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WO2018127960A1 - Dispositif de conversion d'énergie - Google Patents

Dispositif de conversion d'énergie Download PDF

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Publication number
WO2018127960A1
WO2018127960A1 PCT/JP2017/000176 JP2017000176W WO2018127960A1 WO 2018127960 A1 WO2018127960 A1 WO 2018127960A1 JP 2017000176 W JP2017000176 W JP 2017000176W WO 2018127960 A1 WO2018127960 A1 WO 2018127960A1
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WO
WIPO (PCT)
Prior art keywords
voltage
phase
norm
voltage command
threshold value
Prior art date
Application number
PCT/JP2017/000176
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English (en)
Japanese (ja)
Inventor
雄作 小沼
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
Priority to PCT/JP2017/000176 priority Critical patent/WO2018127960A1/fr
Priority to JP2018560290A priority patent/JP6731499B2/ja
Publication of WO2018127960A1 publication Critical patent/WO2018127960A1/fr

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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
    • H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC
    • H02M5/42—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters
    • H02M5/44—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC
    • H02M5/443—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/45—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only

Definitions

  • the present invention relates to a power conversion device.
  • a power conversion device that creates an AC voltage of a predetermined frequency from the DC voltage is used.
  • an overvoltage is generated due to regenerative energy during deceleration, and an operation occurs when an excessive overvoltage occurs. Will stop.
  • Patent Document 1 Japanese Patent Laid-Open No. 10-66385 (Patent Document 1) is known as background art in this technical field for preventing overvoltage.
  • Patent Document 1 “to provide a control device for an inverter that automatically decelerates while suppressing overvoltage and overcurrent stably without depending on constants such as the resistance of an induction motor and the inertia moment value of a mechanical load”.
  • providing means for detecting the output current and output voltage of the inverter and means for detecting the DC voltage of the smoothing capacitor connected to the DC side of the inverter, the DC voltage of the smoothing capacitor and the output current of the inverter are provided. The speed reduction rate during the deceleration operation of the inverter is calculated and controlled from the detected value of the output voltage. ”Technology is described (see summary).
  • Patent Document 1 describes an inverter control device that suppresses overvoltage.
  • the invention of Patent Document 1 is limited to deceleration operation, and no effect can be obtained during acceleration operation or constant speed operation. Further, during the deceleration operation, the set deceleration rate is automatically corrected, and the vehicle cannot be decelerated at a desired deceleration rate.
  • an object of the present invention is to provide a power converter that can suppress overvoltage even during acceleration operation or constant speed operation, and can decelerate at a desired deceleration rate during deceleration operation.
  • one of the representative inventions is A voltage converter that converts a DC voltage into a voltage based on a voltage command; A voltage detector for detecting the DC voltage; A phase controller for controlling the phase of the voltage command; A power conversion device comprising: The phase controller may change the phase of the voltage command when the detected DC voltage exceeds a first threshold value.
  • the present invention it is possible to provide a power conversion device that can suppress overvoltage even during acceleration operation or constant speed operation and can decelerate at a desired deceleration rate during deceleration operation.
  • FIG. 1 It is a figure which shows an example of the power converter device of Example 1.
  • FIG. It is a figure explaining an example of operation
  • FIG. It is a figure explaining an example of operation
  • FIG. It is a figure which shows an example of the power converter device of Example 2.
  • FIG. It is a figure which shows an example of the power converter device of Example 3.
  • FIG. 1 shows an example of a power conversion apparatus according to Embodiment 1 of the present invention.
  • the power converter 101 that controls the driving of the three-phase AC induction motor 100 includes a rectifier circuit 102, a smoothing circuit 103, a voltage detector 104, a voltage converter 105, a norm controller 107, and a phase controller 106.
  • the three-phase AC voltage output from the three-phase AC power supply 108 is rectified by the rectifier circuit 102 and smoothed by the smoothing circuit 103, thereby generating a DC voltage.
  • a single-phase AC voltage may be input to the rectifier circuit 102 from a single-phase AC power source.
  • the rectifier circuit 102 and the smoothing circuit 103 may be removed and a direct current voltage may be obtained directly from a direct current power source.
