WO2020009065A1 - Dispositif de commande de sortie pour générateur d'énergie éolienne - Google Patents

Dispositif de commande de sortie pour générateur d'énergie éolienne Download PDF

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Publication number
WO2020009065A1
WO2020009065A1 PCT/JP2019/026125 JP2019026125W WO2020009065A1 WO 2020009065 A1 WO2020009065 A1 WO 2020009065A1 JP 2019026125 W JP2019026125 W JP 2019026125W WO 2020009065 A1 WO2020009065 A1 WO 2020009065A1
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WIPO (PCT)
Prior art keywords
power
generator
input voltage
voltage
output
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Application number
PCT/JP2019/026125
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English (en)
Japanese (ja)
Inventor
広平 小野
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Ntn株式会社
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Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2020009065A1 publication Critical patent/WO2020009065A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • 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
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

Definitions

  • the present invention relates to an output control device of a wind power generator that applies a brake to a windmill when a wind speed becomes too high.
  • FIG. 9 As another type of applying a brake to a windmill, as shown in FIG. 9, there is a type in which heat required for electric braking is consumed by passing electric power of a generator 3 to a resistor 72. In some cases, a step-down circuit 73 is provided before the resistor 72.
  • Each of the above-mentioned brake types of the wind turbine has a problem in that power supplied to the system is lost during the braking operation.
  • power for braking is consumed by the internal resistance of the generator 3 (FIG. 8)
  • a large current flows through the generator 3 and the reliability may be impaired.
  • the power is consumed by the resistor 72 (FIG. 9)
  • a large resistor 72 is required for power consumption, and the cost of the brake system is high.
  • An object of the present invention is to solve the above-described problems, and an object of the present invention is to provide a system in which electric power can be preferentially supplied to a system even during a braking operation of a wind turbine, and a small power absorbing means such as a resistor provided for the braking operation. It is an object of the present invention to provide an output control device of a wind turbine generator capable of performing a wind turbine braking operation with a low-cost configuration.
  • the output control device 4 of the wind power generation device is configured such that when a DC input voltage V1 is applied to a wind power generation device including a wind turbine 1 and a generator 3 that converts rotational energy of the wind turbine 1 into electric energy.
  • the inverter device 5 and the generator when the input voltage V1 is supplied to the system 8 of the AC power is converted into alternating current is higher than the specified voltage V1 0 is having the ability of maintaining the provision of output regardless of the input voltage V1 power
  • a power absorbing means 32 comprising a resistor or a power storage means connected in parallel with the inverter device 5 to the rectifying means 22;
  • the prescribed voltage V2 0 of the input voltage regulating means 31 is higher than the prescribed voltage V1 0 of the in
  • the electric power generated by the generator 3 by the rotation of the wind turbine 1 and converted into DC by the rectifier 22 is input to the inverter device 5, where it is converted into AC that can be supplied to the system 8, Supplied to The inverter device 5, when the input voltage V1 is higher than the specified voltage V1 0 has the property of maintaining the provision of output regardless of the input voltage V1 power generation voltage of the generator 3 by the wind speed is accelerated to some extent When it becomes higher, the specified power is supplied from the inverter device 5 to the system 8. Normally, operation is performed within the range of the generated voltage.
  • the power absorption unit 32 to flow electric power, even while the brake of the wind turbine 1 is performed, since the specified voltage V1 0 of the inverter device 5 is lower than the prescribed voltage V2 0 of the input voltage regulating means 31, line 8 from the inverter device 5 Is supplied with power.
  • the power absorbing means 32 such as a resistor can be smaller than a configuration in which power is consumed only by the power absorbing means 32 during braking, and the wind turbine 1 has a low cost configuration. Brake operation can be performed.
  • the input voltage regulating means 31 to flow electric power to the electric power only absorption means 32 when the input voltage V2 is higher than the prescribed voltage V2 0, also the provision of the inverter device 5 the specified voltage V2 0 to be higher than the voltage V1 0, because it preferentially power during braking is supplied to the inverter device 5, it is possible even during the braking operation the wind turbine 1 keeps the power supply to the grid 8 .
  • the power absorbing means 32 such as a resistor provided for the braking operation can be small, and the braking operation of the wind turbine 1 can be performed with a low-cost configuration.
  • the “inverter device 5” refers to a controller having a function of converting DC to AC, and includes a power conditioner and a battery charge controller. Battery charge controllers are typically used in independent power systems that supply batteries.
  • a power conditioner may be used as the “inverter device 5”.
  • a “power conditioner” refers to a device that converts generated power input by DC into AC power that can be supplied to the system 8.
  • the inverter device 5 such as a power conditioner generally used in the small wind turbine 1 mainly uses a table control method that regulates electric power that can be supplied to the system 8 in accordance with an input voltage. You're going to take a lot of settings. Therefore, characteristics referred to as "when the input voltage V1 is higher than the prescribed voltage V1 0 is maintained defining output regardless of the input voltage V1 power" of the is a characteristic of typical power conditioner has a special The inverter device 5 having a simple configuration is unnecessary.
  • Some commercially available inverter devices supply power to the grid when a specified voltage is supplied instead of a map. The same applies to the protection function of the inverter device. When the power is large, the output power does not change but the input voltage is increased. Therefore, such an inverter device can also be used.
  • a booster circuit 21 that boosts the power rectified by the rectifier 22 and whose output side is connected to the inverter device 5 and the input voltage regulator 31 and that can be turned on and off, and a booster that controls the booster 21 Control means 23,
  • This step-up control means 23 Monitor the wind turbine status value which is one of the rotation speed of the wind turbine 1, the rotation speed of the generator 3, the generated voltage of the generator 3, the generated power of the generator 3, the input energy of the generator, and the wind speed, Brake start condition determination means 29 for detecting that the windmill status value exceeds or has reached a threshold value determined for safety of the operation of the windmill 1 and outputting a brake command, and An output processing unit 28 for causing the boosting circuit 21 to perform a boosting operation may be provided.
  • the wind speed is increased to an unfavorable level in terms of safety of the wind turbine 1, and the rotation speed of the wind turbine 1, the rotation speed of the generator 3, the generated voltage of the generator 3, the generated power of the generator 3, the generator
  • the brake start condition determining means 29 issues a brake command, and in response, the output processing means causes the booster circuit 21 to start the boosting operation.
  • the brake is applied to the wind turbine 1 at an excessive speed, the boosting is performed, so that the power supplied from the inverter device 5 to the system 8 is constant due to the characteristics of the inverter device 5.
  • the power flowing through is increased. Therefore, the action of braking the windmill 1 increases, and the windmill 1 stops in a shorter time.
  • the brake start condition determining means 29 determines a plurality of types of rotation speed among the rotation speed of the wind turbine 1, the rotation speed of the generator 3, the generated voltage of the generator 3, the generated power of the generator 3, the input energy of the generator, and the wind speed. May be monitored, and a brake command may be output when any one of the windmill status values is equal to or greater than a threshold, or a brake command may be output when a plurality of types of values are equal to or greater than the threshold.
  • the “threshold value” is a value determined according to each of the rotation speed of the wind turbine 1 and the power generation voltage of the generator 3.
  • the input voltage regulating means 31 may be constituted by a step-down circuit 21 and a step-down control means 38 for controlling the step-down circuit 21.
  • step-down circuit 21 configured to flow a power only when the input voltage V2 is higher than the prescribed voltage V2 0 are obtained in general configuration.
  • the inverter device 5 may include a table control unit 5b that controls the output power according to a table in which the relationship between the input voltage V1 and the output power is determined.
