EP1642383A2 - Convertisseur de frequences destine a des generateurs grande vitesse - Google Patents

Convertisseur de frequences destine a des generateurs grande vitesse

Info

Publication number
EP1642383A2
EP1642383A2 EP04766126A EP04766126A EP1642383A2 EP 1642383 A2 EP1642383 A2 EP 1642383A2 EP 04766126 A EP04766126 A EP 04766126A EP 04766126 A EP04766126 A EP 04766126A EP 1642383 A2 EP1642383 A2 EP 1642383A2
Authority
EP
European Patent Office
Prior art keywords
generator
voltage
frequency converter
network
frequency
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Withdrawn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
EP04766126A
Other languages
German (de)
English (en)
Inventor
Alfred Rufer
Martin Veenstra
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.)
General Electric Technology GmbH
Original Assignee
Alstom Technology 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 Alstom Technology AG filed Critical Alstom Technology AG
Publication of EP1642383A2 publication Critical patent/EP1642383A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • 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
    • 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
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
    • H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
    • H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters
    • 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
    • H02P2101/00—Special adaptation of control arrangements for generators
    • H02P2101/10—Special adaptation of control arrangements for generators for water-driven turbines

Definitions

  • the present invention relates to a method for adapting the alternating current generated by a generator or the alternating voltage generated by a generator to a network, the generator being a generator with at least one excitation coil.
  • the present invention relates to a device for performing such a method.
  • Variable-speed generators or generators in general with a frequency that deviates from the mains frequency are typically transmitted to the power supply network via converters, which adapt the voltage and the frequency generated by the generator to the voltage and frequency of the power supply network connected.
  • different devices are used as converters, for example so-called direct converters, in which, for. B. using semiconductor switches (for example thyristors or GTOs, gate turn-off thyristors) in a direct conversion (AC / AC) the two different voltages and frequencies can be set relative to each other.
  • Direct converters of this type exist, for example, as so-called cycloconverters or as so-called matrix converters (for example described in US Pat. No. 5,594,636). With natural commutation, they produce undesirable and difficult to eliminate low-frequency components, with forced commutation they have large switching losses.
  • a voltage and frequency-adapted connection a generator to a power supply network in the form of an indirect conversion.
  • a direct current is first generated from the alternating current generated by the generator in a rectifier, and this direct current is then brought to the voltage and frequency of the power supply network in an inverter.
  • Controlled inverters of this type also use semiconductor switches (for example GTOs, IGBTs, Insulated Gate Bipolar Transistors, MOSFETs, Metal Oxide Semiconductor Field Effect Transistors, or IGCTs, Integrated Gate Commutated Thyristors) and have large switching losses at the switching frequencies typically used.
  • the object of the invention is therefore to provide a simple, flexible method characterized by low switching losses for adapting the alternating current generated by a generator or the alternating voltage generated by a generator to a network. It is a method in connection with a generator with at least one excitation coil.
  • a static frequency converter is used to adapt between the generator and the network, and in that on the one hand, means for controlling the power fed into the network are arranged with which the strength of the excitation field generated by the at least one excitation coil is regulated , and on the other hand a suitable control of the phase position between the frequency converter voltage and the generator or mains voltage is carried out.
  • the essence of the invention is therefore to utilize the advantages that are typically associated with the use of static frequency converters, namely simple construction, low switching losses, etc., without having to accept the disadvantages thereof.
  • a major disadvantage of static frequency converters is that they do convert the frequency allow between input and output, but not typically a simple control of the ratio of the amplitude of the AC voltage between input and output.
  • This disadvantage is now eliminated in a surprisingly simple manner in that, on the one hand, the excitation field of the excitation coil of the generator and on the other hand the phase position between the voltage generated by the controlled rectifier and the generator voltage are regulated accordingly to regulate the power coupled into the network by the generator becomes.
  • the proposed circuit or method has the further advantage that it can allow the turbine generator group to start up to the required minimum speed in a simple manner when starting.
  • Thermal or other energy sources such as gas turbines cannot generate torque at low speeds. They must first be brought to a minimum speed using an engine before they can output power.
  • the generator can only be operated synchronously with the network, i.e. at nominal speed, and an additional starter motor with its own supply and control devices is required (state of the art).
  • the additional starting devices can be dispensed with if the converter can start up the generator together with the turbine. To do this:
  • the converter can generate any voltage and frequency on the generator side.
  • voltage and frequency are roughly proportional to the speed (with constant excitation). For the run-up from standstill to nominal speed, voltage and frequency must also be varied from zero to nominal value.
  • the proposed circuit is very suitable for a startup. It can easily generate any voltages and frequencies by operating at higher switching frequencies. The higher losses generated by this mode of operation only occur when starting up, which is allowed because only for a short time, and since similar losses typically occur in a special starting device. As soon as the speed range of energy production is reached, the system switches to low-loss basic frequency clocking.
