US3621369A - Automatic voltage regulating apparatus for ac generator with antihunt means - Google Patents

Automatic voltage regulating apparatus for ac generator with antihunt means Download PDF

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Publication number
US3621369A
US3621369A US224A US3621369DA US3621369A US 3621369 A US3621369 A US 3621369A US 224 A US224 A US 224A US 3621369D A US3621369D A US 3621369DA US 3621369 A US3621369 A US 3621369A
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voltage
generator
output
automatic
automatic voltage
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US224A
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English (en)
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Masaomi Nagae
Sumio Yokokawa
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Fuji Electric Co Ltd
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Fuji Electric Co Ltd
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    • 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
    • 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
    • H02P9/36—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using armature-reaction-excited machines

Definitions

  • Japan Appl. No. 224 Filed Jan. 2, 1970 Patented Nov. 16, 1971 Assignee Fuji Denkl Sum Kabushiki Kaisha Kawasaki-slit, Kanagavva-ken, Japan Priority Jan. 9, I969 Japan 44/1844 AUTOMATIC VOLTAGE REGULATING APPARATUS FOR AC GENERATOR WITH References Cited- UNITED STATES PATENTS 2,913,656 H959 Bliss 322/19 X 3,474,323 i0/i969 Kilgore 6! al. 322/19 Primary Examiner-Oris L. Rader Assistant Examiner-4i.
  • An automatic voltage regulating apparatus for an AC generator comprising an instantaneous voltage change detecting means with a blind sector which acts to impart its output to the automatic voltage regulator only when the instantaneous voltage change thereof exceeds a predetermined QELLZ E value, provided in parallel with a voltage deviation detecting raw loop in an automatic voltage regulator for said generator,
  • lnt.Cl. 02p 9/14 transient response characteristic of said voltage regulator is Fieldotsearcli 322/19, 20, caused to increase only for a predetermined period in 24, 25, 28, 36, 59; 318/2044] response to said voltage change.
  • the present invention relates to an automatic voltage regulating apparatus comprising an automatic voltage regulator (hereinafter referred to as AVR) for an AC generator.
  • AVR automatic voltage regulator
  • an object of improving the transient response characteristic of an excitation system of an AC generator is to increase stability with increase of abnormal change of bus for voltage due to breakdown of the power system and to suppress voltage increase at the time of cutting off a load within 20 percent to 30 percent in the case where the generator is connected in parallel with the power system, and to suppress abnormal drop of the generator terminal voltage due to the rush current at the time of putting on a load and voltage buildup at the time of cutting off a load in the case where the generator is singly operated.
  • the characteristic of the AVR is sufficient to have the PI characteristic, but at the time of putting on and cutting off a load, the AVR with the Pl characteristic brings about drawbacks such that the voltage drop and the buildup factor of the voltage are too large, and also the voltage recovery time becomes longer.
  • An abject of the present invention is to improve the transient response characteristic of the excitation system for the AC generator without compensating for the time constant of the excitor directly or indirectly.
  • Another object of the present invention is to make it possible to employ an AVR having only PI characteristic as the excitation system for the AC generator.
  • a further object of the present invention is to minimize the voltage fluctuation and to shorten the voltage recovery time by adding a differentialcharacteristic to the AVR at the time of abnormal voltage fluctuation.
  • an automatic voltage regulating apparatus for AC generator which comprises an instantaneous voltage change detecting means with a blind sector, said means being provided in parallel with a voltage deviation detecting loop in an automatic voltage regulator for said AC generator and comprising a device adapted to increase a transient response characteristic of output of said automatic voltage regulator only for a predetermined period in response to an instantaneous voltage change of said generator when said voltage change becomes more than a predetermined value.
  • FIG. I is'a block diagram of one embodiment of the present invention.
  • FIG. 2 is a block diagram showing transmitting function of the voltage loop in the apparatus shown in FIG. 1;
  • FIG. 3 is a connection diagram of a partial circuit in the apparatus shown in FIG. 1;
  • FIGS. 4 through 6 are voltage, current-time characteristic diagrams for describing operation of the apparatus shown in FIG. 1.
  • an AC synchronous generator 3 which is parallelly operated with a power system I through a main transformer 2 is equipped with a rotary unit of excitation system consisting of a generator field winding 5, a bridge rectifier 6 and an AC excitor 7.
  • An excitation winding 8 of the AC excitor 7 is controlled by an AVR l6 and a main amplifier 17.
  • AVR 16 as aforementioned, comprises an automatic voltage regulator of any well-known conventional construction, one such construction contemplating the use of a conventional proportion and integration adjusting amplifier.
  • amplifier 17 is of any conventional known construction.
  • the power source voltage of the AVR l6 and main amplifier I7 is supplied by the generator bus bar through a transformer 9 for excitation power source.
