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EP1604550A1 - Dispositif d'alimentation en courant destine a alimenter une charge monophasee, en particulier un four a induction monophase, a partir du reseau de courant triphase - Google Patents

Dispositif d'alimentation en courant destine a alimenter une charge monophasee, en particulier un four a induction monophase, a partir du reseau de courant triphase

Info

Publication number
EP1604550A1
EP1604550A1 EP04718905A EP04718905A EP1604550A1 EP 1604550 A1 EP1604550 A1 EP 1604550A1 EP 04718905 A EP04718905 A EP 04718905A EP 04718905 A EP04718905 A EP 04718905A EP 1604550 A1 EP1604550 A1 EP 1604550A1
Authority
EP
European Patent Office
Prior art keywords
converter
load
phase
power supply
balancing
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
EP04718905A
Other languages
German (de)
English (en)
Other versions
EP1604550B1 (fr
Inventor
Rik W. De Doncker
Dirk Linzen
Uwe Jansen
Klemens Peters
Thomas Frey
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.)
Otto Junker GmbH
Original Assignee
Otto Junker GmbH
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 Otto Junker GmbH filed Critical Otto Junker GmbH
Publication of EP1604550A1 publication Critical patent/EP1604550A1/fr
Application granted granted Critical
Publication of EP1604550B1 publication Critical patent/EP1604550B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/08—Control, e.g. of temperature, of power using compensating or balancing arrangements

