WO1992009024A1 - Voltage regulator - Google Patents

Voltage regulator Download PDF

Info

Publication number
WO1992009024A1
WO1992009024A1 PCT/AT1991/000118 AT9100118W WO9209024A1 WO 1992009024 A1 WO1992009024 A1 WO 1992009024A1 AT 9100118 W AT9100118 W AT 9100118W WO 9209024 A1 WO9209024 A1 WO 9209024A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
microprocessor
voltage regulator
transformer
current
Prior art date
Application number
PCT/AT1991/000118
Other languages
German (de)
French (fr)
Inventor
Franz Gross
Original Assignee
Elin Energieversorgung Gesellschaft M.B.H.
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
Priority to ATA2340/90 priority Critical
Priority to AT234090 priority
Application filed by Elin Energieversorgung Gesellschaft M.B.H. filed Critical Elin Energieversorgung Gesellschaft M.B.H.
Publication of WO1992009024A1 publication Critical patent/WO1992009024A1/en

Links

Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10Regulating voltage or current
    • G05F1/12Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • G05F1/24Regulating voltage or current wherein the variable actually regulated by the final control device is ac using bucking or boosting transformers as final control devices
    • G05F1/247Regulating voltage or current wherein the variable actually regulated by the final control device is ac using bucking or boosting transformers as final control devices with motor in control circuit
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00Programme-control systems
    • G05B19/02Programme-control systems electric
    • G05B19/04Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423Input/output
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10Regulating voltage or current
    • G05F1/12Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • G05F1/14Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices
    • G05F1/147Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices with motor driven tap switch
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P13/00Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
    • H02P13/06Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output by tap-changing; by rearranging interconnections of windings

Abstract

The invention relates to a voltage regulator for regulating the output voltage of a transformer with a step switch. A microprocessor (1) operates as a digital tolerance range regulator. To it are connected at least two A/D converters (2); one of which is preferably connected to the secondary side of a voltage converter (7) and the other to the secondary side of a current converter (8), interfaces (9), where relay drivers (5) are preferably used as output interfaces and opto-couplers (11) as input interfaces, an alphanumeric display, preferably an LCD display, a master switch and adjustment components (4) by means of which changeable parameters can be called, adjusted and stored. The microprocessor detects the phase shift of the secondary signals of the current (8) and voltage (7) converters and finds cos ζ therefrom, and also calculates the frequency, efficiency, apparent power and reactive current from the processed or digitalised secondary signals. At a deviation of the transformer voltage from the set tolerance range on the preselected reference voltage, a delay stage in the microprocessor (1) responds and, after the delay has elapsed, the transformer step switch is reset accordingly if the actual voltage is still outside the tolerance range.

Description

VOLTAGE REGULATOR

The invention relates to a voltage regulator for regulating the output voltage at least of a transformer with Stufensσhalter.

It is known to adjust the tension for large transformers with a tap changer. This is located in the casing of the transformer and switches iσklungsteile the main winding .or the Regelwiσklung increases or decreases. In order to do this it is necessary to measure the voltage transformer on the side on which the Stufensσhalter located. This voltage value is compared in an analog voltage regulator with a voltage value and according to the solo Regeldif¬ Conference of the step switch is adjusted. For these devices the adjustment of the various parameters is, however, very complicated.

The object of the invention is now to create a new voltage regulator for Stufensσhalter of transformers, which is more accurate, reliable and can be integrated in modern digital control systems.

The object is achieved by the invention. This is characterized in da3 a is provided as a digital Toleranz¬ ribbon controller operating microprocessor andler to the at least two A / D, one of which is connected to the secondary side of a voltage transformer and the other to the secondary side of a current transformer,

Interfaces, being preferably as Ausgabeschnitt¬ provide relay driver and are provided as input interface optocoupler, an alphanumeric Anzei¬ ge, preferably an LCD display, a main switch and setting elements, with which changeable parameters invocation bar are adjustable and storable, connected, and da3 the microprocessor on the one hand detects the phase shift of the secondary signals of the current and voltage transformers and from the ~ o ~ (f determines> and on the other hand, is calculated from the processed or digitali¬ overbased secondary signals, the frequency, real power, the apparent power and the reactive current, and in that with a deviation of the voltage from the transformer set tolerance band to the selected voltage value to a delay stage in the microprocessor an¬ speaks and after expiration of the delay time, provided the voltage value is still outside the tolerance band, the Stufensσhalter of the transformer corresponding to v is created. This ensures that an adjustment of the Stufensσhalters only occurs when the actual voltage for a long time übersσhreitet a tolerance range. Furthermore, the operation of the voltage regulator through a small number of über¬ clear buttons and the LCD display is very comfortable.

It is advantageous that the values ​​for the current, the voltage and the phase shift between current and

Voltage are in each case after a constant time interval by the microprocessor, preferably always three times the hintereinan¬ detected. By repeated measurement after each cycle time falsσhe measurements are avoided.

Naσh one embodiment of the invention, the treatment stage is Verzöge¬ a counter with adjustable Höσhstwert, which emits a signal naσh Erreiσhen this Höσhstwertes, welσhes correspondingly actuates the relay for the motor drive of the tap changer of the transformer via a relay driver.

Naσh one embodiment, the delay time decreases inversely proportional to the magnitude of the exceeding or falling sσhreitung the limits of the voltage value from Toieranzbändes durσh, wherein the set delay time Verzöge¬ only occurs when the Abweiσhung from the voltage value corresponds exactly to the tolerance band. This is done depending on the size of the target actual value difference intervention of the regulator.

Another advantage is that a serial interface and / or an interface for an external display to the microprocessor is connected. About this Schnitt¬ imagine can be a display sσhlossen reasonable in a central control room.

It is advantageous that at Untersσhreiten a voltage not Sσhaltvorgänge of Stufensσhalters more lomark done, and that naσh a delay time a relay anspriσht which Schaltversuσhe is prevented during step switch and activated as long until the Span¬ voltage lower limit exceeded again. This is a so-called annungsblockierung Unters. In the same way a Überstrombloσkierung may be provided at the voltage regulator.

It is also advantageous that always the latest position of the tap changer of the transformer can be represented in the display. This is the default display on the display of the voltage regulator. A Umsσhaltung to other values ​​such. B. the current or the voltage can be effected with the adjusting members.

A zusätzliσhe embodiment is to be seen in that naσh each Sσhalthandlung a plausibility check is made welσhe from a review of Stufensσhal- terstellung, wherein the tap-changer at the smallest, largest and intermediate stage having a signal contact, welσhe at entspreσhender Stufensσhalterstel- averaging a signal to proposed for the microprocessor, and that this particular the tatsäσhliche, by the signal,

Stufensσhalterstellung with the determined internally in the microprocessor division step switch compares. According to the above additive in the tap changer the plausibility check can be carried out easily, so that the safety of the operation of the regulator is increased.

Finally, it is of advantage that the signal contacts are connected to a battery. This is necessary for the secure transmission of signals of the signaling contacts.

With reference to the Zeiσhnungen the invention will be explained in more detail noσh.

Fig. 1 shows the voltage regulator as Bloσksσhaltbild, Fig. 2 shows a voltage-time diagram for arrival εpreσhen of-two Verzogerungsstufen is, from FIG. 3 is a voltage-time diagram at Anspreσhen of only one delay stage ersiσhtlich and the flowchart of FIG. 4 shows the program flow when a target actual value difference.

In the Blocksσhaltbild of the voltage regulator in Fig. 1, a working as a digital tolerance band controller Mikro¬ is processor 1 can be seen at these at least two A / D converters 2 are connected, one of which the secondary side of a voltage transformer 7 and the other to the secondary side a current transformer is connected. 8 Furthermore, connected to the interfaces auσh Mikropro¬ cessor 1, being provided as an output interface relay driver 5 and as Eingabesσhnittstellen optocoupler. 6 An alphanumeric display 3, z. As an LCD display, a main switch 11 and four buttons 4 with which called variable parameters, adjustable and can be stored, are also connected to the Mikropro¬ cessor. 1 The microprocessor 1 detects one hand the Phasenversσhiebung the secondary signals of the current voltage converter 8 and 7 via the comparators 12, 13 and determines therefrom the cos ^. and on the other hand, the microprocessor from the processed and digitized secondary signals, the voltage 7 and current transformers 8 calculates the frequency, real power, the apparent power and the reactive current. In a deviation of the voltage from the transformer set tolerance band to the selected voltage value üsoii a Verzogerungsstufe in the microprocessor 1 responds. After expiry of the delay time, provided the voltage value is still outside the Uiβ Toleranzbandeε, the step-switch of the transformer is adjusted accordingly. This is done by switching on the motor drive 10 via a signal from the microprocessor. 1

The values ​​for the current, the voltage and the Phasenver- sσhiebung zwisσhen current and voltage are respectively naσh constant time intervals by the microprocessor 1, z. As always three times in succession, detected.

The Verzogerungsstufe is a counter in the microprocessor 1 with adjustable Höσhstwert, which emits a signal naσh Erreiσhen this Höσhstwertes which the relay 14 or 15 drives via the Relais¬ driver 5 for the motor driver 10 of the transformer Stufensσhalters accordingly.

A serial interface 9 and / or an interface for an external display processor 10 is also connected to the Mikro¬ 1. Further outputs 16, 17, 18, 19, 20, 21 are also provided for system messages. One of which gives a signal at an overcurrent, a case of overvoltage, and a place at a lower voltage. One of these outputs is used to indicate the maximum and minimum tap changer position for the system and a fault message.

For the plausibility check of the tap-changer position, the signal contacts are used which are supplied from the battery 25 22, 23, 24th With the signal contacts 26, 27, 28, a plausibility check of the motor drive can be made 10 degrees.

In Figs. 2 and 3 üsoix, <_ and Usoix, ". the

Tolerance band limit is. Tl is the delay time of a Verzogerungsstufe T2 and those of the second and Mt is the stage servo motor run time. From both Fig. Ersichtliσh that when a large Übersσhreitung the tolerance band, the delay time Tl is less than for a small Übersσhreitung. In FIG. 2, T2 is greater than 0 is selected, in which T2 occurs only when the control deviation is larger than two stages.

In Untersσhreiten a voltage lower limit no SσhaltVorgänge of Stufensσhalters longer take place, and a delay time naσh spriσht to a relay, welσhes Sσhaltversuche remains prevented the tap changer and so on until the voltage limit is exceeded again.

The program sequence, as shown in Fig. 4 is controlled by a watchdog K. When A is a ' "restart" and B, initialization is carried out. Only after verification of the measured input variables at C, the calculation of the required values ​​in D. occurs is then defined in E, whether the Stufensσhalter is operated or not. After expiry of the delay time is a Schalt¬ F treatment performed. At G a review of the information exchange and I control of input keys and the display is. The blocks H and I are each service of the previously checked hardware.

Claims

1. A voltage regulator for regulating the output voltage of at least one transformer tap changer, characterized in that a as a digital tolerance bandregier working microprocessor is provided, to which at least two A / D converter - of which preferably a andle to the secondary side of a voltage s, and a second is connected to the secondary side of a current transformer -, interfaces, preferably as Ausgabesσhnittstellen relay driver and as Eingabe¬ interfaces optocouplers are provided, an alphanumeric display, preferably an LCD display, a main switch and setting elements, with which unchangeable function parameter called, are adjustable and abspeicher¬ bar are angesσhlossen, and that the microprocessor detects the one hand Phasenversσhiebung the secondary signals of the current and voltage transformers and determines the cos <jp and the other part from the processed and digitized secondary signals, the frequency Active power that Sσheinleistung and the reactive current is calculated, and in that when a deviation of the Transforma¬ gate voltage of the set tolerance band for vorge selected voltage setpoint a Verzogerungsstufe in the microprocessor responsive and delay time after the Verzöge¬, provided the voltage value is still outside the tolerance band, the step switch the Trans¬ formators is adjusted accordingly.
2. A voltage regulator according to claim 1, characterized gekennzeich¬ net, that the values ​​for the current, the voltage and the phase shift between current and voltage in each case after a constant time interval by the microprocessor are always three times in succession, preferably sensed.
3. A voltage regulator according Anspruσh 1 or 2, dadurσh in that the Verzogerungsstufe is a counter with adjustable Höσhstwert, the naσh Erreiσhen this Höσhstwertes emits a signal welσhes the relay for the motor drive of the Stu¬ fensσhalters of the transformer controls entspreσhend via a relay driver.
4. Voltage regulator naσh at least one of Ansprüσhe 1 to 3, dadurσh in that the delay time is inversely proportional to the magnitude of exceeding or
Untersσhreitung the limits of the Tol ranzbandes durσh the actual voltage decreases, wherein the set Verzö¬ delay time occurs only when the voltage setpoint from Abweiσhung entspriσht precisely to the tolerance band.
5. Voltage regulator naσh at least one of Ansprüσhe 1 to 4, gekennzeiσhnet dadurσh that a serial
Interface and / or an interface for an external display is connected to the microprocessor.
6. A voltage regulator according to at least one of the Ansprüσhe 1 to 5, dadurσh gekennzeiσhnet that no Sσhaltvorgänge of the tap changer take place at Untersσhreiten a voltage lower limit more, and that naσh a Verzö¬ delay time, a relay anspriσht, welσhes Sσhaltversuσhe is prevented during Stufensσhalter and so on until the voltage lower limit is übersσhritten again.
7. A voltage regulator according to at least one of claims 1 to 6, characterized gekennzeiσhnet that always the latest position of the Stufensσhalters of the transformer can be represented in the display.
8. A voltage regulator according to at least one of the Ansprüσhe 1 to 7, dadurσh in that after each switching action, a plausibility check is made welσhe from a review of the tap-changer position, wherein the tap-changer at the smallest, largest and intermediate stage having a signal contact, welσhe at entspreσhender tap-changer position to emit a signal to the microprocessor, and in that this actual, as determined by the signal comparing step switch position with the determined internally in the microprocessor Stufenschalter¬ position.
9. A voltage regulator according to at least one of claims 1 to 8, characterized in that the signal contacts are angesσhlossen to a battery.
PCT/AT1991/000118 1990-11-19 1991-11-15 Voltage regulator WO1992009024A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ATA2340/90 1990-11-19
AT234090 1990-11-19

Publications (1)

Publication Number Publication Date
WO1992009024A1 true WO1992009024A1 (en) 1992-05-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT1991/000118 WO1992009024A1 (en) 1990-11-19 1991-11-15 Voltage regulator

Country Status (2)

Country Link
EP (1) EP0558532A1 (en)
WO (1) WO1992009024A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997001809A1 (en) * 1995-06-29 1997-01-16 Siemens Energy & Automation, Inc. Direct load current sensing for predicted regulator tap position
WO1997001808A1 (en) * 1995-06-29 1997-01-16 Siemens Energy & Automation, Inc. Load voltage based tap changer monitoring system
EP0764296A1 (en) * 1994-04-06 1997-03-26 Utility Systems Technologies, Inc. Load tap changer
WO2002065630A1 (en) * 2001-02-13 2002-08-22 Energy Saving 2000 S.A. System for controlling electrical loads, particularly lighting units
CN100342293C (en) * 2002-08-30 2007-10-10 沈阳新松机器人自动化股份有限公司 Analogue alternating current constant current source
DE102016002076A1 (en) * 2016-02-23 2017-08-24 Senvion Gmbh Internal demand regulation of a wind energy plant

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209737A1 (en) * 1982-03-17 1983-09-29 Wolff Reo Boris Von Gmbh Control circuit for voltage stabilisers
DE3236208A1 (en) * 1982-09-30 1984-04-12 Wabco Westinghouse Fahrzeug Electronic control for refuse vehicles provided with compression means
EP0129839A1 (en) * 1983-06-24 1985-01-02 Regulation Technology, Inc. Variable transformer and voltage control system
US4623834A (en) * 1984-07-06 1986-11-18 Oneac Corporation Dual programmable response time constants for electronic tap switching line regulators

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209737A1 (en) * 1982-03-17 1983-09-29 Wolff Reo Boris Von Gmbh Control circuit for voltage stabilisers
DE3236208A1 (en) * 1982-09-30 1984-04-12 Wabco Westinghouse Fahrzeug Electronic control for refuse vehicles provided with compression means
EP0129839A1 (en) * 1983-06-24 1985-01-02 Regulation Technology, Inc. Variable transformer and voltage control system
US4623834A (en) * 1984-07-06 1986-11-18 Oneac Corporation Dual programmable response time constants for electronic tap switching line regulators

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Siemens Review, Volume 45, No. 11, November 1978, Erlangen de pages 514-515; HELMUT LEIBOLD, HERBERT LUCKE: "6GC16 Voltage Controller with RMS-Value Measuring Feature for Tap-Changing Transformers" see the whole document. *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0764296A1 (en) * 1994-04-06 1997-03-26 Utility Systems Technologies, Inc. Load tap changer
EP0764296A4 (en) * 1994-04-06 1998-06-17 Utility Systems Technologies I Load tap changer
WO1997001809A1 (en) * 1995-06-29 1997-01-16 Siemens Energy & Automation, Inc. Direct load current sensing for predicted regulator tap position
WO1997001808A1 (en) * 1995-06-29 1997-01-16 Siemens Energy & Automation, Inc. Load voltage based tap changer monitoring system
AU700327B2 (en) * 1995-06-29 1998-12-24 Siemens Energy & Automation, Inc. Load voltage based tap changer monitoring system
WO2002065630A1 (en) * 2001-02-13 2002-08-22 Energy Saving 2000 S.A. System for controlling electrical loads, particularly lighting units
CN100342293C (en) * 2002-08-30 2007-10-10 沈阳新松机器人自动化股份有限公司 Analogue alternating current constant current source
DE102016002076A1 (en) * 2016-02-23 2017-08-24 Senvion Gmbh Internal demand regulation of a wind energy plant
EP3211746A1 (en) * 2016-02-23 2017-08-30 Senvion GmbH Energy requirement control system of a wind energy system

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Publication number Publication date
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