WO2022201328A1 - 電力変換装置及び電力変換装置の制御方法 - Google Patents
電力変換装置及び電力変換装置の制御方法 Download PDFInfo
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- WO2022201328A1 WO2022201328A1 PCT/JP2021/012063 JP2021012063W WO2022201328A1 WO 2022201328 A1 WO2022201328 A1 WO 2022201328A1 JP 2021012063 W JP2021012063 W JP 2021012063W WO 2022201328 A1 WO2022201328 A1 WO 2022201328A1
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- controller
- power conversion
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- state quantity
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004891 communication Methods 0.000 claims description 164
- 230000006835 compression Effects 0.000 abstract description 10
- 238000007906 compression Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 38
- 230000005540 biological transmission Effects 0.000 description 11
- 238000001514 detection method Methods 0.000 description 8
- 239000013598 vector Substances 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000004931 aggregating effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—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
- 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
- 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
Definitions
- the disclosed embodiment relates to a power conversion device and a control method for the power conversion device.
- the sum and average values of the output current vectors representing the inverter currents are calculated by the transmission control central unit and fed back to each inverter. At this time, if the number of inverters increases, there is a problem that it takes time to transmit the output current vector.
- An object of one aspect of the embodiments is to provide a power conversion device and a control method for the power conversion device that transmit state quantities of a plurality of inverters at high speed.
- a power converter includes a main controller, a plurality of sub-controllers, and a relay unit.
- the main controller generates a control command, which is a target value for controlling power conversion performed by the plurality of power conversion units, based on state quantity information regarding the state quantity of each of the plurality of power conversion units that receive power from the load. and output.
- the sub-controller is arranged for each of the power converters, controls the power converters based on the control commands, and acquires and outputs the state quantities.
- the relay section compresses the state quantities output from the plurality of sub-controllers to generate the state quantity information, and transmits the state quantity information to the main controller side.
- a control method for a power converter includes power conversion performed by the plurality of power conversion units using state quantity information related to state quantities for each of the plurality of power conversion units that receive power from a load. generating and outputting a control command that is a target value for controlling the power conversion unit, controlling the power conversion unit based on the control command for each power conversion unit, and acquiring and outputting the state quantity and compressing the plurality of output state quantities to generate the state quantity information, and using the state quantity information to generate the control command.
- a power conversion device and a control method for the power conversion device that can transmit current values of a plurality of inverters at high speed.
- FIG. 1 is a diagram illustrating a configuration example of a power converter according to a first embodiment.
- FIG. 2 is a diagram showing a configuration example of a sub-controller according to the first embodiment.
- FIG. 3 is a diagram showing a configuration example of the main controller of the first embodiment.
- FIG. 4 is a diagram illustrating a configuration example of a relay controller according to the first embodiment;
- FIG. 5A is a diagram showing a configuration example of communication data according to the first embodiment.
- FIG. 5B is a diagram showing an example of status.
- FIG. 6 is a diagram illustrating an example of transmission of communication data according to the first embodiment.
- 7A is a diagram illustrating an example of a control method of the main controller according to the first embodiment;
- FIG. 7B is a diagram illustrating an example of a control method for a relay controller according to the first embodiment
- FIG. 7C is a diagram illustrating an example of a control method for the sub-controllers according to the first embodiment
- FIG. 8 is a diagram illustrating a configuration example of a power converter according to the second embodiment.
- FIG. 9 is a diagram showing a configuration example of a sub-controller according to the second embodiment.
- FIG. 10 is a diagram showing another configuration example of the power conversion device of the second embodiment.
- FIG. 11A is a diagram illustrating a configuration example of a relay controller according to the third embodiment
- FIG. 11B is a diagram illustrating a configuration example of a main controller according to the third embodiment;
- FIG. 1 is a diagram illustrating a configuration example of a power converter according to a first embodiment.
- FIG. 1 is a block diagram showing a configuration example of the power conversion device 1.
- This power converter 1 controls a plurality of power converters (power converters 4 described later) that supply power to a load such as a motor.
- the power conversion device 1 performs the above-described control under the control of a higher control device.
- the power conversion device 1 includes a main controller 10 , a relay section 20 and a plurality of sub-controllers 40 . It should be noted that the power conversion device 1 in the figure represents an example including eight sub-controllers (sub-controller 40a to sub-controller 40h).
- the main controller 10 is connected to a higher-level control device via a communication path 51. Also, the main controller 10 is connected to the relay section 20 via a communication path 52 . In the example shown in the figure, the main controller 10 is connected to the relay unit 20 via communication paths 52a and 52b.
- the relay unit 20 is connected to the sub-controller 40 by a communication path 54.
- the relay section 20 is connected to the sub-controllers 40a to 40h via a plurality of communication paths 54a and 54b.
- the relay unit 20 has a relay controller 30.
- the relay unit 20 in the figure represents an example in which a plurality of tree-connected relay controllers 30 are provided.
- the relay unit 20 in the figure has six relay controllers 30 that are connected in a two-stage tree.
- the relay controller 30 is connected to a device on the main controller 10 side via one communication path, and can be connected to a plurality of devices on the sub-controller 40 side via respective communication paths. This allows the relay controllers 30 to be connected in a tree.
- the relay controller 30 in the figure represents an example of being connected to two devices on the sub-controller 40 side.
- the first stage relay controller 30a of the relay section 20 is connected to the main controller 10 via the communication path 52a, and the relay controller 30c and the relay controller 30d are connected via the communication paths 53a and 53b, respectively. Connected.
- the first-stage relay controller 30b of the relay unit 20 is also connected in the same manner.