  • the voltage detector 104 detects the smoothed DC voltage.
  • the voltage conversion unit 105 that converts a DC voltage into a voltage based on the voltage command 109 includes a switching circuit controller 110 and a switching circuit 111.
  • the switching circuit controller 110 generates a switching circuit control signal 112 so that a voltage based on the voltage command 109 is applied to the three-phase AC induction motor 100. For example, the voltage command and the triangular wave signal are compared to generate the switching circuit control signal 112 including a PWM signal.
  • the switching circuit 111 converts the DC voltage into a voltage based on the voltage command 109 by combining ON / OFF of a plurality of switching elements based on the switching circuit control signal 112.
  • the switching circuit can be configured by connecting in parallel U-phase, V-phase, and W-phase arms each having two switching elements connected in series.
  • the above describes a method of converting a DC voltage into a voltage based on the voltage command 109 by a method called PWM for controlling the width of the voltage pulse, but the DC voltage is converted into a voltage by a method called PAM for changing the amplitude of the voltage pulse.
  • PWM pulse width of the voltage pulse
  • PAM pulse amplitude of the voltage pulse
  • phase controller 106 and norm controller 107 that are the features of this embodiment will be described.
  • the phase controller 106 changes the phase of the voltage command based on the detected DC voltage 113 of the voltage detector 104, and outputs the changed voltage command 109 and the phase controlling signal 115.
  • FIG. 2 shows an example of the operation of the phase controller 106.
  • the example of FIG. 2 is an example in which a first threshold value and a second threshold value are provided to provide a hysteresis effect.
  • f is a frequency
  • t time
  • ⁇ 0 is a phase before being changed by the phase controller 106
  • V0 is a norm (voltage) before being changed by the norm controller 107.
  • the detected DC voltage 113 When the detected DC voltage 113 is between the first threshold and the second threshold as at t2, the voltage command of the phase ⁇ 1 is output without changing the phase ⁇ 1.
  • the detected DC voltage exceeds the second threshold at t4, but the phase is ⁇ 0 and does not change from t3 to t5.
  • the hysteresis effect is eliminated, but the first threshold value and the second threshold value may be set to the same value, that is, one threshold value, and the phase may be changed to ⁇ 0 and ⁇ 1 by one threshold value.
  • the threshold value may be set in advance or externally. Further, the threshold value may be changed according to the driving status of the motor, for example, voltage, current, frequency, and the like. The amount of change in phase may be changed according to the difference between the detected DC voltage 113 and the first threshold value.
  • phase of the three-phase AC voltage created by the switching circuit 111 changes.
  • the direction of the change in the phase ⁇ 1 of the voltage command 109 may be, for example, such that the current flowing through the electric motor is increased.
  • phase control in-progress signal 115 is used for status display and control of phase control in progress.
  • the norm controller 107 changes the norm (voltage) of the voltage command based on the detected DC voltage 113 of the voltage detector 104, and outputs the voltage command 114 before phase control and the norm controlling signal 117 as the changed voltage command. Output.
  • FIG. 3 shows an example of the operation of the norm controller. The example of FIG. 3 is an example in which a third threshold value and a fourth threshold value are provided to provide a hysteresis effect.
  • the norm V0 of the pre-norm control voltage command 116 is increased to V1
  • the pre-phase control voltage command 114 which is a voltage command after the norm increase, and the norm control A medium signal 117 is output.
  • the voltage command of the norm V0 is output as it is as at t4.
  • the fourth threshold value set to a value lower than the third threshold value at t3
  • the norm V1 of the pre-norm control voltage command 116 is returned to V0 before the phase control.
  • a voltage command 114 is output.
  • the detected DC voltage 113 is between the third threshold value and the fourth threshold value as at t2
  • the voltage command of the norm V1 is output without changing the norm V1.
  • the detected DC voltage exceeds the second threshold at t4, but the norm is V0 from t3 to t5 and does not change.
  • the third threshold value and the fourth threshold value may be the same value, that is, the threshold value may be one, and the norm may be changed to V0 and V1 by one threshold value.
  • the threshold value may be set in advance or externally. Further, the threshold value may be changed according to the driving status of the motor, for example, voltage, current, frequency, and the like. The increase amount of the norm may be changed according to the difference between the detected DC voltage 113 and the third threshold value.
  • the norm controller 107 may be removed, and the voltage command 116 before norm control may be directly input to the phase controller 106.
