rate of the power supply current and suppressing harmonic components contained in the power supply current.
- this method it is necessary to add a power factor improving circuit provided with a switching element, which increases the cost of the device and raises another problem that the device becomes large.
- the present disclosure has been made in view of the above, and an object thereof is to obtain a power conversion device capable of suppressing an increase in cost and an increase in size of the device while suppressing a harmonic component contained in a power supply current.
- the power conversion device includes a converter circuit, a capacitor, and an inverter circuit.
- the converter circuit has first and second diodes that are half-bridged connected. Further, the converter circuit has a first AC input end and first and second DC output ends, and the first AC input end is connected to one side of the AC power supply. One end of the capacitor is connected to the first DC output end and the other end is connected to the second DC output end.
- the inverter circuit has a plurality of semiconductor switching elements connected by a three-phase bridge. Further, the inverter circuit has first and second DC input ends, and first to third AC output ends.
- the first DC input end is connected to one end of the capacitor and the second DC input end is connected to the other end of the capacitor.
- the first to third AC output ends are connected to the motor which is the load, and the first AC output end is connected to the other side of the AC power supply.
- the power conversion device According to the power conversion device according to the present disclosure, it is possible to suppress the increase in cost and size of the device while suppressing the harmonic component contained in the power supply current.
- the figure which shows the structural example of the power conversion apparatus which concerns on Embodiment 1. A block diagram showing a configuration example of the control unit according to the first embodiment. A flowchart used to explain the operation of the voltage command value correction unit shown in FIG. The figure which shows the analysis result when it controlled by applying the control part of FIG. 2 to the circuit structure of FIG. A block diagram showing an example of a hardware configuration that realizes the function of the control unit in the first embodiment. A block diagram showing another example of a hardware configuration that realizes the function of the control unit in the first embodiment.
- connection includes both the case where the components are directly connected to each other and the case where the components are electrically connected to each other via other components.
- FIG. 1 is a diagram showing a configuration example of the power conversion device 1 according to the first embodiment.
- the power conversion device 1 is connected to the AC power supply 100 and the device 120.
- One example of the device 120 is a compressor, and another example of the device 120 is a fan.
- the device 120 has a motor 110.
- the power conversion device 1 converts the power supply voltage applied from the AC power supply 100 into an AC voltage having a desired amplitude and phase and applies it to the motor 110.
- the power conversion device 1 includes a control unit 2, a converter circuit 3, an inverter circuit 4, a reactor 5, a capacitor 6, current detection units 7 and 8, voltage detection units 9 and 11, and a zero cross detection unit 10. To prepare for.
- the motor drive device 50 is configured by the power conversion device 1 and the motor 110 included in the device 120.
- the voltage detection unit 9 detects the power supply voltage Vs applied to the converter circuit 3 from the AC power supply 100.
- the zero-cross detection unit 10 generates a zero-cross signal Zc corresponding to the power supply voltage Vs of the AC power supply 100.
- the zero cross signal Zc is, for example, a signal that outputs a “High” level when the power supply voltage Vs is positive, and is a signal that outputs a “Low” level when the power supply voltage Vs is negative. Note that these levels may be reversed.
- the detected value of the power supply voltage Vs and the zero cross signal Zc are input to the control unit 2.
- the converter circuit 3 has diodes D1 and D2 connected by half bridge. Specifically, the anode of the diode D1 is connected to the cathode of the diode D2.
- the diode D1 may be referred to as a "first diode” and the diode D2 may be referred to as a "second diode”.
- a reactor 5 and a current detection unit 7 are arranged between the converter circuit 3 and the AC power supply 100.
- the converter circuit 3 rectifies the power supply voltage Vs applied from the AC power supply 100.
- the converter circuit 3 has DC output ends 3a and 3b and AC input ends 3c.
- the connection points of the diodes D1 and D2 connected in series are the AC input ends 3c.
- the cathode of the diode D1 is connected to the DC output end 3a, and the anode of the diode D2 is connected to the DC output end 3b.
- the AC input terminal 3c is connected to one side of the AC power supply 100 via the reactor 5.
- the DC output end 3a is referred to as a "first DC output end”
- the DC output end 3b is referred to as a "second DC output end”
- the AC input end 3c is referred to as a "first AC input end”. May be called.