  • the inverter device 5 that is currently generally used generally has a table control format, and the inverter device 5 having this general configuration is applied to the output control device 4 of the wind turbine generator according to the present invention. be able to.
  • FIG. 4 is a diagram showing a relationship example between an input voltage and an output voltage in a table control unit when the output control device according to the embodiment is used. It is a block diagram showing an example of boost control of the boost circuit of the output control device. It is a block diagram showing an example of constant voltage control of input voltage regulation means of the output control device. It is a front view which shows an example of a vertical windmill.
  • FIG. 7 is a sectional view taken along line VII-VII of FIG. 6. It is a block diagram showing the conceptual composition of an example of the electric brake in the conventional wind power generator. It is a block diagram showing the conceptual composition of other examples of the electric brake in the conventional wind power generator.
  • FIG. 1 shows an example of a wind power generator provided with this output control device.
  • the wind power generator includes a wind turbine 1 that converts wind energy into rotational energy, and a generator that is connected to a main shaft 2 of the wind turbine 1 by a coupling (not shown) or the like and converts the rotational energy of the wind turbine 1 into electric energy.
  • 3 and a power conditioner 5 which is an inverter device interposed between the generator 3 and the system 8.
  • An output control device 4 according to this embodiment is interposed between the generator 3 and the power conditioner 5. I do.
  • the generator 3 is, for example, a three-phase synchronous generator.
  • the system 8 is an AC power system such as an AC commercial power system.
  • the generator 3 and the system 8 may be either three-phase or single-phase, and one of the generator 3 and the system 8 may be three-phase and the other may be single-phase, as shown in FIG. Each example shows an example in which three phases are used.
  • a speed increaser (not shown) may be provided between the wind turbine 1 and the generator 3.
  • the windmill 1 may be either a vertical axis windmill or a horizontal axis windmill (propeller type windmill).
  • a vertical axis windmill as shown in FIGS. 6 and 7 is used.
  • a plurality of blades 11 extending vertically around a main shaft 2 are attached via an arm 12 to form a rotor 13, and the main shaft 2 is supported on a frame 15 via a bearing 14.
  • Each blade 11 is provided with winglets 11b at both upper and lower ends of a blade body 11a.
  • the main shaft 2 is shown in a horizontal posture in FIG. 1 for simplification.
  • the power conditioner 5 is a device that converts generated power input as DC into AC power that can be supplied to the AC power system 8.
  • the power conditioner 5 includes an inverter 5a for converting input DC power into AC power, and a table control means 5b.
  • the function of the table control means 5b causes the input voltage V1 to be equal to the specified voltage V1. When it is higher than 0, it has a characteristic that the output is maintained at the specified power regardless of the input voltage V1.
  • the table control means 5b further includes a DC / DC converter and a phase adjusting means (neither is shown) for matching the output current with the phase of the system 8.
  • the table control means 5b has a table which defines the relationship between the input voltage V1 and the output power shown in FIG. 3, and controls the output power according to this table.
  • the table in the figure from zero up to the specified voltage (sometimes referred to as "rated voltage") V1 0, increases as the input voltage V1 becomes higher, when the input voltage V1 exceeds the prescribed voltage V1 0, the input voltage It is determined that the output power remains constant at the specified power even when V1 increases.
  • the power control by the table control means 5b is performed by PWM control of the inverter 5a or the like.
  • the output alternating current may be a single-phase alternating current or a three-phase alternating current, but FIG. 2 shows an example in the case of a three-phase alternating current.
  • an output control device 4 includes a rectifier 22 for converting AC power input from a generator into DC, a booster circuit 21, and power connected to the booster circuit 21 in parallel with the power conditioner 5. and absorption means 32, and an input voltage regulating means 31 only allows current to flow to said power absorbing unit 32 when the input voltage V2 is higher than the prescribed voltage V2 0.
  • the rectifier 22 is provided as a part of the booster circuit 21 in this example.
  • the boosting circuit 21 is controlled by the boosting control means 23.
