WO2017094047A1 - Dispositif de conversion de puissance - Google Patents

Dispositif de conversion de puissance Download PDF

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Publication number
WO2017094047A1
WO2017094047A1 PCT/JP2015/083519 JP2015083519W WO2017094047A1 WO 2017094047 A1 WO2017094047 A1 WO 2017094047A1 JP 2015083519 W JP2015083519 W JP 2015083519W WO 2017094047 A1 WO2017094047 A1 WO 2017094047A1
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Prior art keywords
phase
unit
power
output
input
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PCT/JP2015/083519
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English (en)
Japanese (ja)
Inventor
叶田　玲彦
泰明 乗松
尊衛 嶋田
充弘 門田
祐樹 河口
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株式会社日立製作所
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Priority to PCT/JP2015/083519 priority Critical patent/WO2017094047A1/fr
Publication of WO2017094047A1 publication Critical patent/WO2017094047A1/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
    • 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.
  • the power converter has a role to convert the power supplied from the commercial system into a voltage required for the load and supply it.
  • the commercial system is generally a three-phase alternating current, and its rated voltage is a voltage of several kV or more and tens of thousands of volts.
  • the voltage required by the load is often about 200V to 400V, a method of stepping down the voltage using a commercial transformer has been used in the past, and once it has been reduced from several kV to several tens of thousands V to 200V to 400V.
  • the stepped down voltage is input to the power conversion device for power conversion.
  • uninterruptible power supplies are equipped with a battery in the device so that the power supplied to the load can be stably supplied even when the commercial system fails. Either of the received power and a configuration that can always supply power to the load is employed.
  • the high-frequency link is a technique in which a power semiconductor element is used to generate high-frequency alternating current that is sufficiently higher than the commercial frequency, and insulation is provided via a high-frequency transformer that is sufficiently smaller than the commercial transformer.
  • the allowable voltage on the input system side depends on the breakdown voltage of the power semiconductor element. Since the breakdown voltage of the power semiconductor is several kV or less, it cannot receive a high voltage of several kV to several tens of thousands of V as described above.
  • the commercial transformer can be deleted by solving the problem of withstand voltage, the following problem remains. That is, when the commercial transformer is deleted, a high-voltage commercial alternating current is received and input to the power converter, and a low voltage is output from the power converter. Because the input / output voltage of the power converter is different, when the power converter fails or when performing maintenance of the power converter, the bypass circuit provided in a general uninterruptible power supply is applied. The problem that it cannot be generated occurs.
  • the deletion of the commercial transformer has been an issue in order to reduce the volume, weight, and installation area of the commercial transformer.
  • Proposal of a method for receiving high-voltage commercial alternating current has been an issue.
  • a proposal for an alternative means of a bypass circuit that continues to supply power to a load at the time of maintenance, failure, or diagnosis in a high-voltage power receiving and low-voltage output type power converter has been a problem.
  • An object of the present invention is to provide a highly reliable power conversion device when a commercial transformer is deleted.
  • a power converter that outputs AC power having a voltage different from the input voltage
  • the power converter including at least three units to which each phase voltage is applied,
  • Each unit has a plurality of cell converters whose inputs and outputs are insulated by high-frequency transformers, and a plurality of cell converters are connected in series on the input side of each unit, bypassing the input terminals of each cell converter. It has a power converter provided with a short circuit part.
  • FIG. 6 is a diagram illustrating a circuit configuration of three-phase units 4a to 4c and a spare three-phase unit 4d according to the third embodiment.
  • FIG. 10 is a diagram illustrating a circuit block configuration of a fourth embodiment.
  • FIG. 1 is a diagram illustrating a circuit configuration of the power conversion apparatus according to the present embodiment.
  • 1 is a commercial AC system
  • 2 is an input side phase selection switch
  • 3a to 3c are units
  • 3d is a spare unit
  • 5 is a charge storage unit such as a battery
  • 6 is a control unit
  • 7 is a load
  • 8 is An output side phase selection switch
  • 9 is an input side filter
  • 10 is an output side filter
  • 11a to 11d are phase inputs
  • 12 is an input side neutral wire
  • 13a to 13d are phase outputs
  • 14 is an output side neutral wire.
