WO2018168656A1 - Dispositif de conversion de puissance - Google Patents

Dispositif de conversion de puissance Download PDF

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Publication number
WO2018168656A1
WO2018168656A1 PCT/JP2018/009055 JP2018009055W WO2018168656A1 WO 2018168656 A1 WO2018168656 A1 WO 2018168656A1 JP 2018009055 W JP2018009055 W JP 2018009055W WO 2018168656 A1 WO2018168656 A1 WO 2018168656A1
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WO
WIPO (PCT)
Prior art keywords
power conversion
unit
outputs
control unit
current
Prior art date
Application number
PCT/JP2018/009055
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English (en)
Japanese (ja)
Inventor
裕太 岩瀬
小林　洋平
義行 田口
Original Assignee
株式会社日立産機システム
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社日立産機システム filed Critical 株式会社日立産機システム
Publication of WO2018168656A1 publication Critical patent/WO2018168656A1/fr

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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
    • 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

Definitions

  • the present invention relates to a power conversion device that controls an electric motor, and more particularly to a power conversion device that detects the presence or absence of connection between the electric motor and the power conversion device.
  • Patent Document 1 discloses a technique for detecting an unconnected state without detecting a magnetic pole position when a synchronous motor is started.
  • Patent Document 1 is a positioning mode in which a DC current that gradually increases is passed through a predetermined current path by an armature winding of a synchronous motor by a power converter when starting the synchronous motor, and a positioning mode.
  • a control method for a permanent magnet synchronous motor that sets a synchronous operation mode in which an alternating current of variable voltage and variable frequency is supplied to the armature winding, and when in the positioning mode, the armature winding of the permanent magnet synchronous motor Since the current value flowing through the line is detected, and the current value is preset and below the threshold value, it is determined that the synchronous motor is not connected to the power converter, and an alarm is generated.
  • the connection between the synchronous motor and the power converter is detected by detecting the presence or absence of current flowing through the synchronous motor. It is characterized in that it is possible to detect the.
  • the power conversion device includes a power conversion unit having a rectifier and a switching circuit, and a control unit that controls the switching circuit, and the control unit uses the information from the power conversion unit to A current reproduction unit that calculates the current value flowing in each phase of the motor and outputs a three-phase current value, and a speed control that outputs a PWM control command by comparing the speed command input from the outside with the three-phase current value
  • a current reproduction unit that calculates the current value flowing in each phase of the motor and outputs a three-phase current value
  • a speed control that outputs a PWM control command by comparing the speed command input from the outside with the three-phase current value
  • the absolute value of the current value of the current control unit and the PWM control unit that outputs a switching signal to the switching circuit based on a command from the speed control unit, and within a predetermined determination time
  • an unconnected determination unit that outputs an error, and the determination time is a time after the increase time has elapsed from when power is supplied to the power
  • FIG. 1 shows an overall configuration in which the power conversion device 100 of the present embodiment, the electric motor 6, and the AC power source 1 are connected.
  • the power conversion device 100 controls the ON / OFF of the power conversion unit 110 including the rectifier 2, the smoothing capacitor 3, the current detector 5, and the switching circuit 4, and the switching elements (for example, transistors) in the switching circuit to perform the switching operation. It is comprised from the control part 120 to be made.
  • the current input from the external AC power supply 1 to the power conversion unit 110 is converted into a DC current by the rectifier 2 and the smoothing capacitor 3 and supplied to the switching circuit 4 as a DC current.
  • the switching circuit 4 performs a switching operation, a current flows through the stator winding of the electric motor 6 to generate a rotating magnetic field, whereby the rotor of the electric motor 6 rotates.
  • the control unit 120 includes a storage unit 11 that stores an external speed command and the like, a speed control unit 10 that compares the speed command with a current value in the power conversion unit and outputs a PWM control command, and receives and receives a PWM control command and performs switching. Based on the current values detected by the PWM control unit 14, the cutoff unit 12, the unconnected determination unit 13, and the current detector 5 that output a switching signal for performing the switching operation of the circuit, the current value of each phase of the electric motor 6 is determined. A current reproduction unit 15 to be calculated is included. In this embodiment, a shunt resistor provided between the smoothing capacitor 3 and the switching circuit 4 is used as the current detector 5.
  • the speed command 8 input from the outside is once stored in the storage unit 11.
  • the speed control unit 10 outputs a PWM control command for rotating the electric motor 6 so that the current value obtained from the current reproduction unit 15 approaches the current value corresponding to the speed command 8 stored in the storage unit 11.
  • the PWM control command is transmitted to the PWM control unit 14 via the blocking unit 12.
  • the PWM control unit 14 outputs a switching signal for turning on / off each switching element in the switching circuit 4 based on the PWM control command, thereby converting the current flowing through the power conversion unit 110 into a desired magnitude and frequency. To do.
  • the current reproduction unit 15 transmits the calculated current value to the speed control unit 10 and also to the unconnected determination unit 13.
  • the unconnected determination unit 13 receives a current value from the current reproduction unit 15 during a predetermined determination time and compares it with the threshold value of each phase stored in the storage unit 11. When there is even one phase whose absolute value of current is lower than the threshold value, it is determined that the phase is disconnected (or short-circuited due to dielectric breakdown inside the motor), and a motor non-connection signal is transmitted to the cutoff unit 12 Then, an error signal is transmitted to a user interface such as an operation panel. The operation panel that has received the error signal displays that the motor is stopped because it is determined that the motor is not connected.
  • the blocking unit 12 that has received the motor non-connection signal blocks the signal from the speed control unit 10 to the PMW control unit 14.
  • the motor non-connection determination unit 13 determines that each phase is normally connected, and the blocking unit 12, the operation panel, etc. The signal to is not output.
  • FIG. 2 shows the relationship between the current value calculated by the current reproduction unit 15 and time.
  • Three lines in the figure indicate current values of the U phase, the V phase, and the W phase, respectively, and a threshold is set for each phase. This threshold value is stored in the storage unit 11.
  • the magnetic pole positioning operation is first performed. Thereafter, the speed is increased to a constant rotational speed by an acceleration operation, and a rotational speed control based on an external speed command is possible.
  • the current value of each phase is raised to the target value, and control is performed to keep the current constant so that the current value becomes stable.
  • the rotor follows the rotating magnetic field of the stator and waits for the magnetic pole position to be determined.
  • the target value is reached when the increase time 16 has elapsed, but current pulsation occurs in the current value.
  • the degree of pulsation varies depending on the load condition, the size of the target value, and the length of the increase time 16, but as time passes, the pulsation attenuates and the current value becomes stable.
  • One of the features of the present invention is that the time until the stabilization after the increase time is called the stabilization time 17 and the unconnected determination is performed at this time.
  • the current value may fall below the threshold for determination.
  • each phase of the electric motor 6 is correctly connected.
  • a stabilization time 17 is provided between the increase time and the start of the acceleration operation, and further, an unconnected determination process is performed in the latter half of the stabilization time 17, so that an error occurs regardless of the load status.
  • the risk of determination can be further reduced. That is, it is possible to provide a power conversion device with improved determination accuracy.
  • the lengths of the increase time 16, the stabilization time 17, the determination standby time 18 until the unconnected determination is started, and the determination time 19 for performing the determination process are set in advance and stored in the storage unit 11 via the operation device 7.
  • the number of determinations such as how many times the determination process is performed within the determination time 19, the target value of the current of each phase, and the threshold value are also stored in the storage unit.
  • the determination time 19 is set to 1/2 after the stabilization time 17, but it may be set to 2/3, 1/4, or the like.
  • the increase time / stable time required varies depending on the device configuration and load application, and varies depending on the signal processing capability of the CPU constituting the circuit. At least the determination time 19 should be the same as or shorter than the stabilization time 17. If the determination time 19 is shorter, the determination start time may be a time later than the start time of the stabilization time 17.
  • an increase time and a stabilization time are provided during the positioning operation, and the non-connection determination is performed after the pulsation is attenuated, so that the determination can be performed with high accuracy regardless of the load state.
  • FIG. 3 shows a configuration diagram of the power conversion apparatus of the present embodiment.
  • the position where the current detector 5 is provided is different from that of the first embodiment. Even if the current detector is provided at the position of the present embodiment, if the current value of the remaining two phases among the three phases is known, the current value of the remaining one phase can be calculated. Current value can be calculated.
  • FIG. 4 shows a configuration diagram of the power conversion apparatus of the present embodiment.
  • the unconnected determination unit 13 transmits an unconnected flag to the speed control unit 10, and the speed control unit 10 changes the PWM speed command to be transmitted after receiving the flag to 0 and outputs it to the PWM control unit 14. .