  • the power absorbing means 32 is composed of a resistor, a so-called dump resistor, but may be a storage battery.
  • the input voltage regulating unit 31 includes a step-down circuit 33 and a step-down control unit 38 that controls the step-down circuit 33.
  • Prescribed voltage V2 0 of the input voltage regulating means 31 is set to be higher than the prescribed voltage V1 0 power conditioner 5.
  • the specified voltage V1 0 of the power conditioner 5 When it is 350 V, the specified voltage V2 0 of the input voltage regulating means 31 is a 355V, the voltage difference between the 5V is set.
  • the rectifier circuit 22 is configured by a bridge circuit using a diode or the like.
  • the booster circuit 31 is a circuit in which switching of boosting on / off and the degree of boosting are variable, and is configured by a chopper circuit or the like.
  • a switching element 26 such as a switching transistor and a capacitor 27 are connected in parallel between the positive side circuit section and the earth side circuit section, and the switching element 26 and the capacitor 27 in the positive side circuit section are connected to each other.
  • a diode 25 is provided therebetween, and an inductance element 45 is provided upstream of the switching element 26.
  • the boost control unit 23 includes a brake start condition determining unit 29 and an output processing unit 28 that causes the boost circuit 21 to perform a boost operation in response to a brake command a output from the brake start condition determining unit 29.
  • the brake start condition determining means 29 is any one of the rotation speed of the wind turbine 1, the rotation speed of the generator 3, the generated voltage of the generator 3, the generated power of the generator 3, the input energy of the generator, and the wind speed.
  • the wind turbine status value is monitored, and when the wind turbine status value exceeds or has reached a threshold value determined for safety of the operation of the wind turbine 1, the brake command a is output.
  • the threshold value is determined according to the type of the windmill status value such as the windmill rotation speed or the generated voltage.
  • the brake start condition determining means 29 determines whether the rotation speed of the wind turbine 1 or the generator 3 has exceeded the threshold value.
  • the wind turbine / generator rotation speed excess determination unit 29a determines that the power generation voltage of the generator 3 has exceeded the threshold value.
  • a generated voltage excess determining unit 29c that determines that the power generated by the generator 3 has exceeded a threshold, and a wind speed detected by an anemometer (not shown) exceeds the threshold.
  • a wind speed excess judging unit 29d for judging that the operation has been performed.
  • the brake start condition judging means 29 outputs the brake command a when any one of the judging sections 29a to 29d or any of a plurality of judging sections 29a to 29d judges that it has exceeded.
  • the output processing means 28 controls an input voltage control unit 28a for controlling an input voltage of the booster circuit 21, which is a main circuit unit, and controls an output voltage when the booster circuit 21 performs a boost operation in response to the brake command a. It has an output voltage control means 28b and an input current control means 28c for controlling an input current.
  • the step-down circuit 33 of the input voltage regulating means 31 for the power absorbing means 32 comprises a step-down chopper circuit in the example of FIG.
  • a switching element 34 such as a switching transistor and an inductance element 36 are provided in the positive side circuit part in order from the input side, and a positive side circuit part, a ground side circuit part and a positive side circuit part are provided between these elements 34 and 36.
  • a capacitor 37 is provided between the positive side circuit unit and the ground side circuit unit on the output side of the inductance element 36.
  • the input voltage V2 can be controlled by opening and closing the switching element 34 by PWM control or the like.
  • Step-down control unit 38 is a main circuit unit and the input voltage constant control means 40 outputs the input voltage command value for controlling the constant value of the input voltage V2 becomes the prescribed voltage V2 0 of the step-down circuit 33, the input voltage An output processing unit 39 for controlling the switching element 34 using a signal output from the constant control unit 40 is provided.
  • the output processing means 39 includes an input voltage control means 41 for controlling the input voltage V2 of the step-down circuit 33, an output voltage control means 42 for controlling the output voltage, and an output current control means 43 for controlling the output current.