  • the norm control in-progress signal 117 is used for status display and control of the norm control in progress.
  • the present invention can be applied without selecting a motor drive control method such as V / f constant control or vector control.
  • the DC voltage increases depending on the degree.
  • the power converter stops output for the purpose of overvoltage protection, but the power converter sets the first threshold to a value lower than the DC voltage at which output is stopped.
  • the DC voltage can be suppressed before the power converter stops the output, and the driving of the electric motor can be continued.
  • the third threshold value is set to a value lower than the first threshold value, it is possible to further suppress an increase in DC voltage by increasing the norm before changing the phase. Note that even if the third threshold value is set to the same value or a larger value as the first threshold value, and the phase is changed before the norm is increased, an increase in the DC voltage can be suppressed.
  • FIG. 4 shows an example of the power conversion apparatus according to the second embodiment of the present invention.
  • a power converter 201 that controls the driving of the three-phase AC induction motor 100 includes a rectifier circuit 102, a smoothing circuit 103, a voltage converter 105, a norm controller 107, a phase controller 106, a current detector 218, and a power calculator 219. Have.
  • the current detector 218 detects the three-phase alternating current output from the power conversion device 201.
  • the current detector 218 may detect a two-phase current and calculate the remaining one-phase current because the sum of the three-phase alternating currents is zero.
  • a resistor may be provided on the positive electrode side or the negative electrode side of the smoothing circuit 103, and the three-phase alternating current may be estimated from the voltage across the resistor.
  • the power calculator 219 calculates power from the voltage command 116 before norm control and the detected current 220.
  • the power may be calculated by at least one of apparent power, active power, and reactive power. Moreover, what is necessary is just to calculate the electric power of at least one phase among three phases. When calculating two or more phases of electric power, you may calculate those average values.
  • the power may be calculated using the voltage command 109 or the voltage command 114 before phase control instead of the voltage command 116 before norm control.
  • phase controller 106 and the norm controller 107 are the same as those of the first embodiment.
  • the phase controller 106 changes the phase of the voltage command based on the calculated power 221 of the power calculator 219, and outputs the changed voltage command 109 and the phase controlling signal 115.
  • the phase of the pre-phase control voltage command 114 is changed to ⁇ 0 when the calculated power 221 exceeds the first threshold value.
  • the voltage command 109 which is the voltage command after the phase change, and the phase control in-progress signal 115 are output.
  • the voltage command with the phase ⁇ 0 is output as it is.
  • the voltage command 109 is output by returning the phase ⁇ 1 of the pre-phase control voltage command 114 to ⁇ 0. .
  • the voltage command of the phase ⁇ 1 is output without changing the phase ⁇ 1.
  • the hysteresis effect disappears, but the first threshold value and the second threshold value may be the same value, that is, the threshold value may be one, and the phase may be changed to ⁇ 0 and ⁇ 1 by one threshold value.
  • the threshold value may be set in advance or externally. Further, the threshold value may be changed according to the driving status of the motor, for example, voltage, current, frequency, and the like. The amount of change in phase may be changed according to the difference between the detected DC voltage 113 and the first threshold value.
  • a threshold value may be provided for each. Further, the threshold value may be compared with either the absolute value of the calculated power 221, only the positive value of the calculated power 221, or only the absolute value of the negative value of the calculated power 221.
  • the norm controller 107 changes the norm (voltage) of the voltage command based on the calculated power 221 of the power calculator 219, and outputs the pre-phase control voltage command 114 and the norm controlling signal 117, which are the changed voltage commands. To do. For example, in the example in which the third threshold value and the fourth threshold value are provided so as to have a hysteresis effect, when the calculated power 221 exceeds the third threshold value, the norm V0 of the pre-norm control voltage command 116 is set. V1 is increased to output a pre-phase control voltage command 114, which is a voltage command after the norm increase, and a norm controlling signal 117.
  • the norm V0 voltage command is output as it is.
  • the pre-phase control voltage command 114 that returns the norm V1 of the pre-norm control voltage command 116 to V0. Is output.