Definitions

  • Power supply device for feeding a single-phase load, in particular a single-phase induction furnace, from the three-phase network
  • the invention relates to a power supply device for feeding a single-phase load, in particular a single-phase induction furnace, from the three-phase network.
  • the induction furnace supplied by such a power supply device can be a crucible furnace or channel furnace for melting, keeping warm and overheating of metals or an induction furnace for heating metallic workpieces for heat treatment, for thermoforming or for other purposes.
  • a connection to the three-phase network must be made in any case.
  • Induction furnaces are usually highly inductive, single-phase loads.
  • the choice of the frequency of the supply current is determined by the design of the furnace, the furnace size and the requirements of the process.
  • the induction furnace is compensated and connected to the three-phase network via a balancing device, for example in a stonemason circuit.
  • a balancing device for example in a stonemason circuit.
  • Both the compensation and the balancing of such a power supply system must be switchable, since the impedance of the furnace changes with the degree of filling, the type of material used, the temperature and wear of the infeed and the compensation and balancing must be adjusted.
  • additional switching devices must be provided to control the power. Details on circuit variants of balancing devices as well as theoretical bases for their calculation can be found, for example, in the following document: Reichert, K .: The balancing and switching of mains frequency induction furnace systems in Elektrotown 21 (1963), pp. 309-319. There, for example, the possibility of symmetrizing a single-phase load is presented, so that the associated converter can be operated on a 3-phase network.
  • the above-mentioned article also describes a direct converter in which the parallel-compensated load resonant circuit guides the direct converter consisting of 3 antiparallel thyristor pairs.
  • DC link converters such as those currently used in systems for supplying induction furnaces, generate harmonic currents in the network through the rectifier, which can impair the operation of other consumers. At least for large outputs, the use of 12 or 24 pulp rectifiers is the only measure that allows a cost-effective reduction of harmonic currents. If DC link converters are designed with self-commutated input rectifiers to achieve a sinusoidal input current, this increases the costs considerably and can lead to a significant loss in efficiency. Another disadvantage of the DC link converters is the high outlay for the components of the DC link, especially at low output frequencies.
  • the load-controlled direct inverters investigated in the past could not prevail because the effects of the output current have to be kept away from the mains by a complex input filter.
  • the input filter is particularly complex when relatively low output frequencies are required. However, this is precisely the case for large induction crucible furnaces, since such furnaces operate at frequencies between 80 Hz and 500 Hz.
  • circuit techniques for the use of switchable power semiconductors in intermediate circuit-free circuits such as self-commutated direct converters (also referred to as matrix converters) for supplying a single-phase load.
  • circuits of self-commutated direct converters are e.g. described in DE 19832225 A1.
  • the task is now to reduce the high expenditure of reactances, ie inductors and / or capacities, which is operated in the previously known solutions, and to create the prerequisites for the use of intermediate circuit circuits.
  • Power supply devices are to be specified in which the energy can be stored with less effort on passive components. First of all, it is important to recognize the cause of the high reactance effort. This is explained below:
  • the power supply device serves several purposes at the same time:
  • Output side must therefore be supplied from the power supply device, i. H. in the power supply device must double energy storage
  • a converter which, in addition to the two output potentials for connecting a parallel compensated load, has at least one further output potential and that one or. Between the further output potential and one of the output potentials for connecting the load or between the further output potentials several symmetry reactants for energy storage with double output frequency are connected, and that the control of the converter and / or the symmetry reactances can be adapted to the impedance of the load (O) at different operating points.
  • at least one balancing capacitor and / or one balancing choke are provided as balancing reactances.
  • the effort for the reactances is thus reduced, since the energy storage takes place with the full amplitude of the output voltage of the converter used in the balancing reactances and not, as is customary in the case of intermediate circuit converters, by means of a small alternating component of the current in comparison to the direct component (in the case of the intermediate circuit converter ) or the voltage (for the DC link converter) in the reactances of the DC link converter. If an intermediate circuit converter is used as the converter, the reactances in it can thus be dimensioned smaller. Since the energy storage required for the balancing takes place in the balancing reactances, direct converters can also be used which do not contain any reactances and enable exact control of the output power.
  • the converter used can be a converter with a voltage intermediate circuit, a converter with a current intermediate circuit or a direct converter.
  • the components in the inverter of the intermediate circuit converter must be able to be switched off.
  • the same applies to the direct converter. Inductors or capacitors or any combination of these elements can be used as reactances for energy storage.
  • the invention can also be designed such that an intermediate circuit converter is provided as the converter.
  • the energy storage required for the symmetry is shifted from the reactances of the intermediate circuit to the symmetry reactances, so that the reactances of the intermediate circuit can be dimensioned smaller.
