EP0686266A1 - Dispositif permettant de detecter la valeur reelle d'une grandeur mesuree a haut potentiel - Google Patents

Dispositif permettant de detecter la valeur reelle d'une grandeur mesuree a haut potentiel

Info

Publication number
EP0686266A1
EP0686266A1 EP94907554A EP94907554A EP0686266A1 EP 0686266 A1 EP0686266 A1 EP 0686266A1 EP 94907554 A EP94907554 A EP 94907554A EP 94907554 A EP94907554 A EP 94907554A EP 0686266 A1 EP0686266 A1 EP 0686266A1
Authority
EP
European Patent Office
Prior art keywords
converter
control unit
actual value
auxiliary power
connections
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Withdrawn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
EP94907554A
Other languages
German (de)
English (en)
Inventor
Rainer Marquardt
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 EP94907554A priority Critical patent/EP0686266A1/fr
Publication of EP0686266A1 publication Critical patent/EP0686266A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L2019/0001—Codebooks
    • G10L2019/0013—Codebook search algorithms
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
    • G10L25/06—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being correlation coefficients

Definitions

  • the invention relates to a device for actual value detection of a measured variable at high potential and its use in a high-performance converter.
  • control and regulating device of the converter of this drive When regulating an AC drive, the control and regulating device of the converter of this drive requires both the actual values of the output currents or the output voltages and the actual values of the intermediate current or the intermediate circuit voltage of the converter. These direct and alternating variables at high potential must be transferred isolated from the converter to the associated control and regulating device.
  • Magnetic sensors are used for the isolated detection of measured variables of a converter.
  • a sensor consists of a coil with an air gap, in which a Hall element is arranged, and electronics. This coil is pushed over a power line or a busbar in which the current to be measured flows.
  • the invention is based on the object of specifying a device for recording the actual value of a measured variable at high potential which no longer has the disadvantages mentioned.
  • a measuring amplifier with an upstream measuring range adjustment is used instead of a magnetic sensor. This means that the measured variable is recorded and, if necessary, this measured variable is processed with this device at high potential. Due to the embodiment of the device according to the invention for recording the actual value of a measured variable, this device itself no longer has to effect potential isolation. The space requirement of this facility is thus considerably reduced.
  • the converter valves are each provided with a control unit, to which a control signal and auxiliary power are each electrically isolated and a feedback signal from these control units are each electrically isolated from a control unit, are not supplied shielded lines between the control unit of the converter and the device for actual value acquisition required. Due to the configuration of the device for recording the actual value according to the invention, this device now takes up very little space, so that it can be arranged in the immediate vicinity of the control unit of a converter valve whose actual current value is to be determined.
  • the required auxiliary energy which is much lower than the required auxiliary energy of the known magnetic transducer, can be extracted from the auxiliary energy of the control unit of a converter valve.
  • the auxiliary energy for the device according to the invention for detecting the actual value no longer needs to be transmitted by the control device, as a result of which the problem of the high insulation expenditure for the safety-relevant potential separation point between the control device and the converter is eliminated.
  • the use of the existing transmission channel for the feedback signal from the control unit to the control unit is appropriate.
  • the analog measured value for this corresponding transmission channel can be processed using simple and known means, as a result of which the spatial extent of this device is not significantly changed.
  • this device is an integral part of a control unit of a converter valve, the reference voltage of which serves as the reference point of a measured variable.
  • the control unit receives two further connections for the measured variables and possibly three further connections for the energy supply.
  • This integration of the device for actual value acquisition means that no further space is required in the converter for the actual value acquisition.
  • the simplification of the device for recording the actual value not only saves costs, but also significantly increases the reliability of the overall system.
  • Figure 1 shows a block diagram of part of a power converter with a conventional transducer
  • Figure 2 is the block diagram of a first embodiment of the device according to the invention
  • Figure 3 shows a block diagram of Figure 1 with the device according to the invention in two forms.
  • phase 4 of the converter 2 contains two thyristors Th1 and Th2 connected in series with their associated freewheeling diodes FD1 and FD2.
  • the connection point 6 forms a converter output, to which a phase of a multiphase load, not shown, is connected.
  • a shunt resistor 10 is connected, which has two connections 12 and 14.
  • the DC-side connections of the phase module 4 of the converter 2 are included the DC-side connections P and N of the converter 2 electrically connected.
  • a control unit 16 or 18 is assigned to each thyristor Th1 or Th2 that can be switched off, also called GTO (gate turn-off) thyristor.
  • the control unit 16 or 18, also called the gate unit is electrically connected on the output side to a gate terminal G and a cathode terminal K of the GTO thyristor Th1 or Th2.
  • the control unit 16 or 18 is linked with its feedback signal connection 20 or 22 by means of an optical waveguide 24 or 26 to a control unit 28 of the converter 2 in an electrically isolated manner.
  • the control signal connection 30 or 32 of the control unit 16 or 18 is likewise linked to the control unit 28 by means of an optical waveguide 34 or 36.
  • control unit 16 or 18 has auxiliary power connections 38, 40 or 42, 44, to which an auxiliary power supply 46 or 48 is connected.
  • This auxiliary power supply 46 or 48 consists of an inverter 50 or 52 and an isolating transformer 54 or 56 for potential isolation of the different potentials of the control unit 28 and the converter 2. This potential isolation point is indicated in this block diagram by a dash-dot line 58.
  • a device 60 for actual value detection is arranged within the converter 2, the measured variable inputs 62 and 64 of which are electrically conductively connected to the DC-side connections P and N of the converter 2.
  • This device 60 is a commercially available magnetic sensor with Hall element 66 and electronics 68, which has a series resistor 70 to limit the current (LEM Current Transducer, Datapack, from Heme International).
  • the electronics 68 has 2 auxiliary power connections 72 and 74 and a measurement signal connection 76. These connections 72 to 76 are electrically conductively connected to the control unit 28. There the control unit 28 and the device 60 are at very different potential, the potential separation, also indicated by a dash-dot line 58, must take place within the device 60.
  • the known device 60 occupies a large space.
  • shielded lines between control unit 28 and converter 2 are required to transmit the auxiliary energy and the measured value in order to avoid malfunctions.
  • the voltage U1 ie the voltage drop across the GTO thyristor Thl, is measured. If the current il flowing out of the output 6 of the converter 2 is to be measured, the device 60 with its connections 62 and 64 must be electrically conductively connected to the connections 12 and 14 of the shunt resistor 10.
  • the total effort for the safe electrical separation at the dash-dot line 58 of the device 60 between the control unit 28 and the converter 2 is not only very high, but also takes up a considerable amount of space, which significantly increases the space requirement of the converter 2.
  • FIG. 2 shows an advantageous embodiment of the device 60 according to the invention for recording the actual value of a measured variable.
  • This advantageous embodiment consists of a measuring range adjustment 78, a measuring amplifier 80, a signal processing device 82 and an auxiliary energy supply unit 84.
  • the signal processing device 82 consists, for example, of an analog-digital converter 86 and a downstream modulator 88, the modulator 88 having a second signal input 90.
  • the measuring range adjustment 78 is on the input side with the measured variable inputs 62 and 64 and electrically connected on the output side to the measuring amplifier 80.
  • a voltage divider consisting of the two resistors 92 and 94 is provided, for example, as the measuring range adjustment 78, their connection point 96 forming the output of the measuring range adjustment 78.
  • the subsequent measuring amplifier 80 on the one hand amplifies the adjusted measured variable MW ′′ and on the other hand adjusts the measuring range adaptation 78 in impedance to the subsequent signal processing device 82.
  • This signal processing device 82 processes the analog actual value MW 'of the measured variable in such a way that this measured variable can be supplied to the control unit 28 on a predetermined transmission path. Since the control unit 28, for example in accordance with the essay "Microcomputer controls in traction vehicles using the example of SIBAS 16", is printed in the DE magazine “ZEV-Glas. Ann. 113 (1989), No. 4 April, pages 117-126)", is microcomputer controlled, the analog measurement signal MW 'must be in digital form. It is up to the user which commercial analog-digital converter 86 is used with which method.
  • the measurement signal to be transmitted which is present at the measurement signal connection 76 of the device 60, can also be analog, as a result of which the conversion into a digital value can also be carried out in the control unit 28.
  • the power supply to the measuring amplifier 80 and / or the signal processing device 82 is provided by the auxiliary power supply unit 84.
  • This supply unit 84 consists of an auxiliary transformer 100 and a rectifier circuit 102, which is connected on the input side to the outputs of the secondary winding 104 of the transformer 100.
  • the secondary winding 104 has a center tap 106 as a third connection.
  • This center tap 106 of the secondary winding 104 is also electrically conductively connected to the measured variable input 64.
  • This center tap 106 forms for the measuring range adjustment 78, the measuring amplifier 80 and the signal processing device 82 the reference potential, also called zero or ground potential number.
  • the rectifier circuit 102 is connected to the supply voltage connections of the measuring amplifier 80.
  • the modulator 88 Since the transmission channel for the feedback signal R1 or R2 of the gate unit 16 or 18 is to be used for the transmission of the measured variable to the control unit 28 in order to save another optical fiber as the transmission channel, the modulator 88 is required.
  • the feedback signal R1 or R2 is present at its second signal input 90.
  • the digitized measured variable MW and the feedback signal R1 and R2 are transmitted in a potential-isolated manner to the control unit 28 via the existing optical fibers 24 and 26 by means of a multiplex method.
  • a simple embodiment of the device 60 for actual value detection contains only one measuring range adjustment 78, one measuring amplifier 80 and one auxiliary power supply unit 84.
  • FIG. 3 shows a further embodiment of the device 60 for recording the actual value.
  • the auxiliary power supply unit 84 consists only of a rectifier circuit 102 and only the secondary winding 104 with its three outputs remained from the auxiliary transformer 100, which is assigned to the isolating transformer 56 as an additional insulated secondary winding 104.
  • FIG. 3 also shows that the device 60 for recording the actual value is integrated in the control unit 16 and 18, respectively.
  • the auxiliary power connections 72 and 74 of the device 60 are electrically conductively connected to the auxiliary power connections 38, 40 and 42, 44 of the control units 16 and 18.
  • the measured variable inputs 62 and 64 are the Device 60 led out of the control unit 16 and 18.
  • the integrated devices 60 of the control units of a second phase module 4 of the converter 2 could be used on the one hand to measure the actual value of a second phase current i2 and on the other hand for example the actual value of the temperature of the converter valves Thl, ..., Th6.
  • the inventive design of the device 60 for actual value detection means that no additional space is required in the converter 2 as for the commercially available device 60.
  • these simplifications save costs and increase the reliability of the overall system.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rectifiers (AREA)

Abstract

L'invention concerne un dispositif (60) permettant de détecter la valeur réelle d'une valeur mesurée à haut potentiel et son utilisation dans un convertisseur de courant (2) de grande puissance. Selon l'invention, ce dispositif (60) comprend un amplificateur de mesure (80) muni d'un système d'adaptation du champ de mesure (78) monté en amont et une unité d'alimentation en énergie auxiliaire (84) qui est reliée d'une part à l'amplificateur de mesure (80) et d'autre part au système d'adaptation du champ de mesure (78). Ce procédé permet d'obtenir un dispositif (60) capable de détecter la valeur réelle d'une valeur mesurée à haut potentiel, qui n'a plus à opérer lui-même une séparation de potentiel et dont l'encombrement se trouve par conséquent réduit. Sa construction simplifiée a permis d'en réduire les coûts et de renforcer la fiabilité de l'ensemble du système.
EP94907554A 1993-02-24 1994-02-11 Dispositif permettant de detecter la valeur reelle d'une grandeur mesuree a haut potentiel Withdrawn EP0686266A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94907554A EP0686266A1 (fr) 1993-02-24 1994-02-11 Dispositif permettant de detecter la valeur reelle d'une grandeur mesuree a haut potentiel

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP93102881 1993-02-24
EP93102881 1993-02-24
PCT/EP1994/000401 WO1994019700A1 (fr) 1993-02-24 1994-02-11 Dispositif permettant de detecter la valeur reelle d'une grandeur mesuree a haut potentiel
EP94907554A EP0686266A1 (fr) 1993-02-24 1994-02-11 Dispositif permettant de detecter la valeur reelle d'une grandeur mesuree a haut potentiel

Publications (1)

Publication Number Publication Date
EP0686266A1 true EP0686266A1 (fr) 1995-12-13

Family

ID=8212633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94907554A Withdrawn EP0686266A1 (fr) 1993-02-24 1994-02-11 Dispositif permettant de detecter la valeur reelle d'une grandeur mesuree a haut potentiel

Country Status (2)

Country Link
EP (1) EP0686266A1 (fr)
WO (1) WO1994019700A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103063912A (zh) * 2013-01-06 2013-04-24 四川省电力公司达州电业局 电能计量装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1063176A (fr) * 1976-03-04 1979-09-25 Robert H. Rehder Detection des grandeurs electriques dans des conducteurs
US4032843A (en) * 1976-06-21 1977-06-28 International Telephone And Telegraph Corporation Compensated signal isolator
DE2918069C2 (de) * 1979-05-04 1982-12-30 Silvin Marjan Dr. Ljubljana Leskovar Vorrichtung zur Fernmessung von Übertragungsdaten einer Hochspannungsleitung
DE3434607A1 (de) * 1984-09-18 1986-03-27 Siemens AG, 1000 Berlin und 8000 München Verfahren und vorrichtung zum betreiben eines abschalthyristors
DE3513170A1 (de) * 1985-04-12 1986-10-16 Siemens AG, 1000 Berlin und 8000 München Verfahren zum ansteuern ein- und ausschaltbarer leistungshalbleiterbauelemente und vorrichtung zur durchfuehrung des verfahrens

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9419700A1 *

Also Published As

Publication number Publication date
WO1994019700A1 (fr) 1994-09-01

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