WO2016063724A1 - Dispositif de conversion de puissance triphasee a blocage de point neutre - Google Patents

Dispositif de conversion de puissance triphasee a blocage de point neutre Download PDF

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Publication number
WO2016063724A1
WO2016063724A1 PCT/JP2015/078447 JP2015078447W WO2016063724A1 WO 2016063724 A1 WO2016063724 A1 WO 2016063724A1 JP 2015078447 W JP2015078447 W JP 2015078447W WO 2016063724 A1 WO2016063724 A1 WO 2016063724A1
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WO
WIPO (PCT)
Prior art keywords
phase
command value
neutral point
voltage command
value
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PCT/JP2015/078447
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English (en)
Japanese (ja)
Inventor
賢司 小堀
鎮教 濱田
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株式会社明電舎
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Publication of WO2016063724A1 publication Critical patent/WO2016063724A1/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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc 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
    • 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
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters

Definitions

  • the present invention relates to a three-phase neutral point clamp type multi-level power converter, and more particularly to neutral point voltage control using PWM control.
  • FIG. 7 is a configuration diagram showing a main circuit in a three-phase neutral point clamp type power converter connected to a motor load.
  • the switching devices IGBT in FIG. 7
  • the switching devices S1 to S12 are turned ON / OFF, and an AC voltage is output to the output terminals U, V, and W.
  • This power converter divides the DC voltage PN between the smoothing capacitors Cdc1 and Cdc2, and outputs three-level potentials of the DC potentials P and N and the neutral point potential NP using PWM modulation (Pulse Width Modulation). Is.
  • neutral point potential control (Neutral Point Control) is performed to suppress variations in DC voltages Vdc1 and Vdc2.
  • the neutral point potential control takes a deviation between the DC voltage Vdc1 of the smoothing capacitor Cdc1 on the positive electrode side (P side) between the DC voltages PN and the DC voltage Vdc2 of the smoothing capacitor Cdc2 on the negative electrode side (N side). Is controlled so that becomes zero.
  • FIG. 8 is a block diagram showing a control circuit of a three-phase neutral point clamp type power converter.
  • the phase detector enc is attached to the motor M, and the phase detection value is theta_det.
  • three-phase currents (motor currents) Iu, Iv, and Iw are three-phase to two-phase converted based on the phase detection value theta_det, and a d-axis current detection value Id_det and a q-axis current detection value Iq_det are obtained. obtain.
  • the d-axis current command value Id_cmd and the q-axis current command value Iq_cmd are set as target values, and PI control is performed so that the d-axis current detection values Id_det and Iq_det follow the target values.
  • the output of the current control unit ACR becomes the two-phase voltage command values Vd_cmd and Vq_cmd.
  • the two-phase voltage command values Vd_cmd and Vq_cmd are subjected to two-phase / three-phase conversion by the two-phase / three-phase converter 2 to generate a three-phase voltage command value V_cmd.
  • the neutral point potential control unit NPC calculates a neutral point potential compensation amount V_cmp based on the DC voltages Vdc1 and Vdc2.
  • the neutral point potential compensation amount V_cmp is added to the three-phase voltage command value V_cmd, and the voltage command after the addition is set as a correction voltage command value V_cmd ′.
  • the correction voltage command value V_cmd ′ is limited by the limiter LMT, and the limit processing voltage command value V_cmd ′′ is input to the PWM processing unit PWM.
  • the limiter LMT outputs the correction voltage command value as it is as the limit processing voltage command value V_cmd ′′ when the correction voltage command value V_cmd ′ is below the threshold value, and sets the threshold value when the correction voltage command value V_cmd ′ is equal to or greater than the threshold value. Output as limit processing voltage command value V_cmd ′′.
  • the purpose of providing the limiter LMT is to prevent the gate commands GI_H and GI_L, which will be described later, from becoming abnormal pulses (minimum pulses, etc.) and to prevent distortion in the output voltage and output current of the power converter. .
  • the PWM processing unit PWM generates the gate commands GI_H and GI_L of the switching devices S1 to S12 using the limit processing voltage command value Vcmd ′′.
  • a method of generating the gate commands GI_H and GI_L by comparing the triangular wave carrier signal and the limit processing voltage command value V_cmd ′′ is general.
  • the corrected voltage command value V_cmp ′ is a value obtained by adding the neutral point potential compensation amount V_cmp to the three-phase voltage command value V_cmd.
  • a large output current of the power converter that is, motor current
  • the output of the current control unit ACR is two-phase.
  • the three-phase voltage command value V_cmd after the three-phase conversion also increases.
