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GB1446039A - Method for controlling a resonant circuit static frequency chanter - Google Patents

Method for controlling a resonant circuit static frequency chanter

Info

Publication number
GB1446039A
GB1446039A GB4223373A GB4223373A GB1446039A GB 1446039 A GB1446039 A GB 1446039A GB 4223373 A GB4223373 A GB 4223373A GB 4223373 A GB4223373 A GB 4223373A GB 1446039 A GB1446039 A GB 1446039A
Authority
GB
United Kingdom
Prior art keywords
inverter
cut
load
monitored
motors
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.)
Expired
Application number
GB4223373A
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 claimed from DE19722244757 external-priority patent/DE2244757C3/en
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of GB1446039A publication Critical patent/GB1446039A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
    • 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
    • H02M5/443—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 thyratron or thyristor type requiring extinguishing means
    • H02M5/45—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M5/4505—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 thyratron or thyristor type requiring extinguishing means 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
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H02P1/54—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting two or more dynamo-electric motors
    • H02P1/58—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting two or more dynamo-electric motors sequentially
    • 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
    • H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
    • H02P2201/03—AC-DC converter stage controlled to provide a defined DC link voltage

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Abstract

1446039 Automatic control of converters LICENTIA PATENT-VERWALTUNGS GmbH 7 Sept 1973 [8 Sept 1972] 42233/73 Heading G3R [Also in Division H2] In a method of controlling a resonant circuit static frequency changer feeding rotary field machine 5, the cut-off times of the valves of the inverter 3 are monitored at 20 and a reactive current converter 8 adjusted so as to keep constant the cut-off times. Cut-off time is defined as the time between zero crossing of the anode current and the return of positive blocking voltage. The system is applicable to maintaining constant speed of hysteresis motors 5 in a gas centrifuge. The motors 5 are powered by a frequency changer 1, 2, 3 in which the three phase mains are rectified at 1 to provide an intermediate D.C. 2 which feeds an inverter 3. Each motor 5 has its own power factor correcting capacitors 6, common capacitors 7 being connected across the output of the inverter 3 so that the load is inherently capacitive. The reactive load is corrected by a naturally commutated reactive current converter 8 which provides an inductive load in dependence on its conduction angles. The inverter 3 is driven at a constant frequency by pulses from 10, 11. The cut-off time of the inverter valves is monitored at 20 and compared with a reference t L soll, the error being further compared with a reactive current component I B and the conduction angle controlled so as to maintain constant the cut-off times of the inverter 3. Starting. The motors 5 are brought up to speed in stages by a separate starter static frequency converter, the inverter 3 being started on the load 7, 8 before the motor 5 is switched in. Automatic Current and Voltage Control. The inverter output voltage is monitored at 12 and compared with a desired value U soll , the error voltage being amplified at 13 and 18 and used to control the conduction angle of the rectifier 1. A current component is introduced by rectifier 24 and a further rate of change of current component is provided by differentiator 15 so as to provide improved response to change in load.
GB4223373A 1972-09-08 1973-09-07 Method for controlling a resonant circuit static frequency chanter Expired GB1446039A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722244757 DE2244757C3 (en) 1972-09-08 Method for keeping the speed constant of three-phase machines fed by a converter containing a resonant circuit inverter

Publications (1)

Publication Number Publication Date
GB1446039A true GB1446039A (en) 1976-08-11

Family

ID=5856134

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4223373A Expired GB1446039A (en) 1972-09-08 1973-09-07 Method for controlling a resonant circuit static frequency chanter

Country Status (2)

Country Link
GB (1) GB1446039A (en)
NL (1) NL7312349A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4555750A (en) * 1981-09-22 1985-11-26 Susumu Matsumura Control apparatus for D.C. power transmission system
GB2322981A (en) * 1997-03-07 1998-09-09 Cegelec Controls Ltd Power supply circuits for power factor correction

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4555750A (en) * 1981-09-22 1985-11-26 Susumu Matsumura Control apparatus for D.C. power transmission system
GB2322981A (en) * 1997-03-07 1998-09-09 Cegelec Controls Ltd Power supply circuits for power factor correction
GB2322981B (en) * 1997-03-07 2001-02-21 Cegelec Controls Ltd Power supply circuits

Also Published As

Publication number Publication date
DE2244757B2 (en) 1976-01-29
DE2244757A1 (en) 1974-03-28
NL7312349A (en) 1974-03-12

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee