WO2016132427A1 - 電力変換装置 - Google Patents
電力変換装置 Download PDFInfo
- Publication number
- WO2016132427A1 WO2016132427A1 PCT/JP2015/054112 JP2015054112W WO2016132427A1 WO 2016132427 A1 WO2016132427 A1 WO 2016132427A1 JP 2015054112 W JP2015054112 W JP 2015054112W WO 2016132427 A1 WO2016132427 A1 WO 2016132427A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- phase
- voltage
- voltage command
- command
- calculation process
- Prior art date
Links
Images
Classifications
-
- 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
- H02M1/0043—Converters switched with a phase shift, i.e. interleaved
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02M7/493—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 the static converters being arranged for operation in parallel
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02M7/5387—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
- 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
- H02P21/22—Current control, e.g. using a current control loop
-
- 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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
-
- 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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
- H02P25/024—Synchronous motors controlled by supply frequency
-
- 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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/22—Multiple windings; Windings for more than three phases
-
- 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
-
- 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
- H02P27/08—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 with pulse width modulation
- H02P27/085—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 with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
-
- 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
- H02M1/0009—Devices or circuits for detecting current in 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
- H02M3/1586—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
Definitions
- the present invention relates to a power conversion device including a current detector, and relates to a power conversion device that improves current detection accuracy by the current detector.
- Patent Document 1 discloses the following technique.
- the phase difference of the PWM command signal between the first inverter unit and the second inverter unit is set to 180 °, and the first two-phase switching control is performed so that the duty ratio of the smallest phase is 0%.
- the ripple current of the capacitor is reduced (see paragraphs [0044] to [0061] of Patent Document 1).
- phase difference of the PWM command signal between the first inverter unit and the second inverter unit is set to 180 °, and the second two-phase switching control is performed so that the duty ratio of the largest phase is 100%.
- modulation the ripple current of the capacitor is reduced (see paragraphs [0062] to [0078] of Patent Document 1).
- noise and vibration are generated from the AC rotating machine as a result of noise being mixed into the detection value detected by the current detector.
- the present invention has been made to solve the above-described problems, and is a power conversion capable of improving the accuracy of current detection by a current detector as compared with the conventional one while suppressing ripple current of a smoothing capacitor.
- the object is to obtain a device.
- a power conversion device is a power conversion device connected to a DC power source that outputs a DC voltage and an AC rotating machine having a first three-phase winding and a second three-phase winding.
- First power having a potential side switching element and a first low potential side switching element, converting a DC voltage supplied from a DC power source to a first AC voltage, and applying the first AC voltage to the first three-phase winding.
- the first three A first current detector for detecting a first three-phase current flowing in the winding; and a second current detector for detecting a second three-phase current flowing in the second three-phase winding
- the control unit includes an alternating current Based on the control command to the rotating machine, the first three-phase voltage command to the first three-phase winding and the second three-phase voltage command to the second three-phase winding are calculated, and the calculated first three-phase A voltage command calculator that outputs a voltage command and a second three-phase voltage command, and a first three-phase voltage applied to the first three-phase winding from the first three-phase voltage command input from the voltage command calculator.
- An offset calculator that outputs the calculated second three-phase applied voltage, a first three-phase applied voltage that is input from the offset calculator, By comparing the transmission signal, the first switching signal is output to the first high potential side switching element and the first low potential side switching element, and the second three-phase applied voltage input from the offset calculator, A switching signal generator that outputs a second switching signal to the second high potential side switching element and the second low potential side switching element by comparing the first carrier signal and a second carrier signal having a phase difference of 180 ° And the voltage commands of the first three-phase voltage command input from the voltage command calculator are set as the first maximum phase voltage command, the first intermediate phase voltage command, and the first minimum phase voltage command in descending order.
- the offset calculation is performed. Is the first minimum phase when the first difference value is greater than or equal to a preset reference voltage threshold according to the first difference value that is the difference between the first intermediate phase voltage command and the first minimum phase voltage command.
- the voltage applied to the phase corresponding to the first minimum phase voltage command is set to the reference voltage threshold value and the first voltage value.
- Executing a second calculation process for calculating the first three-phase applied voltage from the first three-phase voltage command so as to be equal to or higher than a reference voltage lower limit value which is the sum of the minimum value of one carrier wave signal and a second intermediate phase According to the second difference value that is the difference between the voltage command and the second minimum phase voltage command, the second difference value
- all voltage commands of the second three-phase voltage command are set so that the voltage applied to the phase corresponding to the second minimum phase voltage command is equal to the minimum value of the second carrier signal.
- the third calculation process for calculating the second three-phase applied voltage is performed by changing the same amount by the same amount.
- the phase corresponding to the second minimum phase voltage command is executed.
- a fourth calculation process for calculating the second three-phase applied voltage is executed from the second three-phase voltage command so that the voltage applied to the second voltage is equal to or higher than the reference voltage lower limit value.
- the first calculation processing corresponding to the first two-phase modulation is changed to the second calculation processing. If the first three-phase applied voltage is calculated from the first three-phase voltage command, and the second intermediate-phase voltage command and the second minimum-phase voltage command approach each other in the second three-phase voltage command, the first By switching from the third calculation process corresponding to the two-phase modulation to the fourth calculation process, the second three-phase applied voltage is calculated from the second three-phase voltage command.
- the first carrier signal, the second carrier signal, the first three-phase applied voltage, the second three-phase applied voltage, the first bus current, the second bus current, and the bus It is explanatory drawing which shows the relationship with an electric current sum. It is explanatory drawing for comparing with FIG. In Embodiment 7 of this invention, it is explanatory drawing which shows the relationship between the direct current which is an output current of DC power supply, the ripple current which is the output current of a smoothing capacitor, and a bus current sum. It is explanatory drawing for comparing with FIG. In Embodiment 7 of the present invention, the first three-phase applied voltage and the second three-phase output from the offset calculator when the offset calculator executes the sixth calculation process and the seventh calculation process while alternately switching them. It is explanatory drawing which shows an applied voltage.
- FIG. 1 is a configuration diagram illustrating the entire power conversion device according to Embodiment 1 of the present invention.
- FIG. 1 also shows an AC rotating machine 1 and a DC power supply 2 connected to the power conversion apparatus according to the first embodiment.
- the power conversion device includes a smoothing capacitor 3, a first power converter 4a, a second power converter 4b, a control unit 5, a first current detector 9a, and a second current.
- a detector 9b is provided.
- the AC rotating machine 1 is a three-phase AC rotating machine, and includes a first three-phase winding composed of a U-phase winding U1, a V-phase winding V1, and a W-phase winding W1, and U-phase windings U2, V A second three-phase winding composed of a phase winding V2 and a W-phase winding W2. Moreover, in the AC rotating machine 1, the first three-phase winding and the second three-phase winding are housed in the stator without being electrically connected.
- a specific example of the AC rotating machine 1 includes a permanent magnet synchronous rotating machine, an induction rotating machine, or a synchronous reluctance rotating machine.
- the present invention can be applied to any type of AC rotary machine as long as it is an AC rotary machine having two three-phase windings.
- the DC power supply 2 outputs DC voltage Vdc to first power converter 4a and second power converter 4b.
- the DC power supply 2 includes all devices that output a DC voltage, such as a battery, a DC-DC converter, a diode rectifier, and a PWM rectifier.
- the smoothing capacitor 3 is provided in a state of being connected in parallel to the DC power supply 2 in order to suppress fluctuations in the bus current and realize a stable DC current. Although the smoothing capacitor 3 is not shown in detail in FIG. 1, an equivalent series resistance Rc and a lead inductance Lc exist in addition to the true capacitor capacitance C.
- the first power converter 4a has an inverse conversion circuit (that is, an inverter). Specifically, the first power converter 4a includes a first high potential side switching element composed of switching elements Sup1, Svp1 and Swp1, and a first low potential side switching composed of switching elements Sun1, Svn1 and Swn1. Device.
- a semiconductor switch such as an IGBT, a bipolar transistor or a MOS power transistor and a diode connected in antiparallel are used. Is mentioned.
- the first power converter 4a is controlled to switch the first high-potential side switching element and the first low-potential side switching element on or off in accordance with the first switching signal input from the control unit 5, so that the DC power supply 2 converts the DC voltage Vdc input from 2 into an AC voltage. Moreover, the 1st three-phase electric current flows into a 1st three-phase winding because the 1st power converter 4a applies the voltage after conversion to a 1st three-phase winding.
- the first three-phase current is composed of a U-phase current Iu1, a V-phase current Iv1, and a W-phase current Iw1.
- the first switching signal is composed of switching signals Qup1 to Qwn1 (that is, switching signals Qup1, Qun1, Qvp1, Qvn1, Qwp1 and Qwn1).
- the switching signals Qup1, Qvp1 and Qwp1 are switching signals for switching the switching elements Sup1, Svp1 and Swp1 on or off, respectively.
- the switching signals Qun1, Qvn1, and Qwn1 are switching signals for switching the switching elements Sun1, Svn1, and Swn1 on and off, respectively.
- the second power converter 4b has an inverse conversion circuit (that is, an inverter). Specifically, the second power converter 4b includes a second high potential side switching element composed of switching elements Sup2, Svp2 and Swp2, and a second low potential side switching composed of switching elements Sun2, Svn2 and Swn2. Device.
- a semiconductor switch such as an IGBT, a bipolar transistor or a MOS power transistor and a diode connected in antiparallel are used. Is mentioned.
- the second power converter 4b is configured to switch the second high-potential side switching element and the second low-potential side switching element on or off according to the second switching signal input from the control unit 5, so that the DC power supply 2 converts the DC voltage Vdc input from 2 into an AC voltage.
- the second power converter 4b applies the converted voltage to the second three-phase winding, so that a second three-phase current flows through the second three-phase winding.
- the second three-phase current is composed of a U-phase current Iu2, a V-phase current Iv2, and a W-phase current Iw2.
- the second switching signal is composed of switching signals Qup2 to Qwn2 (that is, switching signals Qup2, Qun2, Qvp2, Qvn2, Qwp2 and Qwn2).
- the switching signals Qup2, Qvp2 and Qwp2 are switching signals for switching the switching elements Sup2, Svp2 and Swp2 on or off, respectively.
- the switching signals Qun2, Qvn2, and Qwn2 are switching signals for switching the switching elements Sun2, Svn2, and Swn2 on and off, respectively.
- the control unit 5 includes a voltage command calculator 6, an offset calculator 7 including a first offset calculator 7 a and a second offset calculator 7 b, and a switching signal generator 8.
- the voltage command calculator 6 is a first command to the first three-phase winding as a voltage command for applying a voltage to the first three-phase winding and the second three-phase winding in order to drive the AC rotating machine 1.
- the three-phase voltage command and the second three-phase voltage command to the second three-phase winding are calculated based on the input control command to the AC rotating machine 1.
- the voltage command calculator 6 outputs the calculated first three-phase voltage command to the first offset calculator 7a, and outputs the calculated second three-phase voltage command to the second offset calculator 7b.
- the first three-phase voltage command includes a U-phase voltage command Vu1, a V-phase voltage command Vv1, and a W-phase voltage command Vw1.
- the second three-phase voltage command includes a U-phase voltage command Vu2, a V-phase voltage command Vv2, and a W-phase voltage command Vw2.
- a current command to the AC rotating machine 1 is set as a control command to the AC rotating machine 1 input to the voltage command calculator 6.
- the voltage command computing unit 6 performs the first three-phase voltage by proportional-integral control so that the deviation between the set current command and the first three-phase current detected by the first current detector 9a becomes zero. Calculate the command.
- the voltage command calculator 6 performs the second three-phase voltage command by proportional-integral control so that the deviation between the set current command and the second three-phase current detected by the second current detector 9b becomes zero. Is calculated. That is, the voltage command calculator 6 calculates the first three-phase voltage command and the second three-phase voltage command by current feedback control.
- the first offset calculator 7a executes either one of the first calculation process and the second calculation process, so that the first three-phase winding is obtained from the first three-phase voltage command input from the voltage command calculator 6.
- the first three-phase applied voltage to be applied to is calculated.
- the first offset calculator 7 a outputs the calculated first three-phase applied voltage to the switching signal generator 8.
- the first three-phase applied voltage includes a U-phase applied voltage Vu1 ', a V-phase applied voltage Vv1', and a W-phase applied voltage Vw1 '.
- FIG. 2 is a flowchart showing an operation when the first offset calculator 7a according to Embodiment 1 of the present invention calculates the first three-phase applied voltage.
- FIG. 3 is an explanatory diagram showing the first three-phase voltage command output from the voltage command calculator 6 and the first three-phase applied voltage output from the first offset calculator 7a according to Embodiment 1 of the present invention. .