  • the apparatus comprises a current transformer (CT) 10 for detecting output current of the generator 3, a potential transformer (PT) I l for detecting output voltage of the generator 3, a voltage deviation detecting unit 12 for detecting deviation between a set voltage and a real voltage obtained from the potential transformer 11, and a power factor deviation detecting unit I3 for detecting deviation between a set power factor and a real power factor, outputs of said detecting units l2, 13 being supplied to the AVR in the known manner.
  • Unit 12 may be of any conventional design similar to that of a difference amplifier, for example.
  • Unit 13 is also contemplated to comprise any known construction achieving the standard described function.
  • the apparatus comprises, additionally, a voltage change detecting unit 14 and a blind sector setting unit 15 provided by the present invention.
  • FIG. 2 The block diagram showing transmitting function of voltage loop in the normal condition mentioned above is shown in FIG. 2.
  • q is a voltage setting value, 2 is a generator terminal voltage, K, is a proportional gain of the AVR 16, T, is an integration time of the AVR 16, T is a time constant of the excitor, and T is an open-circuit time constant of the generator circuit.
  • FIG. 3 designates a circuit example of the voltage change detecting unit 14 and the blind sector setting unit 15 in F 1G. I, in which a voltage E, proportional to the generator terminal voltage is subjected to full wave rectification in a rectifier S,, the thus rectified voltage is obtained at a resistor r,,, and said rectified voltage is caused to pass a differential circuit consisting of a capacitor C and resistor r,, whereby any changed component of the voltage is detected and this changed component is supplied to a blind sector circuit consisting of a resistor r and Zener diodes Z and 2 which are reversely connected in series.
  • FIGS. 4 and 5 show variations of the values i E E and E with respect to time in the case when the generator terminal voltage E, changes stepwise by AE.
  • HO. 4 shows a variation of the above-mentioned values at the time of rapid decrease of the voltage E
  • FIG. 5 shows it at the time of rapid increase of the voltage E,.
  • the step change AB of the generator terminal voltage E becomes as follows.
  • the output voltage E of the blind sector setting unit becomes at the time of the rapid decrease of the voltage and at the time of the rapid increase of the voltage.
  • the output voltage E of the blind sector is supplied to the input of the AVR with a polarity as shown in the drawing, an increasing signal can be obtained at the time of the rapid decrease of the voltage and a decreasing signal can be obtained at the time of the rapid increase of the voltage.
  • the blind sector width E is preferably set to a value within 5 percent with respect to 100 percent of the generator voltage.
  • the AVR 16 operates stably as the Pl regulator.
  • FIG. 6 shows the output of the AVR for E, in connection with open loop, in which P represents the output of the AVR due to the proportional gain corresponding to the output of the voltage deviation detecting circuit 12 at the normal time, and l represents the output of the AVR due to an integration characteristic.
  • 100 percent output voltage of the voltage change detecting unit (reference numerals l4, 15 in FIG. 1) is preferably selected to approximately 10 times of the percent output voltage of the voltage deviation detecting unit (reference numeral 12 in FIG. 1) for the same change of the terminal voltage of the generator.
  • present invention is useful in improving the similar transient response characteristic not only to the brushless AC generator but also to general AVR apparatus.
  • An automatic voltage regulating apparatus for AC generator which comprises an AC generator, an automatic voltage regulator for adjusting field system of said AC generator, a voltage deviation detecting unit for detecting a deviation of output voltage of said AC generator from a set voltage, a first means for imparting an output of said detecting unit to an input of said automatic voltage regulator, a second means for detecting an instantaneous value of the terminal voltage of said generator, a third means for differentiating the output voltage of said second means, a fourth means for generating an output when the output voltage of said third means becomes more than a predetermme value in each of positive and negative polarities, and a fifth means for applying the output of said fourth means to an input of said automatic voltage regulator.
  • an automatic voltage regulating apparatus for AC generator which comprises an excitor of said AC generator and an automatic voltage regulator for controlling excitation of said excitor in response to output states such as output voltage, output current and output power factor of said AC generator; the improvement comprising additionally a voltage change detecting unit adapted to'detect the output voltage change of said AC generator and a blind sector setting unit connected at its input with the output side of said detecting unit and adapted to produce an output only when instantaneous voltage change detected by said detecting unit exceeds a predetermined value, the output side of said blind sector setting unit being connected at its output side with the input side of said automatic voltage regulator, thereby to increase a transient response characteristic of output of said automatic voltage regulator only for a period in response to an instantaneous voltage change of said generator when said voltage change becomes more than a predetermined value.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)
  • Feedback Control In General (AREA)
US224A 1969-01-09 1970-01-02 Automatic voltage regulating apparatus for ac generator with antihunt means Expired - Lifetime US3621369A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44001844A JPS4841326B1 (enrdf_load_stackoverflow) 1969-01-09 1969-01-09