- a relay controller 30c in the second stage of the relay unit 20 is connected to the above relay controller 30a via the communication path 53a, and is connected to the sub-controller 40a and the sub-controller 40b via the communication path 54a and the communication path 54b. connected to each other.
- the second-stage relay controller 30d of the relay unit 20 is also connected in the same manner.
- relay controller 30e of the second stage of the relay unit 20 is connected to the relay controller 30b described above via the communication path 53a described above, and to the sub-controller 40e and the sub-controller 40f via the communication paths 54a and 54b. connected to each other.
- the relay controller 30f on the second stage of the relay unit 20 is also connected in the same manner.
- the communication paths 51, 52, 53 and 54 communication paths for serial communication can be used.
- the communication path 52 and the like can be configured by a full-duplex communication path and a half-duplex communication path.
- FIG. 2 is a diagram showing a configuration example of a sub-controller according to the first embodiment.
- This figure is a block diagram showing a configuration example of the sub-controller 40.
- the motor 2, the power conversion unit 4, and the sensor unit 3 are also shown in FIG.
- a power converter 4 shown in the figure supplies power to the motor 2 .
- a sub-controller 40 controls this power converter 4 .
- this figure shows an example in which a plurality of power converters 4a to 4h connected in parallel are connected to the motor 2, as in FIG.
- one motor 2 is driven by a plurality of power converters 4a to 4h.
- the sub-controllers 40a-40h and the sensor units 3a-3h are arranged for each of the power conversion units 4a-4h.
- a three-phase induction motor can be applied to the motor 2.
- the power converter 4 can use a circuit in which a plurality of switch elements are connected in a three-phase bridge.
- the power converter 4 is connected to the motor 2 by U-phase, V-phase and W-phase lines, converts DC power supplied from a power supply (not shown) into AC power, and supplies the AC power to the motor 2 .
- the alternating current supplied to the motor 2 is PWM (Pulse Width Modulation) controlled to adjust the power. Thereby, the rotational speed and torque of the motor 2 are controlled.
- PWM control is performed by the sub-controller 40 , and the power converter 4 supplies AC power to the motor 2 in response to a PWM control signal based on the PWM control from the sub-controller 40 .
- the sub-controller 40 detects the state quantity of the motor 2. A current value flowing through the motor 2 is assumed as this state quantity. In this case, the voltage command corresponds to the control command.
- the sub-controller 40 receives the voltage command via the communication path 54 , generates a PWM control signal according to the voltage command, and outputs the PWM control signal to the power converter 4 .
- the sub-controller 40 may correct the voltage command based on the detected current value flowing through the motor 2 and generate a PWM control signal according to the corrected voltage command. For example, the sub-controller 40 receives the current command used to generate the voltage command together with the voltage command via the communication path 54, and corrects the voltage command based on the current command and the detected current value flowing through the motor 2.
- This PWM control signal is input to the switch element of the power converter 4, for example, the gate terminal of the IGBT.
- the sub-controller 40 drives the switch elements of the power conversion section 4 with the PWM signal corresponding to the voltage command to cause the power conversion section 4 to generate the output voltage corresponding to the voltage command.
- the sub-controller 40 controls the power conversion in the power converter 4 so that the required power is supplied to the motor 2 .
- the voltage command is generated by the main controller 10 .
- the line currents of the U-phase line, the V-phase line, and the W-phase line of the power conversion section 4 can be detected by the sensor section 3 .
- the sensor unit 3 is arranged for each power conversion unit 4 and can be composed of three current sensors respectively corresponding to the U-phase line, the V-phase line, and the W-phase line.
- a sensor using a current transformer or a Hall element can be used for this current sensor.
- These current sensors output analog signals corresponding to the line current.
- the current detected by the sensor unit 3 is transmitted to the sub-controller 40 through the signal line Iu, the signal line Iv, and the signal line Iw corresponding to the U-phase line, the V-phase line, and the W-phase line, respectively.
- the current sensors need not be provided for all three phases of the U-phase line, the V-phase line, and the W-phase line. On the premise that the sum of the currents of the three phases is zero, only any two phases may be provided, and the currents of the remaining phases may be calculated from the two line currents detected by the current sensor.
- the sub-controller 40 in the figure includes a higher-level communication port 41, a control section 42, a drive section 43, and a current detection section 44.
- the host communication port 41 communicates with the relay controller 30, which is a host device. This upper communication port 41 is connected to the relay controller 30 via a communication path 54 .
- the host communication port 41 receives control commands and the like transmitted by the relay controller 30 and transmits state quantities and statuses to the relay controller 30 .
- the control unit 42 controls data transmission/reception in at least the sub-controller 40 . Specifically, the control unit 42 outputs a control command received from the host communication port 41 via the communication path 54 to the driving unit 43, and outputs the current value detected by the current detection unit 44 as a state quantity to the host communication port 41. from through the communication path 54 . Also, the control unit 42 generates a status and similarly transmits it from the upper communication port 41 via the communication path 54 .
- the drive section 43 drives the power conversion section 4 .
- This drive unit 43 generates a control signal for the power conversion unit 4 based on the control command output from the control unit 42 .
- the drive unit 43 compares the control command with the triangular wave to generate a PWM control signal and outputs it to the power conversion unit 4 .
- the controller 42 may generate the PWM control signal by a space vector control method.
- the control unit 42 may use the current value detected by the current detection unit 44 as a state quantity, correct the control command based on this state quantity, and generate the PWM control signal based on the corrected control command.