- step S120 the first offset calculator 7a sets the first maximum phase voltage command Vmax1, the voltage commands of the first three-phase voltage command input from the voltage command calculator 6 in descending order.
- the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1 are used.
- step S121 the first offset calculator 7a calculates the difference between the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1, and determines whether the calculated difference is equal to or greater than the reference voltage threshold Vth. To do.
- the reference voltage threshold value Vth will be described later.
- step S121 if the first offset calculator 7a determines that the calculated difference is greater than or equal to the reference voltage threshold Vth (ie, YES), the process proceeds to step S122, where the calculated difference is less than the reference voltage threshold Vth. If it is determined that NO (that is, NO), the process proceeds to step S123.
- the first offset calculator 7a calculates the first three-phase applied voltage by executing the first calculation process. Specifically, the first offset calculator 7a subtracts the first minimum phase voltage command Vmin1 from each voltage command of the first three-phase voltage command, and further adds the minimum value of the first carrier wave signal C1. The first three-phase applied voltage is calculated.
- the minimum value of the first carrier signal C1 is ⁇ 0.5 Vdc.
- step S122 the first offset calculator 7a determines that the voltage applied to the phase corresponding to the first minimum phase voltage command Vmin1 is equal to the minimum value (here, ⁇ 0.5 Vdc) of the first carrier signal C1.
- the first three-phase applied voltage is calculated by shifting all voltage commands of the first three-phase voltage command equally in the negative direction.
- step S123 the first offset calculator 7a calculates the first three-phase applied voltage by executing the second calculation process. Specifically, the first offset calculator 7a uses each voltage command of the first three-phase voltage command as it is as the first three-phase applied voltage.
- step S123 the first offset calculator 7a sets the first three-phase applied voltage to the first three-phase applied voltage without shifting all the voltage commands of the first three-phase voltage command in the positive and negative directions. Calculate the phase applied voltage.
- each voltage command of the first three-phase voltage command is shown in the upper part of FIG. 3, and the waveform of each applied voltage of the first three-phase applied voltage is shown in the lower part of FIG.
- the horizontal axis indicates the voltage phase ⁇ v [deg]
- the vertical axis indicates the voltage value displayed as a multiple of the DC voltage Vdc.
- the first three-phase voltage command is a balanced three-phase AC voltage.
- each voltage command of the first three-phase voltage command is a sine wave waveform with 0 as a reference. If the first calculation process is executed for each applied voltage of the first three-phase applied voltage, the voltage applied to the phase corresponding to the first minimum phase voltage command Vmin1 becomes ⁇ 0.5 Vdc. Further, if the second calculation process is executed, each applied voltage of the first three-phase applied voltage coincides with each voltage command of the first three-phase voltage command.
- the second offset calculator 7b executes either one of the third calculation process and the fourth calculation process, so that the second three-phase winding is obtained from the second three-phase voltage command input from the voltage command calculator 6.
- the second three-phase applied voltage to be applied to is calculated.
- the second offset calculator 7 b outputs the calculated second three-phase applied voltage to the switching signal generator 8.
- the second three-phase applied voltage includes a U-phase applied voltage Vu2 ', a V-phase applied voltage Vv2', and a W-phase applied voltage Vw2 '.
- FIG. 4 is a flowchart showing an operation when the second offset calculator 7b according to Embodiment 1 of the present invention calculates the second three-phase applied voltage.
- FIG. 5 is an explanatory diagram showing the second three-phase voltage command output from the voltage command calculator 6 and the second three-phase applied voltage output from the second offset calculator 7b in Embodiment 1 of the present invention. .
- step S130 the second offset calculator 7b outputs the second maximum phase voltage command Vmax2, the voltage commands of the second three-phase voltage command input from the voltage command calculator 6 in descending order.
- the second intermediate phase voltage command Vmid2 and the second minimum phase voltage command Vmin2 are used.
- step S131 the second offset calculator 7b calculates the difference between the second intermediate phase voltage command Vmid2 and the second minimum phase voltage command Vmin2, and determines whether the calculated difference is equal to or greater than the reference voltage threshold Vth. To do.
- step S131 if the second offset calculator 7b determines that the calculated difference is greater than or equal to the reference voltage threshold Vth (ie, YES), the process proceeds to step S132, where the calculated difference is less than the reference voltage threshold Vth. If it is determined that NO (that is, NO), the process proceeds to step S133.
- the second offset calculator 7b calculates the second three-phase applied voltage by executing a third calculation process. Specifically, the second offset calculator 7b subtracts the second minimum phase voltage command Vmin2 from each voltage command of the second three-phase voltage command, and further adds the minimum value of the second carrier signal C2. The second three-phase applied voltage is calculated.
- the minimum value of the second carrier signal C2 is ⁇ 0.5 Vdc.
- step S132 the second offset calculator 7b determines that the voltage applied to the phase corresponding to the second minimum phase voltage command Vmin2 is equal to the minimum value (here, ⁇ 0.5 Vdc) of the second carrier signal C2.
- the second three-phase applied voltage is calculated by shifting all voltage commands of the second three-phase voltage command equally in the negative direction.
- step S133 the second offset calculator 7b calculates the second three-phase applied voltage by executing the fourth calculation process. Specifically, the second offset calculator 7b uses each voltage command of the second three-phase voltage command as it is as the second three-phase applied voltage.
- step S133 the second offset calculator 7b sets the second three-phase applied voltage to the second three-phase applied voltage without shifting all the voltage commands of the second three-phase voltage command in the positive and negative directions. Calculate the phase applied voltage.
- FIG. 5 shows the waveform of each voltage command of the second three-phase voltage command, and the lower part of FIG. 5 shows the waveform of each applied voltage of the second three-phase voltage.
- the horizontal axis indicates the voltage phase ⁇ v [deg]
- the vertical axis indicates the voltage value displayed as a multiple of the DC voltage Vdc.
- the second three-phase voltage command is a balanced three-phase AC voltage.
- each voltage command of the second three-phase voltage command is a sine wave waveform with 0 as a reference. If the third calculation process is executed for each applied voltage of the second three-phase applied voltage, the voltage applied to the phase corresponding to the second minimum phase voltage command Vmin2 becomes ⁇ 0.5 Vdc. Further, if the fourth calculation process is executed, each applied voltage of the second three-phase applied voltage coincides with each voltage command of the second three-phase voltage command.
- the switching signal generator 8 compares the first three-phase applied voltage input from the first offset calculator 7a with the first carrier wave signal C1, so that the first high potential side switching element and the first low potential side A first switching signal is output to each of the switching elements. That is, the switching signal generator 8 outputs the switching signals Qup1 to Qwn1 in accordance with each applied voltage of the first three-phase applied voltage.
- the switching signal generator 8 compares the second three-phase applied voltage input from the second offset calculator 7b with the first carrier signal C1 and the second carrier signal C2 having a phase difference of 180 °.
- the second switching signal is output to each of the second high potential side switching element and the second low potential side switching element. That is, the switching signal generator 8 outputs the switching signals Qup2 to Qwn2 in accordance with each applied voltage of the second three-phase applied voltage.
- the maximum value of the first carrier signal C1 is larger than the maximum value of each voltage command of the first three-phase voltage command, and the minimum value of the first carrier signal C1 is the value of each voltage command of the first three-phase voltage command. Less than the minimum value.
- the maximum value of the second carrier signal C2 is larger than the maximum value of each voltage command of the second three-phase voltage command, and the minimum value of the second carrier signal C2 is each voltage command of the second three-phase voltage command. Is smaller than the minimum value.
- the first carrier signal C1 and the second carrier signal C2 are set so that the maximum value is 0.5 Vdc and the minimum value is ⁇ 0.5 Vdc. Further, as can be seen from FIGS. 3 and 5, for each voltage command of the first three-phase voltage command and the second three-phase voltage command, the maximum value is 0.3 Vdc and the minimum value is ⁇ 0.3 Vdc. Is set.
- FIG. 6A is an explanatory diagram showing a first switching signal output by the switching signal generator 8 according to Embodiment 1 of the present invention.
- FIG. 6B is an explanatory diagram illustrating a second switching signal output from the switching signal generator 8 according to Embodiment 1 of the present invention.
- FIG. 6A shows waveforms of the first carrier signal C1, the first three-phase applied voltage, and the switching signals Qup1 to Qwn1.
- the first carrier wave signal C1 is a triangular wave having a carrier period Tc, and at time t1 and t3, the voltage value becomes a minimum value (here, ⁇ 0.5 Vdc), and at time t1 and time t3. At an intermediate time t2, the voltage value becomes the maximum value (here, 0.5 Vdc).
- the switching signal generator 8 compares each applied voltage of the first three-phase applied voltage with the first carrier signal C1, and outputs the switching signals Qup1 to Qwn1 according to the comparison result.
- the switching signal generator 8 has a range in which the U-phase applied voltage Vu1 ′ is larger than the first carrier signal C1.
- FIG. 6B shows waveforms of the second carrier signal C2, the second three-phase applied voltage, and the switching signals Qup2 to Qwn2.
- the second carrier wave signal C2 is a triangular wave having a carrier period Tc, and at time t1 and t3, the voltage value becomes the maximum value (here, 0.5 Vdc), which is intermediate between time t1 and time t3. At time t2, the voltage value becomes the minimum value (here, -0.5 Vdc).
- the second carrier signal C2 has a phase difference of 180 ° with the first carrier signal C1 when the carrier cycle Tc is represented by 360 °.
- the switching signal generator 8 compares each applied voltage of the second three-phase applied voltage with the second carrier signal C2, and outputs switching signals Qup2 to Qwn2 according to the comparison result.
- the first current detector 9a detects each current of the first three-phase current flowing through the first three-phase winding.
- a resistance element for current detection is connected in series to each switching element of the first low potential side switching element.
- the current detection resistor elements are provided so as to correspond to the three-phase phases.
- the element may be provided so as to correspond to two of the three phases. That is, a current detection resistor element may be provided so as to correspond to at least two phases of the first power converter 4a.
- the second current detector 9b detects each current of the second three-phase current flowing in the second three-phase winding.
- a resistance element for current detection is connected in series to each switching element of the second low potential side switching element.
- the current detection resistor elements are provided so as to correspond to the three-phase phases.
- the current detection resistor is utilized by utilizing the fact that the sum of the second three-phase currents is zero.
- the element may be provided so as to correspond to two of the three phases. That is, a current detection resistor element may be provided so as to correspond to at least two phases of the second power converter 4b.
- the first current detector 9a detects the first three-phase current at time t2 when all the first low potential side switching elements are turned on. In FIG. 6A, at time t2, the first carrier signal C1 has a maximum value.
- the second current detector 9b detects the second three-phase current at time t1 and time t3, which is the timing when all the second low potential side switching elements are turned on.
- the second carrier signal C2 has a maximum value.
- the time required for each of the first current detector 9a and the second current detector 9b to detect a current is defined as an energization time ti.
- the energization time ti is a lower limit value of the energization time to the current detection resistor element determined in consideration of the ringing convergence time included in the detection waveform, the conversion time of the analog / digital converter, and the time required for sampling and holding. Yes, specifically, a value in a range from several ⁇ s to several tens of ⁇ s.
- FIG. 6A also shows a section A in which a time width of ti / 2 is provided behind time t1, which is the current detection timing of the second current detector 9b, and a time width of ti / 2 in front of time t3.
- Section C is shown.
- FIG. 6B shows a section B in which a time width is provided by ti / 2 before and after the time t2, which is the current detection timing of the first current detector 9a.
- each of the section A, the section B, and the section C is defined as a current detection period.
- the switching signals Qup2 to Qwn2 are switched from “0” to “1” and from “1” to “0”. , It is necessary not to occur in the current detection period. That is, it is necessary to prevent the second high potential side switching element and the second low potential side switching element from being switched on and off in the section B. Conversely, if switching occurs in the second power converter 4b during the current detection period, noise is mixed into the first three-phase current detected by the first current detector 9a. Cause vibration and noise.
- the switching signals Qup1 to Qwn1 are switched from “0” to “1” and from “1” to “0”. , It is necessary not to occur in the current detection period. In other words, it is necessary that the first high potential side switching element and the first low potential side switching element are not switched on and off in the sections A and C. Conversely, if switching occurs in the first power converter 4a during the current detection period, noise is mixed into the second three-phase current detected by the second current detector 9b. Cause vibration and noise.
- the reference voltage lower limit value Vlo does not cause switching in the second power converter 4b during the current detection period of the first current detector 9a, and does not cause switching in the current detection period of the second current detector 9b.
