WO2000012344A1 - Dispositif generateur - Google Patents

Dispositif generateur Download PDF

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Publication number
WO2000012344A1
WO2000012344A1 PCT/SE1999/001434 SE9901434W WO0012344A1 WO 2000012344 A1 WO2000012344 A1 WO 2000012344A1 SE 9901434 W SE9901434 W SE 9901434W WO 0012344 A1 WO0012344 A1 WO 0012344A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
generator
phase
high voltage
cycloconverter
Prior art date
Application number
PCT/SE1999/001434
Other languages
English (en)
Inventor
Lennart ENGSTRÖM
Mons HÖLLELAND
Claes Ivarson
Göran Lövgren
Fredrik Owman
Bengt Rothman
Lars Walfridsson
Original Assignee
Abb Ab
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 Abb Ab filed Critical Abb Ab
Priority to AU58901/99A priority Critical patent/AU5890199A/en
Publication of WO2000012344A1 publication Critical patent/WO2000012344A1/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
    • 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
    • H02M5/02—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 without intermediate conversion into dc
    • H02M5/04—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 without intermediate conversion into dc by static converters
    • H02M5/22—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/25—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/27—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means for conversion of frequency
    • H02M5/272—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means for conversion of frequency for variable speed constant frequency systems
    • 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
    • H02M5/02—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 without intermediate conversion into dc
    • H02M5/04—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 without intermediate conversion into dc by static converters
    • H02M5/22—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/25—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/27—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means for conversion of frequency
    • H02M5/271—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means for conversion of frequency from a three phase input voltage

Definitions

  • the present invention relates to a device for generating a one- phase alternating high voltage for a one-phase alternating high voltage network.
  • Such devices may find all types of applications, but for illumi- nating but not in any way restricting the invention and the problems associated therewith the generation of a one-phase alternating voltage for railway vehicles will hereinafter be discussed.
  • Such a one-phase alternating voltage has until now mainly been generated according to one of the following two models.
  • the first consists in utilizing an electrical one-phase machine in generator operation, in which it may be driven by a motor or a water turbine, but it is associated with some serious drawbacks.
  • high currents are necessarily induced in the damping windings to be arranged in the rotor as a consequence of the asymmetry of the one-phase construction, which complicates the construction of the rotor but primarily causes considerable losses.
  • a great problem of such one-phase machines is constituted by the mechanical load dominated by a pulsating moment giving the machine considerable additional stresses.
  • Another drawback of a one-phase machine, which for the rest is also there in a three-phase machine, is that there are important practical difficulties to vary the frequency of a one- phase voltage with respect to the rotation speed of the rotor, which is a disadvantage in cases when it is difficult to avoid that the rotation speed of the rotor varies as a consequence of outer circumstances, such as the water level of a water power plant, and still a one-phase voltage having a determined frequency has to be delivered to said network.
  • the other model is to utilize a so-called static converter device, but this solution has important drawbacks with respect to the rotation machine case especially within the railway field.
  • One of these is the generation of harmonic power pulsations on the feeding network by the one-phase inverter conversion.
  • This static solution also involves a lower capacity to take care of load peaks, which means that a higher over-capacity has to be provided than in the case when rotating machines are used.
  • larger and more complicated stations are required for static converters.
  • Another disadvantage is the requirement of particular transformers for static converters, from which high costs result. There are further disadvantages as well.
  • the object of the present invention is to provide a device of the type defined in the introduction, which to a large extent finds a remedy to the disadvantages mentioned above of such devices already known.
  • This object is according to the invention obtained by providing such a device, which comprises a high voltage generator adapted to generate an alternating voltage having at least three phases and a cycloconverter connected to the output of the generator and adapted to convert the multiple-phase voltage into a one-phase high voltage for said network.
  • the cycloconverter constitutes a three-phase load being substantially symmetric, whereby the losses of the damping windings are considerably reduced and comparatively small mechanical moment pulsations are created. Accordingly, the efficiency of a device of this type will be higher than for a one- phase generator, in spite of the fact that a three-phase genera- tor as well as a cycloconverter are included.
  • a multiple-phase generator is arranged in combination with a cycloconverter, which also means a great freedom with respect to the frequency obtainable of the one-phase alternating voltage in relation to the frequency of the multiple-phase alternating voltage generated by the generator.
  • the frequency of the one-phase alternating voltage may be varied within a wide range for a given frequency of the multiple- phase alternating voltage delivered by the generator, which in its turn means that it may be ensured that a constant desired frequency is obtained for the one-phase alternating voltage for said network independently of considerable variations in the number of revolutions of the rotor of the generator and thereby of the frequency of the alternating voltage generated by the generator.
  • the multiple-phase generator may be designed for a much higher frequency than the output frequency desired on the one-phase voltage network, which means that the rotating machine formed by the generator will be physically smaller for a given output power.
  • Another advantage of a device of this type is that it may produce more reactive power than a static converter. Accordingly, the solution according to the invention combines advantages from rotating machines and static converters to a solution being better in total.
  • said one- phase alternating high voltage network comprises a contact line for feeding a one-phase alternating voltage to railway vehicles.
  • the device is particularly well suited for this application, since the advantages of using a rotating machine for generating power for this application are great, and the invention enables utilizing them while avoiding disadvantages adhered to the devices already known having rotating machines.
  • the cycloconverter is adapted to convert the multiple-phase voltage into a one-phase voltage for transmission to a feeding line ex- tending in parallel with the contact line and having a voltage of a higher level than the voltage on the contact line for transmitting electric power from the feeding line to the contact line at selected points therealong.
  • Such feeding lines are used for reducing the power losses when delivering power to points along the contact line far away from the place of power generation.
  • the present invention is especially interesting for the case where said high voltage generator has a cable winding and is adapted to generate a voltage of substantially the same magni- tude as the voltage of said network, and the cycloconverter is designed to be connected to the network for delivering a one- phase alternating voltage thereto without any intermediate transformer.
  • the utilizing of such a cable wound high voltage generator which is described for example in the PCT-publica- tion 97/45921 of the applicant, makes it accordingly possible to generate a high voltage of sufficient magnitude directly by the generator, so that the cycloconverter may be connected directly to the network in question, even if this is a feeding line described, which well may have a voltage level exceeding 100 kV, in Sweden usually about 130 kV. Considerable costs for a transformer are saved thereby and the efficiency of the device is further increased.
  • the device comprises an electric motor arranged to drive the high voltage generator.
  • the output frequency of the cycloconverter is in practice independent of the rotation frequency of the motor, which in its turn means that the phase position on the output may be set independently of the phase position in the network driving the motor.
  • the high voltage generator is adapted to be a part of or be connected to a power plant.
  • the device comprises means adapted to regulate the phase position of the voltage generator by the cycloconverter.
  • the generator is adapted to deliver a voltage having a frequency being at least three times higher than the frequency of the one-phase voltage to be delivered by the cycloconverter on the output thereof.
  • the rotating machine gets physically smaller for a given power by the higher frequency of the generator than the desired output frequency.
  • Fig 1 shows very schematically a possible use of a device according to a preferred embodiment of the invention.
  • Fig 2 shows also very schematically a device according to a preferred embodiment of the invention.
  • Fig 1 The principles of a plant in which a device according to the in- vention may be included is schematically illustrated in Fig 1 , in which a plant for feeding alternating voltage to railway vehicles is illustrated here.
  • This plant has a first line 1 in the form of a so called contact line for feeding railway vehicles with one-phase alternating voltage, which typically may have an effective volt- age of for example 16 kV and a frequency of 16 2/3 Hz.
  • the line 1 is suspended at a suitable distance above the rail.
  • the line 1 has a considerable impedance, usually about 0.3 ⁇ /km, which has an inductive and a resistive part.
  • This plant has also a so called feeding line 2, which runs in parallel with the contact line and transfers a considerably higher one-phase alternating voltage, which means that the problems associated with the contact line 1 with respect to a restricted transferable power as a consequence of the phase shift between the current and the voltage, the voltage drop over the line and the losses in the line, are reduced to a large extent, in which the voltage of the feeding line for example may have a level of 130 kV.
  • This voltage is then transformed down through transformers 3 schematically indicated at different points along the contact line.
  • a device 4 according to the invention is arranged for generating a one-phase alternating voltage of the feeding line 2 and thereby also of the contact line 1 .
  • This device has a high voltage generator 5 adapted to generate a three-phase alternating voltage, and the high voltage generator is in the present case of the type having windings achieved by a cable, which means that such a high voltage may be generated thereby that no transformer is needed between the generator and the feeding line 2.
  • the winding of the generator is carried out by means of cables comprising an inner conductor of electricity surrounded by an insulating sheet on polymer base, such as for example cross-linked extruded polyetene cables (PEX-cables).
  • the cable is preferably constructed in the way described in the PCT-publi- cation 97/45921 of the applicant or in the Swedish patent application 9704439-0 of the applicant. More exactly, the cable comprises a flexible conductor of electricity having an envelope able to confine the electric field produced around the conductor.
  • the envelope of the cable comprises an insulation system, which in its turn comprises an insulation formed by a solid insulation material and outside the insulation an outer layer, which has an electric conductivity being higher than the one of the insulation so that the outer layer by connection to ground or an otherwise comparatively low potential shall be able to on one hand function potential-equalizing, and on the other to substantially confine the electrical field produced by said conductor of electricity inside the outer layer.
  • the insulation system may also comprise an insulation formed by a solid insulation material and an inner layer inside the insulation, in which said at least one conductor of electricity is arranged inside the inner layer and the inner layer has an electric conductivity being lower than for the conductor of electricity but sufficiently high for enabling the inner layer to function potential-equalizing and thereby equalizing with respect to the electric filed outside the inner layer.
  • the inner and/or outer layer comprises a semiconducting material.
  • a cycloconverter 9 for converting three-phase voltage into one- phase voltage is connected to the output of the generator 5, and this is of a conventional type illustrated in Fig 2. Accordingly, it has a number of so called current valves 6 adapted to be controlled for "mixing" an output one-phase alternating voltage with a fundamental component having a frequency being at the most 1/3 of the frequency of the alternating voltage generated by the generator.
  • Such a cycloconverter makes it possible to vary the frequency of the one-phase alternating voltage formed in this way continuously from zero to a frequency corresponding to about 1/3 of the output frequency of the multiple-phase genera- tor, which is illustrated by the means 8.
  • a big freedom with respect to the choice of the number of revolutions of the high voltage generator 5 is hereby obtained, which enables for example a generator according to the invention driven by water power to better utilize the water power even if the water level varies over a wide range, and a certain frequency, such as 16 2/3 Hz, may nevertheless all the time be delivered on the output of the cycloconverter. Furthermore, the generator will possibly be driven with a higher frequency than the output frequency desired from the device, which means that the rotating machine gets physi- cally smaller for a given power.
  • Fig 2 It is illustrated in Fig 2 how the generator 5 may be connected directly to a motor 7, through which it will be possible to vary the output frequency from the cycloconverter.
  • a means 10 is con- nected to the cycloconverter 9 for varying the output frequency in that way.
  • a use of a cycloconverter in this application enables also a bi-directional power flow, so that the total power flow gets bi-directional, with respect to active as well as reactive power. By phase position variations it will also be possible to select the power flow direction between different points of feeding in along a network fed by the device according to the invention.
  • the invention is of course not in any way restricted to the preferred embodiments described above, but many possibilities to modifications thereof should be apparent for a man with ordinary skill in the art, without departing from the basic idea of the invention as defined in the claims.
  • the number of phases of the voltage generated by the generator is more than three.
  • the invention also relates to conversion of a one-phase alternating high voltage into an alternating voltage having at least three phases, i.e. it is also considered to comprise the case in which a device defined in the claims is driven in the opposite direction, so that a one-phase alternating high voltage is converted into an alternating voltage having at least three phases.
  • network is to be given a broad sense and comprises except for networks in the normal sense thereof all types of lines adapted to carry the one-phase alternating voltage.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ac-Ac Conversion (AREA)