- the current detection unit 44 outputs the current value output from the sensor unit 3 to the driving unit 43 and the control unit 42 as state quantities.
- the current detection unit 44 includes an analog-to-digital converter, converts the analog current value output from the sensor unit 3 into a digital current value, and outputs the digital current value to the driving unit 43 and the control unit 42 .
- control unit 42, the driving unit 43, and the current detection unit 44 are capable of detecting state quantities, transmitting the detected state quantities from the upper communication port 41, and receiving them from the higher communication port 41.
- these configurations and processing contents of each unit may differ depending on the sub-controllers 40a to 40h.
- FIG. 3 is a diagram showing a configuration example of the main controller of the first embodiment. This figure is a block diagram showing a configuration example of the main controller 10. As shown in FIG. The main controller 10 shown in FIG.
- the upper communication port 11 communicates with a higher control device. This upper communication port 11 is connected to a communication path 51 .
- the lower communication ports 13 and 14 communicate with a device on the side of the sub-controller 40, which is a lower device.
- the lower communication ports 13 and 14 are connected to the relay controller 30 via different communication paths 52, respectively.
- the lower communication ports 13 and 14 transmit control commands and receive state quantities and statuses from the relay controller 30 .
- the control unit 12 controls at least the generation of control commands and the transmission and reception of data in the main controller 10 . Specifically, the control unit 12 generates a control command for the power conversion unit 4 based on the state quantity of each power conversion unit 4 driven by the sub-controller 40 . For example, the control unit 12 acquires a control target that is received via the communication path 51 from a higher-level control device or input from an IO device (not shown) attached to the main controller 10 . The control target corresponds to, for example, a speed command or a torque command for the motor 2 . The control unit 12 generates the target value of the state quantity from this control target. A current command is assumed as the target value of this state quantity.
- a control command which is a target value for controlling the power conversion performed by the power conversion unit 4, is generated based on the sum of the current values, which are the state quantities detected by the sub-controllers 40, and the current command.
- a voltage command for example, corresponds to the control command.
- the generation of the control command includes, for example, generation of a voltage target based on a current command according to vector control of an AC motor, and correction of the voltage target based on a difference value between the current command and the sum of a plurality of current values to correct the voltage command. Including generation.
- the control unit 12 performs feedback control by outputting the voltage command, which is the control command, to the sub-controller 40 side.
- the control command generated by the main controller 10 and transmitted via the relay controller 30 updates the control command for the drive unit 43 .
- State quantities are also input to the lower communication ports 13 and 14 from the respective relay controllers 30 .
- the control unit 12 adds these state quantities to generate the sum of the state quantities described above.
- a relay controller 30 is arranged between the main controller 10 and the sub-controller 40 . State quantities from the sub-controller 40 are transmitted to the main controller 10 via the relay controller 30 . At this time, the relay controller 30 can generate state quantity information by compressing a plurality of state quantities, and transmit the state quantity information to the main controller 10 side. As will be described later, this information compression can be performed by adding state quantities. Further, when the state quantity information is transmitted from the lower relay controller 30, the relay controller 30 further compresses the state quantity information. This can be done by adding state quantity information. The addition of these state quantities and state quantity information is an example of information compression in the relay controller 30 .
- the main controller 10 generates a control command based on the state quantity information regarding the state quantity. Specifically, the main controller 10 can add state quantity information from a plurality of relay controllers 30 to generate a sum of state quantities. Details of the state quantity information will be described later.
- FIG. 4 is a diagram illustrating a configuration example of a relay controller according to the first embodiment; This figure is a block diagram showing a configuration example of the relay controller 30. As shown in FIG. The relay controller 30 shown in FIG.
- the host communication port 31 communicates with either the main controller 10, which is a host device, or the relay controller 30 on the main controller 10 side.
- the relay controller 30 in the figure represents an example of being connected to the relay controller 30 on the main controller 10 side.
- the host communication port 31 in the figure is connected to the communication path 53 .
- the upper communication port 31 transmits state quantity information and status, and receives control commands.
- the lower-order communication ports 33 and 34 communicate with either the sub-controller 40, which is a lower-order device, or the relay controller 30 on the side of the sub-controller 40.
- the lower communication ports 33 and 34 in the figure are connected to the sub-controller 40 via different communication paths 54, respectively.
- the lower communication ports 33 and 34 transmit control commands and receive state quantities and state quantity information and statuses.
- the control unit 32 controls at least generation of state quantity information and data transmission/reception in the relay controller 30 . Specifically, the control unit 32 transmits the control command from the main controller 10 side received by the upper communication port 31 to the sub-controller 40 side via the lower communication ports 33 and 34 . Also, the control unit 32 performs information compression. When the lower communication ports 33 and 34 are connected to the sub-controller 40, the control unit 32 compresses the received state quantity to generate state quantity information. When the lower communication ports 33 and 34 are connected to the relay controller 30, the control unit 12 further compresses the received state quantity information to generate new state quantity information.
- the control unit 32 can perform information compression by adding a plurality of state quantities input to itself.
- the state quantity information generated by information compression corresponds to the sum of a plurality of state quantities input to itself.
- the control unit 32 can perform information compression of state quantity information by adding a plurality of pieces of state quantity information input thereto to generate new state quantity information.
- the control unit 32 can also generate a new status by aggregating the statuses received by the lower communication ports 33 and 34 and have it transmitted from the upper communication port 31 . Details of status aggregation will be described later.
- FIG. 5A is a diagram illustrating an example of communication data according to the first embodiment; This figure shows an example of the communication data 100 transmitted over the communication paths 52-54.