  • the capacitor capacities of the smoothing capacitors Cdc1 and Cdc2 in FIG. 7 are generally equal, the deviation of the initial charge value, that is, the deviation between the DC voltages Vdc1 and Vdc2 becomes large due to manufacturing variations and aging degradation. That is, the neutral point potential compensation amount V_cmp immediately after startup tends to increase.
  • the gain of the current control or neutral point voltage control is lowered.
  • the steady-state control performance decreases. Therefore, a control mechanism that takes into account the interference between current control and neutral point potential control without reducing the gain of neutral point potential control is required.
  • One aspect of the present invention is a three-phase neutral point clamp type power converter, and its control circuit includes a d-axis current command value and d
  • a current control unit that calculates a two-phase voltage command value by a current control function that performs PI control based on a deviation from the detected shaft current value and a deviation between the q-axis current command value and the q-axis current detected value;
  • a two-phase three-phase conversion unit that converts a phase voltage command value into a three-phase voltage command value, a neutral point potential control unit that calculates a neutral point potential compensation amount that compensates for a voltage deviation of a smoothing capacitor connected in series, Output a value that limits the neutral point potential compensation amount as a limit compensation amount until a preset time has elapsed since the start of operation of the power converter, and after a preset time has elapsed since the start of the operation of the power converter The neutral point potential compensation amount is output as it
  • a limiter that outputs the threshold value as a limit processing voltage command value when the correction voltage command value is equal to or greater than the threshold value, and a PWM control unit that performs PWM control based on the limit treatment voltage command value.
  • the limiting means sets the limit compensation amount to 0 until a preset time elapses after the power converter starts operation.
  • the limiting means sets the limit compensation amount to 0 until the power conversion device starts operation, and the limit compensation amount until a preset time elapses after the power conversion device starts operation. Is gradually increased.
  • the load connected to the three-phase AC output of the power converter is a motor
  • the three-phase current detection value is converted to the d-axis current detection value and the q-axis current detection value based on the phase detection value of the motor
  • the two-phase voltage command value is converted into a three-phase voltage command value based on the phase detection value of the motor.
  • the power conversion device is connected to a grid, and converts a three-phase current detection value into a d-axis current detection value and a q-axis current detection value based on a detection value of the system phase.
  • the two-phase voltage command value is converted into a three-phase voltage command value based on the phase detection value.
  • FIG. 2 is a block diagram illustrating a control circuit according to the first embodiment.
  • FIG. 4 is a block diagram illustrating a control circuit in a second embodiment.
  • 9 is a time chart showing an input / output operation of a variable limiter according to the second embodiment.
  • FIG. 9 is a block diagram illustrating a control circuit according to a third embodiment.
  • FIG. 9 is a block diagram illustrating a control circuit according to a fourth embodiment.
  • the block diagram which shows an example of the conventional control circuit.
  • Embodiments 1 to 4 of the three-phase neutral point clamp type multilevel power conversion device according to the present invention will be described below in detail with reference to FIGS.
  • FIG. 1 is a block diagram illustrating a control circuit of the power conversion device according to the first embodiment.
  • the control circuit of the first embodiment takes into account interference between current control and neutral point potential control.
  • the neutral point potential compensation amount V_cmp output by the neutral point potential control unit NPC is limited until the preset time elapses from the start of operation of the power converter.
  • the delay is limited by the delay counter 4).
  • the delay counter 4 is triggered by a signal at the start of operation of the power conversion device (hereinafter referred to as an operation start signal) Start trigger, and the limit compensation amount until the time constant ⁇ elapses after the operation start signal Start trigger is input.
  • 0 is output as V_cmp_o
  • the neutral point potential compensation amount V_cmp is output as the limit compensation amount V_cmp_o after the time constant ⁇ elapses after the operation start signal Start trigger is input.
  • the time constant ⁇ is calculated based on the d-axis inductance Ld, the q-axis inductance Lq, and the resistance R of the connected motor M.
  • the values of the d-axis inductance Ld, the q-axis inductance Lq, and the resistance R are determined in advance by an impedance measurement test of the motor M or the like.
  • V_cmd ′ V_cmd.
  • V_cmd ′ V_cmd.
  • V_cmp V_cmd + V_cmp.