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US3621369A true US3621369A (en) 1971-11-16

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US (1) US3621369A (enrdf_load_stackoverflow)
JP (1) JPS4841326B1 (enrdf_load_stackoverflow)
DE (1) DE2000584A1 (enrdf_load_stackoverflow)
GB (1) GB1282082A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916291A (en) * 1973-08-30 1975-10-28 Westinghouse Electric Corp Power generating arrangement employing synchronous dynamoelectric machine having improved dynamic and transient stability
US4376295A (en) * 1979-01-11 1983-03-08 Fuji Electric Co. Ltd. System for predicting desynchronization of a synchronous machine
WO1985002948A1 (en) * 1983-12-19 1985-07-04 Sundstrand Corporation Apparatus and method for detecting a rotating rectifier fault
US6265852B1 (en) * 1999-04-14 2001-07-24 Mitsubishi Denki Kabushiki Kaisha Excitation controller and excitation control method for stabilizing voltage in electric power system
US20040119437A1 (en) * 2002-12-19 2004-06-24 Mitsubishi Denki Kabushiki Kaisha Excitation controller
US6919712B1 (en) * 2000-06-19 2005-07-19 Mitsubishi Denki Kabushiki Kaisha Excitation control device and excitation control method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913656A (en) * 1958-01-10 1959-11-17 Westinghouse Electric Corp Sensing system for brushless type generator
US3474323A (en) * 1966-12-28 1969-10-21 Westinghouse Electric Corp Electrical control systems with stabilizing control means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913656A (en) * 1958-01-10 1959-11-17 Westinghouse Electric Corp Sensing system for brushless type generator
US3474323A (en) * 1966-12-28 1969-10-21 Westinghouse Electric Corp Electrical control systems with stabilizing control means

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916291A (en) * 1973-08-30 1975-10-28 Westinghouse Electric Corp Power generating arrangement employing synchronous dynamoelectric machine having improved dynamic and transient stability
US4376295A (en) * 1979-01-11 1983-03-08 Fuji Electric Co. Ltd. System for predicting desynchronization of a synchronous machine
WO1985002948A1 (en) * 1983-12-19 1985-07-04 Sundstrand Corporation Apparatus and method for detecting a rotating rectifier fault
US4595965A (en) * 1983-12-19 1986-06-17 Sundstrand Corporation Apparatus and method for detecting a rotating rectifier fault
US6265852B1 (en) * 1999-04-14 2001-07-24 Mitsubishi Denki Kabushiki Kaisha Excitation controller and excitation control method for stabilizing voltage in electric power system
US6919712B1 (en) * 2000-06-19 2005-07-19 Mitsubishi Denki Kabushiki Kaisha Excitation control device and excitation control method
US20040119437A1 (en) * 2002-12-19 2004-06-24 Mitsubishi Denki Kabushiki Kaisha Excitation controller
US6847184B2 (en) * 2002-12-19 2005-01-25 Mitsubishi Denki Kabushiki Kaisha Excitation controller

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DE2000584A1 (de) 1970-07-16
GB1282082A (en) 1972-07-19
JPS4841326B1 (enrdf_load_stackoverflow) 1973-12-06

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