- 4a is a threshold for preventing switching, and is defined by the following equation using the reference voltage threshold Vth and the minimum value of the first carrier signal C1.
- Reference voltage lower limit Vlo Reference voltage threshold Vth + (Minimum value of the first carrier signal C1)
- the minimum value of the first carrier signal C1 is assumed to be ⁇ 0.5 Vdc, and in this case, the reference voltage lower limit value Vlo is represented by “Vth ⁇ 0.5 Vdc”. Is done.
- the applied voltage of the phase corresponding to the first minimum phase voltage command among the first three-phase applied voltages is the minimum of the first carrier signal C1. If it matches the value: That is, for the phase corresponding to the first minimum phase voltage command, the switching element on the high potential side is always off and the switching element on the low potential side is always on during the carrier cycle Tc of the first carrier signal C1. In the section A and the section C, no switching occurs in the first power converter 4a.
- the applied voltage of the phase corresponding to the second minimum phase voltage command among the second three-phase applied voltages is the minimum of the second carrier signal C2. If it matches the value: That is, for the phase corresponding to the second minimum phase voltage command, the high-potential side switching element is always off and the low-potential side switching element is always on during the carrier period Tc of the second carrier signal C2. In the section B, no switching occurs in the second power converter 4b.
- the reference voltage threshold Vth is assumed to be 0.1 Vdc.
- FIG. 7A is an explanatory diagram showing a first switching signal output by the switching signal generator 8 at the instant [1] in FIG.
- FIG. 7B is an explanatory diagram showing the second switching signal output from the switching signal generator 8 at the instant [1] in FIG. 5.
- FIG. 8A is an explanatory diagram showing the first switching signal output by the switching signal generator 8 at the instant [2] in FIG.
- FIG. 8B is an explanatory diagram showing a second switching signal output by the switching signal generator 8 at the instant [2] in FIG. 5.
- the first calculation process and the third calculation process are always selected instead of the second calculation process and the fourth calculation process. . Therefore, the first calculation process and the third calculation process are selected as much as possible within a range where there is no influence of noise in the first current detector 9a and the second current detector 9b.
- the first offset calculator 7a executes step S121 and executes step S122 as the first calculation process or executes step S123 as the second calculation process according to the execution result. .
- the first intermediate phase voltage command Vmid1 of the first three-phase applied voltages is handled.
- the waveform of each parameter in the carrier cycle Tc is as shown in FIG. 7A.
- switching of the switching signals Qup1 to Qwn1 does not occur in the sections A and C.
- the first offset calculator 7a executes step S121, and if the difference between the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1 is greater than or equal to the reference voltage threshold Vth, executes step S122. To do.
- the difference between the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1 is less than the reference voltage threshold Vth, it corresponds to the first intermediate phase voltage command Vmid1 of the first three-phase applied voltages.
- the first offset calculator 7a executes step S121, and if the difference between the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1 is less than the reference voltage threshold value Vth, executes step S123. To do. That is, the first offset calculator 7a uses each voltage command of the first three-phase voltage command as it is as the first three-phase applied voltage. As a result, each applied voltage of the first three-phase applied voltage is equal to or higher than the reference voltage lower limit value Vlo, so that switching of the switching signal does not occur in the sections A and C. As a result, vibration and noise of the AC rotating machine 1 can be suppressed.
- V-phase applied voltage Vv ⁇ b> 1 ′ has a value in the vicinity of 0.3 Vdc
- the applied voltage Vu1 ′ and the W-phase applied voltage Vw1 ′ are values in the vicinity of ⁇ 0.15 Vdc. That is, each applied voltage of the first three-phase applied voltage is equal to each voltage command of the first three-phase voltage command, and thus becomes equal to or higher than the reference voltage lower limit value Vlo.
- the waveform of each parameter in the carrier period Tc is as shown in FIG. 8A.
- switching of the switching signals Qup1 to Qwn1 does not occur in the sections A and C.
- the first offset calculator 7a executes step S121, and if the difference between the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1 is less than the reference voltage threshold Vth, executes the step S123. To do.
- the second offset calculator 7a executes step S131 and executes step S132 as the third calculation process or executes step S133 as the fourth calculation process according to the execution result. .
- the difference between the second intermediate phase voltage command Vmid2 and the second minimum phase voltage command Vmin2 is equal to or greater than the reference voltage threshold Vth, it corresponds to the second intermediate phase voltage command Vmid2 of the second three-phase applied voltage.
- the waveform of each parameter in the carrier cycle Tc is as shown in FIG. 7B. As can be seen from FIG. 7B, switching of the switching signals Qup2 to Qwn2 does not occur in the section B.
- the second offset calculator 7b executes step S131, and if the difference between the second intermediate phase voltage command Vmid2 and the second minimum phase voltage command Vmin2 is equal to or greater than the reference voltage threshold Vth, executes step S132. To do.
- the difference between the second intermediate phase voltage command Vmid2 and the second minimum phase voltage command Vmin2 is less than the reference voltage threshold Vth, it corresponds to the second intermediate phase voltage command Vmid2 of the second three-phase applied voltage.
- the second offset calculator 7b executes step S131, and if the difference between the second intermediate phase voltage command Vmid2 and the second minimum phase voltage command Vmin2 is less than the reference voltage threshold value Vth, executes step S133.
- the second offset calculator 7b uses each voltage command of the second three-phase voltage command as it is as the second three-phase applied voltage. Accordingly, each applied voltage of the second three-phase applied voltage is equal to or higher than the reference voltage lower limit value Vlo, and therefore switching of the switching signal does not occur in the section B. As a result, vibration and noise of the AC rotating machine 1 can be suppressed.
- V-phase applied voltage Vv2 ′ has a value in the vicinity of 0.3 Vdc
- U-phase The applied voltage Vu2 ′ and the W-phase applied voltage Vw2 ′ are values in the vicinity of ⁇ 0.15 Vdc. That is, each applied voltage of the second three-phase applied voltage is equal to each voltage command of the second three-phase voltage command, and thus becomes equal to or higher than the reference voltage lower limit value Vlo.
- the waveform of each parameter in the carrier cycle Tc is as shown in FIG. 8B.
- switching of the switching signals Qup2 to Qwn2 does not occur in the section B.
- the second offset calculator 7b executes step S131, and if the difference between the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1 is less than the reference voltage threshold value Vth, executes step S133. To do.
- FIG. 9 is an explanatory diagram for comparison with FIG.
- FIG. 10 is an explanatory diagram for comparison with FIG.
- FIG. 11A is an explanatory diagram for comparison with FIG. 8A.
- FIG. 11B is an explanatory diagram for comparison with FIG. 8B.
- FIG. 9 shows the first three-phase applied voltage obtained when the first two-phase modulation referred to in Patent Document 1 is performed with respect to the first three-phase voltage command.
- FIG. 10 shows the second three-phase applied voltage obtained when the first two-phase modulation referred to in Patent Document 1 is performed with respect to the second three-phase voltage command.
- the first three-phase applied voltage is configured by executing the second calculation process when the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1 approach each other.
- Each of the applied voltages does not fall below the reference voltage lower limit value Vlo. Therefore, switching of the switching signals Qup1 to Qwn1 does not occur in the current detection period of the second current detector 9b, so that vibration and noise generated from the AC rotating machine 1 can be reduced.
- the offset calculator has the first difference value set in advance according to the first difference value that is the difference between the first intermediate phase voltage command and the first minimum phase voltage command. All the voltages of the first three-phase voltage command so that the voltage applied to the phase corresponding to the first minimum phase voltage command is equal to the minimum value of the first carrier signal.
- the first calculation process for calculating the first three-phase applied voltage is executed by changing the command by the same amount. When the first difference value is less than the reference voltage threshold, the first minimum phase voltage command is handled.
- the first three-phase applied voltage is set so that the voltage applied to the phase to be applied is not less than the reference voltage lower limit value that is the sum of the reference voltage threshold value and the minimum value of the first carrier signal.
- a second calculation process for calculating is executed.
- the offset calculator when the second difference value is equal to or greater than the reference voltage threshold according to the second difference value that is the difference between the second intermediate phase voltage command and the second minimum phase voltage command, By changing all the voltage commands of the second three-phase voltage command by the same amount so that the voltage applied to the phase corresponding to the phase voltage command is equal to the minimum value of the second carrier signal, the second three-phase voltage command is changed.
- the third calculation process for calculating the phase applied voltage is executed and the second difference value is less than the reference voltage threshold, the voltage applied to the phase corresponding to the second minimum phase voltage command is equal to or greater than the reference voltage lower limit value.
- a fourth calculation process for calculating the second three-phase applied voltage is executed from the second three-phase voltage command.
- the offset calculator calculates the first three-phase applied voltage by setting all voltage commands of the first three-phase voltage command as the first three-phase applied voltage
- the second three-phase applied voltage is calculated by setting all voltage commands of the second three-phase voltage command to the second three-phase applied voltage.
- Embodiment 2 the first calculation process and the second calculation process are switched according to the difference between the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1, and the second intermediate phase voltage command A case has been described in which the third calculation process and the fourth calculation process are switched according to the difference between Vmid2 and the second minimum phase voltage command Vmin2.
- the first calculation process and the second calculation process are switched according to the voltage phase ⁇ v, and the third calculation process and the fourth calculation process are switched. The case where it comprises is demonstrated.
- FIG. 12 is a configuration diagram showing the entire power conversion device according to the second embodiment of the present invention.
- the power conversion device according to the second embodiment includes a smoothing capacitor 3, a first power converter 4a, a second power converter 4b, a control unit 5, a first current detector 9a, and a second current.
- a detector 9b is provided.
- the control unit 5 includes a voltage command calculator 6, an offset calculator 7 including a first offset calculator 7a and a second offset calculator 7b, a switching signal generator 8, and a voltage phase calculator 10. .
- the voltage phase calculator 10 calculates the voltage phase ⁇ v using the first three-phase voltage command input from the voltage command calculator 6.
- the voltage command calculator 6 outputs the calculated voltage phase ⁇ v to the first offset calculator 7a and the second offset calculator 7b.
- the voltage phase ⁇ v is calculated according to the following equation (1) using the first three-phase voltage command input from the voltage command calculator 6.
- the voltage phase calculator 10 converts each voltage command of the first three-phase voltage command into voltages V ⁇ and V ⁇ in the stationary biaxial coordinate system, and uses the voltages V ⁇ and V ⁇ according to the following equation (2).
- the voltage phase ⁇ v may be calculated.
- the voltage phase calculator 10 converts each voltage command of the first three-phase voltage command into voltages Vd and Vq in the rotating biaxial coordinate system, and uses the voltages Vd and Vq according to the following equation (3).
- the voltage phase ⁇ v may be calculated.
- ⁇ is the rotational phase of the AC rotating machine 1.
- the second embodiment exemplifies a case where the voltage phase ⁇ v is calculated using the first three-phase voltage command, but the voltage phase ⁇ v is calculated in the same manner even when the second three-phase voltage command is used. Can do.
- the voltage phase calculator 10 outputs an average value of the voltage phase calculated using the first three-phase voltage command and the voltage phase calculated using the second three-phase voltage command as the voltage phase ⁇ v. You may comprise.
- FIG. 13 is an explanatory diagram showing a first three-phase voltage command output from the voltage command calculator 6 and a first three-phase applied voltage output from the first offset calculator 7a according to Embodiment 2 of the present invention.
- FIG. 14 is a flowchart showing an operation when the first offset calculator 7a according to Embodiment 2 of the present invention calculates the first three-phase applied voltage.
- FIG. 15 is a flowchart showing an operation when the second offset calculator 7b in the second embodiment of the present invention calculates the second three-phase applied voltage.
- the waveform of the first three-phase voltage command output from the voltage command calculator 6 and the waveform of the first three-phase applied voltage output from the first offset calculator 7a Is the same as FIG.
- the first offset calculator 7a determines whether the voltage phase ⁇ v is within a specific range set in advance according to the voltage phase ⁇ v input from the voltage phase calculator 10. One of the two arithmetic processes is executed.
- the first offset calculator 7a has a value of the voltage phase ⁇ v in the range of 360- ⁇ to 360, the range of 0 to ⁇ , and the range of 120- ⁇ to 120 + ⁇ .
- the second calculation process is executed in the range and in the range from 240 ⁇ to 240 + ⁇ .
- the first offset calculator 7a executes the first calculation process when the value of the voltage phase ⁇ v is outside these ranges.
- the first offset calculator 7a switches between the first calculation process and the second calculation process in accordance with the voltage phase ⁇ v input from the voltage phase calculator 10.
- ⁇ is a fixed value and may be set in advance according to the first three-phase voltage command output from the voltage command calculator 6.