Abstract

L'invention concerne un dispositif destiné à générer une haute tension alternative monophasée pour un réseau haute tension alternative monophasée (2), ce dispositif comprenant un générateur haute tension (5) conçu pour générer une tension alternative avec au moins trois phases, et un cycloconvertisseur (9) connecté à la sortie dudit générateur de manière à convertir la tension polyphasée en une haute tension alternative monophasée pour ledit réseau.
PCT/SE1999/001434 1998-08-28 1999-08-24 Dispositif generateur WO2000012344A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU58901/99A AU5890199A (en) 1998-08-28 1999-08-24 A generator device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9802910-1 1998-08-28
SE9802910A SE9802910L (sv) 1998-08-28 1998-08-28 Generatoranordning

Publications (1)

Publication Number Publication Date
WO2000012344A1 true WO2000012344A1 (fr) 2000-03-09

Family

ID=20412409

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1999/001434 WO2000012344A1 (fr) 1998-08-28 1999-08-24 Dispositif generateur

Country Status (3)

Country Link
AU (1) AU5890199A (fr)
SE (1) SE9802910L (fr)
WO (1) WO2000012344A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01160745A (ja) * 1987-12-18 1989-06-23 Fuji Electric Co Ltd 直流電車き電方式
WO1991011841A1 (fr) * 1990-02-05 1991-08-08 Asea Brown Boveri Ab Cycloconvertisseur
WO1997045288A2 (fr) * 1996-05-29 1997-12-04 Asea Brown Boveri Ab Systeme d'entrainement electrique pour vehicules

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01160745A (ja) * 1987-12-18 1989-06-23 Fuji Electric Co Ltd 直流電車き電方式
WO1991011841A1 (fr) * 1990-02-05 1991-08-08 Asea Brown Boveri Ab Cycloconvertisseur
WO1997045288A2 (fr) * 1996-05-29 1997-12-04 Asea Brown Boveri Ab Systeme d'entrainement electrique pour vehicules
WO1997045919A2 (fr) * 1996-05-29 1997-12-04 Asea Brown Boveri Ab Machines electriques tournantes a circuit magnetique pour haute tension et leur procede de fabrication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN *

Also Published As

Publication number Publication date
SE9802910D0 (sv) 1998-08-28
AU5890199A (en) 2000-03-21
SE9802910L (sv) 2000-02-29

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