WO2014048471A1 - Dispositif filtre de ligne électrique - Google Patents

Dispositif filtre de ligne électrique Download PDF

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Publication number
WO2014048471A1
WO2014048471A1 PCT/EP2012/069006 EP2012069006W WO2014048471A1 WO 2014048471 A1 WO2014048471 A1 WO 2014048471A1 EP 2012069006 W EP2012069006 W EP 2012069006W WO 2014048471 A1 WO2014048471 A1 WO 2014048471A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
filtering device
power network
emc filtering
filter
Prior art date
Application number
PCT/EP2012/069006
Other languages
English (en)
Inventor
Andrew Cecil Tucker
Original Assignee
Schaffner Emv Ag
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 Schaffner Emv Ag filed Critical Schaffner Emv Ag
Priority to PCT/EP2012/069006 priority Critical patent/WO2014048471A1/fr
Publication of WO2014048471A1 publication Critical patent/WO2014048471A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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

Definitions

  • the present invention is directed to power line filters. More specifically, the present invention relates to both ac and dc power line filters connectable between an ac or dc power supply network and an electrically operated appliance.
  • the power line filters are low pass filters having passive LC components that provide attenuation of incoming and outgoing line disturbances over a wide band of frequencies in both common mode and differential modes.
  • Fig. 1 illustrates a possible implementation of a power line filters as currently know in the art.
  • a multiphase power line for example a three-phase AC line whose phases L1 , L2, L3 are connected to the corresponding terminals at the left side of the filter, and a load that is connected to the L1 ', L2' L3' terminals at the right side of the filter.
  • a multiphase power line for example a three-phase AC line whose phases L1 , L2, L3 are connected to the corresponding terminals at the left side of the filter, and a load that is connected to the L1 ', L2' L3' terminals at the right side of the filter.
  • the purpose of the filter is to prevent noise signals generated in the load from being conducted to the line side and disturbing other equipments.
  • the system usually, but not necessarily, includes a protective earth PE, PE'.
  • the load connected to the power line may be an inverter-driven electric motor, but any other appliance is contemplated to be connected to the line.
  • Inverter-driven motors, but also other appliances, are known to produce undesirable harmonic noise, switching pulses, spikes, and high frequency noise of various origins. All these undesirable effects induced by the appliance connected to the load need to be filtered out to meet the relevant specifications and norms for electromagnetic
  • the passive filter of figure 1 is configured as a low-pass 'L' filter having an inductance 1 14, and two arrangements of capacitors 108, 109, but other arrangements are possible.
  • Passive filters like that presented in fig. 1 have a plurality of limitations. In particular, they offer high attenuation with respect to noise only at frequencies considerably higher than the corner frequency of the filter. The low-frequency filtering performance of the circuitry may be improved by lowering the corner frequency, but this requires larger chokes and capacitors. In particular, in the filter of fig. 1 , higher attenuation of common-mode interferences at medium and low frequency requires an increase of the choke size and of the earth-connected capacitor 109a. Such measures, however, add to the cost and size of the filter, and may also worsen its leakage current.
  • EMC filters comprising active components are also known, for example as presented in document WO09046762 in the name of applicant.
  • Such active filters usually replace one or more of the capacitors with an active circuit that presents low impedance in the frequency bands where noise is present, effectively functioning as a large-value capacitors, without all the shortcomings described above.
  • Active filters can be more compact than passive filters of equivalent attenuation, but they are not necessarily cheaper.
  • Active circuits are moreover perceived as less reliable than passive ones .
  • Wideband circuits in particular, can have stability problems and may in some case oscillate due to improper dimensioning, tolerances or unexpected conditions.
  • the magnitude and frequency attenuation obtained by employing passive filters is dependent on the value of the passive LC components used, while the size of these components is related to the desired attenuation at target frequencies.
  • the value of the earth connected capacitance, the so called Y capacitance is limited in order to reduce the magnitude of earth leakage current.
  • the present invention proposes a novel configuration for a power line filtering device that is connectable between a power network and an electrically operated appliance, and that is configured as recited in claim 1 , and in the subsequent claims.
  • a filtering device connectable between a power network and an electrically operated appliance, wherein the power network comprises at least one passive filter, the filtering device comprising a current sensor and an amplifier coupled to a supply side of the passive filter, and a current transformer controlling the amplifier, wherein the amplifier is capable of injecting a common mode correction current onto the power network so that a common mode noise current on a supply side of the power network is reduced.
  • the power network is one of a dc power line, an ac power line, a single phase power line, and a multiple phase power line.
  • the amplifier is connected with the current transformer such that the injected common- mode current cancels as closely as possible in amplitude and phase the noise current measured by the current transformer.
  • the amplifier is connected in a feed-forward control loop, and by this measure it is capable of imparting high stability to the filtering device.
  • Fig. 1 illustrates a power line implementation of filters as currently know in the art
  • Fig. 2 schematically illustrates, in a simplified single line
  • FIG. 3 schematically illustrates the functional blocks of the active part of the filter device proposed in accordance with the present invention and depicts the principle of operation that stands behind the functioning of the filter of the present invention
  • Fig 4 is a schematic diagram of a filter according to the present invention.
  • Fig. 5 illustrates a simplified power line model.
  • the present invention is directed to a filter for electromagnetic compatibility and in particular, it is related to a filter that is usable in connection with either AC or DC power lines.
  • the filter may be inserted between a power line and an appliance that is likely to produce
  • the power line may be a 400 volt, 3 phase power conventional power line and the appliance, a motor with an inverter.
  • the filter of the invention presents a hybrid structure in that it can be regarded, functionally, as a passive filter 30, for example of 'L' configuration, or another suitable arrangement, followed by an active circuit 40.
  • the filter is terminated in common mode voltages and
  • the filter is hybrid in the sense that the conventional passive LC filter 30 combined with active filter means 40 provide together a broad frequency bandwidth filter.
  • the passive filter 30 is placed on the load-side of the filter, interfacing with the load which generates a high level of switching noise.
  • the active means is placed on the supply-side of the filter, interfacing with the ac power line.
  • the passive filter provides pre-filtering of the switching noise of the load. This disposition reduces the current dynamic, frequency bandwidth and power dissipation required by the active means.
  • the passive filter 30 is so dimensioned as to attenuates frequencies above a transition frequency that may be set, for example, at 100kHz, while the active means 40 attenuates frequencies below the transition frequency.
  • a hybrid filter involving the combination of an active and a passive filter means can result in a smaller and lower cost product than either an active or passive means alone.
  • the band pass filter 406 can have any suitable topology and defines the frequency range of the active means 40, essentially between a lower corner frequency of the band pass filter and a higher frequency of the band pass filter.
  • Figure 4 shows a simplified schematic of one possible realization of the hybrid filter including passive filter with active means employing a unity gain feed forward control loop.
  • the current transformer 1 10 generates a secondary current that is proportional to the common-mode current I n with a determined turn ratio, for example of 100.
  • the secondary of the current transformer is connected by an RC network acting as band-pass filter to the input to a controlled current source based on the amplifier 306.
  • the variable source is here implemented with an amplifier 306 connected as a unity-gain buffer, and pulling a current / 0 across the resistor Rf but it can be realized in any suitable way.
  • An auxiliary dc power supply 1 18 is required to energize the amplifier 306.
  • the amplifier 306 is protected internally from over voltage with a voltage clamping device such as a varistor 437.
  • the power supply is dimensioned to replace the power dissipated from the losses in the amplifier.
  • the filter could be implemented to include an automatic gain control amplifier (AGC) to adjust the loop current gain to unity in the operative frequency band of the filter. This would involve monitoring the current at l 0 or l s in addition to l n . The envelope of the current signals would be compared and the necessary adjustment to the gain accordingly. The time response of the ACG can be much slower than the filter response [0030] If needed, the filter can be dimensioned as to include the mains frequency of 50 Hz or 60 Hz in the attenuation band. In this manner the filter can effectively suppress leakage current (that is essentially a common- mode current) at mains frequency.
  • ACG automatic gain control amplifier
  • the control loop band pass filter should be configured with a suitably sharp low end frequency roll-off so that the active means does not generate a power frequency (50/60Hz) compensation current. This is done for safety reasons so that a Residual Current Detection (RCD) device connected on the supply side remains sensitive to power frequency earth leakage current.
  • RCD Residual Current Detection
  • the active means can still be made to attenuate harmonics of the power frequency currents such as the 3 rd harmonic (1 50/180Hz) which can be prevalent in the common mode.
  • Figure 5 depicts the open loop current gain of the active means where Z s and Z n represent the common mode impedances on the supply and load side of the active means respectively.
  • Z s and Z n represent the common mode impedances on the supply and load side of the active means respectively.
  • Unity gain feed forward control provides superior reliability compared to an alternative feedback control method which can be unstable due to high open loop gain.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Conversion In General (AREA)

Abstract

La présente invention concerne un dispositif de filtrage pouvant être raccordé entre un réseau électrique et un appareil électrique, le réseau électrique comprenant au moins un filtre passif (30), le dispositif de filtrage comprenant un capteur de courant (110) et un amplificateur (202) accouplés à un côté alimentation dudit filtre passif (30), et un transformateur de courant (110) commandant l'amplificateur (202), l'amplificateur (202) étant capable d'injecter un courant de perturbation de mode commun sur le réseau électrique de façon à réduire un courant de perturbation de mode commun sur un côté alimentation du réseau électrique.
PCT/EP2012/069006 2012-09-26 2012-09-26 Dispositif filtre de ligne électrique WO2014048471A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/069006 WO2014048471A1 (fr) 2012-09-26 2012-09-26 Dispositif filtre de ligne électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/069006 WO2014048471A1 (fr) 2012-09-26 2012-09-26 Dispositif filtre de ligne électrique

Publications (1)

Publication Number Publication Date
WO2014048471A1 true WO2014048471A1 (fr) 2014-04-03

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2945268A1 (fr) 2014-05-12 2015-11-18 Epcos Ag Dispositif de filtre actif et agencement de circuit comprenant un tel dispositif
CN105634254A (zh) * 2014-11-21 2016-06-01 通用电气能源能量变换技术有限公司 用于统一共模电压注入的系统和方法
EP3035511A1 (fr) * 2014-12-19 2016-06-22 ABB Technology AG Procédé d'amortissement d'un composant de résonance de courant en mode commun de convertisseur d'alimentation multiphase
WO2016173229A1 (fr) * 2015-04-27 2016-11-03 华为技术有限公司 Filtre et système d'alimentation électrique
JPWO2018109801A1 (ja) * 2016-12-12 2019-06-27 三菱電機株式会社 電力変換装置
DE102018103438A1 (de) * 2018-02-15 2019-08-22 Tdk Electronics Ag Kompensationsfilter und Verfahren zur Inbetriebnahme eines Kompensationsfilters
DE102018103391A1 (de) * 2018-02-15 2019-08-22 Tdk Electronics Ag Kompensationsfilter und Verfahren zur Inbetriebnahme eines Kompensationsfilters
DE102019129413A1 (de) * 2019-10-31 2021-05-06 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kompensationsvorrichtung für Ableitströme
US11515780B2 (en) 2018-01-31 2022-11-29 Tdk Electronics Ag Machines having power-electronic energy converters and leakage current compensation and system
CN111937284B (zh) * 2018-02-15 2024-07-02 Tdk电子股份有限公司 补偿滤波器和用于启动补偿滤波器的方法

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WO2009046762A1 (fr) 2007-10-10 2009-04-16 Schaffner Emv Ag Filtre emc
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US20090121805A1 (en) * 2006-08-15 2009-05-14 Schaffner Emv Ag Low-leakage emc filter
WO2009046762A1 (fr) 2007-10-10 2009-04-16 Schaffner Emv Ag Filtre emc

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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106464125A (zh) * 2014-05-12 2017-02-22 埃普科斯股份有限公司 有源滤波器装置和包括有源滤波器装置的电路布置
WO2015173006A1 (fr) * 2014-05-12 2015-11-19 Epcos Ag Dispositif de filtre actif et agencement de circuit comprenant un dispositif de filtre actif
EP2945268A1 (fr) 2014-05-12 2015-11-18 Epcos Ag Dispositif de filtre actif et agencement de circuit comprenant un tel dispositif
US10069480B2 (en) 2014-05-12 2018-09-04 Epcos Ag Active filter device and circuit arrangement comprising an active filter device
JP2017516446A (ja) * 2014-05-12 2017-06-15 エプコス アーゲーＥｐｃｏｓ Ａｇ アクティブフィルタ装置及びアクティブフィルタ装置を備える回路アセンブリ
CN105634254A (zh) * 2014-11-21 2016-06-01 通用电气能源能量变换技术有限公司 用于统一共模电压注入的系统和方法
EP3035511A1 (fr) * 2014-12-19 2016-06-22 ABB Technology AG Procédé d'amortissement d'un composant de résonance de courant en mode commun de convertisseur d'alimentation multiphase
US9843266B2 (en) 2014-12-19 2017-12-12 Abb Schweiz Ag Method for damping resonant component of common-mode current of multi-phase power converter
CN105720804B (zh) * 2014-12-19 2018-06-22 Abb瑞士股份有限公司 用于使多相电力转换器的共模电流的谐振分量衰减的方法
CN105720804A (zh) * 2014-12-19 2016-06-29 Abb技术有限公司 用于使多相电力转换器的共模电流的谐振分量衰减的方法
WO2016173229A1 (fr) * 2015-04-27 2016-11-03 华为技术有限公司 Filtre et système d'alimentation électrique
US10447225B2 (en) 2015-04-27 2019-10-15 Huawei Technologies Co., Ltd. Filter apparatus and power supply system
JPWO2018109801A1 (ja) * 2016-12-12 2019-06-27 三菱電機株式会社 電力変換装置
US10700625B2 (en) 2016-12-12 2020-06-30 Mitsubishi Electric Corporation Power conversion device
US11515780B2 (en) 2018-01-31 2022-11-29 Tdk Electronics Ag Machines having power-electronic energy converters and leakage current compensation and system
DE102018103438A1 (de) * 2018-02-15 2019-08-22 Tdk Electronics Ag Kompensationsfilter und Verfahren zur Inbetriebnahme eines Kompensationsfilters
CN111937283A (zh) * 2018-02-15 2020-11-13 Tdk电子股份有限公司 补偿滤波器和用于启动补偿滤波器的方法
CN111937284A (zh) * 2018-02-15 2020-11-13 Tdk电子股份有限公司 补偿滤波器和用于启动补偿滤波器的方法
US20210006235A1 (en) * 2018-02-15 2021-01-07 Tdk Electronics Ag Compensation Filter and Method for Activating a Compensation Filter
US11245325B2 (en) 2018-02-15 2022-02-08 Tdk Electronics Ag Compensation filter and method for activating a compensation filter
EP3753093B1 (fr) * 2018-02-15 2022-09-14 TDK Electronics AG Filtre de compensation et procédé de mise en service d'un filtre de compensation
DE102018103391A1 (de) * 2018-02-15 2019-08-22 Tdk Electronics Ag Kompensationsfilter und Verfahren zur Inbetriebnahme eines Kompensationsfilters
CN111937284B (zh) * 2018-02-15 2024-07-02 Tdk电子股份有限公司 补偿滤波器和用于启动补偿滤波器的方法
DE102019129413A1 (de) * 2019-10-31 2021-05-06 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kompensationsvorrichtung für Ableitströme
DE102019129413B4 (de) 2019-10-31 2021-10-07 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kompensationsvorrichtung für Ableitströme
US11186179B2 (en) 2019-10-31 2021-11-30 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Compensation apparatus for leakage currents

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