- the capacitor 6 is connected to the output end of the converter circuit 3. Specifically, one end of the capacitor 6 is connected to the DC output end 3a of the converter circuit 3, and the other end of the capacitor 6 is connected to the DC output end 3b of the converter circuit 3.
- the capacitor 6 smoothes the rectified voltage output by the converter circuit 3. Examples of the capacitor 6 include an electric field capacitor and a film capacitor.
- the voltage detection unit 11 is connected to both ends of the capacitor 6.
- the voltage detection unit 11 detects the capacitor voltage V dc , which is the voltage of the capacitor 6.
- the detected value of the capacitor voltage V dc is input to the control unit 2.
- the capacitor voltage V dc is also the voltage of the DC bus to which the capacitor 6 is connected. Therefore, the capacitor voltage may be referred to as "bus voltage”.
- the inverter circuit 4 is connected to both ends of the capacitor 6.
- the inverter circuit 4 has a plurality of switching elements connected by a three-phase bridge.
- the plurality of switching elements include upper arm semiconductor switching elements Up, Vp, Wp and lower arm semiconductor switching elements Un, Vn, Wn. Freewheeling diodes connected in antiparallel are provided at both ends of each semiconductor switching element.
- the semiconductor switching element Up and the semiconductor switching element Un are connected in series to form a U-phase leg.
- the semiconductor switching element Vp and the semiconductor switching element Vn are connected in series to form a V-phase leg.
- the semiconductor switching element Wp and the semiconductor switching element Wn are connected in series to form a W-phase leg.
- the inverter circuit 4 has DC input ends 4a and 4b and AC output ends 4c, 4d and 4e.
- the DC input end 4a is connected to one end of the capacitor 6, and the DC input end 4b is connected to the other end of the capacitor 6.
- the DC input end 4a may be referred to as a "first DC input end”
- the DC input end 4b may be referred to as a "second DC input end”.
- the AC output ends 4c, 4d, 4e are connected to the motor 110, which is a load. Further, the AC output terminal 4c is connected to the other side of the AC power supply 100.
- the U-phase leg having the AC output end 4c constitutes a full-wave rectifier circuit together with the converter circuit 3. In the U-phase leg, the full-wave rectification operation is performed by a freewheeling diode connected in antiparallel to each of the semiconductor switching elements Up and Un.
- FIG. 1 illustrates a configuration in which the AC output terminal 4c is connected to the other side of the AC power supply 100, but the present invention is not limited to this. Any one of the AC output ends 4d and 4e may be connected to the other side of the AC power supply 100.
- the AC output end connected to the other side of the AC power supply 100 is referred to as the "first AC output end”
- the two AC output ends not connected to the other side of the AC power supply 100 are referred to as "first AC output ends”, respectively. It may be referred to as a "second AC output end” and a "third AC output end”.
- the semiconductor switching elements Up to Wn are controlled to be turned on or off by the drive signals Gup to Gwn output from the control unit 2.
- the inverter circuit 4 turns on and off the semiconductor switching elements Up to Wn, and converts the voltage output from the converter circuit and the capacitor 6 into an AC voltage to the motor 110.
- the current detection unit 7 detects the power supply current I in , which is the current flowing between the AC power supply 100 and the converter circuit 3.
- the current detection unit 8 detects the inverter current I inv , which is the current flowing through the inverter circuit 4.
- the inverter current I inv is also a current flowing between the inverter circuit 4 and the capacitor 6.
- the power supply current I in and the inverter current I inv are input to the control unit 2.
- An example of the device 120 is an air conditioner.
- the motor 110 is a motor for driving a compressor
- the motor 110 rotates according to the amplitude and phase of the AC voltage applied from the inverter circuit 4, and performs a compression operation.
- the motor 110 is a motor for driving a fan
- the motor 110 rotates according to the amplitude and phase of the AC voltage applied from the inverter circuit 4, and performs a blowing operation.
- the AC output terminal 4c in the inverter circuit 4 is connected to the other side of the AC power supply 100.
- the power supply voltage Vs is short-circuited via the reactor 5 and the diode D1.
- the power supply voltage V s is short-circuited via the reactor 5 and the diode D2.