  • the correction voltage command value V_cmd ′ is neutral during the period from the start of operation of the power conversion device (that is, at the time of motor start) to the time constant ⁇ . It operates only with the three-phase voltage command value V_cmd calculated by the current control without being affected by the potential compensation amount V_cmd. Therefore, current control and neutral point potential control do not interfere, and the output voltage of the power converter operates stably. As a result, a failure stop due to overcurrent protection or overvoltage protection does not occur. Further, since the gains of the current control and neutral point potential control are not lowered in the steady state, it is possible to suppress the deterioration of the control performance in the steady state.
  • the limit compensation amount V_cmp_o is made variable according to the passage of time using the operation start signal Start trigger as a trigger. Others are the same as in the first embodiment.
  • variable limiter 5 is provided instead of the delay counter 4, and an operation start signal Start trigger of the power conversion device and a neutral point potential compensation amount V_cmp are input.
  • variable limiter 5 does not add the compensation amount step by step, but outputs 0 as the limit compensation amount V_cmp_o until the operation start signal Start trigger is input, and the operation start signal Start trigger is input as shown in FIG.
  • the limit compensation amount V_cmp_o is gradually increased in a cushioned manner until the time constant ⁇ , and the neutral point potential compensation amount is set as the limit compensation amount V_cmp_o after the time constant ⁇ elapses after the operation start signal Start trigger is input.
  • V_cmp is output as it is.
  • the limit compensation amount V_cmp_o can be reduced during the period from the start of operation of the power conversion device (that is, when the motor is started) to the time constant ⁇ , interference between current control and neutral point potential control can occur. It becomes small and it becomes possible to stabilize the output voltage of a power converter device. Further, since the neutral point potential compensation amount V_cmp is output as it is as the limit compensation amount V_cmp_0 and the gain is not lowered at the steady state, it is possible to suppress the deterioration of the control performance at the steady state.
  • FIG. 4 shows a main circuit configuration diagram of a three-phase neutral point clamp type power conversion device interconnected with the grid. Input filters Lf and Cf are inserted between the three-phase system voltages Vrs, Vst and Vtr and the three-phase neutral point clamp type power converter.
  • FIG. 5 shows a block diagram of the DC voltage control and current control block of FIG. 4 and 5, the system voltages Vrs, Vst, and Vtr are measured, and the system phase pll_out is obtained using a PLL (Phase Locked Loop) circuit.
  • PLL Phase Locked Loop
  • the three-phase two-phase converter 1 converts the three-phase current detection values (system currents) Ir, Is, It into the d-axis current detection value Id_det and the q-axis current detection value Iq_det based on the system phase pll_out. Is converted to Further, the two-phase three-phase converter 2 converts the two-phase voltage command values Vd_cmd and Vq_cmd into the three-phase voltage command value V_cmd based on the system phase pll_out.
  • Vdc_cmd command for the voltage between PN terminals in FIG. 4
  • AVR voltage control: Automatic Voltage Regulator
  • the correction voltage command value V_cmd ′ reaches the threshold value by adding the compensation amounts of the current control and neutral point potential control during the boosting operation at the start of operation of the power converter, and the limit processing voltage command value V_cmd ′. Since 'is easily restricted, a delay counter 4 is provided. The delay counter 4 calculates a time constant ⁇ based on the input filter inductance Lf and the capacitor Cf. The limit compensation amount V_vmp_o is set to 0 until the time constant ⁇ elapses after the operation start signal Start trigger is input. After the time constant ⁇ has elapsed after the operation start signal Start trigger is input, the limit compensation amount V_cmp_o is medium. By outputting the neutral point potential compensation amount V_cmp as it is, current control and neutral point potential control are made non-interfering, and stable control characteristics can be obtained. As a result, the system currents Ir, Is, It are stabilized.
  • the control circuit of the third embodiment is provided with a variable limiter 5 instead of the delay counter 4 as in the second embodiment.
  • FIG. 6 shows a control circuit according to the fourth embodiment.
  • variable limiter 5 may be performed in the same manner as in the second embodiment.
  • the limit compensation amount V_cmp_o can be reduced at the start of operation of the power converter, and the neutral point potential compensation amount V_cmp can be used as the limit compensation amount V_cmp_o in the steady state. Can be output as they are, so that the interference between the current control and the neutral point potential control is reduced without degrading the control performance in the steady state, and stable control characteristics can be obtained. As a result, the alternating currents Ir, Is, It are stabilized.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Rectifiers (AREA)