- This communication data 100 represents an example corresponding to serial communication.
- Communication data 100 includes flag 101 , data 110 , CRC 102 and flag 103 .
- the flag 101 is data indicating the beginning of communication data.
- a flag 103 is data indicating the end of communication data.
- Data 110 is the data body transmitted by communication data 100 .
- CRC 102 is a code for detecting data errors by a cyclic redundancy check (CRC).
- Data 110 in communication data 100 when transmitted from the main controller 10 side has a control command 111 . Further, it is also possible to adopt a configuration that further includes a command indicating an instruction to the sub-controller 40 or the like, an address of the sub-controller 40, or the like.
- Data 110 in communication data 100 when transmitted from sub-controller 40 has state quantity 121 and status 130 .
- the state quantity 121 corresponds to the current value of the power converter 4 for each sub-controller 40 .
- state quantity information is arranged instead of state quantity 121 .
- FIG. 5B is a diagram showing an example of status. This figure shows an example of the status 130.
- a status 130 in the figure represents an example composed of a plurality of status bits.
- a status 130 in FIG. 10 includes status bits for error status 131 and operable status 132 .
- the error status 131 is a status bit representing an error state in the sub-controller 40 or the like.
- the error status 131 can be, for example, the value "1" when an error occurs.
- Error status 131 may be a plurality of status bits representing the condition that caused the error for each of the plurality of error items.
- the operable status 132 is a status bit representing the operable state in the sub-controller 40 . Ready status 132 may, for example, have a value of "1" when ready.
- the relay controller 30 aggregates the two statuses received by the lower communication ports 33 and 34 to generate a new status. This aggregation can be done as follows. In the error status 131 , a logical OR operation is performed on the error statuses 131 of the two statuses 130 to generate a new 1-bit error status 131 . As a result, when at least one error status 131 of the two statuses 130 is in an error state (value "1"), the error state can be transmitted to the main controller 10 side.
- the operable status 132 a logical product operation is performed on the operable status 132 of each of the two statuses 130 to generate a new 1-bit operable status 132.
- the operable statuses 132 of the two statuses 130 are both operable (value "1"), the operable state can be transmitted to the main controller 10 side. In this way, aggregation methods can be applied according to the status bits.
- FIG. 6 is a diagram illustrating an example of transmission of communication data according to the first embodiment. This figure shows transmission of state quantities from the sub-controller 40 to the main controller 10 shown in FIG. 1 and transmission of state quantity commands from the main controller 10 to the sub-controller 40 . Furthermore, FIG. 2 shows how state quantities and the like are transmitted between the relay controllers 30 . 1, the main controller 10, the relay controllers 30a, 30c and 30d, and the sub-controllers 40a to 40d of FIG. 1 are shown.
- Sub-controller 40a represents communication data transmitted and received by the sub-controller 40a, sub-controller 40b and relay controller 30c respectively.
- Sub-controller 40c represents communication data transmitted and received by the sub-controller 40c, sub-controller 40d and relay controller 30d, respectively.
- Relay controller 30a represents communication data transmitted and received by relay controller 30a.
- T1, T2, T3, T4, T5 and T6 represent communication periods.
- T1, T2 and T3 are communication periods during which state quantities are transmitted from the sub-controller 40 to the main controller 10
- T4, T5 and T6 are communication periods during which state quantity commands are transmitted from the main controller 10 to the sub-controller 40. period.
- the current value is assumed to be the state quantity
- the voltage command is assumed to be the state quantity command.
- the sub-controllers 40 a - 40 d detect current values corresponding to the state quantities of the power conversion section 4 .
- Ia, Ib, Ic and Id in the figure represent current values detected by the sub-controllers 40a, 40b, 40c and 40d, respectively.
- the sub-controllers 40a-40d transmit current values via the communication path .
- the sub-controllers 40a and 40b transmit current values to the relay controller 30c.
- the sub-controllers 40c and 40d transmit current values to the relay controller 30d.
- the relay controller 30c adds the transmitted current values Ia and Ib (addition 1) to generate the current sum Im1. Further, the relay controller 30d adds the transmitted current values Ic and Id (addition 1) to generate a current sum Im2. Next, the relay controller 30c and the relay controller 30d transmit the current sums Im1 and Im2 to the relay controller 30a via the communication path 53, respectively.
- the relay controller 30a adds the transmitted current sums Im1 and Im2 (addition 2) to generate the current sum Im3.
- the relay controller 30 a transmits the current sum Im3 to the main controller 10 via the communication path 52 .
- the addition 1 in the figure can be performed in a shorter time than the transmission time of the current sum Im1. Therefore, the communication period T2 can have the same length as the communication period T1. This also applies to the communication period T3.
- the main controller 10, the relay controllers 30b, 30e and 30f, and the sub-controllers 40e to 40h transmit state quantities during the communication periods T1, T2 and T3.
- the relay controller 30 adds a plurality of state quantities and generates and transmits state quantity information corresponding to the partial sum of the state quantities with respect to the total sum of all state quantities.
- the amount of data to be processed can be reduced.
- the time required for each communication period (communication periods T1, T2, T3) required for transmitting the state quantity can be shortened, and the communication time required for transmitting all the state quantities can be shortened.
- the main controller 10 generates a voltage command corresponding to the state quantity command.
- VC in the figure represents a voltage command generated by the main controller 10 .
- the main controller 10 transmits the voltage command VC to the relay controller 30a via the communication path 52.
- the relay controller 30a transmits the voltage command VC to the relay controllers 30c and 30d via the communication path 53.