- the current path by this operation is the same as the current path by the power supply short-circuit operation when the conventional power factor improving circuit is provided.
- FIG. 2 is a block diagram showing a configuration example of the control unit 2 according to the first embodiment.
- the control unit 2 includes a motor control unit 22, a converter output control unit 23, a voltage command value correction unit 24, and a PWM (Pulse Width Modulation) control unit 25.
- the motor control unit 22 includes a position sensorless control unit 221, an integrator 222, a coordinate conversion unit 223, and subtractors 224 and 225.
- the converter output control unit 23 includes a PAM (Pulse Amplitude Modulation) control unit 231.
- V ⁇ * , V ⁇ * are the ⁇ -axis voltage command value and the ⁇ -axis voltage command value in the ⁇ rotating coordinate system, respectively.
- ⁇ 1 , ⁇ m are the estimated value of the rotation speed and the estimated position of the rotor of the motor 110, respectively.
- D u (Y) * , D v (Y) * , D w (Y) * are the U-phase voltage command value, V-phase voltage command value, and W-phase voltage command value in the stationary three-phase coordinate system, respectively. be.
- (Y)” means a star connection.
- the U-phase voltage command value, the V-phase voltage command value, and the W-phase voltage command value are collectively referred to as a three-phase voltage command value.
- D u (V) * , D v (V) * , D w (V) * is a three-phase voltage command value equivalent to V connection.
- the V connection equivalent means that the potential of the AC output terminal 4c is always fixed to the potential of the other side of the AC power supply 100.
- Dac * is the power supply short circuit duty.
- the power supply short circuit duty D ac * is the time ratio of the power supply short circuit operation time to the half cycle of the power supply voltage.
- Du *, Dv *, Dw * is the corrected three-phase voltage command value.
- Gup to Gwn is a drive signal for the semiconductor switching elements Up to Wn.
- the ⁇ -axis current of the rotating coordinate system is calculated inside the position sensorless control unit 221.
- a current controller (not shown) generates a ⁇ -axis voltage command value V ⁇ * and a ⁇ -axis voltage command value V ⁇ * that match the ⁇ -axis current with the command value of the ⁇ -axis current.
- an estimated rotation speed ⁇ 1 is generated and input to the integrator 222.
- the integrator 222 integrates the estimated rotation speed ⁇ 1 to generate the estimated position ⁇ m of the rotor.
- the coordinate conversion unit 223 issues a ⁇ -axis voltage command value V ⁇ * and a ⁇ -axis voltage command value V ⁇ * to a three-phase voltage command in a stationary three-phase coordinate system based on the estimated position ⁇ m of the rotor and the capacitor voltage V dc . Convert to values D u (Y) * , D v (Y) * , D w (Y) * .
- the U-phase voltage command value Du (Y) * is subtracted from the V-phase voltage command value D v (Y) * , and the difference value is the V-phase voltage command value D v (V) equivalent to the V connection. * Is input to the voltage command value correction unit 24.
- the U-phase voltage command value Du (Y) * is subtracted from the W-phase voltage command value D w (Y) * , and the difference value is the W-phase voltage command value D w ( equivalent to V connection).
- V) * is input to the voltage command value correction unit 24.
- the U-phase voltage command value Du (V) * corresponding to the V connection is fixed to 0 and input to the voltage command value correction unit 24 as shown in FIG.
- the motor control unit 22 generates the three-phase voltage command values Du (Y) * , D v (Y) * , and D w (Y) * for controlling the inverter circuit 4. Further, the motor control unit 22 uses the three-phase voltage command values D u (Y) * , D v (Y) * , and D w (Y) * to obtain voltage command values D v (V) * equivalent to V connection. D w (V) * is generated and output to the voltage command value correction unit 24.
- the PAM control unit 231 In the converter output control unit 23, the PAM control unit 231 generates a power supply short circuit duty D ac * based on the power supply voltage V s , the capacitor voltage V dc , the power supply current I in , and the zero cross signal Z c , and corrects the voltage command value. Output to unit 24.
- the capacitor voltage V dc is referred to for controlling the bus voltage. That is, the power supply short-circuit duty D ac * is a command value for performing converter output control including power factor improvement control and bus voltage control.