  • the commercial AC system 1 is a three-phase AC and is connected to the units 3 a, 3 b, and 3 c via the input side filter 9.
  • the U-phase input 11a is connected to the unit 3a
  • the V-phase input 11b is connected to the unit 3b
  • the W-phase input 11c is connected to the unit 3c.
  • the three phases of the commercial AC system 1 are connected to the input side phase selection switch 2.
  • the output of the input side phase selection switch 2 is connected to the spare unit 3d as the phase input 11d.
  • the spare unit 3d has the same configuration as 3a to 3c, as will be described later.
  • An input-side neutral wire 12 is connected to the units 3a to 3c and the spare unit 3d.
  • a charge storage unit 5 is connected to the units 3a to 3c and the spare unit 3d.
  • a U-phase output 13a and an output-side neutral wire 14 are connected to the unit 3a.
  • the V-phase output 13b and the output-side neutral wire 14 are connected to the unit 3b, and the W-phase output 13c and the output-side neutral wire 14 are connected to the unit 3c.
  • the U-phase output 13a, the V-phase output 13b, and the W-phase output 13c are connected to the load 7 via the output side filter 10.
  • the phase output 13d which is the output of the spare unit 3d is connected to the output side phase selection switch 8.
  • the U-phase output 13a, the V-phase output 13b, and the W-phase output 13c are connected to the output side phase selection switch 8.
  • the control unit 6 is connected to the units 3a to 3c and the spare unit 3d. Further, the control unit 6 is connected to the input side phase selection switch 2 and the output side phase selection switch 8 and controls these switches. The control unit 6 is also connected to each of the units 3a to 3d and controls each unit.
  • FIG. 2 is a diagram showing an internal circuit configuration of the units 3a to 3c and the spare unit 3d of the power conversion device of the present embodiment.
  • 11 is a phase input
  • 15 is an AC / DC bridge
  • 16 is a high frequency link converter
  • 17 is a single phase inverter bridge
  • 18 is a high frequency transformer
  • 19 is a cell converter
  • 20 is a bypass switch
  • 22 is a resonance.
  • a capacitor 23 is a connection line.
  • the input and output of a large number of cell converters 19 are connected. Inside the cell converter 19, an AC / DC bridge 15, a high-frequency link converter 16, and a single-phase inverter bridge 17 are built in order from the input side. .
  • the AC / DC bridge 15 includes four power semiconductors configured as a so-called full bridge and a DC smoothing capacitor 25a.
  • a drive circuit for each power semiconductor and a control unit 6 for outputting an on / off signal are provided.
  • phase input 11 is connected to the midpoint of the upper and lower arms of one leg of the AC / DC bridge 15, and the connection line 23 is connected to the midpoint of the other leg of the AC / DC bridge 15.
  • a bypass switch (short-circuit portion) 20 is provided between the phase input 11 and the connection line 23.
  • a high frequency link converter 16 is connected to the DC output side of the AC / DC bridge 15.
  • the high-frequency link converter 16 has a full-bridge configuration with a power semiconductor on the input side, and a primary-side winding and a resonant capacitor 22 of the high-frequency transformer 18 at the midpoint of the upper and lower arms of each leg. Are connected in series. Although not shown, a drive circuit for each power semiconductor and a control unit 6 for outputting an on / off signal are provided. On the other hand, the secondary side windings of the high-frequency transformer 18 are respectively connected to the AC side terminals of the diode bridge on the secondary side.
  • a DC smoothing capacitor 25 b is connected to the DC side terminal of the diode bridge, and both ends of the series smoothing capacitor 25 b serve as the output of the high-frequency link converter 16.
  • the output of the high frequency link converter 16 is connected to the DC side terminal of the single phase inverter bridge 17.
  • the single-phase inverter bridge 17 is a full bridge made of a power semiconductor like the AC / DC bridge 15, and a phase output 13 and an output-side neutral wire 14 are respectively provided at the midpoints of the upper and lower arms of each leg. Connected.
  • a drive circuit for each power semiconductor and a control unit 6 for outputting an on / off signal are provided.
  • the input side of each cell converter 19 is connected in series by a connection line 23, and among them, the input side terminals of the cell converter 19 at both ends are the phase input 11 and the input side neutral line 12.