- the operation of calculating the first three-phase applied voltage by the first offset calculator 7a is as shown in FIG. As shown in FIG. 14, after performing step S120, the first offset calculator 7a proceeds to step S231.
- step S231 the first offset calculator 7a determines whether 360 ⁇ ⁇ ⁇ v or ⁇ v ⁇ ⁇ holds for the voltage phase ⁇ v input from the voltage phase calculator 10.
- step S123 If the first offset calculator 7a determines that 360 ⁇ ⁇ ⁇ v or ⁇ v ⁇ ⁇ is satisfied (that is, YES), the first offset calculator 7a proceeds to step S123 and executes the second calculation process. On the other hand, if the first offset calculator 7a determines that 360 ⁇ ⁇ ⁇ v or ⁇ v ⁇ ⁇ is not satisfied (that is, NO), the process proceeds to step S232.
- step S232 the first offset calculator 7a determines whether 120 ⁇ ⁇ ⁇ v ⁇ 120 + ⁇ is satisfied for the voltage phase ⁇ v input from the voltage phase calculator 10.
- the first offset calculator 7a determines that 120 ⁇ ⁇ ⁇ v ⁇ 120 + ⁇ is satisfied (that is, YES)
- the first offset calculator 7a proceeds to step S123 and executes the second calculation process.
- the process proceeds to step S233.
- step S233 the first offset calculator 7a determines whether or not 240 ⁇ ⁇ ⁇ v ⁇ 240 + ⁇ is satisfied for the voltage phase ⁇ v input from the voltage phase calculator 10.
- the first offset calculator 7a determines that 240 ⁇ ⁇ ⁇ v ⁇ 240 + ⁇ is satisfied (ie, YES)
- the first offset calculator 7a proceeds to step S123 and executes the second calculation process.
- the first offset calculator 7a determines that 240 ⁇ ⁇ ⁇ v ⁇ 240 + ⁇ is not satisfied (that is, NO)
- the first offset calculator 7a proceeds to step S122 and executes the first calculation process.
- this flowchart includes step S130, steps S241 to S243 similar to steps S231 to S233, step S132 for executing the third calculation process, and step S133 for executing the fourth calculation process. Composed.
- the second offset calculator 7b switches between the third calculation process and the fourth calculation process according to the voltage phase ⁇ v input from the voltage phase calculator 10. .
- the waveform of the second three-phase voltage command output from the voltage command calculator 6 and the waveform of the second three-phase applied voltage output from the second offset calculator 7b are the same as in FIG.
- the offset calculator is a voltage phase calculator instead of the difference between the first intermediate phase voltage command and the first minimum phase voltage command.
- one of the first calculation process and the second calculation process is executed depending on whether or not the voltage phase is within a specific range set in advance.
- the offset calculator has a voltage phase within a specific range in accordance with the voltage phase input from the voltage phase calculator instead of the difference between the second intermediate phase voltage command and the second minimum phase voltage command.
- one of the third calculation process and the fourth calculation process is executed. Thereby, the same effect as in the first embodiment can be obtained.
- Embodiment 3 In the third embodiment of the present invention, a case where the contents of the second calculation process and the fourth calculation process are different from those of the first and second embodiments will be described. In the third embodiment, description of points that are the same as in the first and second embodiments will be omitted, and the description will focus on points that are different from the first and second embodiments.
- the first offset calculator 7a causes the voltage applied to the phase corresponding to the first minimum phase voltage command Vmin1 to be equal to or higher than the reference voltage lower limit value Vlo in the second calculation process.
- the first three-phase applied voltage is calculated by changing all the voltage commands of the first three-phase voltage command by the same amount.
- the second offset calculator 7b uses the second three-phase voltage command so that the voltage applied to the phase corresponding to the second minimum phase voltage command Vmin2 is equal to or higher than the reference voltage lower limit value Vlo.
- the second three-phase applied voltage is calculated by changing all of the voltage commands by the same amount.
- the first offset calculator 7a uses the first three-phase voltage command so that the voltage applied to the phase corresponding to the first minimum phase voltage command Vmin1 matches the reference voltage lower limit value Vlo. The case where all the voltage commands are changed by the same amount is illustrated.
- the second offset calculator 7b outputs all the voltage commands of the second three-phase voltage command so that the voltage applied to the phase corresponding to the second minimum phase voltage command Vmin2 matches the reference voltage lower limit value Vlo. A case where the same amount is changed is illustrated.
- FIG. 16 is a flowchart showing an operation when the first offset calculator 7a in the third embodiment of the present invention calculates the first three-phase applied voltage.
- FIG. 17 is an explanatory diagram showing a first three-phase voltage command output from the voltage command calculator 6 and a first three-phase applied voltage output from the first offset calculator 7a according to Embodiment 3 of the present invention.
- FIG. 18 is a flowchart showing an operation when the second offset calculator 7b in the third embodiment of the present invention calculates the second three-phase applied voltage.
- FIG. 19 is an explanatory diagram showing the second three-phase voltage command output by the voltage command calculator 6 and the second three-phase applied voltage output by the second offset calculator 7b in Embodiment 3 of the present invention. .
- the first offset calculator 7a executes step S120, and then proceeds to step S121.
- the first offset calculator 7a executes step S121, and if the difference between the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1 is equal to or greater than the reference voltage threshold Vth, executes the step S122, If the difference between the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1 is less than the reference voltage threshold Vth, step S313 is executed.
- the reference voltage threshold Vth is greater in step S313. Larger by the amount added. Therefore, the applied voltage of the phase corresponding to the first minimum phase voltage command Vmin1 among the first three-phase applied voltages calculated by executing step S313 matches the reference voltage lower limit value Vlo.
- Step S313 is executed.
- the voltage Vw1 'applied to the W phase that is a phase corresponding to the first minimum phase voltage command Vmin1 matches the reference voltage lower limit value Vlo.
- the first offset calculator 7a determines the first three-phase voltage command so that the voltage applied to the phase corresponding to the first minimum phase voltage command Vmin1 is equal to the minimum value of the first carrier signal C1. All the voltage commands are shifted in the negative direction equally, and further, the reference voltage threshold Vth is added. Therefore, each applied voltage of the first three-phase applied voltage is equal to or higher than the reference voltage lower limit value Vlo, so that switching of the switching signals Qup1 to Qwn1 in the current detection period occurs similarly to the first embodiment. Absent.
- step S130 The operation of calculating the second three-phase applied voltage by the second offset calculator 7b is as shown in FIG. As can be seen from FIG. 18, this flowchart is composed of step S130, step S131, step S132 for executing the third calculation process, and step S323 for executing the fourth calculation process similar to step S313.
- step S313 The flowchart is composed of step S130, step S131, step S132 for executing the third calculation process, and step S323 for executing the fourth calculation process similar to step S313.
- the second offset calculator 7b calculates the second three-phase applied voltage in the same manner as the first offset calculator 7a. Therefore, as shown in FIG. 19, the waveform of the second three-phase voltage command output from the voltage command calculator 6 and the waveform of the second three-phase applied voltage output from the second offset calculator 7b are as shown in FIG. It will be the same.
- each applied voltage of the second three-phase applied voltage is also equal to or higher than the reference voltage lower limit value Vlo, so that switching of the switching signals Qup2 to Qwn2 in the current detection period occurs as in the first embodiment. There is nothing.
- the offset calculator in the second calculation process, is configured so that the voltage applied to the phase corresponding to the first minimum phase voltage command is equal to or higher than the reference voltage lower limit value.
- the first three-phase applied voltage is calculated by changing all of the three-phase voltage commands by the same amount.
- the offset calculator calculates all the voltage commands of the second three-phase voltage command so that the voltage applied to the phase corresponding to the second minimum phase voltage command is equal to or higher than the reference voltage lower limit value. Are changed by the same amount to calculate the second three-phase applied voltage. Thereby, the same effect as in the first embodiment can be obtained.
- the offset calculator calculates all voltages of the first three-phase voltage command in a negative direction in which the voltage applied to the phase corresponding to the first minimum phase voltage command approaches the reference voltage lower limit value. Change the command by the same amount. Further, in the fourth calculation process, the offset calculator calculates all the voltages of the second three-phase voltage command in the negative direction in which the voltage applied to the phase corresponding to the second minimum phase voltage command approaches the reference voltage lower limit value. Change the command by the same amount.
- the voltage applied to the phase corresponding to the first minimum phase voltage command is close to the minimum value of the first carrier wave signal, and by executing the fourth calculation process.
- the voltage applied to the phase corresponding to the second minimum phase voltage command is close to the minimum value of the second carrier signal.
- Embodiment 4 FIG.
- description of points that are the same as in the first to third embodiments will be omitted, and differences from the first to third embodiments will be mainly described.
- the first offset calculator 7a in the second calculation process, the voltage applied to the phase corresponding to the first minimum phase voltage command Vmin1 is not less than the reference voltage lower limit value Vlo, and All the voltage commands of the first three-phase voltage command are changed by the same amount so that the voltage applied to the phase corresponding to the first maximum phase voltage command Vmax1 is not more than the maximum value of the first carrier wave signal C1. Then, the first three-phase applied voltage is calculated.
- the second offset calculator 7b is configured such that the voltage applied to the phase corresponding to the second minimum phase voltage command Vmin2 is equal to or higher than the reference voltage lower limit value Vlo and the second maximum phase voltage command Vmax2 is set.
- the first offset calculator 7a includes the first three-phase signal so that the voltage applied to the phase corresponding to the first maximum phase voltage command Vmax1 matches the maximum value of the first carrier signal C1.
- the second offset calculator 7b performs all the second three-phase voltage command so that the voltage applied to the phase corresponding to the second maximum phase voltage command Vmax2 matches the maximum value of the second carrier signal C2.
- a case where the voltage commands are changed by the same amount is illustrated.
- FIG. 20 is a flowchart showing an operation when the first offset calculator 7a in the fourth embodiment of the present invention calculates the first three-phase applied voltage.
- FIG. 21 is an explanatory diagram illustrating a first three-phase voltage command output from the voltage command calculator 6 and a first three-phase applied voltage output from the first offset calculator 7a according to Embodiment 4 of the present invention.
- FIG. 22 is a flowchart showing an operation when the second offset calculator 7b in the fourth embodiment of the present invention calculates the second three-phase applied voltage.
- FIG. 23 is an explanatory diagram showing a second three-phase voltage command output by the voltage command calculator 6 and a second three-phase applied voltage output by the second offset calculator 7b in the fourth embodiment of the present invention. .
- the first offset calculator 7a executes step S120, and then proceeds to step S121.
- the first offset calculator 7a executes step S121, and if the difference between the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1 is equal to or greater than the reference voltage threshold Vth, executes the step S122, If the difference between the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1 is less than the reference voltage threshold Vth, step S413 is executed.
- step S413 all voltage commands of the first three-phase voltage command are set so that the voltage applied to the phase corresponding to the first maximum phase voltage command Vmax1 matches the maximum value of the first carrier wave signal C1. Values changed by the same amount are calculated as the first three-phase applied voltage.
- the applied voltage of the phase corresponding to the first maximum phase voltage command Vmax1 among the first three-phase applied voltages calculated by the execution of step S413 coincides with the maximum value of the first carrier wave signal.
- Step S413 is executed.
- the voltage Vv1 'applied to the V phase that is the phase corresponding to the first maximum phase voltage command Vmax1 matches the maximum value of the first carrier wave signal C1.
- the first offset calculator 7a determines the first three-phase voltage command so that the voltage applied to the phase corresponding to the first maximum phase voltage command Vmax1 is equal to the maximum value of the first carrier signal C1. Shift all voltage commands equally positive. In this case, the difference between each applied voltage of the first three-phase applied voltage and the reference voltage lower limit value Vlo becomes larger.
- each applied voltage of the first three-phase applied voltage can be set to a value equal to or higher than the reference voltage lower limit value Vlo.
- the amplitude range of the first three-phase voltage command is expanded.
- each applied voltage of the first three-phase applied voltage is lower than the reference voltage lower limit value Vlo. There is nothing. As a result, the switching signals Qup1 to Qwn1 are not switched in the current detection period, and the second current detector 9b can correctly detect the second three-phase current.
- step S ⁇ b> 130 The operation of calculating the second three-phase applied voltage by the second offset calculator 7b is as shown in FIG.
- this flowchart includes step S ⁇ b> 130, step S ⁇ b> 131, step S ⁇ b> 132 for executing the third calculation process, and step S ⁇ b> 423 similar to step S ⁇ b> 413 for executing the fourth calculation process.