- the converter output control unit 23 generates a power supply short-circuit duty D ac *, which is a control signal for controlling the output of the converter circuit 3, and outputs the power supply short-circuit duty D ac * to the voltage command value correction unit 24.
- FIG. 3 is a flowchart used to explain the operation of the voltage command value correction unit 24 shown in FIG.
- the voltage command value correction unit 24 determines the polarity of the power supply voltage Vs (step S11). When the polarity of the power supply voltage V s is positive (step S11, Yes), the corrected U -phase voltage command value Du * is calculated based on the following equation (1) (step S12).
- step S13 when the polarity of the power supply voltage V s is negative (steps S11 and No), the corrected U -phase voltage command value Du * is calculated based on the following equation (2) (step S13).
- V s When the value of the power supply voltage V s is 0, it may be determined by either positive or negative polarity.
- the corrected V-phase voltage command value D v * and the corrected W-phase voltage command value D w * are calculated based on the following equations (3) and (4) (step S14).
- the U -phase voltage command value Du * includes a power supply short-circuit duty D ac * . Therefore, in the inverter circuit 4, the motor control operation and the converter output control operation are performed at the same time.
- the "motor control operation” referred to here is an operation in which the inverter circuit 4 applies a voltage for controlling the rotation speed or rotation torque of the motor 110 to the motor 110.
- the motor control operation is carried out by the switching operation of the six semiconductor switching elements Up to Wn.
- the "converter output control operation” includes the power factor improvement control operation and the bus voltage control operation as described above.
- the converter output control operation is performed by two semiconductor switching elements Up and Un.
- the output voltage of the inverter circuit 4 causes a three-phase imbalance. Therefore, as shown in the above equations (3) and (4), the U -phase voltage command value Du * is added to each of the V-phase voltage command value D v * and the W-phase voltage command value D w * . To. By doing so, the three-phase imbalance can be eliminated.
- step S14 When the process of step S14 is completed, the process returns to step S11. After that, the processes of steps S11 to S14 are repeated.
- the voltage command value correction unit 24 corrects the voltage command values D v (V) * and D w (V) * equivalent to the V connection based on the power supply short circuit duty D ac * which is a control signal. Perform processing.
- the corrected three-phase voltage command values Du * , D v * , and D w * corrected by the voltage command value correction unit 24 are input to the PWM control unit 25.
- the PWM control unit 25 generates drive signals Gup to Gwn for driving the semiconductor switching elements Up to Wn based on the three-phase voltage command values D u * , D v * , and D w * .
- FIG. 4 is a diagram showing an analysis result when the control unit 2 of FIG. 2 is applied to the circuit configuration of FIG. 1 for control.
- the horizontal axes in FIG. 4 all represent time.
- the rotation speed when the command value of the rotation speed is 50 [Hz] is shown by a solid line.
- the U-phase current is shown by a solid line
- the V-phase current is shown by a two-dot chain line
- the W-phase current is shown by a broken line.
- the U-phase voltage command is shown by a chain double-dashed line
- the V-phase voltage command is shown by a broken line
- the W-phase voltage command is shown by a solid line.
- the bus voltage when the command value of the bus voltage is 380 [V] is shown by a solid line.
- the fluctuating power supply current is shown by a solid line.
- the power supply current can be controlled in a sine and cosine shape while the motor current is maintained in a sine and cosine shape. This has been demonstrated to enable motor control and converter output control with a smaller number of semiconductor switching elements than before.
- FIG. 5 is a block diagram showing an example of a hardware configuration that realizes the function of the control unit 2 in the first embodiment.
- FIG. 6 is a block diagram showing another example of the hardware configuration that realizes the function of the control unit 2 in the first embodiment.
- the processor 300 that performs the calculation
- the memory 302 that stores the program read by the processor 300
- the interface 304 for inputting / outputting signals can be included.
- the processor 300 may be an arithmetic unit, a microprocessor, a microcomputer, a CPU (Central Processing Unit), or a DSP (Digital Signal Processor).
- the memory 302 includes a non-volatile or volatile semiconductor memory such as a RAM (Radom Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Project ROM), and an EEPROM (registered trademark) (Electrically EPROM). Examples thereof include magnetic discs, flexible discs, optical discs, compact discs, mini discs, and DVDs (Digital entirely Disc).
