EP2973964A1 - Agencement, convertisseur de fréquence et système élévateur - Google Patents

Agencement, convertisseur de fréquence et système élévateur

Info

Publication number
EP2973964A1
EP2973964A1 EP13878495.4A EP13878495A EP2973964A1 EP 2973964 A1 EP2973964 A1 EP 2973964A1 EP 13878495 A EP13878495 A EP 13878495A EP 2973964 A1 EP2973964 A1 EP 2973964A1
Authority
EP
European Patent Office
Prior art keywords
circuit
bridge
filter
voltage
voltage circuit
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP13878495.4A
Other languages
German (de)
English (en)
Other versions
EP2973964A4 (fr
Inventor
Juha-Matti Nikander
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kone Corp
Original Assignee
Kone Corp
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 Kone Corp filed Critical Kone Corp
Publication of EP2973964A1 publication Critical patent/EP2973964A1/fr
Publication of EP2973964A4 publication Critical patent/EP2973964A4/fr
Withdrawn legal-status Critical Current

Links

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
    • H02M5/453—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 triode or transistor type requiring continuous application of a control signal
    • H02M5/458—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/24—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration
    • B66B1/28—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical
    • B66B1/30—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical effective on driving gear, e.g. acting on power electronics, on inverter or rectifier controlled motor
    • B66B1/308—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical effective on driving gear, e.g. acting on power electronics, on inverter or rectifier controlled motor with AC powered elevator drive
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/123—Suppression of common mode voltage or current
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/50—Reduction of harmonics

Definitions

  • the invention relates to solutions for filtering the interference of a power bridge comprising controllable switches. Background of the invention
  • a power bridge such as the network bridge or the motor bridge of a frequency converter, comprises controllable solid-state switches, such as IGBT transistors, by switching which the power to be supplied via the frequency converter is adjusted. Interference is produced by the operation of solid-state switches, which interference is transmitted into the environment as conducted and as radiated interference. Interference also connects to surrounding structures, causing leakage currents. Leakage currents can cause p.g. tripping of residual current protection.
  • the interference can be filtered with earthed filter circuits, via which interference is conducted to the ground plane.
  • a problem when using these types of filter circuits is that the interference to be filtered further forms ground leakage currents, which cause tripping of residual cun-ent protectors. Also some electrical safety regulations limit the maximum permitted values for ground leakage current.
  • the aim of the invention is to disclose a solution for reducing the leakage currents produced by operation of a power bridge.
  • the invention discloses an arrangement according to claim 1, a frequency converter according to claim 8, and also an elevator system according to claim 11.
  • the preferred embodiments of the invention are described in the dependent claims.
  • the arrangement according to the invention comprises a power bridge connected between an AC voltage circuit and a DC voltage circuit, which power bridge comprises controllable switches for supplying electric power between the AC voltage circuit and the DC voltage circuit.
  • the arrangement also comprises an unearthed common-mode filter circuit, which filter circuit is connected between the aforementioned AC voltage circuit and aforementioned DC voltage circuit, in connection with the power bridge. This means that the current path for the interference to be filtered connects from the AC voltage circuit back to the DC intermediate circuit, and consequently it is not necessary to conduct the interference to the ground plane. When interference is not conducted to the ground plane, ground leakage currents produced in the interference filtering dissipate or are at least essentially reduced.
  • the term "unearthed common-mode filter circuit” means that the aforementioned filter circuit is not, in itself, connected to a ground potential from any point whatsoever.
  • the power bridge is a bi-level inverter circuit, which comprises for each phase of the AC voltage circuit, connected in series, a high-side switch connected to the positive conductor of the DC voltage circuit and also a low-side switch connected to the negative conductor of the DC voltage circuit.
  • a phase of the AC voltage circuit is connected to the connection point of the aforementioned high-side and low-side switches.
  • the high-side and the low-side switches are connected with pulse width modulation.
  • a bi-level inverter circuit produces, particularly with pulse-width modulation, strong common-mode interference in the AC voltage circuit, which interference can be effectively filtered by means of the filter circuit according to the invention.
  • the aforementioned filter circuit is configured to form for the common-mode interference a current path from the AC voltage circuit to the DC voltage circuit. This means that the passage of common- mode interference via the AC voltage circuit to the load being supplied can be prevented by means of the filter circuit.
  • the switching frequency of the power semiconductors is between approx. 3 kilohertz - 10 kilohertz. In some other embodiments the aforementioned switching frequency is over 10 kilohertz but below 150 kilohertz.
  • the filter circuit comprises a plurality of Filter capacitors, every other pole of which is connected to a different phase of the AC voltage circuit and every other pole is connected together with the other filter capacitors forming a neutral point.
  • the filter circuit comprises a resistor, which is connected between the aforementioned neutral point of the filter capacitors and the DC intermediate circuit.
  • the filter circuit comprises a common- mode choke, which is fitted into the AC voltage circuit between the aforementioned connection point of the filter capacitors and the power bridge.
  • the common-mode choke forms a low-pass filter in the filter circuit, which low-pass filter also prevents e.g. overlarge current in the filter circuit caused by the third harmonic of the fundamental frequency of the AC voltage circuit.
  • the components of the filter circuit are disposed on the current path of common-mode interference in series between the AC voltage circuit and the DC voltage circuit.
  • the series circuit of the common-mode choke, the filter capacitors and the resistor form a series circuit of low-pass and high-pass filters from the viewpoint of common-mode interference current as well as a low-pass filter from the viewpoint of common-mode voltage.
  • the circuit also forms a low-pass filter from the viewpoint of the differential-mode voltage signal.
  • the AC voltage circuit comprises at the connection point of the aforementioned plurality of filter capacitors and the common- mode choke a connection for the load to be supplied with the power bridge. This means that the filter circuit according to the invention prevents common-mode interference from traveling to the load being supplied.
  • the frequency converter comprises a network bridge connected between the AC voltage input and the DC intermediate circuit, which network bridge comprises controllable solid-state switches for supplying electric power between an AC network to be connected to an AC voltage input and the DC intermediate circuit and also a motor bridge connected between the DC intermediate circuit and the AC voltage output, which network bridge comprises controllable electronic solid-state switches for supplying electric power between the DC intermediate circuit and an alternating current motor to be connected to the AC voltage input.
  • the frequency converter comprises a filter arrangement according to the description configured in such a way that the network bridge and/or the motor bridge is a power bridge, in connection with which bridge bridges a filter circuit is connected.
  • the filter arrangement according to the description can be fitted either in connection with a network bridge or in connection with a motor bridge, or the frequency converter can comprise separate filter arrangements fitted in connection both with the network bridge and with the motor bridge. Consequently the common- mode interference connecting to the AC network, the common-mode interference connecting to the supply cables of a motor, or both, can be filtered by means of the filter arrangement.
  • a frequency converter can also be used behind residual current protection without the residual current protection triggering as a result of common-mode interference.
  • a differential-mode LCL circuit is connected to the phases of the network bridge for filtering the current of the AC voltage network. In this case common-mode interference, which the differential-mode LCL circuit is unable to filter, is filtered with the filter circuit according to the description.
  • the main circuit of the frequency converter is at a fixed voltage potential.
  • Ground leakage currents which are produced when connecting a frequency converter to a fixed voltage potential, can be filtered by means of the filtering solution according to the description.
  • the filtering solution according to the description is particularly advantageous if the zero point of the supply network of the frequency converter is permanently connected to a ground potential.
  • the elevator system comprises a hoisting machine, which is configured to drive an elevator car in response to elevator calls.
  • the elevator system also comprises a frequency converter according to the description for driving the hoisting machine. This means that the leakage currents caused by operation of the frequency converter driving the hoisting machine of the elevator can be eliminated by means of the filtering solution according to the description.
  • the electricity supply of the elevator can be connected behind residual current protection, which improves the electrical safety of the elevator.
  • the arrangement according to the invention also reduces radiated EMC interference.
  • Fig. 1 presents as a circuit diagram one frequency converter according to the invention.
  • Fig. 2 presents the connection of common-mode interference as an equivalent circuit in the frequency converter of Fig. 1.
  • Figs. 3a, 3b present circuit diagrams of alternative filter circuits for the frequency converter of Fig. 1. More detailed description of preferred embodiments of the invention
  • Fig. 1 presents as a circuit diagram a frequency converter having regenerative braking to the network.
  • This type of frequency converter can both take electric power from the electricity network and also return the electrical energy returning in connection with e.g. motor braking back to the electricity network 15.
  • This type of frequency converter can be used e.g. for driving the hoisting machine of an elevator or also for driving the drive machinery of an escalator or travelator.
  • the frequency converter is connected to the electricity network 15 and also to the supply cables of an electric motor 16 with connectors 14, 18.
  • the frequency converter comprises a network bridge 5, with which the voltage of the AC network 15 is rectified into DC voltage between the positive 2A and negative 2B busbar of the DC intermediate circuit 2 of the frequency converter.
  • the DC voltage of the DC intermediate circuit 2 is further converted by the motor bridge 6 into the variable-amplitude and variable-frequency supply voltage of the electric motor 16.
  • the network bridge 5 and the motor bridge 6 are both bi-level inverter circuits.
  • the network bridge 5 comprises for each phase LI, L2, L3 of the AC network 15 a high- side IGBT transistor 7A connected to the positive busbar 2A of the DC intermediate circuit as well as a low-side IGBT transistor 7B connected to the negative busbar 2B of the DC intermediate circuit.
  • the phase LI, L2, L3 of the AC network 15 is connected to the connection point of the aforementioned high-side 7 A and low- side 7B IGBT transistors.
  • a typical differential-mode LCL filter module 17, which filters the current of the AC network 15 and stabilizes the adjustment of the network current performed by the network bridge 5, is also connected to the phases LI, L2, L3 of the network bridge 5.
  • the motor bridge 6 comprises for each phase R, S, T of the alternating-current motor 16 a high-side IGBT transistor 8A connected to the positive busbar 2A of the DC intermediate circuit as well as a low-side IGBT transistor 8B connected to the negative busbar 2B of the DC intermediate circuit.
  • the phase R, S, T of the AC motor 16 is connected to the connection point of the aforementioned high-side 8A and low-side 8B IGBT transistors.
  • the IGBT transistors 7 A, 7B, 8 A, 8B of both the network bridge 5 and the motor bridge 6 are connected by producing with a control circuit, such as with a DSP processor, short, preferably PWM modulated, pulses in the gates of the IGBT transistors.
  • a control circuit such as with a DSP processor
  • PWM modulated pulses By connecting alternately the IGBT transistors of the high-side 7A, 8 A and of the low-side 7B, 8B, a PWM modulated pulse pattern forms from the DC voltages of the positive busbar 2A and the negative busbar 2B in the AC outputs of the network bridge 5 and of the motor bridge 6, the frequency of the pulses of which pulse pattern is essentially greater than the frequency of the fundamental frequency of the AC voltage.
  • the amplitude and frequency of the fundamental frequency of the output voltages can in this case be changed steplessly by adjusting the modulation index of the PWM modulation.
  • the neutral conductor of the three-phase AC network 15 is earthed in the supply distribution panel, in which case the main circuit of the frequency converter is in fixed contact with ground potential.
  • switching of, in particular, the IGBT transistors 7A, 7B of the network bridge 5 produces common- mode interference, which tries to travel into the AC network 15.
  • the distributed capacitance between the motor windings and the frame of the motor on the other hand, produces common-mode interference caused by the switching of the IGBT transistors 8A, 8B of the motor bridge 6, which interference travels via the distributed capacitance into the frame of the motor.
  • the common-mode interference of the network bridge 5 also tries to travel into the motor 16.
  • An unearthed common-mode filter circuit is connected between the phases LI, L2, L3 of the network bridge 5 and the negative busbar 2B of the DC intennediate circuit.
  • said filter circuit comprising, connected in series, a common-mode choke 9, star- connected filter capacitors 10 and also a resistor 12.
  • the filter circuit 9, 10, 12 could also be connected to the positive intermediate circuit busbar 2A, instead of to the negative intermediate circuit busbar 2B, or, if instead of one intermediate circuit capacitor 19 the intermediate circuit has two intermediate circuit capacitors connected in series with each other between the positive 2A and the negative 2B intermediate circuit busbar, the filter circuit 9, 10, 12 could be connected to the connection point of the aforementioned capacitors.
  • the values of the components of the filter circuit 9, 10, 12 are selected in such a way that the filter circuit forms a current path for common- mode interference from the phases LI, L2, L3 of the network bridge 5 to the negative busbar 2B of the DC voltage circuit, in which case the common-mode interference tries to convert into heat in the resistor 12 of the filter circuit.
  • a similar filter circuit 9, 10, 12 is also formed between the phases R. S, T of the motor bridge 6 and the negative intermediate circuit busbar 2B of the DC intermediate circuit.
  • the choke 9 must have, in addition to common-mode inductance, also differential-mode inductance owing to the capacitors 10 connected to the phases R, S, T of the motor bridge. Since the filter circuit 9, 10, 12 on the motor bridge 6 side is otherwise similar in its operation to the filter circuit of a network bridge 5, in the following only the operation of a filter circuit 9, 10, 12 of a network bridge 5 is described in more detail.
  • inductance of the common-mode choke 9 L capacitance of the filter capacitors 10: C resistor 12: R
  • inductance of the common-mode choke 9 1.5 mH values for the filter capacitors 10: lOuF value for resistor: 5 ⁇ .
  • Figs. 3a and 3b present some alternative circuit diagrams of the filter circuit, which are suited for use in the frequency converter of Fig. 1.
  • the filter circuit of Fig. 3a differs from the filter circuit of Fig. 1 in that the filter circuit has three resistors 12, every other pole of which resistors is connected to a filter capacitor 10 and every other pole is connected together with the other resistors 12 into a neutral point 13.
  • the resistors 12 also damp the differential- mode resonances of the filter circuit.
  • the values of the components are selected as follows: filter capacitor 10: 10 uF resistor 12: 15 ⁇ common-mode choke 9: 1.5 mH in which case UCM damping of 16 decibel common-mode voltage is achieved with the circuit at a frequency of 10 kilohertz.
  • the filter circuit also damps a current of 10 kilohertz frequency flowing in the filter circuit with 30 decibel damping as well as a current of 150 hertz frequency with 30 decibel damping.
  • the filter circuit comprises three filter capacitors 10 star-connected with each other, every other pole of which filter capacitors is connected to a different phase LI, L2, L3 of the network bridge 5 and every other pole is connected together with the other filter capacitors 10 into a neutral point 13.
  • the neutral point 13 is connected to the negative busbar 2B of the DC intermediate circuit.
  • the filter circuit also comprises a common-mode choke 9, which is connected in series with the filter capacitors 10.
  • the resonance frequency of the filter circuits of Fig. 1 and Fig. 3a is adjusted to one kilohertz.
  • the filter circuit of Fig. 3b differs from the filter circuits of Fig. 1 and Fig.
  • the filter circuit of Fig. 3b does not have a resistor 12 damping the resonances. Consequently the resonance frequency of the filter circuit of Fig. 3b must be selected in such a way that no resonance frequency excitations occur in the system.
  • the resonance frequency of the filter circuit of Fig. 3b can be selected e.g. to be significantly higher than the filter circuits of Fig. I and of Fig. 3a, e.g. to be approx.
  • the filter circuit of Fig. 3b is not, of course, suited to filtering switching-frequency interference of 10 kilohertz, but the filter circuit can be used for filtering higher- frequency EMC interference.
  • the switching frequency of the IGBT transistors 7A, 7B of the network bridge is 10 kilohertz
  • the switching frequency of the IGBT transistors 8 A, 8B of the motor bridge is 3.5 kilohertz, so that when dimensioning the components 9, 10, 11, 12 of the filter circuit of a motor bridge, the values of the filter components must change the change in switching frequency.
  • MOSFET transistors e.g. MOSFET transistors, bipolar transistors or corresponding components can be used, instead of IGBT transistors, as the controllable switches 7A, 7B, 8A, 8B of the network bridge 5 and of the motor bridge 6.
  • network-bridge- side common-mode choke 9 of the filter circuit could also be connected between the LCL circuit 17 and the network bridge 5, or between the chokes in the center of the LCL circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