- the relay controllers 30c and 30d transmit the voltage command VC to the sub-controllers 40a-40d via the communication path .
- Relay controller 30c transmits voltage command VC to sub-controllers 40a and 40b.
- Relay controller 30d transmits voltage command VC to sub-controllers 40c and 40d.
- Control commands are similarly transmitted to the main controller 10, the relay controllers 30b, 30e and 30f and the sub-controllers 40e to 40h during the communication periods T4, T5 and T6.
- the state quantity command (voltage command) generated by the main controller 10 is transmitted (distributed) to the sub-controller 40 via the relay controller 30 .
- [Method for controlling current conversion device] 7A is a diagram illustrating an example of a control method of the main controller according to the first embodiment; FIG. This figure is a flowchart showing an example of the control method, taking the main controller 10 shown in FIG. 3 as an example.
- the main controller 10 acquires a control target (step S101).
- the main controller 10 acquires state quantity information (step S102). This can be done by acquiring the state quantity information received by the lower communication ports 13 and 14 .
- the main controller 10 generates a control command (step S103).
- the control command generated by the main controller 10 is sent (step S104).
- step S106 the main controller 10 waits until the control cycle starts (step S106, No), and when the control cycle starts (step S106, Yes), the process proceeds to step S101.
- a state quantity input start command of the sub-controller 40 which will be described later, can be applied to start the control cycle.
- FIG. 7B is a diagram showing an example of the control method of the relay controller of the first embodiment.
- This figure is a flow chart showing an example of the control method, taking the relay controller 30 in FIG. 4 as an example.
- the relay controller 30 determines control command acquisition (step S111). This can be done based on whether or not a control command has been received from the device on the main controller 10 side in the tree connection.
- the acquired control command is sent out (step S112). This can be done by sending a control command to the device on the sub-controller 40 side in the tree connection. After that, the process returns to step S111.
- step S111 when the control command is not acquired (step S111, No), the process proceeds to step S113.
- step S113 the relay controller 30 determines acquisition of state information or state quantity information (step S113). This can be done based on whether state information or state quantity information is received from the device on the side of the sub-controller 40 in the tree connection.
- step S113 Yes
- the state information is generated based on the state information or the state quantity information (step S114).
- the generated state information is sent (step S115). This can be done by sending the generated state information to the device on the main controller 10 side in the tree connection. After that, the process returns to step S111.
- step S113 if the state information or state quantity information has not been acquired (step S113, No), the process returns to step S111.
- FIG. 7C is a diagram showing an example of the control method of the sub-controllers of the first embodiment.
- This figure is a flowchart showing an example of the control method, taking the sub-controller 40 shown in FIG. 2 as an example.
- the sub-controller 40 outputs a state quantity input start command (step S121). For example, this corresponds to the output of an AD conversion start command for the state quantity (current value) to the current detection unit 44 described with reference to FIG.
- the sub-controller 40 acquires a control command (step S122). This can be done by acquiring the control command received by the upper communication port 41 .
- the sub-controller 40 acquires the state quantity (step S123). This can be performed by the controller 42 acquiring the state quantity (current value) detected by the current detector 44 .
- a control signal for the power converter 4 is generated (step S124). This can be done by the drive section 43 generating a control signal based on the control of the control section 42 .
- the sub-controller 40 sends out a control signal (step S125). Thereby, the generated control signal is sent to the power converter 4 .
- the sub-controller 40 sends out the state quantity (step S126). This can be done by sending the generated state quantity to the device on the main controller 10 side in the tree connection.
- the sub-controller 40 waits until the end of the control cycle (step S127, No), and when the control cycle ends (step S127, Yes), the process proceeds to step S121.
- control cycle referred to here is that the sub-controller 40 outputs a state quantity input start command, the state quantity acquired (detected) by the sub-controller 40 is transmitted to the main controller 10 via the relay controller 30, and the main controller 10 generates a control command based on the received state quantity, the control command is transmitted to the sub-controller 40 via the relay controller 30, the sub-controller 40 generates a control signal based on the received control command, and the power conversion unit
- the control cycle may be set to a time length longer than the time required to send out to 4.
- control cycle may be a control cycle with a length of time longer than the processing time of the controller with the longest processing time among the sub-controller 40, the relay controller 30, and the main controller 10.
- the sub-controller 40, the relay controller 30, and the main controller 10 simultaneously perform the processes shown in the flow charts of FIGS. 7C, 7B, and 7A in each control period.
- the sub-controller 40 detects the state quantity, generates a control command based on this state quantity, and until the control signal based on this control command is sent to the power conversion unit 4, the stage number of the relay controller 30 is set to j. Then, the processing is performed in a time that is (2j+2) times the control cycle.
- state quantities, control commands and control signals are updated every control cycle.
- the relay controller 30 compresses a plurality of state quantities and transmits the state quantity information while generating it, whereby the amount of data transmitted to the main controller 10 can be reduced. It can be done fast.
- FIG. 8 is a diagram illustrating a configuration example of a power converter according to the second embodiment.
- This figure is a diagram showing a configuration example of the relay controller 30 and the sub-controller 40 at the lowest stage of the relay unit 20 of the power converter 1 .
- the relay controller 30 shown in the figure differs from the power converter 1 shown in FIG. 1 in that a plurality of sub-controllers 40 are connected.
- the relay controller 30 in the figure represents an example in which three sub-controllers 40 are connected in series to communication paths 54a and 54b connected to lower communication ports 33 and 34, respectively.
- Sub-controllers 40i, 40j and 40k are connected to the communication path 54a, and sub-controllers 40l, 40m and 40n are connected to the communication path 54b.