- the memory 302 stores a program that executes the function of the control unit 2 in the first embodiment.
- the processor 300 sends and receives necessary information via the interface 304, the processor 300 executes a program stored in the memory 302, and the processor 300 refers to a table stored in the memory 302 to perform the above-mentioned processing. It can be carried out.
- the calculation result by the processor 300 can be stored in the memory 302.
- the processing circuit 303 shown in FIG. 6 can also be used.
- the processing circuit 303 corresponds to a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof.
- the information input to the processing circuit 303 and the information output from the processing circuit 303 can be obtained via the interface 304.
- control unit 2 may be performed by the processing circuit 303, and processing not performed by the processing circuit 303 may be performed by the processor 300 and the memory 302.
- the power conversion device includes a converter circuit, a capacitor, and an inverter circuit.
- the converter circuit has first and second diodes that are half-bridged connected. Further, the converter circuit has a first AC input end and first and second DC output ends, and the first AC input end is connected to one side of the AC power supply, and the first AC input end, and It has first and second DC output ends. One end of the capacitor is connected to the first DC output end of the converter circuit and the other end is connected to the second DC output end of the converter circuit.
- the inverter circuit has a plurality of semiconductor switching elements connected by a three-phase bridge. Further, the inverter circuit has first and second DC input ends, and first to third AC output ends.
- the first DC input end is connected to one end of the capacitor and the second DC input end is connected to the other end of the capacitor. Further, the first to third AC output ends are connected to a motor which is a load, and the first AC output end is connected to the other side of the AC power supply.
- the flow rate of the power supply current can be increased by appropriately controlling the inverter circuit. As a result, it is possible to suppress an increase in cost and an increase in size of the device while suppressing harmonic components included in the power supply current.
- FIG. 7 is a diagram showing a configuration example of the power conversion device 1A according to the second embodiment.
- the converter circuit 3 shown in FIG. 1 is replaced with the converter circuit 3A.
- the motor drive device 50A is composed of the power conversion device 1A and the motor 110 included in the device 120.
- diodes D3 and D4 connected by half bridge are added.
- the connection point of the diodes D3 and D4 is the AC input end 3d. That is, the converter circuit 3A has two DC output ends 3a and 3b and two AC input ends 3c and 3d.
- the AC input terminal 3d is connected to the other side of the AC power supply 100 together with the AC output terminal 4c in the inverter circuit 4.
- the diodes D1 and D2 connected in half-bridge and the diodes D3 and D4 connected in half-bridge form a full-wave rectifier circuit.
- Other configurations are the same as or equivalent to those of the power conversion device 1 shown in FIG. 1, and the same or equivalent components are designated by the same reference numerals, and duplicate explanations are omitted.
- the AC input end 3d may be referred to as a "second AC input end".
- the diode D3 and the freewheeling diode of the semiconductor switching element Up are connected in parallel to each other when viewed from the AC power supply 100.
- the converter circuit 3A shown in FIG. 7 is versatile as a circuit for full-wave rectifying single-phase alternating current. Therefore, there are many commercially available parts as a 4in1 module in which four diode elements are fully bridge-connected. Therefore, in order to obtain the effect of cost reduction, the configuration of the power conversion device 1A of FIG. 7 may be adopted.
- the converter circuit has the third and fourth diodes connected in full bridge together with the first and second diodes.
- the connection point between the third diode and the fourth diode constitutes the second AC input end, and the second AC input end is connected to the other side of the AC power supply.
- the flow rate of the power supply current can be increased by appropriately controlling the inverter circuit. As a result, it is possible to suppress an increase in cost and an increase in size of the device while suppressing harmonic components included in the power supply current.
- the first to fourth diodes provided in the converter circuit may be configured as a 4in1 module. If such a 4in1 module is used, the effect of cost reduction can be obtained.
- FIG. 8 is a diagram showing a configuration example of the refrigeration cycle application device 900 according to the third embodiment.
- the refrigeration cycle application device 900 according to the third embodiment includes the power conversion device 1 described in the first embodiment.
- the refrigeration cycle application device 900 according to the first embodiment can be applied to products including a refrigeration cycle such as an air conditioner, a refrigerator, a freezer, and a heat pump water heater.