  • the symmetry reactances require a certain amount of effort, but overall the total effort is cheaper compared to the known arrangements.
  • the device can advantageously also be designed such that a self-commutated direct converter is provided as the converter.
  • a self-commutated direct converter is provided as the converter.
  • the use of a Such self-commutated direct converters require that the load absorbs a load that is constant over a network period. This is achieved through the symmetry reactances.
  • the device can also advantageously be designed such that at least one balancing choke and / or a balancing capacitor is / are provided as the balancing reactances, so that the single-phase load, i.e. the induction furnace, with respect to the three connection terminals of the network and with regard to the amplitude and phase position of Voltages and currents is symmetrical. Since the amplitude and phase position can be set as desired by using a converter, one of the two balancing reactances can be dispensed with.
  • a control method for controlling the supply of a single-phase load, in particular an induction furnace, from the three-phase network with a device according to the invention is proposed, which is characterized in that when the resistance and / or the induction of the load is changed to adjust the power, the amplitude and / or the phase position and / or the frequency of the output voltages can be varied, so that the power supply device can thus only be adapted to a load that has become asymmetrical by control. So far, disconnectable partial capacitances or partial inductors have been used to adapt to the changed impedance of the load.
  • the converter supplies a 1-phase load, the frequency of which is usually higher than that of the 3-phase network and e.g. Is 250Hz;
  • the converter feeds a passive load, the frequency of which is variable depending on the furnace filling and temperature, the converter having to adjust its output frequencies to the resonance frequency of the furnace and the compensation capacitor; that the converter has only three output potentials between which the load and the balancing are connected; a converter is used, to whose output terminals a load with symmetry is connected in a stonemason circuit, whereby the task of distributing the load over the 3 phases of the supplying network is already taken over by the converter, i.e. the stonemesh circuit only to compensate for periodic power fluctuations due to the single-phase Load serves.
  • Fig. 2 power supply device with stonemason circuit on the output side of the converter
  • Fig. 3 power supply device with inductance as an energy store on the output side of the converter
  • Fig. 4 power supply device with a capacitor as an energy store on the output side of the converter
  • Fig. 6 power supply device with self-controlled direct converter with capacitor as an energy store on the output side.
  • Fig. 1 shows possible training variants for bidirectional main switches, which are required for the construction of self-commutated direct converters.
  • a bidirectional main switch can be constructed as a combination of unidirectionally blocking IGBTs and diodes (a, b, c) or exclusively from symmetrically blocking IGBTs (d).
  • IGBTs unidirectionally blocking IGBTs and diodes
  • d symmetrically blocking IGBTs
  • FIGS. 2-4 show different forms of embodiment of the power supply device according to the invention with the connection of the energy stores, in which the energy required for the balancing is stored.
  • the parallel compensated load consisting of the furnace 0 and the compensation capacitor CK
  • the parallel compensated load is connected to the three-phase output of the converter S by means of a Steinmetz circuit, consisting of a balancing capacitor Cs and a balancing choke L s .
  • the components of the stonemason circuit are dimensioned in such a way that the converter S is subjected to a symmetrical load at nominal load.
  • the converter S is controlled in such a way that a three-phase voltage system is set at its output.
  • FIG. 5 shows an arrangement corresponding to FIG. 4, in which the converter S is designed as a voltage intermediate circuit converter.
  • the DC link converter consists of the line rectifier, implemented with diodes D.-D 6 , the DC link choke Ld, the DC link capacitor C d and the inverter, which consists of the IGBTs T.-T 6 , the drivers Tn-Tr ⁇ and the decoupling wire L E.
  • the decoupling choke LE enables the capacitors for compensation CK and balancing Cs to be connected to the output of the voltage intermediate circuit converter, without this leading to undesired compensating currents.
  • Appropriate control of the driver Tr.-Tr ⁇ ensures that the intermediate circuit is only loaded with currents in the range of the switching frequency. Current components in the intermediate circuit capacitor C d with double output frequency can be avoided by setting the output variables in such a way that the energy required to compensate for the power balance is only stored in the balancing capacitor Cs connected on the output side.
  • FIG. 6 shows an embodiment in which the converter is designed as a self-guided direct converter or matrix converter.
  • filter capacitors CF are arranged in a delta connection to suppress switching-frequency repercussions. Together with the inductance LT of the upstream transformer or an input choke, these form a low-pass filter.
  • a decoupling choke LE is again arranged on the output side.
  • the intermediate circuit can be omitted (direct converter) or reduced. As a result, the power supply device can be made more compact and less expensive.
  • the energy stored in the converter is lower, so that in the event of a fault, for example Defect of a semiconductor requires less energy to be broken down. This reduces the load on all components.
  • treated water of low conductivity must be used to prevent electrolysis.
  • the power converters can thus be built water-cooled using power semiconductors in the form of disk cells, without the need for insulation between the electrical connection and the heat sink, or for the converter cooling water being particularly low