- the second offset calculator 7b calculates the second three-phase applied voltage in the same manner as the first offset calculator 7a. Therefore, as shown in FIG. 23, the waveform of the second three-phase voltage command output from the voltage command calculator 6 and the waveform of the second three-phase applied voltage output from the second offset calculator 7b are as shown in FIG. It will be the same.
- the amplitude of the second three-phase voltage command is larger than in the first to third embodiments. Even when becomes larger, each applied voltage of the second three-phase applied voltage never falls below the reference voltage lower limit value Vlo. As a result, the switching signals Qup2 to Qwn2 are not switched during the current detection period, and the first current detector 9a can correctly detect the first three-phase current.
- the offset calculator in the second calculation process, is configured such that the voltage applied to the phase corresponding to the first minimum phase voltage command is greater than or equal to the reference voltage lower limit value and the first maximum phase.
- the first three-phase Calculate the applied voltage By changing all the voltage commands of the first three-phase voltage command by the same amount so that the voltage applied to the phase corresponding to the voltage command is less than or equal to the maximum value of the first carrier signal, the first three-phase Calculate the applied voltage.
- the offset calculator is applied to the phase corresponding to the second maximum phase voltage command when the voltage applied to the phase corresponding to the second minimum phase voltage command is greater than or equal to the reference voltage lower limit value.
- the second three-phase applied voltage is calculated by changing all the voltage commands of the second three-phase voltage command by the same amount so that the voltage of the second carrier signal is not more than the maximum value of the second carrier signal.
- the offset calculator calculates the first three-phase voltage command in the positive direction in which the voltage applied to the phase corresponding to the first maximum phase voltage command approaches the maximum value of the first carrier signal. Change all voltage commands by the same amount.
- the offset calculator calculates the second three-phase voltage command in the positive direction in which the voltage applied to the phase corresponding to the second maximum phase voltage command approaches the maximum value of the second carrier signal. Change all voltage commands by the same amount.
- the amplitudes of the first three-phase voltage command and the second three-phase voltage command can be set larger than in the first to third embodiments, so that the first current detector is the first current detector.
- the three-phase current can be detected more accurately, and the second current detector can detect the second three-phase current more accurately.
- Embodiment 5 FIG.
- the fifth embodiment of the present invention the case where the contents of the second calculation process and the fourth calculation process are different from those of the first to fourth embodiments will be described.
- description of points that are the same as in the first to fourth embodiments will be omitted, and differences from the first to fourth embodiments will be mainly described.
- the first offset calculator 7a is arranged so that the voltage applied to the phase corresponding to the first maximum phase voltage command Vmax1 approaches the reference voltage upper limit value Vhi.
- the first three-phase applied voltage is calculated by changing all the voltage commands of the first three-phase voltage command by the same amount.
- the second offset calculator 7b sets the second three-phase voltage command so that the voltage applied to the phase corresponding to the second maximum phase voltage command Vmax2 approaches the reference voltage upper limit value Vhi.
- the second three-phase applied voltage is calculated by changing all voltage commands by the same amount.
- the first offset calculator 7a uses the first three-phase voltage command so that the voltage applied to the phase corresponding to the first maximum phase voltage command Vmax1 matches the reference voltage upper limit value Vhi. The case where all the voltage commands are changed by the same amount is illustrated. Further, the second offset calculator 7b outputs all the voltage commands of the second three-phase voltage command so that the voltage applied to the phase corresponding to the second maximum phase voltage command Vmax2 matches the reference voltage upper limit value Vhi. A case where the same amount is changed is illustrated.
- the reference voltage upper limit value Vhi is defined by the following equation using the reference voltage threshold value Vth and the maximum value of the first carrier signal C1.
- Reference voltage upper limit value Vhi (Maximum value of the first carrier signal C1) -Reference voltage threshold Vth
- the maximum value of the first carrier wave signal C1 is assumed to be 0.5 Vdc, and in this case, the reference voltage upper limit value Vhi is expressed by “0.5 Vdc ⁇ Vth”.
- FIG. 24 is a flowchart showing an operation when the first offset calculator 7a in the fifth embodiment of the present invention calculates the first three-phase applied voltage.
- FIG. 25 is an explanatory diagram showing a first three-phase voltage command output by the voltage command calculator 6 and a first three-phase applied voltage output by the first offset calculator 7a in Embodiment 5 of the present invention.
- FIG. 26 is a flowchart showing an operation when the second offset calculator 7b in the fifth embodiment of the present invention calculates the second three-phase applied voltage.
- FIG. 27 is an explanatory diagram showing a second three-phase voltage command output by the voltage command calculator 6 and a second three-phase applied voltage output by the second offset calculator 7b in the fifth embodiment of the present invention. .
- the first offset calculator 7a proceeds to step S121 after executing step S120.
- the first offset calculator 7a executes step S121, and if the difference between the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1 is equal to or greater than the reference voltage threshold Vth, executes the step S122, If the difference between the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1 is less than the reference voltage threshold Vth, step S513 is executed.
- step S513 all voltage commands of the first three-phase voltage command are set to the same amount so that the voltage applied to the phase corresponding to the first maximum phase voltage command Vmax1 matches the reference voltage upper limit value Vhi. The value changed only by this is calculated as the first three-phase applied voltage.
- the applied voltage of the phase corresponding to the first maximum phase voltage command Vmax1 among the first three-phase applied voltages calculated by the execution of step S513 coincides with the reference voltage upper limit value Vhi.
- Step S513 is executed.
- the voltage Vv1 'applied to the V phase that is the phase corresponding to the first maximum phase voltage command Vmax1 matches the reference voltage upper limit value Vhi.
- the first offset calculator 7a determines that all voltages of the first three-phase voltage command are such that the voltage applied to the phase corresponding to the first maximum phase voltage command Vmax1 is equal to the reference voltage upper limit value Vhi. Shift the command equally positive. In this case, the difference between each applied voltage of the first three-phase applied voltage and the reference voltage lower limit value Vlo becomes larger.
- each of the first three-phase applied voltages is different even when the amplitude of the first three-phase voltage command is larger than in the first to third embodiments.
- the applied voltage never falls below the reference voltage lower limit value Vlo.
- the switching signals Qup1 to Qwn1 are not switched in the current detection period, and the second current detector 9b can correctly detect the second three-phase current.
- FIG. 26 The operation of calculating the second three-phase applied voltage by the second offset calculator 7b is as shown in FIG. As can be seen from FIG. 26, this flowchart is composed of step S130, step S131, step S132 for executing the third calculation process, and step S523 similar to step S513 for executing the fourth calculation process.
- the second offset calculator 7b calculates the second three-phase applied voltage in the same manner as the first offset calculator 7a. Therefore, as shown in FIG. 27, the waveform of the second three-phase voltage command output from the voltage command calculator 6 and the waveform of the second three-phase applied voltage output from the second offset calculator 7b are as shown in FIG. It will be the same.
- the amplitude of the second three-phase voltage command is larger than in the first to third embodiments. Even when becomes larger, each applied voltage of the second three-phase applied voltage never falls below the reference voltage lower limit value Vlo. As a result, the switching signals Qup2 to Qwn2 are not switched during the current detection period, and the first current detector 9a can correctly detect the first three-phase current.
- the offset calculator determines that the voltage applied to the phase corresponding to the first maximum phase voltage command is the maximum value of the first carrier signal and the reference voltage threshold value. All the voltage commands of the first three-phase voltage command are changed by the same amount in the positive direction approaching the reference voltage upper limit value that is the difference between the first and third phase voltage commands.
- the offset calculator calculates all the second three-phase voltage commands in the positive direction in which the voltage applied to the phase corresponding to the second maximum phase voltage command approaches the reference voltage upper limit value. Change the voltage command by the same amount. Thereby, the same effect as in the fourth embodiment can be obtained.
- the first offset calculation is performed.
- the combination of the arithmetic processes executed by the calculator 7a and the second offset calculator 7b a combination of the first arithmetic process and the third arithmetic process and a combination of the second arithmetic process and the fourth arithmetic process mainly occur.
- the ripple current of the smoothing capacitor 3 can be further reduced by combining the contents disclosed in the first to fifth embodiments.
- the contents disclosed in the first to fifth embodiments are two examples.
- Example 1 As described above, when the first arithmetic processing is executed, the first three-phase voltage command indicates that the applied voltage of the phase corresponding to the first minimum phase voltage command among the first three-phase applied voltages is the first carrier wave. Shift equally in the negative direction to match the minimum value of signal C1.
- the fourth arithmetic processing when the arithmetic processing is to be executed by a combination of the first arithmetic processing and the fourth arithmetic processing, in the fourth arithmetic processing, the value obtained by equally shifting the second three-phase voltage command in the negative direction is Calculated as phase applied voltage. That is, when the first offset computing unit 7a and the second offset computing unit 7b intend to execute the computing process by a combination of the first computing process and the fourth computing process, the second offset computing unit 7b Then, all the voltage commands of the second three-phase voltage command are changed by the same amount in the negative direction in which the voltage applied to the phase corresponding to the second minimum phase voltage command Vmin2 approaches the reference voltage lower limit value Vlo.
- Example 2 As described above, when the third calculation process is executed, the second three-phase voltage command indicates that the applied voltage of the phase corresponding to the second minimum phase voltage command among the second three-phase applied voltages is the second carrier wave. Shift equally in the negative direction to match the minimum value of signal C2.
- the value obtained by equally shifting the first three-phase voltage command in the negative direction is the first three-phase applied voltage. Is calculated as That is, when the first offset computing unit 7a and the second offset computing unit 7b intend to perform the computing process by a combination of the second computing process and the third computing process, the first offset computing unit 7a Then, all the voltage commands of the first three-phase voltage command are changed by the same amount in the negative direction in which the voltage applied to the phase corresponding to the first minimum phase voltage command Vmin1 approaches the reference voltage lower limit value Vlo.
- Embodiment 6 FIG.
- the first offset calculator 7a and the second offset calculator 7b perform the fifth calculation process instead of the first to fourth calculation processes when a specific condition is satisfied.
- a case will be described in which the first three-phase applied voltage and the second three-phase applied voltage are calculated by execution.
- description of points that are the same as in the first to fifth embodiments will be omitted, and differences from the first to fifth embodiments will be mainly described.
- the first offset calculator 7a is an average value of the applied voltages of the first three-phase applied voltages as the fifth calculation process when a specific condition is satisfied.
- the first three-phase applied voltage is calculated from the first three-phase voltage command so that the one average voltage Vave1 becomes zero.
- the second offset calculator 7a sets the second average voltage Vave2 that is the average value of the applied voltages of the second three-phase applied voltage to 0 as the fifth calculation process.
- the second three-phase applied voltage is calculated from the second three-phase voltage command.
- the first average voltage Vave1 matches the average value of each voltage applied from the power converter 4a to the first three-phase winding
- the second average voltage Vave2 is transferred from the power converter 4b to the second three-phase winding. It corresponds to the average value of each applied voltage.
- the specific condition for the first offset calculator 7a and the second offset calculator 7b to execute the fifth calculation process is when the following condition (1), condition (2), or condition (3) is satisfied. .
- ⁇ Condition (1) The rotational speed ⁇ of the AC rotating machine 1 is equal to or lower than the rotational speed threshold value ⁇ x.
- ⁇ Condition (2) The current command Iref to the AC rotating machine 1 is equal to or less than the current command threshold value Ix.
- the amplitude Vamp of the first three-phase voltage command is equal to or less than the amplitude threshold value Vx.
- FIG. 28 is a flowchart showing an operation when the first offset calculator 7a according to the sixth embodiment of the present invention calculates the first three-phase applied voltage.
- FIG. 29 is a flowchart showing an operation when the second offset calculator 7b in the sixth embodiment of the present invention calculates the second three-phase applied voltage.
- the first offset calculator 7a determines whether or not the condition (3) is satisfied. That is, the first offset calculator 7a determines whether or not the amplitude Vamp of the first three-phase voltage command is equal to or smaller than the amplitude threshold value Vx.
- the first offset calculator 7a determines that the amplitude Vamp is equal to or less than the amplitude threshold value Vx (ie, YES)
- the first offset calculator 7a proceeds to step S612, and determines that the amplitude Vamp is greater than the amplitude threshold value Vx (ie, NO). If so, the process proceeds to step S120.
- step S612 the first offset calculator 7a directly uses each voltage command of the first three-phase voltage command as the first three-phase applied voltage.
- step S120 the first offset calculator 7a performs the same operations as those in the first to fifth embodiments.
- FIG. 28 illustrates the case where the first offset calculator 7a performs the same operation as in the third embodiment (see FIG. 16).
