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EP3072143A1 - Dispositif de commutation d'un courant continu - Google Patents

Dispositif de commutation d'un courant continu

Info

Publication number
EP3072143A1
EP3072143A1 EP14703039.9A EP14703039A EP3072143A1 EP 3072143 A1 EP3072143 A1 EP 3072143A1 EP 14703039 A EP14703039 A EP 14703039A EP 3072143 A1 EP3072143 A1 EP 3072143A1
Authority
EP
European Patent Office
Prior art keywords
commutation
current
current path
transformer
winding
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.)
Granted
Application number
EP14703039.9A
Other languages
German (de)
English (en)
Other versions
EP3072143B1 (fr
Inventor
Jörg DORN
Dominik ERGIN
Herbert Gambach
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Priority to PL14703039T priority Critical patent/PL3072143T3/pl
Publication of EP3072143A1 publication Critical patent/EP3072143A1/fr
Application granted granted Critical
Publication of EP3072143B1 publication Critical patent/EP3072143B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
    • H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for interrupting dc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/541—Contacts shunted by semiconductor devices
    • H01H9/542—Contacts shunted by static switch means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/541—Contacts shunted by semiconductor devices
    • H01H9/542—Contacts shunted by static switch means
    • H01H2009/544—Contacts shunted by static switch means the static switching means being an insulated gate bipolar transistor, e.g. IGBT, Darlington configuration of FET and bipolar transistor

Definitions

  • the invention relates to a device for switching a direct current with an operating current path having a mechanical switch, a shutdown current path in parallel with the operating current path, which has a power electronic switch, and a commutation device which commutates the direct current from the Operating current path in the Abschaltstrom path allows.
  • the invention relates to a method for switching off a direct current in such a device.
  • a device of the type mentioned is known from international patent application WO 2013/131582 AI.
  • the commutation device has a series connection of two-pole submodules, wherein each submodule has an energy store and a power semiconductor circuit.
  • a charging branch is provided, which connects the high voltage potential Abschaltstrompfad with ground potential.
  • the power supply of the commutation device requires considerable effort here.
  • the invention has for its object to provide an apparatus and a method with which direct currents can be safely switched in a simple and cost-effective manner. This object is achieved by a device according to claim 1 and by a method according to claim 12. Advantageous embodiments of the device and the method are specified in the dependent claims.
  • a device for switching a direct current with an operating current path which has a mechanical switch, parallel to the operating current path.
  • switched off Abschaltstrom path which has a power electronic switch
  • a commutation device which allows a commutation of the direct current from the operating current path in the Abschaltstrompfad
  • the commutation device comprises a transformer. It is particularly advantageous that the commutation of the direct current from the operating current path into the Abschaltstrompfad by means of a transformer.
  • the device may be configured such that the transformer has a first winding and a second winding, which are galvanically isolated. As a result, galvanic isolation is advantageously achieved so that the switch-off current path is galvanically isolated from the other units connected to the transformer.
  • the device can also be configured such that a high-voltage resistant electrical insulation is arranged between the first winding and the second winding of the transformer.
  • a large potential difference between the Abschaltstrompfad and the other units connected to the transformer can be realized.
  • the device may also be configured so that the Abschaltstrompfad comprises a series circuit of the second winding of the transformer and the power electronic switch. This embodiment advantageously makes it possible to introduce a commutation voltage into the turn-off current path by means of the second winding of the transformer.
  • the device can also be designed such that the first winding of the transformer is connected to a supply unit, by means of which the voltage occurring at the second winding of the transformer can be influenced, in particular adjusted.
  • the voltage occurring at the second winding of the transformer can be influenced, in particular adjusted.
  • the device can advantageously also be designed such that the feed unit has an inverter.
  • Transformers occurring voltage can be influenced or adjusted within wide limits.
  • the device can also be configured such that the feed unit has an energy store, in particular a capacitor.
  • a feed unit with such an energy store advantageously enables energy self-sufficient operation of the device. This is particularly advantageous, for example, in the event of a power failure in a DC high-voltage network to which the device is connected.
  • the device can be configured such that the energy store is set up to store the electrical energy necessary for the commutation.
  • the electrical capacity of the energy store is chosen in particular such that the energy store stores a sufficiently large electrical energy in order to carry out the complete commutation process.
  • the device may also be designed such that the power electronic switch is designed to conduct the direct current in both directions and to switch off such a direct current (ie to switch off direct current flowing in both directions). This makes it possible to switch off a direct current with the device which flows in one direction in the operating current path. If required, however, the device can also switch off a direct current which flows in the opposite direction in the operating current path.
  • the device can be constructed so that the power electronic switch has an antiserial circuit of a plurality of switching modules. In this case, each switching module may have a switching element and a diode connected in antiparallel.
  • the switching element may in particular be a power semiconductor switch.
  • the device can also be configured such that the operating current path and the cut-off current path have high-voltage potential, and the first winding of the transformer and the feed unit have low-voltage potential.
  • the first winding of the transformer and the feed unit may be connected to ground potential. This advantageously makes it possible to use the device in high-voltage direct current networks in order to switch off direct currents in branches of these high-voltage direct current networks.
  • Disclosed is still a method for switching off a direct current in a device with
  • a commutation device which allows a commutation of the direct current from the operating current path in the Abschaltstrompfad and having a transformer, wherein in the method
  • a commutation voltage is introduced (impressed) into the turn-off current path by means of the transformer
  • a commutation current flowing through the cutoff current path and the operating current path is generated due to the commutation voltage, wherein the commutation current in the operating current path is opposite to the direct current, - is reduced due to the commutation of the current flowing through the operating current path current, and
  • the mechanical switch is opened. It is particularly advantageous that the commutation voltage is introduced into the Abschaltstrompfad means of the transformer. This allows the introduction of the commutation voltage in the Abschaltstrompfad at a realized by means of the transformer galvanic separation, in particular in a full potential separation.
  • the device may be constructed according to all the variants given above.
  • the method may be configured such that the mechanical switch is only opened when a characteristic of the current flowing through the operating current path falls below a predetermined threshold value.
  • the mechanical switch can only be opened when the current intensity of the current flowing through the operating current path falls below a predetermined threshold value.
  • Such a parameter may be, for example, a measured value i (t) of the current flowing through the operating current path, an average value of the measured current during a predetermined time interval or another current-related value.
  • the mechanical switch is not opened until the current flowing through the operating current path has reached zero. Then arises when opening the mechanical switch no arc.
  • the mechanical switch can already be opened when the current flowing through the operating current path falls below a predetermined (small) threshold value. Due to the low current that still flows, a (small) arc will occur in the mechanical switch, but this is harmless if the switch has a suitable arc resistance.
  • the method may also be such that (after the mechanical switch is opened) the current flowing through the turn-off current path is turned off by means of the power electronics switch.