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Ac-Ac Conversion (AREA)
  • Inverter Devices (AREA)

Abstract

Dispositif d'alimentation en courant destiné à alimenter une charge monophasée, en particulier un four à induction monophasé (0), à partir du réseau de courant triphasé. Ledit dispositif est caractérisé en ce qu'il comprend un convertisseur (S) possédant, outre les deux potentiels de sortie pour la connexion d'une charge (0) à compensation parallèle, au moins un autre potentiel de sortie, en ce qu'une ou plusieurs réactances d'équilibrage destinées au stockage d'énergie et à double fréquence de sortie sont connectées entre l'autre potentiel de sortie et l'un des potentiels de sortie pour la connexion de la charge (0) ou entre les autres potentiels de sortie, et en ce que la commande du convertisseur et / ou les réactances d'équilibrage peuvent être adaptées à l'impédance de la charge (0) en différents points de fonctionnement. La présente invention concerne également un procédé de commande de l'alimentation d'une charge monophasée, en particulier d'un four à induction monophasé, à partir du réseau de courant triphasé à l'aide d'un dispositif selon les revendications susmentionnées. Ledit procédé est caractérisé en ce qu'en cas de modification de la résistance et / ou de l'inductance de la charge pour le réglage de la puissance, l'amplitude et / ou la position de phase et / ou la fréquence des tensions de sortie peuvent être modifiées. Il est ainsi possible de réduire les coûts élevés liés à des réactances, c'est-à-dire à des inductances et / ou à des condensateurs.
EP04718905A 2003-03-18 2004-03-10 Dispositif d'alimentation en courant destine a alimenter une charge monophasee, en particulier un four a induction monophase, a partir du reseau de courant triphase Expired - Lifetime EP1604550B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2003112020 DE10312020A1 (de) 2003-03-18 2003-03-18 Stromversorgungsvorrichtung zur Speisung einer einphasigen Last, insbesondere eines einphasigen Induktionsofens aus dem Drehstromnetz
DE10312020 2003-03-18
PCT/DE2004/000475 WO2004084587A1 (fr) 2003-03-18 2004-03-10 Dispositif d'alimentation en courant destine a alimenter une charge monophasee, en particulier un four a induction monophase, a partir du reseau de courant triphase

Publications (2)

Publication Number Publication Date
EP1604550A1 true EP1604550A1 (fr) 2005-12-14
EP1604550B1 EP1604550B1 (fr) 2006-08-09

Family

ID=32945967

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04718905A Expired - Lifetime EP1604550B1 (fr) 2003-03-18 2004-03-10 Dispositif d'alimentation en courant destine a alimenter une charge monophasee, en particulier un four a induction monophase, a partir du reseau de courant triphase

Country Status (4)

Country Link
EP (1) EP1604550B1 (fr)
DE (2) DE10312020A1 (fr)
ES (1) ES2270359T3 (fr)
WO (1) WO2004084587A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007078218A1 (fr) 2005-12-30 2007-07-12 Abb Technology Ltd Dispositif d’equilibrage

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005042324A1 (de) * 2005-09-06 2007-03-15 Siemens Ag Weitspannungs-Umrichter
DE102005042322A1 (de) * 2005-09-06 2007-03-15 Siemens Ag Weitspannungs-Umrichter
CN104836453A (zh) * 2015-05-14 2015-08-12 杭州科远电炉有限公司 一种新型晶闸管串联半桥逆变谐振变频装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2939514A1 (de) * 1979-09-28 1981-04-16 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zur uebertragung elektrischer energie hoher leistung aus einem dreiphasigen versorgungsnetz hoeherer frequenz in ein einphasiges lastnetz niedrigerer frequenz
DE3213778A1 (de) * 1982-04-08 1983-10-13 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Netzkupplung zum austausch elektrischer energie zwischen einem dreiphasennetz hoeherer frequenz und einem einphasennetz niedrigerer frequenz
FR2527020A1 (fr) * 1982-05-17 1983-11-18 Inst Elektrodinamiki Akademii Installation magnetodynamique
FR2726704B1 (fr) * 1994-11-07 1997-01-31 Breda Jean Pierre Generateur haute frequence a resonance pour un appareil de chauffage a induction
GB2350733B (en) * 1999-06-03 2003-02-12 Cheltenham Induction Heating L Power supply
DE19926198A1 (de) * 1999-06-09 2000-12-14 Junker Gmbh O Schaltung und Steuerverfahren für Wechselrichter zur Speisung von Induktionsöfen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004084587A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007078218A1 (fr) 2005-12-30 2007-07-12 Abb Technology Ltd Dispositif d’equilibrage
EP1966868A1 (fr) * 2005-12-30 2008-09-10 ABB Technology Ltd Dispositif d' equilibrage
EP1966868A4 (fr) * 2005-12-30 2010-09-29 Abb Technology Ltd Dispositif d' equilibrage

Also Published As

Publication number Publication date
DE10312020A1 (de) 2004-10-07
ES2270359T3 (es) 2007-04-01
DE502004001163D1 (de) 2006-09-21
WO2004084587A1 (fr) 2004-09-30
EP1604550B1 (fr) 2006-08-09

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