  • the norm V1 voltage command is output without changing the norm V1. In this way, by setting two thresholds so that the norm does not change unless the threshold is exceeded, malfunction due to noise or the like can be prevented by the hysteresis effect.
  • the third threshold value and the fourth threshold value may be the same value, that is, the threshold value may be one, and the norm may be changed to V0 and V1 by one threshold value.
  • the threshold value may be set in advance or externally. Further, the threshold value may be changed according to the driving status of the motor, for example, voltage, current, frequency, and the like. The increase amount of the norm may be changed according to the difference between the calculated power 221 and the third threshold value. When there are a plurality of calculation powers 221, a threshold value may be provided for each.
  • the threshold value may be compared with either the absolute value of the calculated power 221, only the positive value of the calculated power 221, or only the absolute value of the negative value of the calculated power 221.
  • the norm controller 107 may be removed, and the voltage command 116 before norm control may be directly input to the phase controller 106.
  • the present invention can be applied without selecting a motor drive control method such as V / f constant control or vector control.
  • the DC voltage increases depending on the degree, but the power also changes depending on the increase of the DC voltage.
  • the power converter stops output for the purpose of overvoltage protection, but the first threshold is set to a value lower than the power corresponding to the DC voltage at which the power converter stops output.
  • the third threshold value is set to a value lower than the first threshold value, it is possible to further suppress an increase in DC voltage by increasing the norm before changing the phase. Note that even if the third threshold value is set to the same value or a larger value as the first threshold value, and the phase is changed before the norm is increased, an increase in the DC voltage can be suppressed.
  • FIG. 5 shows an example of the power conversion apparatus according to the third embodiment of the present invention.
  • a power factor calculator 319 is provided instead of the power calculator 219, and the phase of the voltage command is changed based on the calculated power factor.
  • the power factor calculator 319 calculates the power factor from the voltage command 116 before norm control and the detected current 220.
  • the power factor may be calculated using the voltage command 109 or the voltage command 114 before phase control instead of the voltage command 116 before norm control.
  • phase controller 106 and norm controller 107 when the power factor exceeds the threshold is the same as that of the second embodiment.
  • the present invention when the power factor calculated by the power factor calculator exceeds the threshold, the voltage command phase is changed, and the voltage phase applied to the motor is changed, thereby suppressing the DC voltage increase. . Therefore, it is possible to suppress the DC voltage without automatically correcting the acceleration rate or the deceleration rate without depending on the driving conditions such as acceleration, constant speed, and deceleration of the motor. Further, since information on the motor such as resistance and inductance is not required, the present invention can be applied without selecting a motor drive control method such as V / f constant control or vector control.
  • the DC voltage increases depending on the degree, but the power factor also changes depending on the increase of the DC voltage.
  • the power converter stops the output for the purpose of overvoltage protection, but the power converter has a first value lower than the power factor corresponding to the DC voltage at which the power converter stops the output.
  • the threshold value By setting the threshold value, the DC voltage can be suppressed before the power converter stops the output, and the driving of the electric motor can be continued.
  • the third threshold value to a value lower than the first threshold value, it is possible to further suppress an increase in DC voltage by increasing the norm before changing the phase. Note that even if the third threshold value is set to the same value or a larger value as the first threshold value, and the phase is changed before the norm is increased, an increase in the DC voltage can be suppressed.
  • this invention is not limited to the above-mentioned Example, Various modifications are included.
  • the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
  • a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
  • each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit.
  • Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor.
  • Information such as programs, tables, and files that realize each function can be stored in a memory, a hard disk, a recording device such as an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.
  • control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ac-Ac Conversion (AREA)
  • Inverter Devices (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