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Inverter Devices (AREA)

Abstract

La présente invention a pour but de fournir un dispositif de conversion de puissance qui permet une détection de haute précision d'une absence de connexion entre le dispositif de conversion de puissance électrique et un moteur électrique indépendamment d'un état de charge. À cet effet, la présente invention réalise un dispositif de conversion de puissance comprenant une unité de conversion de puissance dotée d'un redresseur et d'un circuit de commutation, et une unité de commande destinée à commander le circuit de commutation, l'unité de commande ayant une unité de reproduction de courant qui calcule des valeurs de courants circulant dans chaque phase d'un moteur électrique à l'aide d'informations provenant de l'unité de conversion de puissance, et délivre des valeurs de courant triphasé, une unité de commande de vitesse qui compare une instruction de vitesse d'entrée externe avec les valeurs de courant triphasé et délivre une instruction de commande PWM, une unité de commande PWM qui délivre un signal de commutation au circuit de commutation sur la base de l'instruction provenant de l'unité de commande de vitesse, et une unité de détermination de non-connexion qui délivre une erreur lorsque les valeurs absolues des valeurs de courant de l'unité de reproduction de courant chutent en dessous d'une valeur de seuil prédéterminée au cours d'une période de détermination prédéterminée, la période de détermination étant définie comme une période après l'écoulement d'une durée d'augmentation lorsque la puissance est entrée dans l'unité de conversion de puissance et avant qu'une opération de positionnement ne soit terminée.
PCT/JP2018/009055 2017-03-14 2018-03-08 Dispositif de conversion de puissance WO2018168656A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-047988 2017-03-14
JP2017047988A JP2020078096A (ja) 2017-03-14 2017-03-14 電力変換装置

Publications (1)

Publication Number Publication Date
WO2018168656A1 true WO2018168656A1 (fr) 2018-09-20

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JP (1) JP2020078096A (fr)
WO (1) WO2018168656A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009136129A (ja) * 2007-11-06 2009-06-18 Panasonic Corp インバータ装置
JP2013106424A (ja) * 2011-11-14 2013-05-30 Hitachi Ltd モータ制御装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009136129A (ja) * 2007-11-06 2009-06-18 Panasonic Corp インバータ装置
JP2013106424A (ja) * 2011-11-14 2013-05-30 Hitachi Ltd モータ制御装置

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