- a refrigeration cycle such as an air conditioner, a refrigerator, a freezer, and a heat pump water heater.
- the components having the same functions as those of the first embodiment are designated by the same reference numerals as those of the first embodiment.
- the compressor 130 having a built-in motor 110, the four-way valve 902, the indoor heat exchanger 906, the expansion valve 908, and the outdoor heat exchanger 910 form a refrigerant pipe 912 according to the first embodiment. It is attached via.
- a compression mechanism 904 for compressing the refrigerant and a motor 110 for operating the compression mechanism 904 are provided inside the compressor 130.
- the refrigeration cycle applicable device 900 can perform heating operation or cooling operation by switching operation of the four-way valve 902.
- the compression mechanism 904 is driven by a motor 110 that is controlled at a variable speed.
- the refrigerant is pressurized by the compression mechanism 904 and sent out, and passes through the four-way valve 902, the indoor heat exchanger 906, the expansion valve 908, the outdoor heat exchanger 910 and the four-way valve 902. Return to the compression mechanism 904.
- the refrigerant is pressurized by the compression mechanism 904 and sent out, and passes through the four-way valve 902, the outdoor heat exchanger 910, the expansion valve 908, the indoor heat exchanger 906 and the four-way valve 902. Return to the compression mechanism 904.
- the indoor heat exchanger 906 acts as a condenser to release heat, and the outdoor heat exchanger 910 acts as an evaporator to absorb heat.
- the outdoor heat exchanger 910 acts as a condenser to release heat, and the indoor heat exchanger 906 acts as an evaporator to absorb heat.
- the expansion valve 908 depressurizes the refrigerant and expands it.
- the refrigeration cycle application device 900 according to the third embodiment has been described as having the power conversion device 1 described in the first embodiment, the present invention is not limited to this.
- the power conversion device 1A shown in FIG. 7 may be provided. Further, as long as the control method of the first embodiment can be applied, a power conversion device other than the power conversion devices 1 and 1A may be used.
- the configuration shown in the above embodiments is an example, and can be combined with another known technique, can be combined with each other, and does not deviate from the gist. It is also possible to omit or change a part of the configuration.
- 1,1A power converter 2 control unit, 3,3A converter circuit, 3a, 3b DC output end, 3c, 3d AC input end, 4 inverter circuit, 4a, 4b DC input end, 4c, 4d, 4e AC output end 5, Reactor, 6 Condenser, 7, 8 Current detection unit, 9, 11 Voltage detection unit, 10 Zero cross detection unit, 22 Motor control unit, 23 Converter output control unit, 24 Voltage command value correction unit, 25 PWM control unit, 50 , 50A motor drive, 100 AC power supply, 110 motor, 120 equipment, 130 compressor, 221 position sensorless control unit, 222 integrator, 223 coordinate conversion unit, 224,225 subtractor, 231 PAM control unit, 300 processor, 302 Memory, 303 processing circuit, 304 interface, D1, D2, D3, D4 diode, Up, Un, Vp, Vn, Wp, Wn semiconductor switching element.