  • the static frequency converter used is an indirect frequency converter.
  • it is a static frequency converter designed as a rectifier / inverter with a direct current stage connected in between.
  • This simple design which is usually associated with high switching losses if the ratio of the voltages between input and output is to be variably set via a specific circuit of rectifier or inverter, can be achieved by regulating the field of excitation according to the invention and the phase length of the Frequency converter generated voltages can be set without complex measures.
  • a further preferred embodiment of the method according to the invention is characterized in that the adaptation takes place via a static frequency converter with a controlled rectifier in basic frequency clocking and / or with a controlled inverter in basic frequency clocking.
  • the method is particularly advantageous if both rectifiers and inverters are designed as controlled components with fundamental frequency clocking.
  • the use of two pulse inverters arranged to a certain extent in mirror image is particularly simple and is also possible with generators which have to be dynamically regulated in their power coupling to the network due to the control of the excitation coil according to the invention.
  • Two-stage converters or three-stage converters can be used for the rectifier as well as for the inverter.
  • Three-stage converters are preferred for a generator with only one stator winding group, and two and three-stage converters are very suitable for several winding groups.
  • the controlled inverter is preferably a three-stage inverter. Both are preferably operated in basic frequency clocking.
  • Such three-stage inverters are known to the person skilled in the art in their general mode of operation and are available, for example, in standard literature such as "Convertisseurs statiques", Hansruedi Buehler, Presses Polytechniques et Universitaires Romandes, 1991.
  • Such a method according to the invention is preferably implemented by arranging a central control which, by measuring the voltage and / or current in front of and / or behind the static frequency converter, adjusts the amplitude of the AC voltage fed into the network by appropriately controlling the means for the control the strength of the excitation field generated by the excitation coil.
  • the central control also sets a suitable phase angle between
  • the active power is mainly determined by the angle, the reactive power (and thus the power factor) by the amplitude.
  • the frequency components that may occur outside the actual desired fundamental frequency both on the generator side of the static frequency converter and on the network side of the static frequency converter can be reduced or even completely eliminated by arranging corresponding filter elements on one or both sides.
  • bandpass filters, high-pass filters or low-pass filters, or combinations of such filters can be considered. It can also be active or passive Trade components.
  • the method according to the invention can be carried out not only in the case of generators with one stator winding group, but equally in the case of generators with two or more winding groups. Accordingly, the groups of three phases generated in each case are converted via individual static frequency converters.
  • the coupling to the network behind the static frequency converter is preferably ensured by means of a transformer in which the one group of three phases are guided in a star connection and the other group of three phases in a delta connection.
  • the present invention relates to an apparatus for carrying out a method as described above.
  • the device preferably comprises a generator with at least one excitation coil which can be regulated by means of adapting the amplitude of the AC voltage to the requirements of the network, a static frequency converter comprising at least one controlled rectifier in basic frequency clocking and at least one controlled inverter in basic frequency clocking and at least one controller for Control of these elements.
  • Figure 1 is a schematic representation of the connection of a generator to a power supply network.
  • Fig. 3 is a schematic representation acc. Fig. 1, with additional filters for damping harmonics are inserted.
  • gears can be used between the actual power source P and the generator for generating electrical energy.
  • these usually have the disadvantage that they entail high losses and are maintenance-intensive.
  • As the frequency of rotation of the generator ultimately determines the frequency of the alternating current generated with it it is alternatively also possible to connect the generator directly to the power source, possibly via a coupling, and then to adapt the frequency of the generated current to the mains frequency behind the generator by using a frequency converter.
  • a frequency converter avoids the mechanical losses occurring in a transmission, but usually leads to energy losses due to the switching or commutation behavior of the switched semiconductor components used therein.
  • the system comprises a generator 1, in which a rotating excitation coil 2 induces a corresponding AC voltage in the stator windings 16.
  • the rotation of the excitation coil 2 is ensured by a power source P, which can consist of a gas turbine, or else of a water turbine or another kinetic energy source.
  • the current sent through the excitation coil 2 can be set as a function of the requirements by means 3 for regulation, which are controlled by a controller 6.
  • means 3 for regulation which are controlled by a controller 6.
  • thyristor current can be used as a means 3 for regulation if a three-phase network is used as the energy source, or choppers if a direct current is used as the energy source. The manner and target of this control of the means 3 is described below.
  • the current generated by the generator 1 is then fed to a frequency converter 9.
  • the frequency converter is a so-called static frequency converter.
  • possibilities are advantageously provided in front of the frequency converter to measure the current intensity and voltage of the alternating current and to supply the corresponding measured values to the controller 6.
  • the frequency converter 9 comprises three parts, ie a rectifier 4, an inverter 5 and a direct current stage 10.
  • the rectifier 4 ensures the conversion of the alternating current of the generator 1 with a frequency fGen into direct current.
  • This direct current is then in an inverter 5 f to the adjusted frequency to the network N etwork changed.
  • the ratio between AC voltage and DC voltage is constant in a two-stage converter with basic frequency switching.
  • the ratio between AC voltage and DC voltage can be set as desired.
  • harmonics are generated (as with the two-stage converter).
  • One of the advantages of the three-stage converter compared to the two-stage converter is the possibility of reduce waves and get a comparatively good waveform. This goal limits the adjustability of the voltage ratio to a small range, the size of which depends on the size of the permitted harmonics.
  • the voltage control is now carried out in combination via the converter and the generator excitation.
  • the active power is mainly influenced by the phase angle between the generator voltage and the voltage generated by the controlled rectifier (or mains voltage and the voltage generated by the controlled inverter).
  • the reactive power (and thus the power factor) is mainly influenced by the ratio of the amplitudes of the generator voltage and the voltage generated by the controlled rectifier (or mains voltage and the voltage generated by the controlled inverter).
  • a three-stage pulse rectifier is used as the rectifier 4.
  • Such a pulse rectifier is described, for example, in "Convertisseurs statiques”, Hansruedi Bühler, Presses Polytechniques et Universitaires Romandes, 1991 on page 302ff and is therefore known to the person skilled in the art.
  • Each of the three phases made available by generator 1 is rectified via a corresponding rectifier circuit, as shown in FIG. 1.
  • Semiconductor components such as GTOs, IGBTs, MOSFETs or IGCTs are used as power switches in such a pulse rectifier.
  • the rectifier 4 is operated with the so-called basic frequency clocking, ie with a method in which the switching losses or commutation losses that occur are minimal (cf. loc. Cit. P. 147ff.).
  • the only disadvantage of this switching method is that the voltage ratio of the input voltage from the generator (UGen) to the DC voltage (U DC) is constant and cannot be regulated without changing the switching method and without the associated switching losses.
  • the DC voltage provided in such a three-stage rectification, in which the individual of the three levels are separated from one another by capacitances, is then used as an input for an inverter 5 of the same type, but arranged to a certain extent in mirror image.
  • a pulse inverter as has already been described in connection with the rectifier 4, is again used as the inverter 5.
  • This pulse-controlled inverter is also operated in its basic frequency clocking so that switching losses are kept to a minimum.
  • the AC voltage made available by the inverter 5 in three phases is then fed into the network 8, possibly via a transformer 7.
  • U N. etz in other words, such a frequency converter 9 can be used to set any ratio of the frequencies from input (fcen) to output (f etz), but any regulation of the active and reactive power coupled into the network 8 is due to the rigid ratio of tensions not possible.
  • the procedure according to the invention is such that the ratio of the voltages is set indirectly via the setting of the current supplied to the excitation coil 2.
  • This Possible regulation via the means 3 leads to the excitation field generated by the excitation coil 2 and thus the voltage induced in the stator windings 16 being regulated.
  • the control is carried out by the unit 6, which therefor the data available via the measuring devices for voltage measurement 11 and for current measurement 17 for voltage and current respectively. can use for their phase positions and frequencies.
  • the desired power with the desired power factor can always be delivered to the network 8.
  • this type of control has the great advantage that changes in the power fed into the network 8 are possible on a very short time scale.
  • the comparatively good waveform of a three-stage rectifier or inverter makes it possible to use a frequency converter 9 constructed therefrom as a direct connection between generator 1 and network 8. If necessary, as already mentioned, a transformer 7 can additionally be used between frequency converter 9 and network 8.
  • the generator can also be a generator with several stator winding groups.
  • 2 shows a generator 1 with two stator winding groups 12 and 13. The corresponding three phases of each winding group are then fed separately to a frequency converter.
  • the three phases of the first stator winding groups 12 are fed to a first rectifier stage 41 and then brought to the frequency required for the network 8 in an inverter stage 51.
  • the three phases of the second stator winding groups 13 are fed to a first rectifier stage 42 and then also brought to the frequency required for the network in an inverter stage 52.
  • the three phases of the first group and the second group are then coupled to the network via transformer coils 72 and 73, respectively, by means of transformer coil 71.
  • one of the groups is advantageously designed in a star connection and the other group in a delta connection. If the design of either generator 1 or network 8 makes this necessary, it is also possible to eliminate or eliminate harmonic multiples, such as those which typically occur in the proposed rectifier 4 and the proposed inverter 5 in terms of their fundamental frequency clocking, using appropriate filters dampen. This is shown in FIG. 3, where a low pass is provided on the side of the generator 1 via a choke coil 14 in line and a capacitance 15 to earth. In this way, undesired frequency components, which can affect the generator 1 and, for example, lead to torque oscillations, can be eliminated.
  • undesired frequency components in the direction of the network 8 can be reduced or even eliminated via a corresponding low-pass filter arranged on the side of the network 8, composed of a choke coil 74 in line and a capacitance 75 to earth.
  • a corresponding low-pass filter arranged on the side of the network 8, composed of a choke coil 74 in line and a capacitance 75 to earth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Rectifiers (AREA)
  • Ac-Ac Conversion (AREA)