- the sub-controllers 40i and 40j are connected by a communication path 55a, and the sub-controllers 40j and 40k are connected by a communication path 55c.
- the sub-controllers 40l and 40m are connected by a communication path 55b, and the sub-controllers 40m and 40n are connected by a communication path 55d.
- a communication path for serial communication can be applied to the communication paths 55a, 55b, 55c, and 55d in the same manner as the communication path 54a.
- FIG. 9 is a diagram showing a configuration example of a sub-controller according to the second embodiment. This figure is a block diagram showing a configuration example of the sub-controller 40. As shown in FIG. The sub-controller 40 in FIG. 2 differs from the sub-controller 40 in FIG. 2 in that it further includes a lower communication port 45 .
- the lower communication port 45 communicates with the sub-controller 40, which is a lower device. This lower communication port 45 is connected to another subcontroller 40 via a communication path 55 .
- the control unit 42 in the figure receives control instructions via the upper communication port 41 and transmits the control instructions to the other sub-controllers 40 via the lower communication port 45 . Also, the control unit 42 receives the state quantity via the lower communication port 45 and transmits the state quantity to the relay controller 30 or other sub-controllers 40 via the higher communication port 41 .
- a plurality of sub-controllers 40 connected in series transmit state quantities detected by themselves to a higher-level device (relay controller 30 or other sub-controllers 40) and relay the state quantities of lower-level sub-controllers 40.
- each sub-controller 40 adds the state quantity or state quantity information received from the lower sub-controller 40 and the state quantity detected by itself to create new state quantity information. Transmission to the sub-controller 40 or relay controller 30 may be performed.
- FIG. 10 is a diagram showing another configuration example of the power conversion device of the second embodiment.
- the power conversion device 1 of FIG. 8 differs from the power conversion device 1 of FIG. 8 in that a plurality of sub-controllers 40 are bus-connected.
- the sub-controllers 40i, 40j and 40k in the figure are commonly connected by a bus 56a, and the sub-controllers 40l, 40m and 40n are commonly connected by a bus 56b.
- the buses 56a and 56b are also connected to the lower communication ports 33 and 34 of the relay controller 30, respectively.
- each sub-controller occupies the bus in a time division manner and transmits state quantities to the relay controller 30 .
- the sub-controller 40i transmits the state quantity to the relay controller 30 in the first communication period
- the sub-controller 40j transmits the state quantity to the relay controller 30 in the next communication period
- the next communication period transmits the state quantity to the relay controller 30 at .
- a plurality of sub-controllers 40 can be connected to the relay controller 30 at the last stage of the relay section 20 .
- the sub-controller 40 connected to the power conversion device 1 can be arranged with a degree of freedom. In addition, expansion of the sub-controller 40 can be easily performed.
- FIG. 11A is a diagram illustrating a configuration example of a relay controller according to the third embodiment; This figure is a block diagram showing a configuration example of the relay controller 30.
- the relay controller 30 of the third embodiment differs from the relay controller 30 of FIG. 4 in that it has three or more lower communication ports 33 and the like.
- the relay controller 30 shown in FIG. The lower communication ports 33 , 34 , 35 and 36 are connected to other relay controllers 30 or subcontrollers 40 via communication paths 54 .
- the control unit 32 transmits the control command from the main controller 10 received by the upper communication port 31 to the sub-controller 40 via the lower communication ports 33, 34, 35 and 36.
- the control unit 32 also compresses the state quantity and state quantity information received by the lower communication ports 33 , 34 , 35 and 36 and causes the compressed state quantity information to be transmitted to the upper communication port 31 .
- the relay controller 30 with three or more lower communication ports 33 and the like, more lower devices can be connected.
- the sub-controllers 40 can be divided into n groups of the following equations.
- the main controller 10 can also be configured to have one lower communication port 13 .
- one relay controller 30 connected to the lower communication port 13 generates the sum of state quantities and sends it to the main controller 10 from the upper communication port 31 of the relay controller 30 .
- n and i that satisfy the expression (1) By appropriately determining n and i that satisfy the expression (1) according to the actual arrangement of the power conversion unit 4 and the sub-controller 40, the number of stages of the relay controllers 30 connected in a tree can be optimized, and the communication time can be shortened to the optimum length. Moreover, since only the relay controller 30 performs information compression of the state quantity, the processing of the main controller 10 can be simplified.
- FIG. 11B is a diagram illustrating a configuration example of a main controller according to the third embodiment; This figure is a block diagram showing a configuration example of the main controller 10.
- the main controller 10 of the third embodiment differs from the relay controller 30 in FIG. 3 in that it has three or more lower communication ports 13 and the like.
- the main controller 10 in FIG. 11 includes four lower communication ports 13, 14, 15 and 16, like the relay controller 30 in FIG. 11A. These lower communication ports 13 and the like are connected to the relay controller 30 via the communication path 52 .
- the main controller 10 in the figure adds the state quantity information received by the lower communication ports 13, 14, 15 and 16 when generating a control command. This corresponds to the main controller 10 performing the final information compression of the state quantity information.
- the main controller 10 and the plurality of relay controllers 30 are connected in a tree.
- n and i that satisfy the formula (1) can be appropriately determined.
- j can be 3 (three stages) by setting i and n to 2 and 8, respectively.
- the number of relay controllers 30 connected in a tree can be reduced.
- the communication time of the state quantity can be optimized.
- the power conversion device 1 has a configuration in which the outputs of a plurality of power conversion units 4 are connected in parallel, the configuration is not limited to this example.
- the power converter 1 may have a configuration in which the outputs of a plurality of power converters 4 are connected in series.
- the sub-controller 40 detects the voltage value output by the power converter 4 as a state quantity, and the relay controller 30 generates and transmits state quantity information that is a partial sum of these voltage values.
- the main controller 10 outputs an output voltage command of the power conversion device 1, which is a control command, based on the difference between the target value of the output voltage of the power conversion device 1, which is a control target, and the sum of the output voltages of the power conversion units 4. Generate.
- the power conversion device 1 is a control device that drives a motor, it is not limited to this example.
- various power supply devices that supply power to loads other than the motor 2 can be used.
- a power conditioner that exchanges electric power between a power generation device using natural energy, such as a photovoltaic power generation device and a wind power generation device, and a system can also be used.
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Abstract
Description
[電力変換装置の構成]
図1は、第1の実施形態の電力変換装置の構成例を示す図である。同図は、電力変換装置1の構成例を表すブロック図である。この電力変換装置1は、モータ等の負荷に電力を供給する複数の電力変換部(後述する電力変換部4)を制御するものである。また、電力変換装置1は、上位の制御装置に制御されて上述の制御を行う。この上位の制御装置には、例えば、システム全体を制御する制御装置が該当する。
図2は、第1の実施形態のサブコントローラの構成例を示す図である。同図は、サブコントローラ40の構成例を表すブロック図である。なお、同図には、サブコントローラ40の他にモータ2、電力変換部4及びセンサ部3を記載した。同図の電力変換部4は、モータ2に電力を供給するものである。サブコントローラ40は、この電力変換部4を制御する。
図3は、第1の実施形態のメインコントローラの構成例を示す図である。同図は、メインコントローラ10の構成例を表すブロック図である。同図のメインコントローラ10は、上位通信ポート11と、制御部12と、下位通信ポート13及び14とを備える。
図4は、第1の実施形態の中継コントローラの構成例を示す図である。同図は、中継コントローラ30の構成例を表すブロック図である。同図の中継コントローラ30は、上位通信ポート31と、制御部32と、下位通信ポート33及び34とを備える。
図5Aは、第1の実施形態の通信データの一例を示す図である。同図は、通信路52-54において伝達される通信データ100の一例を表した図である。この通信データ100は、シリアル通信に対応する例を表したものである。通信データ100は、フラグ101と、データ110と、CRC102と、フラグ103とを備える。
図6は、第1の実施形態の通信データの伝達の一例を示す図である。同図は、図1に表したサブコントローラ40からメインコントローラ10への状態量の伝達とメインコントローラ10からサブコントローラ40への状態量指令の伝達とを表した図である。さらに、同図は、中継コントローラ30同士の間での状態量等の伝達の様子を表している。なお、同図には、図1のうちのメインコントローラ10、中継コントローラ30a、30c及び30d並びにサブコントローラ40a-40dを抜粋して記載したものである。
図7Aは、第1の実施形態のメインコントローラの制御方法の一例を示す図である。同図は、図3に示すメインコントローラ10を例に挙げ、その制御方法の一例を表すフローチャートである。まず、メインコントローラ10が制御目標を取得する(ステップS101)。次に、メインコントローラ10が状態量情報を取得する(ステップS102)。これは、下位通信ポート13及び14が受信した状態量情報を取得することにより行うことができる。次に、メインコントローラ10が制御指令を生成する(ステップS103)。次に、メインコントローラ10が生成した制御指令を送出する(ステップS104)。次に、メインコントローラ10は、制御周期の開始まで待機し(ステップS106,No)、制御周期が開始されると(ステップS106,Yes)、ステップS101の処理に移行する。なお、制御周期の開始には、後述するサブコントローラ40の状態量入力開始指令を適用することができる。
[電力変換装置の構成]
図8は、第2の実施形態の電力変換装置の構成例を示す図である。同図は、電力変換装置1のうちの中継部20の最も下の段の中継コントローラ30及びサブコントローラ40の構成例を表す図である。同図の中継コントローラ30は、複数のサブコントローラ40が接続される点で、図1の電力変換装置1と異なる。
図9は、第2の実施形態のサブコントローラの構成例を示す図である。同図は、サブコントローラ40の構成例を表すブロック図である。同図のサブコントローラ40は、下位通信ポート45を更に備える点で図2のサブコントローラ40と異なる。
図10は、第2の実施形態の電力変換装置の他の構成例を示す図である。同図の電力変換装置1は、複数のサブコントローラ40がバス接続される点で、図8の電力変換装置1と異なる。
[中継コントローラの構成]
図11Aは、第3の実施形態の中継コントローラの構成例を示す図である。同図は、中継コントローラ30の構成例を表すブロック図である。第3の実施の形態の中継コントローラ30は、3個以上の下位通信ポート33等を備える点で、図4の中継コントローラ30と異なる。同図の中継コントローラ30は、下位通信ポート33、34、35及び36の4つの下位通信ポートを備える。下位通信ポート33、34、35及び36は、通信路54を介して他の中継コントローラ30又はサブコントローラ40に接続される。
ij-1<n≦ij (1)
これは、中継コントローラ30のみがツリー接続される場合を想定したものであり、メインコントローラ10には下位通信ポート13等の何れかに中継部20の最上段の中継コントローラ30が接続されることとなる。この場合、メインコントローラ10は、1つの下位通信ポート13を備える構成にすることもできる。この場合、例えば下位通信ポート13に接続された1つの中継コントローラ30で状態量の総和を生成し、メインコントローラ10に対して中継コントローラ30の上位通信ポート31から送出する。
図11Bは、第3の実施形態のメインコントローラの構成例を示す図である。同図は、メインコントローラ10の構成例を表すブロック図である。第3の実施の形態のメインコントローラ10は、3以上の下位通信ポート13等を備える点で、図3の中継コントローラ30と異なる。同図のメインコントローラ10は、図11Aの中継コントローラ30と同様に、下位通信ポート13、14、15及び16の4つの下位通信ポートを備える。これらの下位通信ポート13等は、通信路52を介して中継コントローラ30に接続される。
2 モータ
3 センサ部
4 電力変換部
10 メインコントローラ
11、31、41 上位通信ポート
12、32、42 制御部
13、14、33、34、45 下位通信ポート
20 中継部
30、30a、30b、30c、30d、30e、30f 中継コントローラ
40、40a、40b、40c、40d、40e、40f、40g、40h、40i、40j、40k、40l、40m、40n サブコントローラ
43 駆動部
44 電流検出部
51、52、52a、52b、53a、53b、54a、54b、55a、55b、55c、55d 通信路
56a、56b バス
Claims (13)
- 負荷に対し電力を受給する複数の電力変換部毎の状態量に関する状態量情報に基づいて前記複数の電力変換部が行う電力変換を制御するための目標値である制御指令を生成して出力するメインコントローラと、
前記電力変換部毎に配置されて前記制御指令に基づいて前記電力変換部を制御するとともに前記状態量を取得して出力する複数のサブコントローラと、
前記複数のサブコントローラが出力した前記状態量を情報圧縮して前記状態量情報を生成し、前記メインコントローラの側へ前記状態量情報を伝達する中継部と
を備えることを特徴とする電力変換装置。 - 前記中継部は複数の中継コントローラを有すること
を特徴とする請求項1に記載の電力変換装置。 - 前記中継コントローラは複数の段にツリー接続されること
を特徴とする請求項2に記載の電力変換装置。 - 前記メインコントローラは、
前記複数の電力変換部の状態量の総和に基づいて前記制御指令を生成し、
前記状態量情報は、
2台以上の前記サブコントローラが出力する状態量の和であること
を特徴とする請求項1乃至3の何れか1つに記載の電力変換装置。 - 前記サブコントローラにおける状態量の取得はアナログ量で検出された前記状態量をデジタル量に変換して取得することを含むこと
を特徴とする請求項1に記載の電力変換装置。 - 前記中継コントローラは、
前記メインコントローラの側に接続される通信路である上位通信路に接続される上位通信ポートと前記サブコントローラの側に接続される通信路である下位通信路に接続される複数の下位通信ポートとを有すること
を特徴とする請求項2又は3に記載の電力変換装置。 - 複数の前記サブコントローラは、
前記中継コントローラと直列に接続されること
を特徴とする請求項6に記載の電力変換装置。 - 複数の前記中継コントローラは、
j段にツリー接続されて各々1個の上位通信ポートとi個の下位通信ポートとを有し、
前記複数のサブコントローラは、
n個のグループに分けてまとめられ、
前記グループの個数nが
ij-1<n≦ij
を満たすこと
を特徴とする請求項7に記載の電力変換装置。 - 前記メインコントローラは、
前記i個の下位通信ポートを有して前記複数の中継コントローラとともに前記j段にツリー接続されること
を特徴とする請求項8に記載の電力変換装置。 - 前記中継部は、
前記メインコントローラ及び前記サブコントローラとシリアル通信接続されること
を特徴とする請求項1に記載の電力変換装置。 - 前記メインコントローラは、
一つの制御指令を生成し出力すること
を特徴とする請求項1に記載の電力変換装置。 - 前記複数のサブコントローラは、
自身の情報であるステータスを更に出力し、
前記中継部は、
前記複数のサブコントローラが出力したステータスを集約したステータスの前記メインコントローラの側への伝達を更に行うこと
を特徴とする請求項1に記載の電力変換装置。 - 負荷に対し電力を受給する複数の電力変換部毎の状態量に関する状態量情報を使用して前記複数の電力変換部が行う電力変換を制御するための目標値である制御指令を生成して出力することと、
前記電力変換部毎の前記制御指令に基づいて前記電力変換部を制御するとともに前記状態量を取得して出力することと、
前記出力された複数の前記状態量を情報圧縮して前記状態量情報を生成し、前記制御指令の生成に使用させることと
を含むことを特徴とする電力変換装置の制御方法。
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WO2014025734A2 (en) * | 2012-08-09 | 2014-02-13 | Danfoss Power Electronics A/S | Modular inverter drive |
JP2015130746A (ja) * | 2014-01-07 | 2015-07-16 | 株式会社日立製作所 | 電力変換装置およびその制御方法 |
JP6755436B1 (ja) * | 2019-12-17 | 2020-09-16 | 三菱電機株式会社 | 電力変換システム |
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- 2021-03-23 US US18/551,127 patent/US20240162799A1/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014025734A2 (en) * | 2012-08-09 | 2014-02-13 | Danfoss Power Electronics A/S | Modular inverter drive |
JP2015130746A (ja) * | 2014-01-07 | 2015-07-16 | 株式会社日立製作所 | 電力変換装置およびその制御方法 |
JP6755436B1 (ja) * | 2019-12-17 | 2020-09-16 | 三菱電機株式会社 | 電力変換システム |
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CN116998105A (zh) | 2023-11-03 |
US20240162799A1 (en) | 2024-05-16 |
JPWO2022201328A1 (ja) | 2022-09-29 |
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