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Abstract
Description
図1は、実施の形態1に係る電力変換装置1の構成例を示す図である。電力変換装置1は、交流電源100及び機器120に接続される。機器120の一例は圧縮機であり、機器120の他の一例はファンである。機器120は、モータ110を有する。電力変換装置1は、交流電源100から印加される電源電圧を所望の振幅及び位相を有する交流電圧に変換してモータ110に印加する。
Dw *=Dw(V) *+Du * …(4)
図7は、実施の形態2に係る電力変換装置1Aの構成例を示す図である。図7では、図1に示すコンバータ回路3がコンバータ回路3Aに置き替えられている。電力変換装置1Aと、機器120が備えるモータ110とによって、モータ駆動装置50Aが構成される。
図8は、実施の形態3に係る冷凍サイクル適用機器900の構成例を示す図である。実施の形態3に係る冷凍サイクル適用機器900は、実施の形態1で説明した電力変換装置1を備える。実施の形態1に係る冷凍サイクル適用機器900は、空気調和機、冷蔵庫、冷凍庫、ヒートポンプ給湯器といった冷凍サイクルを備える製品に適用することが可能である。なお、図8において、実施の形態1と同様の機能を有する構成要素には、実施の形態1と同一の符号を付している。
Claims (10)
- ハーフブリッジ接続される第1及び第2のダイオードを有し、第1の交流入力端、並びに第1及び第2の直流出力端を有し、前記第1の交流入力端が交流電源の一方側に接続されるコンバータ回路と、
一端が前記第1の直流出力端に接続され、他端が前記第2の直流出力端に接続されるコンデンサと、
三相ブリッジ接続される複数の半導体スイッチング素子を有し、第1及び第2の直流入力端、並びに第1から第3の交流出力端を有し、前記第1の直流入力端が前記一端に接続され、前記第2の直流入力端が前記他端に接続され、前記第1から第3の交流出力端が負荷であるモータに接続され、前記第1の交流出力端が前記交流電源の他方側に接続されるインバータ回路と、
を備えた電力変換装置。 - 前記コンバータ回路と、前記インバータ回路における前記第1の交流出力端を有するレグとによって全波整流回路が構成される
請求項1に記載の電力変換装置。 - 前記インバータ回路は、モータ制御の動作とコンバータ出力制御の動作とを同時に行う
請求項1又は2に記載の電力変換装置。 - 前記インバータ回路において、前記第1の交流出力端を有するレグが前記コンバータ出力制御の動作を行う
請求項3に記載の電力変換装置。 - 前記コンバータ回路は、前記第1及び第2のダイオードと共にフルブリッジ接続される第3及び第4のダイオードを有し、
前記第3のダイオードと前記第4のダイオードとの接続点は第2の交流入力端を構成し、前記第2の交流入力端は前記交流電源の他方側に接続される
請求項1、3又は4に記載の電力変換装置。 - 前記第1から第4のダイオードは、4in1モジュールとして構成されている
請求項5に記載の電力変換装置。 - 前記インバータ回路の動作を制御する制御部を備え、
前記制御部は、
前記インバータ回路を制御するためのV結線相当の電圧指令値を生成するモータ制御部と、
前記コンバータ回路の出力を制御するための制御信号を生成するコンバータ出力制御部と、
を備える請求項1から6の何れか1項に記載の電力変換装置。 - 前記制御部は、
前記制御信号に基づいて、前記V結線相当の電圧指令値を補正する電圧指令値補正部を備える
請求項7に記載の電力変換装置。 - 請求項1から8の何れか1項に記載の電力変換装置を備えるモータ駆動装置。
- 請求項1から8の何れか1項に記載の電力変換装置を備える冷凍サイクル適用機器。
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US18/252,414 US20230318489A1 (en) | 2021-01-06 | 2021-01-06 | Power converter, motor driver, and refrigeration cycle applied equipment |
JP2022573833A JP7341359B2 (ja) | 2021-01-06 | 2021-01-06 | 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 |
CN202180087847.6A CN116686202A (zh) | 2021-01-06 | 2021-01-06 | 电力转换装置、马达驱动装置以及制冷循环应用设备 |
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Citations (4)
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JPH06339279A (ja) * | 1993-04-02 | 1994-12-06 | Mitsubishi Electric Corp | 電力変換装置 |
JPH10225144A (ja) * | 1997-02-05 | 1998-08-21 | Nippon Electric Ind Co Ltd | 3アームupsのゲート制御方法 |
JP2008061411A (ja) * | 2006-08-31 | 2008-03-13 | Daikin Ind Ltd | 電力変換装置 |
JP2012184579A (ja) * | 2011-03-04 | 2012-09-27 | Yanmar Co Ltd | 電動作業機 |
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JP6339279B1 (ja) | 2017-08-15 | 2018-06-06 | 株式会社 参創ハウテック | 床ガラリ及び床ガラリの製造方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH06339279A (ja) * | 1993-04-02 | 1994-12-06 | Mitsubishi Electric Corp | 電力変換装置 |
JPH10225144A (ja) * | 1997-02-05 | 1998-08-21 | Nippon Electric Ind Co Ltd | 3アームupsのゲート制御方法 |
JP2008061411A (ja) * | 2006-08-31 | 2008-03-13 | Daikin Ind Ltd | 電力変換装置 |
JP2012184579A (ja) * | 2011-03-04 | 2012-09-27 | Yanmar Co Ltd | 電動作業機 |
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