Abstract

La présente invention concerne un procédé et un dispositif permettant d'adapter le courant alternatif produit par un générateur (1) ou la tension alternative produire par un générateur (1) à un réseau (8), le générateur (1) présentant au moins une bobine d'excitation (2). Afin d'obtenir une adaptation flexible de la puissance cédée au réseau (8) en cas de faibles affaiblissements dus à la commutation, on utilise un convertisseur de fréquences statique (9) pour l'adaptation entre le générateur (1) et le réseau (8) et on place, d'une part, des moyens qui permettent de régler l'intensité du champ d'excitation produit par la ou les bobine(s) d'excitation (2) pour la commande de la puissance cédée au réseau (8) et, d'autre part, une commande adaptée de la position de phase entre la tension du convertisseur de fréquences et la tension du générateur ou la tension secteur.
EP04766126A 2003-07-05 2004-07-05 Convertisseur de frequences destine a des generateurs grande vitesse Withdrawn EP1642383A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10330473A DE10330473A1 (de) 2003-07-05 2003-07-05 Frequenzumwandler für Hochgeschwindigkeitsgeneratoren
PCT/EP2004/051353 WO2005004317A2 (fr) 2003-07-05 2004-07-05 Convertisseur de frequences destine a des generateurs grande vitesse

Publications (1)

Publication Number Publication Date
EP1642383A2 true EP1642383A2 (fr) 2006-04-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04766126A Withdrawn EP1642383A2 (fr) 2003-07-05 2004-07-05 Convertisseur de frequences destine a des generateurs grande vitesse

Country Status (5)

Country Link
US (1) US7180270B2 (fr)
EP (1) EP1642383A2 (fr)
JP (1) JP2009514490A (fr)
DE (1) DE10330473A1 (fr)
WO (1) WO2005004317A2 (fr)

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JP2009514490A (ja) 2009-04-02
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WO2005004317A3 (fr) 2005-03-03
US7180270B2 (en) 2007-02-20

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