  • the power absorbing means 32 such as a resistor, so that the braking is performed. Also secures the power of the system 8.
  • Power conditioner 5 is a table control scheme according to the table control unit 5b, as described above in conjunction with FIG. 3, until it reaches a specified voltage V1 0 input voltage V1 is much output power as it rises.
  • the power conditioner 5 the output power is also increased input voltage V1 by the function of the table control of the table control unit 5b is in a state of not rise.
  • power absorbing means 32 such as a resistor in parallel with the power conditioner 5
  • the voltage becomes possible power absorbed by the power absorbing means 32 is limited to a specified voltage V2 0 by the input voltage regulating means 31 .
  • the prescribed voltage V2 0 is higher is set than the prescribed voltage V1 0 input of the power conditioner 5, the priority is generated. Therefore, normally, the generated power is not absorbed by the power absorbing means 32, and all of the generated power (excluding the circuit loss) is supplied to the system 8 via the power conditioner 5.
  • a boosting circuit 21 for boosting the voltage of the generator 3 is connected in front of the power conditioner 5 and the power absorbing means 32, and can perform a boosting operation at a timing when the (electrical) brake is to be applied to the wind turbine 1. .
  • the wind speed increases, and the brake start condition determining means 28 determines that any one of the rotation speed, the generated voltage, the generated power, the input energy, and the wind speed of the wind turbine 1 or the generator 3 exceeds the threshold set for each value. If it is determined that the brake command has been issued, a brake command a is output. In response to the brake command a, the output processing means 28 causes the booster circuit 21 to perform a boost operation.
  • the booster circuit 21 is boosting operation, firstly, the output voltage rises to the predetermined voltage V1 0 power conditioner 5. If the V1 0, is defined power supplied from the power conditioner 5 to the grid 8. Furthermore if there is energy of the wind turbine 1 side, further power output is increased by the step-up circuit 21, reaches the predetermined voltage V2 0 input limiting means 31 of the power absorbing means 32. Upon reaching the prescribed voltage V2 0, power is drawn into the power absorbing means 32 comprising resistors or the like.
  • the power conditioner 5 that supplies power to the system 8 is followed by the power absorbing means 32 such as a resistor in order. Therefore, the highest priority is to supply power to the system 8. Further, since the power conditioner 5 for supplying power to the system 8 is also used for the electric brake, the resistance capacity of the power absorbing means 32 can be reduced, and the size can be reduced.
  • FIG. 4 shows an example of boost control by the output processing means of the boost control means 23 of FIG.
  • the output voltage detection value Vout is subtracted from the output voltage command value Vref (out) by the comparison unit 51, and the calculated value is input to the output voltage control unit 28b.
  • the output voltage control means 28b performs PI control (proportional-integral control).
  • the input current detection value Iin is subtracted from the output of the output voltage control unit 28b by the comparison unit 52, and the calculated value is input to the input current control unit 28c.
  • the input current control unit 28c performs PI control (proportional-integral control).
  • the output of the input current control unit 28c is converted into a PWM (pulse width modulation) signal by the PWM output unit 53, and is input to the control input terminal of the switching element 26 (see FIG. 2) in the booster circuit 21.
  • PWM pulse width modulation
  • the output voltage command value Vref (out) is the value stored as the predefined value in the microcomputer or the like that constitutes the output control unit 4, is basically to the prescribed voltage V2 0 or more.
  • the output voltage detection value Vout is a detection value of a current detection means (not shown) provided at the output terminal of the booster circuit 21.
  • the input current detection value Iin is a detection value of a current detection unit (not shown) that detects a current flowing through a portion immediately after rectification by the rectification unit 22 of the booster circuit 21.
  • the input voltage control means 28a of FIG. 2 is added to the circuit of FIG. 4 as necessary.