La présente invention concerne un dispositif de conversion d'énergie avec lequel une surtension peut être empêchée pendant une accélération et pendant un fonctionnement à vitesse constante, et une décélération à un taux de décélération souhaité est possible pendant la décélération. Le dispositif de conversion d'énergie est pourvu d'une partie de conversion de tension pour convertir une tension continue en une tension sur la base d'une commande de tension, d'un détecteur de tension pour détecter la tension continue, et d'un contrôleur de phase pour commander la phase de la commande de tension. Le dispositif de conversion d'énergie est caractérisé en ce que lorsque la tension continue détectée dépasse un premier seuil, le contrôleur de phase provoque une modification de la phase de la commande de tension.
PCT/JP2017/000176 2017-01-05 2017-01-05 Dispositif de conversion d'énergie WO2018127960A1 (fr)

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PCT/JP2017/000176 WO2018127960A1 (fr) 2017-01-05 2017-01-05 Dispositif de conversion d'énergie
JP2018560290A JP6731499B2 (ja) 2017-01-05 2017-01-05 電力変換装置

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115039335A (zh) * 2020-05-08 2022-09-09 株式会社日立产机系统 电力转换装置及其控制方法

Citations (6)

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Publication number Priority date Publication date Assignee Title
WO2009119321A1 (fr) * 2008-03-28 2009-10-01 ダイキン工業株式会社 Dispositif de conversion de puissance
JP2013039026A (ja) * 2011-07-29 2013-02-21 General Electric Co <Ge> 過渡事象ライド・スルー能力を伴う電力変換システムおよびその方法
JP2014087166A (ja) * 2012-10-24 2014-05-12 Hitachi Industrial Equipment Systems Co Ltd 欠相検出方法、及び電力変換装置
JP2014100026A (ja) * 2012-11-15 2014-05-29 Toshiba Corp 無効電力補償装置
JP2014189051A (ja) * 2013-03-26 2014-10-06 Kubota Corp シリーズハイブリッドシステム
JP2014212606A (ja) * 2013-04-18 2014-11-13 三菱電機株式会社 電力変換装置

Family Cites Families (1)

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Publication number Priority date Publication date Assignee Title
JP2880808B2 (ja) * 1991-02-05 1999-04-12 株式会社東芝 インバータ装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009119321A1 (fr) * 2008-03-28 2009-10-01 ダイキン工業株式会社 Dispositif de conversion de puissance
JP2013039026A (ja) * 2011-07-29 2013-02-21 General Electric Co <Ge> 過渡事象ライド・スルー能力を伴う電力変換システムおよびその方法
JP2014087166A (ja) * 2012-10-24 2014-05-12 Hitachi Industrial Equipment Systems Co Ltd 欠相検出方法、及び電力変換装置
JP2014100026A (ja) * 2012-11-15 2014-05-29 Toshiba Corp 無効電力補償装置
JP2014189051A (ja) * 2013-03-26 2014-10-06 Kubota Corp シリーズハイブリッドシステム
JP2014212606A (ja) * 2013-04-18 2014-11-13 三菱電機株式会社 電力変換装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115039335A (zh) * 2020-05-08 2022-09-09 株式会社日立产机系统 电力转换装置及其控制方法

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