  • the output side of each cell converter 19 is connected to the phase output 13 and the output side neutral wire 14 as described above, and the outputs of the respective cell converters are connected in parallel.
  • the phase voltage of the commercial AC system 1 is applied between the phase input 11 and the input side neutral wire 12 to the units 3a to 3c, respectively.
  • the input side of the cell converter 19 in each of the units 3a to 3c is equivalent to eight.
  • all the AC / DC bridges 15 are connected in series.
  • the phase voltage of the commercial AC system 1 is divided into eight.
  • the eight AC / DC bridges 15 connected in series are gradation controlled in synchronization with the phase voltage of the commercial AC system 1, and the input side filter 9 has less harmonics and has a power factor of 1 synchronized with the phase voltage.
  • the waveform is controlled to be a sine wave.
  • Each AC / DC bridge 15 controls the pulse width for turning on and off the power semiconductor so that the voltage of each DC smoothing capacitor 25a is equalized.
  • the operation of the high frequency link converter 19 will be described.
  • a series resonance circuit is formed by the resonance capacitor 22 with respect to the excitation inductance and the leakage inductance existing inside the high frequency transformer 18. Since this series resonance circuit has a specific resonance frequency, the power generated on the secondary side of the high-frequency transformer 18 is controlled by controlling the frequency at which the bridge on the primary side (input side) is operated. It is possible.
  • power corresponding to the operating frequency of the primary-side bridge of the high-frequency link converter 19 is rectified to become DC power, which is output to both ends of the DC smoothing capacitor 25b.
  • the DC voltage output to both ends of the DC smoothing capacitor 25 b is connected to the charge storage unit 5 and charges the charge storage unit 5.
  • the operation of the single-phase inverter bridge 17 will be described. All of the eight single-phase inverter bridges 17 are connected in parallel. By operating the upper and lower arms of each single-phase inverter bridge 17 in synchronization, the phase output 13 and the output-side neutral wire 14 are connected. A PWM (pulse width modulation) waveform is output between them. By smoothing this waveform by the output side filter 10 of FIG. 1, a sinusoidal AC waveform similar to the waveform of the input voltage can be formed.
  • PWM pulse width modulation
  • the units 3a to 3c receive the phase voltages of the high-voltage commercial AC system 1 and insulate them with the high-frequency transformer 18, and then reconvert them into commercial AC voltages that are lower in voltage than the input, and feed the load 7.
  • the present embodiment does not require the input voltage to be higher than the output voltage, and can be applied to a power converter that outputs AC power having a voltage different from the input voltage.
  • Each unit 3a to 3c performs the same operation as described above, and outputs phase voltages of U phase, V phase, and W phase, respectively.
  • the rated voltage of the input commercial AC system 1 is 6.6 kV
  • the rated voltage of the output is about 200 V or 400 V.
  • FIG. 3 is a waveform of each part during the maintenance and inspection operation of the unit (V phase) 3b of (c) of the present embodiment, and the horizontal axis indicates time.
  • (A) is an input voltage of each phase, and Vu, Vv, and Vw correspond to voltages between 11a, 11b, and 11c in FIG.
  • (B) to (d) are a unit (U-phase) output voltage, a unit (V-phase) output voltage, and a unit (W-phase) output voltage, respectively, and 13a, 13b, and 13c in FIG. It corresponds to the voltage between the lines 14.
  • (E) and (f) are waveforms showing the states of the input side phase selection switch 2 and the output side phase selection switch 8.
  • (G) is an output voltage waveform of the spare unit 3d, which corresponds to a voltage between the phase output 13d and the output-side neutral wire 14 in FIG.
  • the operation during maintenance replacement will be described as an example.
  • the operation when the V-phase unit 3b is inspected or the cell converter 19 in the unit 3b is replaced is performed as follows.
  • the controller 6 issues a command to the input side phase selection switch 2 at time t1, and the input side phase selection switch 2 selects the V phase.
  • the input-side phase selection switch 2 is brought into contact with the V-phase with a certain delay time from t1 and becomes conductive.
  • the V phase of the commercial AC system 1 and the phase input 11 d of the standby unit 3 d are connected, and the V phase voltage Vv of the commercial AC system 1 is applied between the phase input 11 d and the input-side neutral line 12.