  • the direct current commutated by the operating current path into the turn-off current path is cut off by means of the power electronic switch, whereby a rapid shutdown of the direct current is possible.
  • the method may also be implemented so that the operating current path and the Abschaltstromform are operated at high voltage potential, and the first winding of the transformer and the supply unit are operated at low voltage potential, in particular connected to ground potential.
  • the method also has the advantages indicated above in connection with the device.
  • Switching modules in Figure 5 shows another embodiment of a power electronic switch with multiple switching modules and in Figure 6, an embodiment of a switching module, which is designed as a brake actuator module shown.
  • the device 1 shows an embodiment of a device 1 for switching a direct current Ii is shown.
  • This device 1 may also be referred to as a DC switch 1.
  • the device 1 has a first terminal 3, which is electrically connected to an operating current path 5.
  • the operating current path has a mechanical switch 7, whose one contact with the first terminal 3 and whose other contact with a second terminal 9 is electrically connected.
  • the first terminal 3 is connected to a first conductor 11 of a high voltage, not shown
  • the second terminal 9 is connected to a second conductor 13 of this high voltage Gleichstromnet- zes.
  • the mechanical switch 7 is closed.
  • the mechanical switch 7 is shown in the open state in the figure, in the description below it is assumed that the mechanical switch (in contrast to the illustration in Figure 1) is closed.
  • the electrical direct current Ii flows from the first conductor 11 via the first terminal 3, the closed mechanical switch 7 of the operating current path 5 and the second terminal 9 to the second conductor 13.
  • the mechanical switch 7 has a very low contact resistance Consequently, occur during the flow of current through the mechanical switch 7 only small electrical losses. Therefore, the device 1 is able to conduct the electrical current in the on state with only small electrical leakage losses.
  • the device 1 also has a turn-off current path 15, which is connected in parallel with the operating current path 5.
  • This Abschaltstrompfad 15 is realized in the embodiment as an electrical series circuit of a power electronic switch 17 and a second winding 19 of a transformer 21.
  • a first winding 23 of the transformer 21 is connected to a feeding unit 25
  • the transformer 21 and the feeder unit 25 form a commutation device.
  • the first winding 23 of the transformer 21 is the primary winding
  • the second winding 19 of the transformer 21 is the secondary winding.
  • the first winding 23 and the second winding 19 are galvanically isolated, between the first winding 23 and the second winding 19 is a high-voltage resistant electrical insulation 27 is arranged.
  • the feed unit 25 and the second winding 19 can be realized at a completely different electrical potential.
  • the potential of the second winding 19 (as well as the potential of the mechanical switch 7, the power electronic switch 17, the first terminal 3 and the second terminal 9) can be configured as high-voltage potential 29, while the first winding 23 and the feed unit 25
  • Low-voltage potential 31 have. It is particularly advantageous that the power supply of the supply unit 25 can be made to low-voltage potential 31, whereby an expensive and complex energy supply to high-voltage potential 29 is unnecessary. Furthermore, it is advantageous that the control of elements of the supply unit with low-voltage potential 31 can also take place.
  • the power electronics of the supply unit 25 can thereby also be realized at low-voltage potential or ground potential. So it is only a small amount of insulation for the feed unit 25 is necessary, since this is at low voltage potential or ground potential.
  • the feeding unit 25 generates an electric voltage which is applied to the first winding 23 of the transformer 21. As a result, the supply unit is able to influence the voltage occurring at the second winding 19 of the transformer as a result of the induction.
  • the supply unit 25 and the transformer 21 thus serve to introduce into the Abschaltrompfad 15 a voltage which serves as a commutation voltage.
  • This commutation voltage is shown in FIG. 1 with a voltage arrow Uk.
  • the electrical circuit with the mechanical switch 7, the power electronic switch 17 and the transformer 21 form a commutation loop of the device 1.
  • the introduction of the commutation Uk in the Abschaltstrompfad 15 allows active commutation, ie the active initiation of the commutation by means of the commutation Uk ,
  • the mechanical switch 7 and the power electronic switch 17 are closed (switched on).
  • the direct current Ii flows almost completely through the operating current path 5 via the mechanical switch 7, because the mechanical switch 7 has a much lower through-resistance than the power electronic switch 17. If the direct current Ii is to be switched off by means of the device 1, then this is not possible only at a high direct current Ii, that the mechanical switch 7 is opened. When switching off a high current Ii alone by means of the mechanical switch 7 namely an arc would arise in the mechanical switch 7, which could damage or destroy it.
  • a commutation current Ik flows in the commutation loop (ie in the loop formed by the operating current path 5 and the disconnection current path 15).
  • This commutation current Ik is directed opposite to the current Ii to be disconnected in the operating current path.
  • the direct current in the operating current path 5 is reduced.
  • the mechanical switch 7 is opened.
  • a characteristic of the direct current Ii can be, for example, the instantaneous value i (t) of the current Ii, which is measured in the operating current path.
  • the mechanical switch 7 is not opened until the DC current Ii flowing through the mechanical switch 7 has reached zero. In this case arises in the mechanical
  • the mechanical switch 7 can also be opened already when the direct current Ii flowing through the mechanical switch 7 has assumed a small value (for example when the direct current Ii falls below the value of 100A). In this case, while opening the mechanical switch 7 creates an arc. In a corresponding arc-resistant design of the mechanical switch 7 but this is not damaged by this (weak) arc.
  • the insulating path of the mechanical switch 7 can absorb voltage. In turn, as the DC current Ii flowing through the operating current path becomes smaller and smaller through the commutation current Ik, the DC current flowing through the cut-off current path 15 becomes larger and larger.
  • FIG. 2 shows the device 1 of FIG. 1 with further details. It can be seen that the power electronic switch 17 a plurality of series connected
  • Switching modules 210 which in each case a Abieiter 213 is connected in parallel.
  • the Abieiter can be configured for example as a metal oxide varistor. Such metal oxide varistors have a particularly advantageous characteristic.
  • the Abieiter serves to absorb or convert the switching energy occurring during switch-off. In addition, the serves
  • Abieiter 213 each to protect the switching module 210 from overvoltage peaks.
  • the power electronic switch 17 can also be realized in such a way that it has only one switching module 210 with a parallel connected absorber 213. Then this is a switching module designed such a voltage-resistant that this switching module can accommodate the complete voltage applied to the power electronic switch 17 voltage. However, if the power electronic switch 17 - as shown in Figure 2 - has several series-connected switching modules 210, then divides the voltage to be switched on the individual switching modules, so that these switching modules 210 each have to absorb only a lower dielectric strength. As a result, inexpensive switching modules can be used with a lower permissible switching voltage.
  • the feed unit 25 has an inverter 228 and an energy store 230.
  • the energy storage 230 may, for example, as a Capacitor 230 may be configured.
  • the energy store 230 stores the electrical energy required for commutating the direct current Ii.
  • the energy storage device 230 can be supplied with electrical energy, for example, from a conventional low-voltage network, for example a 380 volt alternating current network. If the energy storage device 230 is charged, then it allows an energy-autonomous operation of the device 1 even in the event that the power supply 230 supplying power supply network should fail.
  • the inverter 228 is used to feed the transformer 21.
  • a converter 228, a conventional, known in the art inverter can be used, for example, constructed in a bridge circuit inverter.
  • the circuit of the inverter 228 can therefore be designed differently, it can be used here, for example, standard converter, which for industrial drives for various
  • the primary current flowing through the first winding 23 of the transformer 21 can be controlled within wide limits. This makes it possible to control the commutation specifically.
  • a DC voltage can be applied.
  • the commutation current Ik is (at least for a short time) also designed as a linearly increasing current.
  • an alternating voltage can be applied to the first winding 23 of the transformer 21 by means of the converter 228.
  • an alternating voltage is induced in the second winding 19. Due to this alternating voltage, the commutation current Ik flows in the commutation loop.
  • a current sensor 233 is shown in FIG. 2, which measures the current flowing through the operating current path 5 (and thus the current flowing through the mechanical switch 7) with the formation of current measured values.
  • the current sensor 233 transmits these current measured values to a controller 235, which evaluates the current measured values.
  • the controller 235 detects that a characteristic of the current Ii flowing through the operating current path 5 falls below a predetermined threshold value, it issues an opening command to the mechanical switch 7. Later (when the mechanical switch 7 is open), the controller 235 issues In addition, an opening command to the electronic power switch 17.
  • the controller 235 also drive the inverter 228, so that it outputs a corresponding voltage to the first winding 23 of the transformer 21 for initiating the commutation process.
  • the controller 235 thus controls the entire shutdown of the DC current Ii. It is advantageous that due to the galvanic
  • Isolation / electrical isolation of the transformer it is also possible to control the power electronic converter 228 with low-voltage potential and not with high-voltage potential. voltage potential.
  • a galvanic isolation between the energy store 230 and the commutation loop 7, 17, 19 is advantageously achieved by means of the transformer. As a result, the energy store 230 can be supplied / charged with electrical energy very easily and with little effort.
  • FIG. 3 shows by way of example how a switching module 210 can be constructed.
  • FIG. 3 shows a very simply constructed switching module 210 which consists only of a switching element 311 and a freewheeling diode 312 connected in antiparallel.
  • a switching element 311 can be used, for example, on and off power semiconductor switch 311. As switching element 311 can thereby
  • a variety of power semiconductor devices are used, for example, a power transistor, an IGBT
  • insulated-gate bipolar transistor or a GTO (gate turn-off thyristor).
  • the power electronic switch 17 has a plurality of switching modules 210, which are constructed similar to the switching module shown in Figure 2.
  • the number of switching modules is variable and can according to the height of the voltage applied to the switch 17
  • the switching modules 210 are connected in series (series connection of the switching modules 210), wherein all switching modules have the same polarity / polarity. For each switching module 210, a collector 213 is connected in parallel. By means of this power electronic switch 17, a direct current flowing in one direction can be switched off.
  • This Power electronic switch 17 has a plurality of switching modules 210, which are constructed similar to the switching modules shown in Figure 2. These switching modules 210 are connected in antiseries. In this antiserial circuit of the switching modules 210, the polarity / polarity of the switching modules changes, for example, adjacent switching modules have different polarities. In other words, the switching modules 210 of the power electronic switch 17 have opposite polarities / polarities. As a result, by means of this power electronic switch 17 DC currents flowing in both directions can be switched off. As with the power electronic switch of FIG. 4, each one is
  • Switching module 210 a Abieiter 213 connected in parallel.
  • DC currents flowing in both directions with the device 1 can be switched off.
  • the inverter 228 may be configured so that it can apply the voltage to the first winding 23 in any polarity (for example, by a bipolar design of the inverter 228).
  • FIG. 6 shows an exemplary embodiment of a switching module 210 'which, in the case of the device shown in FIG. 2, is a switching module 210 together with a parallel-connected switching module 210
  • the switching module 210 'of FIG. 6 is a so-called brake actuator module known as such, in which electrical energy can be converted into thermal energy by means of an ohmic resistance 610.
  • the mechanical switch 7 When the mechanical switch 7 is opened and is able to absorb voltage, the communicated DC current flows through terminals 616 and 617 in the
  • Switching element 620 When this switching element 620 is switched off Then, the direct current flows through a diode 622 into a capacitor 625 and charges this capacitor 625. If the capacitor voltage exceeds a predetermined value, then a switching element 630 in the right circuit branch is turned on, whereby the capacitor discharges via the resistor 610; the electrical energy is converted into heat in the resistor 610. By discharging the capacitor, the capacitor voltage drops. Falls below a predetermined lower voltage value of the capacitor voltage, the switching element 630 is turned off and the capacitor 625 recharges. This continues until the commutated DC power is off.
  • DC circuit breaker 1 can be used to advantage in high-voltage DC transmission networks (HVDC networks) to shut down operating currents or fault currents can. It may also be referred to as a high voltage DC circuit breaker 1. Due to the use of the mechanical switch 7 and the power electronic switch 17 low on-state losses are achieved in the on state; the power electronic switch 17 enables short response times and fast turn-off capability for DC currents. By means of the commutation device having a transformer, large potential differences between the Abschaltstromform and the supply unit can be realized. As a result, in particular the energy supply of the feed unit and / or the control of the feed unit is simplified.
  • HVDC networks high-voltage DC transmission networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Power Conversion In General (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