Abstract

La présente invention concerne une unité de commande de courant AVR, dans laquelle une commande PI est exécutée; et des valeurs de commande de tension Vd_cmd, Vq_cmd sont calculées, sur la base de l'écart entre une valeur de commande de courant d'axe d Id_cmd et une valeur de détection de courant d'axe d Id_det et l'écart entre une valeur de commande de courant d'axe q Iq_cmd et une valeur de détection de courant d'axe q Iq_det. En outre, une unité de commande de potentiel de point neutre (NPC) calcule une quantité de compensation de potentiel de point neutre V_cmp pour compenser l'écart de la tension de condensateurs de filtrage qui sont connectés en série. Dans un moyen de limitation (4), la quantité de compensation de potentiel de point neutre V_cmp est limitée à partir de l'instant de début de l'opération jusqu'à l'écoulement d'une quantité prédéterminée de temps. Dans un additionneur (3), la quantité de compensation de potentiel de point neutre limitée V_cmp et la valeur de commande de tension Vd_cmd sont additionnées, et une valeur de commande de tension de compensation V_cmd' est calculée. Sur la base de la valeur de commande de tension de compensation V_cmd ', une commande de modulation de largeur d'impulsions est effectuée par une unité de commande de modulation de largeur d'impulsions PWM. Grâce à cette configuration, dans un dispositif de conversion de puissance triphasée à blocage de point neutre dans lequel une commande de modulation de largeur d'impulsions est effectuée, l'interférence entre la commande de courant et la commande de potentiel de point neutre est supprimée.
PCT/JP2015/078447 2014-10-20 2015-10-07 Dispositif de conversion de puissance triphasee a blocage de point neutre WO2016063724A1 (fr)

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JP2014213280A JP2016082761A (ja) 2014-10-20 2014-10-20 三相中性点クランプ式の電力変換装置
JP2014-213280 2014-10-20

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01298959A (ja) * 1988-05-27 1989-12-01 Mitsubishi Electric Corp Ｐｗｍコンバータ装置
JPH09172783A (ja) * 1995-12-19 1997-06-30 Toshiba Corp Ｎｐｃインバータ装置
JPH09191656A (ja) * 1996-01-09 1997-07-22 Hitachi Ltd 多レベル電力変換装置
JP2003111433A (ja) * 2001-09-27 2003-04-11 Mitsubishi Electric Corp 中性点クランプ式３レベルインバータ装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01298959A (ja) * 1988-05-27 1989-12-01 Mitsubishi Electric Corp Ｐｗｍコンバータ装置
JPH09172783A (ja) * 1995-12-19 1997-06-30 Toshiba Corp Ｎｐｃインバータ装置
JPH09191656A (ja) * 1996-01-09 1997-07-22 Hitachi Ltd 多レベル電力変換装置
JP2003111433A (ja) * 2001-09-27 2003-04-11 Mitsubishi Electric Corp 中性点クランプ式３レベルインバータ装置

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