  • the output side phase selection switch 8 is turned on at time t2.
  • the contact of the output side phase selection switch 8 contacts the V phase with a certain delay time and becomes conductive. Since the voltage applied to the output side phase selection switch 8 is lower than the voltage applied to the input side phase selection switch 2, the contact distance is short and the delay time is short. Therefore, the input timing is advanced on the input side phase selection switch 2 side in consideration of the difference in these delay times.
  • the control unit 6 instructs the spare unit 3d to start up in the V phase.
  • the output voltage of the standby unit 3d is generated.
  • the spare unit 3d may obtain the V-phase phase from the control unit 6, or may match the phase to the phase of the waveform of the phase input 11d.
  • the time period from time t3 to t4 is a period in which the units 3b and 3d are operating.
  • the output side of the unit 3b and the spare unit 3d has a period of simultaneous operation as shown in FIG.
  • the power of the unit 3b is gradually reduced and the output power of the spare unit 3d is gradually increased.
  • voltage fluctuation at the time of switching from the unit 3b to the spare unit 3d can be eliminated, and adverse effects on the load 7 can be avoided.
  • the operation of the unit 3b is stopped and maintenance inspection is performed.
  • the operation frequency is changed to control the output voltage to be constant.
  • the output power increases to 8/7.
  • the input voltage does not change compared to before the failure, only the output current increases, and as a result, the power supplied to the load 7 is not affected.
  • the units of other phases are not affected at all, and the phase voltages are continuously output.
  • the failed cell converter 19 can be replaced while it is operating without performing a stop operation as a power converter when another cell converter 19 continues to operate.
  • FIG. 4 is an operation waveform of each part when a unit failure occurs in this embodiment.
  • the output voltage of the unit (V-phase) 3b in (c) once becomes 0V at t5.
  • the control unit 6 detects a failure of the V-phase unit.
  • the output side phase selection switch 8 of (f) is connected to the V phase.
  • the terminal of the output side phase selection switch 8 contacts the V phase terminal with a certain delay time, and the spare unit 3d is connected to the V phase.
  • the input side phase selection switch 2 is set to V phase and connected.
  • the standby unit 3d starts battery operation using the power from the charge storage unit 5.
  • the reason for taking such a procedure is that it is difficult to obtain an agile ON / OFF operation from the viewpoint of the insulation distance between the movable terminals since the input side phase selection switch 2 is a switch that handles high voltage. Therefore, first, the output side phase selection switch 8 is preferentially set to the V phase, and the spare unit 3d is activated at a high speed in the V phase by the electric power from the charge storage unit 5, and the load 7 is supplied with power. After that, by connecting the input side phase selection switch 2 to the V phase, the standby unit 3d switches from the battery operation to the operation with the V phase power of the commercial AC system 1 and continues the operation.
  • one of the three phases is output from one unit.
  • each cell converter 19 is changed to a configuration in which two DC smoothing capacitors 25b of the single-phase inverter bridge 17 are connected in series.
  • a so-called V-connection inverter output in which the potential output from the middle point is the V phase, the output of the midpoint of one leg of the single-phase inverter bridge 17 is the U phase, and the output of the midpoint of the other leg is the W phase. It is also possible to configure as.
  • the charge storage unit 5 may be connected to the DC smoothing capacitor 25a.
  • Example 2 will be described with reference to FIGS.
  • FIG. 5 is a diagram showing a circuit block configuration of the present embodiment.
  • the same components as those in FIG. In FIG. 5, 4a to 4d are three-phase units.
  • FIG. 5 The configuration of FIG. 5 will be described. Many of the configurations in FIG. 5 are the same as those in FIG. 5 differs from FIG. 1 in that the units 3a to 3c and the spare unit 3d are changed to the three-phase units 4a to 4c and the spare three-phase unit 4d, and the output side phase selection switch 8 is not provided. .
  • FIG. 6 is a diagram showing a circuit configuration of the units 4a to 4c and the spare three-phase unit 4d of the present embodiment.
  • the same components as those in FIG. 24 is a three-phase inverter bridge.