L'invention porte sur un agencement pour filtrer un brouillage de mode commun. L'agencement comprend un pont de puissance (5, 6) connecté entre un circuit de tension à courant alternatif (CA) (1, 4) et un circuit de tension à courant continu (CC) (2), ledit pont de puissance comprenant des commutateurs commandables (7A, 7B, 8A, 8B) pour fournir une puissance électrique entre le circuit de tension CA (1, 4) et le circuit de tension CC (2). L'agencement comprend en outre un circuit de filtre de mode commun non relié à la terre (9, 10, 12), ledit circuit de filtre étant connecté entre le circuit de tension CA (1, 4) susmentionné et le circuit de tension CC (2) susmentionné, en connexion avec le pont de puissance (5, 6).
EP13878495.4A 2013-03-13 2013-03-27 Agencement, convertisseur de fréquence et système élévateur Withdrawn EP2973964A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20135245 2013-03-13
PCT/FI2013/050344 WO2014140414A1 (fr) 2013-03-13 2013-03-27 Agencement, convertisseur de fréquence et système élévateur

Publications (2)

Publication Number Publication Date
EP2973964A1 true EP2973964A1 (fr) 2016-01-20
EP2973964A4 EP2973964A4 (fr) 2016-12-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13878495.4A Withdrawn EP2973964A4 (fr) 2013-03-13 2013-03-27 Agencement, convertisseur de fréquence et système élévateur

Country Status (2)

Country Link
EP (1) EP2973964A4 (fr)
WO (1) WO2014140414A1 (fr)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN107968435A (zh) * 2017-12-15 2018-04-27 远景能源（江苏）有限公司 风力发电双绕组发电机系统共模电压抑制方法
CN109981026A (zh) * 2019-04-20 2019-07-05 江苏驭创高铁节能科技有限公司 一种石油钻机用带电压可调整四象限变频器

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DE102015013671A1 (de) * 2015-10-23 2017-04-27 Sew-Eurodrive Gmbh & Co Kg Anlage, aufweisend ein Netz einen Filter und einen oder mehrere Antriebe
CN107196573B (zh) * 2017-06-07 2019-10-11 东南大学 基于五相开绕组ftfscw-ipm电机驱动系统的零序电流抑制方法
DE102017123758A1 (de) * 2017-10-12 2019-04-18 Schaffner International AG Umrichter mit Gleichtaktfilter
CN109532536A (zh) * 2018-11-23 2019-03-29 中车工业研究院有限公司 一种牵引传动系统拓扑结构

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JP2863833B2 (ja) * 1996-09-18 1999-03-03 岡山大学長 アクティブコモンモードキャンセラ
US6122184A (en) * 1997-06-19 2000-09-19 The Texas A&M University System Method and system for an improved converter output filter for an induction drive system
DE19736786A1 (de) * 1997-08-23 1999-02-25 Asea Brown Boveri U-Umrichter
JP3393374B2 (ja) * 1999-09-14 2003-04-07 株式会社日立製作所 電力変換システム
DE10310577A1 (de) * 2003-03-11 2004-09-30 Siemens Ag Nullspannungsfilter für Umrichter mit selbstgeführtem Netzstromrichter (AFE) und Gleichspannungszwischenkreis
DE602006015897D1 (de) * 2006-01-23 2010-09-16 Abb Oy Verfahren zum Starten von Pulsbreitmodulation
US8115444B2 (en) * 2006-05-31 2012-02-14 Honeywell International, Inc. Common mode filter for motor controllers
JP4968689B2 (ja) * 2008-03-12 2012-07-04 東芝エレベータ株式会社 エレベータの漏洩電流低減装置
EP2113928A1 (fr) * 2008-04-28 2009-11-04 ABB Oy Structure de filtre d'inverseur
US8411472B2 (en) * 2008-07-30 2013-04-02 Toshiba Mitsubishi-Electric Industrial Systems Corporation Power conversion device
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Publication number Priority date Publication date Assignee Title
CN107968435A (zh) * 2017-12-15 2018-04-27 远景能源（江苏）有限公司 风力发电双绕组发电机系统共模电压抑制方法
CN109981026A (zh) * 2019-04-20 2019-07-05 江苏驭创高铁节能科技有限公司 一种石油钻机用带电压可调整四象限变频器

Also Published As

Publication number Publication date
EP2973964A4 (fr) 2016-12-14
WO2014140414A1 (fr) 2014-09-18

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