L'invention concerne un dispositif (1) de commutation d'un courant continu, comprenant un chemin conducteur de service (5) doté d'un premier commutateur mécanique (7), un chemin conducteur de coupure (15) monté en parallèle avec le chemin conducteur de service (5), doté d'un commutateur électronique de puissance (17), et un dispositif de commutation qui permet de commuter le courant continu du chemin conducteur de service (5) au chemin conducteur de coupure (15). Le dispositif de commutation comporte un transformateur (21).
EP14703039.9A 2014-01-21 2014-01-21 Dispositif de commutation d'un courant continu Active EP3072143B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14703039T PL3072143T3 (pl) 2014-01-21 2014-01-21 Urządzenie do przełączania prądu stałego

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/051100 WO2015110142A1 (fr) 2014-01-21 2014-01-21 Dispositif de commutation d'un courant continu

Publications (2)

Publication Number Publication Date
EP3072143A1 true EP3072143A1 (fr) 2016-09-28
EP3072143B1 EP3072143B1 (fr) 2017-09-27

Family

ID=50068971

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14703039.9A Active EP3072143B1 (fr) 2014-01-21 2014-01-21 Dispositif de commutation d'un courant continu

Country Status (8)

Country Link
US (1) US10354820B2 (fr)
EP (1) EP3072143B1 (fr)
KR (1) KR101832868B1 (fr)
CN (1) CN105917431B (fr)
ES (1) ES2654098T3 (fr)
PL (1) PL3072143T3 (fr)
RU (1) RU2654533C2 (fr)
WO (1) WO2015110142A1 (fr)

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KR20160100398A (ko) 2016-08-23
RU2016129625A (ru) 2018-02-28
KR101832868B1 (ko) 2018-02-28
CN105917431B (zh) 2019-06-28
US20170011875A1 (en) 2017-01-12
PL3072143T3 (pl) 2018-03-30
US10354820B2 (en) 2019-07-16
ES2654098T3 (es) 2018-02-12
CN105917431A (zh) 2016-08-31
EP3072143B1 (fr) 2017-09-27
WO2015110142A1 (fr) 2015-07-30
RU2654533C2 (ru) 2018-05-21
RU2016129625A3 (fr) 2018-02-28

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