  • each phase of the input commercial system 1 is connected to three-phase units 4a, 4b, 4c by phase inputs 11a, 11b, 11c, respectively.
  • eight cell converters 19 are built in the three-phase unit 4.
  • eight AC / DC bridges 15 are connected in series by a connection line 23.
  • Each AC / DC converter 15 rectifies the phase voltage divided by the serial connection and performs power factor correction control for reducing storm surge waves.
  • the power rectified by the AC / DC converter 15 is input to the high-frequency link converter 16 and is rectified again by a diode bridge on the secondary side of the high-frequency transformer 18 to become DC power.
  • This direct-current power is associated with the charge storage unit 5 and is used to charge the charge storage unit 5 and is also input to the three-phase inverter bridge 24.
  • the three-phase inverter bridge 24 performs switching control on a 6-arm power semiconductor to generate three-phase AC power.
  • the outputs of the eight cell converters 19 are collected into a U-phase output 13a, a V-phase output 13b, and a W-phase output 13c and output toward the load 7.
  • the controller 6 detects the failure of the three-phase unit 4c and sets the input phase selection switch 2 to the W-phase, The W phase is connected to the phase input 11d of the three-phase unit 4d.
  • the standby three-phase unit 4d is activated.
  • the output power of the unit 3c is gradually reduced, and at the same time, the output power of the standby three-phase unit 4d is gradually increased. After the output power of the three-phase unit 4c is reduced to zero, the input / output of the three-phase unit 4c is shut off and maintenance work is performed.
  • each cell converter 19 since the output side of each cell converter 19 has a three-phase inverter configuration as compared with the first embodiment, there is no risk of losing all the output of the specific phase due to the failure of one cell converter 19. Since the output side does not require a phase selection switch and the spare three-phase unit 4d is directly connected, it is characterized by higher reliability.
  • Example 3 of the present invention will be described with reference to FIG.
  • FIG. 7 is a diagram illustrating a circuit configuration of the three-phase units 4a to 4c and the spare three-phase unit 4d according to the third embodiment.
  • the same symbols are assigned to the same components as in the other drawings.
  • six cell converters 19 are connected in series by connection lines 23.
  • two cell converters 19 are connected in parallel to each other, and their outputs are grouped into a U-phase output 13a, a V-phase output 13b, and a W-phase output 13c. Further, the output side neutral wires 14 are drawn from all the cell converters 19 and connected in parallel.
  • the three-phase units 4a to 4c and the spare three-phase unit 4d that are input from the respective phase voltages are all configured to output a three-phase AC, and therefore, when the commercial AC system 1 has a one-phase ground fault.
  • the three-phase output can be secured, so it is highly reliable.
  • the input sides of the six cell converters 19 are connected in series and two units are connected in parallel, but the number of cell converters and the number of parallel units may be changed. Moreover, it is good also as an output line of each phase voltage, without outputting a neutral line.
  • Embodiment 4 of the present invention will be described with reference to FIG.
  • FIG. 8 is a diagram illustrating a circuit block configuration of the fourth embodiment.
  • 21 is a switch. This embodiment is different from the other embodiments in that a switch 21 is incorporated in each phase on the input side, and that the outputs of the units 3a to 3c and the spare unit 3d are two-phase and neutral lines. It is.
  • the cell converter 19 inside the unit 3a has eight units on the input side in series as shown in the figure, while the output side outputs U phase with four of the eight units in parallel, The remaining four units are output in parallel to output the V phase.
  • four units 3b each output V and W phases, and unit 3c outputs W and U phases.
  • the operation when any of the cell converters 19 inside the units 3a to 3c fails is the same as that of the other embodiments, and the failed cell is formed by short-circuiting the bypass switch 20 provided on the input side of each cell converter 19.
  • the converter is disconnected and the output is continued by the sound cell converter 19.
  • the spare unit 3d is activated by switching the phase selection switch 2 to the phase of the unit to be inspected.
  • the input side phase selection switch 2 selects the U phase
  • the output side phase selection switch 8 is set to the U phase and the V phase.
  • the output side phase selection switch 8 is set to the V phase and the W phase.
  • the output side phase selection switch 8 is set to the W phase and the U phase.
  • the spare unit 3d is activated so that the phase with the phase to which the output side phase selection switch 8 is connected is matched, and the output is gradually increased.
  • the unit 3 to be maintained any one of 3a to 3c gradually reduces the output power and opens the connected switch 21 after the output becomes zero. Note that the input / output phases of each of the units 3a to 3c may be other combinations.
  • the power semiconductor used in the embodiment of the present invention is optimally a SiC power MOSFET having a withstand voltage of 1200 V, but may be a Si MOSFET or an IGBT.
  • the driving frequency of the high-frequency transformer is assumed to be about 20 kHz to 100 kHz, avoiding the audible frequency, but other frequencies may be selected. Although it is assumed that ferrite is used for the core, other high-frequency core materials may be used.
  • the charge storage unit 5 is preferably a lead storage battery, a Li ion secondary battery, a nickel metal hydride battery, or the like, but may employ mechanical means such as a flywheel.
  • a switch 21 may be provided on the input side and the output side.
  • Each unit may be housed in the same housing, or may be mounted on a housing having an individual lid in consideration of maintainability.
  • the input / output voltage of the commercial AC system may be another voltage.
  • the present invention since it is possible to receive power by directly connecting commercial AC to the power converter, a conventional commercial transformer becomes unnecessary. Along with this, it is possible to delete components such as a transformer protection relay, a high-voltage current limiting fuse, and a phase advance capacitor for countermeasures against inrush current.
  • a transformer protection relay in order to operate the power converter as an aggregate of cell converters, it is continued by short-circuiting the input terminals of the cell converter and sharing power with the remaining cell converters at the time of failure, maintenance, and diagnosis of the cell converter. It is possible to drive.
  • the power conversion device can be continuously operated by operating the spare unit and switching the failed unit to the spare unit.
  • the uninterruptible power supply using the present invention can eliminate the commercial transformer, it is possible to increase the output density as compared with the prior art, and it is possible to install a large-capacity apparatus on the same floor area. This can meet the demand for high-density replacement of uninterruptible power supply devices. Moreover, since the power converter can be reduced in weight by deleting the commercial transformer, the transportation can be facilitated, and the possibility of installation on a floor surface having a weight limit can be expanded.

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  • Power Engineering (AREA)
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Abstract

La présente invention porte sur un dispositif de conversion de puissance qui délivre en sortie un courant alternatif ayant une tension différente d'une tension d'entrée et est caractérisé par le fait qu'il présente : au moins trois unités auxquelles des tensions de phase sont appliquées respectivement ; une pluralité de convertisseurs à cellule dans chacune des unités, lesdits convertisseurs à cellule ayant chacun des parties entrée et sortie isolées par un transformateur haute fréquence et étant montées en série sur le côté entrée de chacune des unités ; et comportant une partie court-circuit destinée à court-circuiter les bornes d'entrée de chacun des convertisseurs à cellule.
PCT/JP2015/083519 2015-11-30 2015-11-30 Dispositif de conversion de puissance WO2017094047A1 (fr)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
JP7491814B2 (ja) 2020-10-30 2024-05-28 ナブテスコ株式会社 Ａｃ－ａｃコンバータ

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JP2009106081A (ja) * 2007-10-23 2009-05-14 Mitsubishi Heavy Ind Ltd 電力変換器
JP2014502135A (ja) * 2011-06-24 2014-01-23 アーべーべー・テヒノロギー・リミテッド 風力変換器
JP2015508277A (ja) * 2012-02-22 2015-03-16 インスティチュート ポリテクニック デ グレノーブル 電圧変換器
JP2015156740A (ja) * 2014-02-20 2015-08-27 東芝三菱電機産業システム株式会社 電力変換装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009106081A (ja) * 2007-10-23 2009-05-14 Mitsubishi Heavy Ind Ltd 電力変換器
JP2014502135A (ja) * 2011-06-24 2014-01-23 アーべーべー・テヒノロギー・リミテッド 風力変換器
JP2015508277A (ja) * 2012-02-22 2015-03-16 インスティチュート ポリテクニック デ グレノーブル 電圧変換器
JP2015156740A (ja) * 2014-02-20 2015-08-27 東芝三菱電機産業システム株式会社 電力変換装置

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