  • the input voltage control means 28a is used when controlling the input voltage as a target value. For example, the input voltage target value is controlled to be 0V.
  • FIG. 5 shows an example of constant voltage control by the step-down control means 38 of FIG.
  • the comparison unit 61 subtracts the input voltage detection value Vin from the input voltage command value Vref (in), and the calculated value is input to the input voltage control unit 41.
  • the input voltage control means 41 performs PI control (proportional-integral control).
  • the output current detection value Io is subtracted from the output of the input voltage control means 28 b by the comparison unit 62, and the calculated value is input to the output current control means 43.
  • the output current control means 43 performs PI control (proportional-integral control).
  • the output of the output current control unit 43 is converted into a PWM (pulse width modulation) signal by the PWM output unit 63, and is input to the control input terminal of the switching element 34 (see FIG. 2) in the step-down circuit 21.
  • PWM pulse width modulation
  • the input voltage command value Vref (in) is a value set in the input constant control means 40.
  • the input voltage detection value Vin is a detection value of current detection means (not shown) provided at the input terminal of the step-down circuit 33.
  • the output current detection value Iout is a detection value of current detection means (not shown) for detecting a current flowing through a portion of the step-down circuit 33 immediately after rectification by the rectification means 22.
  • the output voltage control means 42 of FIG. 2 is added to the circuit of FIG. 5 as necessary. Although the output current is not controlled in the example of FIG. 4, the output current is also controlled in the example of FIG.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

Selon la présente invention, l'énergie électrique peut être fournie de préférence à un système même pendant une opération de freinage d'une éolienne, un moyen d'absorption de petite puissance telle qu'une résistance prévue pour l'opération de freinage peut être utilisée, et l'opération de freinage de l'éolienne peut être effectuée à faible coût. Ce dispositif de commande de sortie (4) est interposé entre un générateur (3) et un dispositif onduleur (5) qui fournit de l'énergie à un système (8), et a un circuit survolteur (21). Le dispositif onduleur (5) a une caractéristique de maintien de sortie à une puissance prescrite quelle que soit la tension d'entrée lorsque la tension d'entrée est supérieure à une tension prescrite. Un moyen d'absorption de puissance (32) comprenant une résistance ou un moyen de stockage d'énergie est connecté en parallèle avec le dispositif onduleur (5). Un moyen de régulation de tension d'entrée (31) permet à un courant de circuler vers les moyens d'absorption d'énergie (32) uniquement lorsque la tension d'entrée est supérieure à la tension prescrite. La tension prescrite du moyen de régulation de tension d'entrée (31) est supérieure à la tension prescrite du dispositif onduleur (5).
PCT/JP2019/026125 2018-07-03 2019-07-01 Dispositif de commande de sortie pour générateur d'énergie éolienne WO2020009065A1 (fr)

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JP2018-126672 2018-07-03
JP2018126672A JP7068949B2 (ja) 2018-07-03 2018-07-03 風力発電装置の出力制御装置

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022206461A1 (fr) * 2021-03-30 2022-10-06 华为数字能源技术有限公司 Système d'alimentation électrique et procédé de commande de tension de sortie pour boîte de combinaison à courant continu

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110163544A1 (en) * 2010-01-04 2011-07-07 Vestas Wind Systems A/S Method for operating a power dissipating unit in a wind turbine
JP2013183491A (ja) * 2012-02-29 2013-09-12 Wind-Smile Co Ltd 風力発電制御装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110163544A1 (en) * 2010-01-04 2011-07-07 Vestas Wind Systems A/S Method for operating a power dissipating unit in a wind turbine
JP2013183491A (ja) * 2012-02-29 2013-09-12 Wind-Smile Co Ltd 風力発電制御装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022206461A1 (fr) * 2021-03-30 2022-10-06 华为数字能源技术有限公司 Système d'alimentation électrique et procédé de commande de tension de sortie pour boîte de combinaison à courant continu

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