- step S611 and step S612 The operation of calculating the second three-phase applied voltage by the second offset calculator 7b is as shown in FIG. As can be seen from FIG. 29, this flowchart is similar to step S611 and step S612, and includes step S622, step S130, step S131, step S132, and step S323 for executing the fifth arithmetic processing. Is done. That is, the second offset calculator 7b calculates the second three-phase applied voltage in the same manner as the first offset calculator 7a.
- the fifth calculation process when the fifth calculation process is executed when the specific condition is satisfied, the advantage that the vibration of the AC rotating machine 1 can be most suppressed, the increase in the ripple current of the smoothing capacitor 3, or the voltage amplitude It can be considered a disadvantage that it cannot be increased.
- the voltage amplitude specifically, when the first calculation process is executed, when the fifth calculation process is executed, the maximum voltage utilization rate is 86.6%.
- the fifth calculation is performed when the current command Iref is equal to or less than the current command threshold Ix.
- the amplitude Vamp becomes equal to or less than the amplitude threshold Vx after setting the amplitude threshold Vx based on the voltage amplitude that the offset calculator 7 can output by executing the fifth calculation process. In this case, it is possible to suppress the vibration of the AC rotating machine 1 by executing the fifth calculation process.
- the rotational speed threshold ⁇ x is set based on the amplitude threshold Vx using the proportionality between the voltage amplitude and the rotational speed of the AC rotating machine 1, and then the rotational speed ⁇ becomes the rotational speed.
- the fifth arithmetic process is executed, whereby the vibration of the AC rotating machine 1 can be suppressed.
- the offset calculator 7 it is necessary to configure the offset calculator 7 so that the rotational speed ⁇ of the AC rotating machine 1 can be acquired.
- the offset calculator calculates the first three-phase voltage so that the first average voltage becomes 0 when the condition (1), (2), or (3) is satisfied.
- the fifth calculation process for calculating the second three-phase applied voltage from the second three-phase voltage command is performed so that the first three-phase applied voltage is calculated from the command and the second average voltage is 0. Executed instead of the fourth calculation process. As a result, the vibration of the AC rotating machine can be further suppressed as compared with the first to fifth embodiments.
- Embodiment 7 FIG.
- the first offset calculator 7a and the second offset calculator 7b are used when the condition (1), (2), or (3) described in the sixth embodiment is satisfied.
- the case where the first three-phase applied voltage and the second three-phase applied voltage are calculated by executing the sixth arithmetic process instead of the fifth arithmetic process will be described.
- description of points that are the same as in the first to sixth embodiments will be omitted, and differences from the previous first to sixth embodiments will be mainly described.
- the first offset calculator 7a performs the sixth calculation process from the first three-phase voltage command so that the first average voltage Vave1 becomes the first set voltage value less than 0.
- the first three-phase applied voltage is calculated.
- the second offset calculator 7b calculates the second three-phase applied voltage from the second three-phase voltage command so that the second average voltage Vave2 becomes the first set voltage value as the sixth calculation process.
- first offset computing unit 7a and the second offset computing unit 7b execute the sixth computation process when the condition (1), (2), or (3) is satisfied, thereby performing the first three-phase operation.
- the applied voltage and the second three-phase applied voltage are calculated.
- FIG. 30 is a flowchart showing an operation when the first offset calculator 7a in the seventh embodiment of the present invention calculates the first three-phase applied voltage.
- FIG. 31 is an explanatory diagram showing a first three-phase voltage command output from the voltage command calculator 6 and a first three-phase applied voltage output from the first offset calculator 7a according to Embodiment 7 of the present invention.
- FIG. 32 is a flowchart showing an operation when the second offset calculator 7b according to the seventh embodiment of the present invention calculates the second three-phase applied voltage.
- FIG. 33 is an explanatory diagram showing a second three-phase voltage command output by the voltage command calculator 6 and a second three-phase applied voltage output by the second offset calculator 7b in Embodiment 7 of the present invention. .
- the first offset calculator 7a executes step S611, and when the condition (3) is satisfied, the process proceeds to step S712, and the condition (3) is not satisfied.
- step S120 the process proceeds to step S120.
- it is configured to determine whether or not the condition (3) is satisfied in step S611. However, as described above, the condition (1) or the condition (2) is satisfied. You may comprise so that it may determine whether it exists.
- the first offset calculator 7a calculates, as the first three-phase applied voltage, a value obtained by subtracting the offset voltage Vh from each voltage command of the first three-phase voltage command.
- the offset voltage Vh is a value larger than 0 and may be set in advance.
- the offset voltage Vh is assumed to be 0.1 Vdc.
- the first offset calculator 7a performs the same operations as those in the first to fifth embodiments.
- FIG. 30 illustrates a case where the first offset calculator 7a performs the same operation as in the third embodiment (see FIG. 16).
- FIG. 31 illustrates the case where the first average voltage Vave1 is ⁇ 0.1 Vdc.
- step S611 and step S712 The operation of calculating the second three-phase applied voltage by the second offset calculator 7b is as shown in FIG. As can be seen from FIG. 32, this flowchart is similar to step S611 and step S712, and includes step S722, step S130, step S131, step S132, and step S323 for executing the sixth arithmetic processing. Is done. That is, the second offset calculator 7b calculates the second three-phase applied voltage in the same manner as the first offset calculator 7a.
- FIG. 33 illustrates the case where the second average voltage Vave2 is ⁇ 0.1 Vdc.
- FIG. 34 is an explanatory diagram for explaining the relationship among the first switching signal, the first voltage vector, and the first bus current Iinv1 in the seventh embodiment of the present invention.
- the first bus current Iinv1 when the first voltage vector is V0 (1) and V7 (1) according to the values of the switching signals Qup1 to Qwn1, the first bus current Iinv1 is 0.
- voltage vectors such as V0 (1) and V7 (1) at which the first bus current Iinv1 is 0 are referred to as “zero vectors”.
- the first voltage vector is a zero vector, the first bus current Iinv1 is zero.
- the first bus current Iinv1 is equal to or equal to one of the currents of the first three-phase currents. It is a value obtained by inverting the sign of. In this case, the first bus current Iinv1 does not become zero unless the one current is zero.
- FIG. 35 is an explanatory diagram for explaining a relationship among the second switching signal, the second voltage vector, and the second bus current Iinv2 in the seventh embodiment of the present invention.
- the second bus current Iinv2 is equal to or equal to one of the currents of the second three-phase currents. It is a value obtained by inverting the sign of. In this case, the second bus current Iinv2 does not become zero unless the one current is zero.
- the first carrier signal C1, the second carrier signal C2, the first three-phase applied voltage, the second three-phase applied voltage, the first bus current Iinv1, the second bus current Iinv2, and the first bus The relationship with the bus current sum Iinv_sum, which is the sum of the current Iinv1 and the second bus current Iinv2, will be described with reference to FIGS.
- FIG. 36 shows the first carrier wave signal C1, the second carrier wave signal C2, the first three-phase applied voltage, the second three-phase applied voltage, and the first bus current Iinv1, according to the seventh embodiment of the present invention. It is explanatory drawing which shows the relationship between 2nd bus-line current Iinv2 and bus-current sum Iinv_sum.
- FIG. 37 is an explanatory diagram for comparison with FIG.
- FIG. 37 as a comparative example corresponding to the sixth embodiment, the relationship between parameters at the moment indicated by [3] when the offset voltage Vh is set to 0 is illustrated. In this case, the first average voltage Vave1 and the second average voltage Vave2 are zero.
- the combination of the type of the first voltage vector output from the first power converter 4a and the type of the second voltage vector output from the second power converter 4b is distinguished.
- the following modes ⁇ 1> to ⁇ 4> are defined.
- the first three-phase voltage command and the second three-phase voltage command are equal to the first three-phase applied voltage and the second three-phase applied voltage, respectively. Therefore, as shown in FIG. 37, the ⁇ 1> mode in which the bus current sum Iinv_sum is 0 and the ⁇ 4> mode in which the bus current sum Iinv_sum is Iv1 + Iv2 are repeated.
- the sixth arithmetic process is executed, so that the values obtained by subtracting the offset voltage Vh from the first three-phase voltage command and the second three-phase voltage command are The first three-phase applied voltage and the second three-phase applied voltage.
- the period during which the first power converter 4a outputs an effective vector is a period from time t1 to time t2 as compared to the period during which the second power converter 4b outputs an effective vector.
- the shift is made to time t3.
- FIG. 38 is an explanatory diagram showing the relationship among the DC current Ib that is the output current of the DC power supply 2, the ripple current Ic that is the output current of the smoothing capacitor 3, and the bus current sum Iinv_sum in the seventh embodiment of the present invention. It is.
- FIG. 39 is an explanatory diagram for comparison with FIG.
- FIG. 38 shows the bus current sum Iinv_sum shown in FIG. 36
- FIG. 39 shows the bus current sum Iinv_sum shown in FIG.
- the period of ⁇ 4> mode disappears along with the period of ⁇ 2> mode and ⁇ 3> mode, and the period of ⁇ 1> mode also disappears. It is also reduced. As a result, the ripple current of the smoothing capacitor 3 can be reduced in the seventh embodiment as compared to the previous sixth embodiment.
- the offset calculator when the condition (1), (2), or (3) is satisfied, the offset calculator is configured so that the first average voltage becomes the first set voltage value less than 0.
- the first three-phase applied voltage is calculated from the first three-phase voltage command
- the second three-phase applied voltage is calculated from the second three-phase voltage command so that the second average voltage becomes the first set voltage value.
- a sixth calculation process for calculation is executed instead of the first to fourth calculation processes.
- one of the first power converter and the second power converter is an effective vector, and the other is Since the zero vector can be output, the ripple current of the smoothing capacitor can be reduced.
- the offset voltage Vh is a value larger than 0 is exemplified, but the same effect can be obtained even if the offset voltage Vh is a value less than 0.
- the offset calculator 7 calculates the first three-phase applied voltage from the first three-phase voltage command so that the first average voltage becomes a second set voltage value larger than 0, and the second Instead of the first to fourth calculation processes, a seventh calculation process for calculating the second three-phase applied voltage from the second three-phase voltage command is performed so that the average voltage becomes the second set voltage value.
- the offset calculator 7 is configured to execute either one of the sixth calculation process and the seventh calculation process when the condition (1), (2), or (3) is satisfied. May be.
- FIG. 40 shows the first three-phase application output from the offset calculator 7 when the offset calculator 7 executes the sixth calculation process and the seventh calculation process while alternately switching in the seventh embodiment of the present invention. It is explanatory drawing which shows a voltage and a 2nd three-phase applied voltage.
- the offset voltage Vh corresponding to the sixth calculation process is set to be 0.2 Vdc
- the offset voltage Vh corresponding to the seventh calculation process is set to be ⁇ 0.2 Vdc. This is an example.
- the sixth calculation process is switched to the seventh calculation process, and the selection of the seventh calculation process is continued in the period T2. Thereafter, the seventh calculation process is switched to the sixth calculation process.
- each of the first offset calculator 7a and the second offset calculator 7b selects the sixth calculation process and the seventh calculation process alternately at a preset timing.
- the period T1 and the period T2 are preferably set to the same value, and in this case, the sixth calculation process and the seventh calculation process are switched at regular intervals.
- the first power converter 4a and the second power converter 4b have a high potential.
- the energization time of the side switching element is shorter than the energization time of the low potential side switching element, and the heat generation cannot be balanced.
- the high-potential side switching is performed in the first power converter 4a and the second power converter 4b.
- the energization time of the element is longer than the energization time of the low potential side switching element, and the heat generation cannot be balanced.
- the first calculation process and the second calculation process are switched according to the difference between the first intermediate phase voltage command Vmid1 and the first minimum phase voltage command Vmin1, and The case where the third calculation process and the fourth calculation process are switched according to the difference between the two intermediate phase voltage command Vmid2 and the second minimum phase voltage command Vmin2 is illustrated.
- the first calculation process and the second calculation process are switched according to the voltage phase input from the voltage phase calculator 10.
- the third calculation process and the fourth calculation process may be switched.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
Description
図1は、本発明の実施の形態1における電力変換装置の全体を示す構成図である。なお、図1には、本実施の形態1における電力変換装置に接続された、交流回転機1および直流電源2も併せて図示している。
基準電圧下限値Vlo
=基準電圧閾値Vth
+(第1搬送波信号C1の最小値)
Vth=ti/Tc×Vdc
先の実施の形態1では、第1中間相電圧指令Vmid1と第1最小相電圧指令Vmin1との差に応じて第1演算処理と第2演算処理とが切り替えられるとともに、第2中間相電圧指令Vmid2と第2最小相電圧指令Vmin2との差に応じて第3演算処理と第4演算処理とが切り替えられるように構成する場合について説明した。これに対して、本発明の実施の形態2では、電圧位相θvに応じて第1演算処理と第2演算処理とが切り替えられるとともに、第3演算処理と第4演算処理とが切り替えられるように構成する場合について説明する。
本発明の実施の形態3では、第2演算処理および第4演算処理の内容が、先の実施の形態1、2とは異なる場合について説明する。なお、本実施の形態3では、先の実施の形態1、2と同様である点の説明を省略し、先の実施の形態1、2と異なる点を中心に説明する。
本発明の実施の形態4では、第2演算処理および第4演算処理の内容が、先の実施の形態1~3とは異なる場合について説明する。なお、本実施の形態4では、先の実施の形態1~3と同様である点の説明を省略し、先の実施の形態1~3と異なる点を中心に説明する。
本発明の実施の形態5では、第2演算処理および第4演算処理の内容が、先の実施の形態1~4とは異なる場合について説明する。なお、本実施の形態5では、先の実施の形態1~4と同様である点の説明を省略し、先の実施の形態1~4と異なる点を中心に説明する。
基準電圧上限値Vhi
=(第1搬送波信号C1の最大値)
-基準電圧閾値Vth
前述したように、第1演算処理が実行されることで、第1三相電圧指令は、第1三相印加電圧のうち、第1最小相電圧指令に対応する相の印加電圧が第1搬送波信号C1の最小値と一致するように、負の方向に等しくシフトする。
前述したように、第3演算処理が実行されることで、第2三相電圧指令は、第2三相印加電圧のうち、第2最小相電圧指令に対応する相の印加電圧が第2搬送波信号C2の最小値と一致するように、負の方向に等しくシフトする。
本発明の実施の形態6では、第1オフセット演算器7aおよび第2オフセット演算器7bは、特定の条件が成立した場合には、第1~第4演算処理の代わりに、第5演算処理を実行することで、第1三相印加電圧および第2三相印加電圧を演算する場合について説明する。なお、本実施の形態6では、先の実施の形態1~5と同様である点の説明を省略し、先の実施の形態1~5と異なる点を中心に説明する。
・条件(1)
交流回転機1の回転速度ωが回転速度閾値ωx以下である。
・条件(2)
交流回転機1への電流指令Irefが電流指令閾値Ix以下である。
・条件(3)
第1三相電圧指令の振幅Vampが振幅閾値Vx以下である。
本発明の実施の形態7では、第1オフセット演算器7aおよび第2オフセット演算器7bは、先の実施の形態6で説明した条件(1)、(2)または(3)が成立した場合に、第5演算処理の代わりに、第6演算処理を実行することで、第1三相印加電圧および第2三相印加電圧を演算する場合について説明する。なお、本実施の形態7では、先の実施の形態1~6と同様である点の説明を省略し、先の実施の形態1~6と異なる点を中心に説明する。
<1>:
第1電力変換器4aおよび第2電力変換器4bがともに零ベクトルを出力する。
<2>:
第1電力変換器4aが有効ベクトルを出力し、第2電力変換器4bが零ベクトルを出力する。
<3>:
第1電力変換器4aが零ベクトルを出力し、第2電力変換器4bが有効ベクトルを出力する。
<4>:
第1電力変換器4aおよび第2電力変換器4bがともに有効ベクトルを出力する。
Iinv_sum=Iinv1+Iinv2=Ib+Ic
Ic=Iinv1+Iinv2-Idc
Claims (14)
- 直流電圧を出力する直流電源と、第1三相巻線および第2三相巻線を有する交流回転機とに接続された電力変換装置であって、
第1高電位側スイッチング素子および第1低電位側スイッチング素子を有し、前記直流電源から供給される前記直流電圧を第1交流電圧に変換し、前記第1交流電圧を前記第1三相巻線に印加する第1電力変換器と、
第2高電位側スイッチング素子および第2低電位側スイッチング素子を有し、前記直流電源から供給される前記直流電圧を第2交流電圧に変換し、前記第2交流電圧を前記第2三相巻線に印加する第2電力変換器と、
前記第1高電位側スイッチング素子および前記第1低電位側スイッチング素子と、第2高電位側スイッチング素子および第2低電位側スイッチング素子とをそれぞれ制御する制御部と、
前記第1三相巻線に流れる第1三相電流を検出する第1電流検出器と、
前記第2三相巻線に流れる第2三相電流を検出する第2電流検出器と、
を備え、
前記制御部は、
前記交流回転機への制御指令に基づいて、前記第1三相巻線への第1三相電圧指令と、前記第2三相巻線への第2三相電圧指令を演算し、演算した前記第1三相電圧指令および前記第2三相電圧指令を出力する電圧指令演算器と、
前記電圧指令演算器から入力された前記第1三相電圧指令から、前記第1三相巻線に印加する第1三相印加電圧を演算し、演算した前記第1三相印加電圧を出力するとともに、前記電圧指令演算器から入力された前記第2三相電圧指令から、前記第2三相巻線に印加する第2三相印加電圧を演算し、演算した前記第2三相印加電圧を出力するオフセット演算器と、
前記オフセット演算器から入力された前記第1三相印加電圧と、第1搬送波信号とを比較することで、前記第1高電位側スイッチング素子および前記第1低電位側スイッチング素子に第1スイッチング信号を出力するとともに、前記オフセット演算器から入力された前記第2三相印加電圧と、前記第1搬送波信号と180°の位相差を有する第2搬送波信号とを比較することで、前記第2高電位側スイッチング素子および前記第2低電位側スイッチング素子に第2スイッチング信号を出力するスイッチング信号発生器と、
を有し、
前記電圧指令演算器から入力された前記第1三相電圧指令の各電圧指令を大きい順に第1最大相電圧指令、第1中間相電圧指令、第1最小相電圧指令とし、前記電圧指令演算器から入力された前記第2三相電圧指令のそれぞれを大きい順に第2最大相電圧指令、第2中間相電圧指令、第2最小相電圧指令としたとき、
前記オフセット演算器は、
前記第1中間相電圧指令と前記第1最小相電圧指令との差である第1差分値に応じて、
前記第1差分値があらかじめ設定された基準電圧閾値以上の場合には、前記第1最小相電圧指令に対応する相に印加される電圧が、前記第1搬送波信号の最小値と等しくなるように、前記第1三相電圧指令のすべての電圧指令を互いに同じ量だけ変化させることで、第1三相印加電圧を演算する第1演算処理を実行し、
前記第1差分値が前記基準電圧閾値未満の場合には、前記第1最小相電圧指令に対応する相に印加される電圧が、前記基準電圧閾値と前記第1搬送波信号の最小値との和である基準電圧下限値以上となるように、前記第1三相電圧指令から、前記第1三相印加電圧を演算する第2演算処理を実行し、
前記第2中間相電圧指令と前記第2最小相電圧指令との差である第2差分値に応じて、
前記第2差分値が前記基準電圧閾値以上の場合には、前記第2最小相電圧指令に対応する相に印加される電圧が前記第2搬送波信号の最小値と等しくなるように、前記第2三相電圧指令のすべての電圧指令を互いに同じ量だけ変化させることで、第2三相印加電圧を演算する第3演算処理を実行し、
前記第2差分値が前記基準電圧閾値未満の場合には、前記第2最小相電圧指令に対応する相に印加される電圧が、前記基準電圧下限値以上となるように、前記第2三相電圧指令から、前記第2三相印加電圧を演算する第4演算処理を実行する
電力変換装置。 - 前記オフセット演算器は、
前記第2演算処理では、前記第1三相電圧指令のすべての電圧指令を前記第1三相印加電圧とすることで、前記第1三相印加電圧を演算し、
前記第4演算処理では、前記第2三相電圧指令のすべての電圧指令を前記第2三相印加電圧とすることで、前記第2三相印加電圧を演算する
請求項1に記載の電力変換装置。 - 前記オフセット演算器は、
前記第2演算処理では、前記第1最小相電圧指令に対応する相に印加される電圧が前記基準電圧下限値以上となるように、前記第1三相電圧指令のすべての電圧指令を互いに同じ量だけ変化させることで、第1三相印加電圧を演算し、
前記第4演算処理では、前記第2最小相電圧指令に対応する相に印加される電圧が前記基準電圧下限値以上となるように、前記第2三相電圧指令のすべての電圧指令を互いに同じ量だけ変化させることで、第2三相印加電圧を演算する
請求項1に記載の電力変換装置。 - 前記オフセット演算器は、
前記第2演算処理では、前記第1最小相電圧指令に対応する相に印加される電圧が前記基準電圧下限値に近づく負の方向に、前記第1三相電圧指令のすべての電圧指令を互いに同じ量だけ変化させ、
前記第4演算処理では、前記第2最小相電圧指令に対応する相に印加される電圧が前記基準電圧下限値に近づく負の方向に、前記第2三相電圧指令のすべての電圧指令を互いに同じ量だけ変化させる
請求項3に記載の電力変換装置。 - 前記オフセット演算器は、
前記第1演算処理および前記第4演算処理の組み合わせで演算処理を実行しようとする場合、前記第4演算処理では、前記負の方向に、前記第2三相電圧指令のすべての電圧指令を互いに同じ量だけ変化させ、
前記第2演算処理および前記第3演算処理の組み合わせで演算処理を実行しようとする場合、前記第2演算処理では、前記負の方向に、前記第1三相電圧指令のすべての電圧指令を互いに同じ量だけ変化させる
請求項4に記載の電力変換装置。 - 前記オフセット演算器は、
前記第2演算処理では、前記第1最小相電圧指令に対応する相に印加される電圧が前記基準電圧下限値以上となり、かつ前記第1最大相電圧指令に対応する相に印加される電圧が前記第1搬送波信号の最大値以下となるように、前記第1三相電圧指令のすべての電圧指令を互いに同じ量だけ変化させることで、第1三相印加電圧を演算し、
前記第4演算処理では、前記第2最小相電圧指令に対応する相に印加される電圧が前記基準電圧下限値以上となり、かつ前記第2最大相電圧指令に対応する相に印加される電圧が前記第2搬送波信号の最大値以下となるように、前記第2三相電圧指令のすべての電圧指令を互いに同じ量だけ変化させることで、第2三相印加電圧を演算する
請求項3に記載の電力変換装置。 - 前記オフセット演算器は、
前記第2演算処理では、前記第1最大相電圧指令に対応する相に印加される電圧が前記第1搬送波信号の最大値に近づく正の方向に、前記第1三相電圧指令のすべての電圧指令を互いに同じ量だけ変化させ、
前記第4演算処理では、前記第2最大相電圧指令に対応する相に印加される電圧が前記第2搬送波信号の最大値に近づく正の方向に、前記第2三相電圧指令のすべての電圧指令を互いに同じ量だけ変化させる
請求項6に記載の電力変換装置。 - 前記オフセット演算器は、
前記第2演算処理では、前記第1最大相電圧指令に対応する相に印加される電圧が、前記第1搬送波信号の最大値と前記基準電圧閾値との差である基準電圧上限値に近づく正の方向に、前記第1三相電圧指令のすべての電圧指令を互いに同じ量だけ変化させ、
前記第4演算処理では、前記第2最大相電圧指令に対応する相に印加される電圧が、前記基準電圧上限値に近づく正の方向に、前記第2三相電圧指令のすべての電圧指令を互いに同じ量だけ変化させる
請求項6に記載の電力変換装置。 - 前記制御部は、
前記第1三相電圧指令および前記第2三相電圧指令の少なくとも一方から電圧位相を演算し、演算した前記電圧位相を出力する電圧位相演算器をさらに有し、
前記オフセット演算器は、
前記第1中間相電圧指令と前記第1最小相電圧指令との差の代わりに、前記電圧位相演算器から入力された前記電圧位相に応じて、前記電圧位相があらかじめ設定した特定の範囲内にあるか否かで前記第1演算処理および前記第2演算処理のいずれか一方の演算処理を実行し、
前記第2中間相電圧指令と前記第2最小相電圧指令との差の代わりに、前記電圧位相演算器から入力された前記電圧位相に応じて、前記電圧位相が前記特定の範囲内にあるか否かで前記第3演算処理および前記第4演算処理のいずれか一方の演算処理を実行する
請求項1から8のいずれか1項に記載の電力変換装置。 - 前記オフセット演算器は、
前記交流回転機の回転速度が回転速度閾値以下である場合、前記交流回転機への電流指令が電流指令閾値以下である場合、または前記第1三相電圧指令の振幅が振幅閾値以下である場合に、
前記第1三相印加電圧の各印加電圧の平均値である第1平均電圧が0になるように、前記第1三相電圧指令から、前記第1三相印加電圧を演算するとともに、前記第2三相印加電圧の各印加電圧の平均値である第2平均電圧が0になるように、前記第2三相電圧指令から、前記第2三相印加電圧を演算する第5演算処理を、前記第1演算処理、前記第2演算処理、前記第3演算処理および前記第4演算処理の代わりに実行する
請求項1から9のいずれか1項に記載の電力変換装置。 - 前記オフセット演算器は、
前記交流回転機の回転速度が回転速度閾値以下である場合、前記交流回転機への電流指令が電流指令閾値以下である場合、または前記第1三相電圧指令の振幅が振幅閾値以下である場合に、
前記第1三相印加電圧の各印加電圧の平均値である第1平均電圧が、0未満の第1設定電圧値になるように、前記第1三相電圧指令から、前記第1三相印加電圧を演算するとともに、前記第2三相印加電圧の各印加電圧の平均値である第2平均電圧が、前記第1設定電圧値になるように、前記第2三相電圧指令から、前記第2三相印加電圧を演算する第6演算処理を、前記第1演算処理、前記第2演算処理、前記第3演算処理および前記第4演算処理の代わりに実行する
請求項1から9のいずれか1項に記載の電力変換装置。 - 前記オフセット演算器は、
前記交流回転機の回転速度が回転速度閾値以下である場合、前記交流回転機への電流指令が電流指令閾値以下である場合、または前記第1三相電圧指令の振幅が振幅閾値以下である場合に、
前記第1三相印加電圧の各印加電圧の平均値である第1平均電圧が、0よりも大きい第2設定電圧値になるように、前記第1三相電圧指令から、前記第1三相印加電圧を演算するとともに、前記第2三相印加電圧の各印加電圧の平均値である第2平均電圧が、前記第2設定電圧値となるように、前記第2三相電圧指令から、前記第2三相印加電圧を演算する第7演算処理を、前記第1演算処理、前記第2演算処理、前記第3演算処理および前記第4演算処理の代わりに実行する
請求項1から9のいずれか1項に記載の電力変換装置。 - 前記オフセット演算器は、
前記交流回転機の回転速度が回転速度閾値以下である場合、前記交流回転機への電流指令が電流指令閾値以下である場合、または前記第1三相電圧指令の振幅が振幅閾値以下である場合に、
前記第1三相印加電圧の各印加電圧の平均値である第1平均電圧が、0未満の第1設定電圧値になるように、前記第1三相電圧指令から、前記第1三相印加電圧を演算するとともに、前記第2三相印加電圧の各印加電圧の平均値である第2平均電圧が、前記第1設定電圧値になるように、前記第2三相電圧指令から、前記第2三相印加電圧を演算する第6演算処理と、
前記第1三相印加電圧の各印加電圧の平均値である第1平均電圧が、0よりも大きい第2設定電圧値になるように、前記第1三相電圧指令から、前記第1三相印加電圧を演算するとともに、前記第2三相印加電圧の各印加電圧の平均値である第2平均電圧が、前記第2設定電圧値となるように、前記第2三相電圧指令から、前記第2三相印加電圧を演算する第7演算処理とを、
交互に切り替えながらいずれか一方を、前記第1演算処理、前記第2演算処理、前記第3演算処理および前記第4演算処理の代わりに実行する
請求項1から9のいずれか1項に記載の電力変換装置。 - 前記基準電圧閾値は、
第1電流検出器および第2電流検出器のそれぞれが電流を検出するのに要する通電時間から決定される
請求項1から13のいずれか1項に記載の電力変換装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15882532.3A EP3261247B1 (en) | 2015-02-16 | 2015-02-16 | Power conversion device |
CN201580075775.8A CN107210702B (zh) | 2015-02-16 | 2015-02-16 | 功率转换装置 |
JP2017500492A JP6250222B2 (ja) | 2015-02-16 | 2015-02-16 | 電力変換装置 |
PCT/JP2015/054112 WO2016132427A1 (ja) | 2015-02-16 | 2015-02-16 | 電力変換装置 |
US15/544,351 US10374503B2 (en) | 2015-02-16 | 2015-02-16 | Power conversion device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2015/054112 WO2016132427A1 (ja) | 2015-02-16 | 2015-02-16 | 電力変換装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016132427A1 true WO2016132427A1 (ja) | 2016-08-25 |
Family
ID=56688727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2015/054112 WO2016132427A1 (ja) | 2015-02-16 | 2015-02-16 | 電力変換装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US10374503B2 (ja) |
EP (1) | EP3261247B1 (ja) |
JP (1) | JP6250222B2 (ja) |
CN (1) | CN107210702B (ja) |
WO (1) | WO2016132427A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3651351A4 (en) * | 2017-07-03 | 2020-06-24 | Mitsubishi Electric Corporation | POWER CONVERSION DEVICE AND ELECTRIC POWER STEERING DEVICE |
WO2022130480A1 (ja) * | 2020-12-15 | 2022-06-23 | 三菱電機株式会社 | 電力変換装置 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016107614A1 (de) * | 2016-04-25 | 2017-10-26 | Wobben Properties Gmbh | Wechselrichter und Verfahren zum Erzeugen eines Wechselstroms |
US10998834B2 (en) * | 2017-08-21 | 2021-05-04 | Mitsubishi Electric Corporation | Power conversion device and electric power steering device |
DE102018211110A1 (de) * | 2017-12-14 | 2019-06-19 | Continental Automotive Gmbh | Elektrische Antriebsanordnung, insb. zum Betrieb eines Hybridelektro-/Elektrofahrzeugs |
JP7096679B2 (ja) * | 2018-03-16 | 2022-07-06 | 日立Astemo株式会社 | モータ制御装置 |
FR3080722A1 (fr) * | 2018-04-26 | 2019-11-01 | Valeo Equipements Electriques Moteur | Dispositif et procede de commande d'un onduleur d'une machine electrique comportant deux systemes polyphases, programme d'ordinateur correspondant |
CN112840551B (zh) * | 2018-11-01 | 2023-11-17 | 株式会社安川电机 | 电力转换装置、电力转换系统以及电力转换方法 |
WO2020230273A1 (ja) * | 2019-05-14 | 2020-11-19 | 東芝三菱電機産業システム株式会社 | 電力変換装置の欠相検出装置 |
US11594982B2 (en) * | 2019-09-13 | 2023-02-28 | Denryo Co., Ltd. | Parallel inverter device |
US20220289033A1 (en) * | 2021-03-09 | 2022-09-15 | Shanghai XPT Technology Limited | Vehicle control method and vehicle drive system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001327173A (ja) * | 2000-05-17 | 2001-11-22 | Nissan Motor Co Ltd | モータ制御用pwmインバータ |
JP2012085379A (ja) * | 2010-10-07 | 2012-04-26 | Hitachi Appliances Inc | モータ制御システム |
JP5354369B2 (ja) * | 2009-09-09 | 2013-11-27 | 株式会社デンソー | 電力変換装置 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5488286A (en) * | 1993-05-12 | 1996-01-30 | Sundstrand Corporation | Method and apparatus for starting a synchronous machine |
JP4502734B2 (ja) * | 2004-07-15 | 2010-07-14 | 三菱電機株式会社 | 電動機の回転位置検出装置の原点オフセット量算出方法およびこの算出方法を用いた電動機制御装置 |
JP4029904B2 (ja) * | 2006-04-28 | 2008-01-09 | ダイキン工業株式会社 | マトリックスコンバータおよびマトリックスコンバータの制御方法 |
CN100433536C (zh) * | 2007-01-15 | 2008-11-12 | 南京航空航天大学 | 基于电压空间矢量的调制方法 |
JP4770883B2 (ja) * | 2008-06-25 | 2011-09-14 | 株式会社デンソー | 回転機の制御装置、及び回転機の制御システム |
WO2011064970A1 (ja) * | 2009-11-26 | 2011-06-03 | パナソニック株式会社 | 負荷駆動システム、電動機駆動システム、および車両制御システム |
JP5045799B2 (ja) * | 2010-08-27 | 2012-10-10 | 株式会社デンソー | 電力変換装置、駆動装置、及び、これを用いた電動パワーステアリング装置 |
US9819297B2 (en) * | 2010-09-15 | 2017-11-14 | Mitsubishi Electric Corporation | Power conversion device, motor including the same, air conditioner having the motor incorporated therein, and ventilation fan having the motor incorporated therein |
JP5477659B2 (ja) | 2010-12-17 | 2014-04-23 | アイシン・エィ・ダブリュ株式会社 | 回転電機制御装置 |
JP5348153B2 (ja) * | 2011-02-14 | 2013-11-20 | 株式会社デンソー | 回転機の制御装置 |
US9088241B2 (en) * | 2012-03-02 | 2015-07-21 | Deere & Company | Drive systems including sliding mode observers and methods of controlling the same |
CN103597731B (zh) * | 2012-04-11 | 2015-06-10 | 三菱电机株式会社 | 功率转换装置 |
JP5652434B2 (ja) * | 2012-06-15 | 2015-01-14 | 株式会社デンソー | モータ制御装置、及び、これを用いた電動パワーステアリング装置 |
JP5915675B2 (ja) * | 2014-02-21 | 2016-05-11 | トヨタ自動車株式会社 | 電動車両 |
-
2015
- 2015-02-16 CN CN201580075775.8A patent/CN107210702B/zh active Active
- 2015-02-16 EP EP15882532.3A patent/EP3261247B1/en active Active
- 2015-02-16 JP JP2017500492A patent/JP6250222B2/ja not_active Expired - Fee Related
- 2015-02-16 US US15/544,351 patent/US10374503B2/en active Active
- 2015-02-16 WO PCT/JP2015/054112 patent/WO2016132427A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001327173A (ja) * | 2000-05-17 | 2001-11-22 | Nissan Motor Co Ltd | モータ制御用pwmインバータ |
JP5354369B2 (ja) * | 2009-09-09 | 2013-11-27 | 株式会社デンソー | 電力変換装置 |
JP2012085379A (ja) * | 2010-10-07 | 2012-04-26 | Hitachi Appliances Inc | モータ制御システム |
Non-Patent Citations (1)
Title |
---|
See also references of EP3261247A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3651351A4 (en) * | 2017-07-03 | 2020-06-24 | Mitsubishi Electric Corporation | POWER CONVERSION DEVICE AND ELECTRIC POWER STEERING DEVICE |
WO2022130480A1 (ja) * | 2020-12-15 | 2022-06-23 | 三菱電機株式会社 | 電力変換装置 |
JP7504230B2 (ja) | 2020-12-15 | 2024-06-21 | 三菱電機株式会社 | 電力変換装置 |
Also Published As
Publication number | Publication date |
---|---|
EP3261247B1 (en) | 2022-07-06 |
JP6250222B2 (ja) | 2017-12-20 |
US20180269771A1 (en) | 2018-09-20 |
JPWO2016132427A1 (ja) | 2017-05-18 |
US10374503B2 (en) | 2019-08-06 |
EP3261247A1 (en) | 2017-12-27 |
CN107210702A (zh) | 2017-09-26 |
EP3261247A4 (en) | 2018-12-05 |
CN107210702B (zh) | 2019-08-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6250222B2 (ja) | 電力変換装置 | |
JP6250221B2 (ja) | 電力変換装置 | |
JP6735827B2 (ja) | 電力変換装置 | |
EP3070835B1 (en) | Power conversion device | |
JP6266161B2 (ja) | 交流回転機の制御装置および電動パワーステアリングの制御装置 | |
US11218107B2 (en) | Control device for power converter | |
JPWO2019008676A1 (ja) | インバータ装置、及び、電動パワーステアリング装置 | |
JP5333256B2 (ja) | 交流回転機の制御装置 | |
JP2013183565A (ja) | 電流形電力変換装置 | |
US10608572B2 (en) | Motor drive control device | |
JPWO2016117047A1 (ja) | 交流回転機の制御装置および電動パワーステアリングの制御装置 | |
JP2017093073A (ja) | 電力変換装置 | |
JP2011217575A (ja) | 電力変換装置 | |
US10526007B2 (en) | Power conversion device, control method for same, and electric power steering control device | |
US9935575B2 (en) | Power conversion device and control method for same, and electric power steering control device | |
JP5853644B2 (ja) | 線電流検出装置および電力変換システム | |
JP6409945B2 (ja) | マトリックスコンバータ | |
JP6292021B2 (ja) | マトリックスコンバータ | |
JP6132752B2 (ja) | 電力変換装置および電動車両 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 15882532 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2017500492 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15544351 Country of ref document: US |
|
REEP | Request for entry into the european phase |
Ref document number: 2015882532 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |