GB1509451A - Electrical installation comprising frequency changers - Google Patents

Electrical installation comprising frequency changers

Info

Publication number
GB1509451A
GB1509451A GB11091/75A GB1109175A GB1509451A GB 1509451 A GB1509451 A GB 1509451A GB 11091/75 A GB11091/75 A GB 11091/75A GB 1109175 A GB1109175 A GB 1109175A GB 1509451 A GB1509451 A GB 1509451A
Authority
GB
United Kingdom
Prior art keywords
voltage
load
frequency
frequency changers
star
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
GB11091/75A
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
Priority claimed from DE2415398A external-priority patent/DE2415398C3/en
Priority claimed from DE19752502513 external-priority patent/DE2502513A1/en
Priority claimed from DE2509177A external-priority patent/DE2509177C3/en
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1509451A publication Critical patent/GB1509451A/en
Expired legal-status Critical Current

Links

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
    • H02M5/271—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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output

Landscapes

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

Abstract

1509451 Frequency changing SIEMENS AG 17 March 1975 [29 March 1974 22 Jan 1975 3 March 1975] 11091/75 Heading H2F In a combination of frequency changers, e.g. for feeding an A.C. motor 6, an odd number m of frequency changers 1, 2, 3 or inverters are connected in a symmetrical m-phase star arrangement. At least one of said frequency changers (3) is provided with a control loop arranged so that the output voltage follows a trapezoidal reference waveform so that, when used with a balanced load 6, a corresponding voltage appears across the output of the other frequency changers. No direct connection is made between the load and the star point Mu so that at least two of the frequency changers 1, 2 are provided with current control loops so that the line currents are sinusoidal. As described, direct or intermediate D.C. frequency changers 1, 2, 3 are connected via transformer 4 to threephase mains 5. The outputs are connected in star with reference to a point Mu for feeding a synchronous or asynchronous motor 6 the star point Mm of which is not directly connected to the star point Mu. Frequency changer 3 is provided with a voltage control loop which monitors the voltage between load terminal T and the star point Mu and compares it with a trapezoidal reference waveform U3 of adjustable voltage; the error from comparator 19 is fed to a voltage controller 18 so as to determine the conduction angle of the frequency changer 3. Frequency changers 1 and 2 have current control loops respective to the difference between currents I1 and I2 and a sinusoidal reference current I1* and I2*. The mth (third, sixth, ninth &c.) harmonics in the currents cancel because of the balanced load 6. The use of a trapezoidal rather than sinusoidal voltage waveform enables greater fundamental output components to be achieved with given thyristors and is stated to improve the input voltage/ current phase relationship for the fundamental. Modifications.-In Fig. 7 (not shown) the trapezoidal voltage waveform for controlling the output voltage of converter 3 is derived by monitoring the voltage across one of the load terminals and the load neutral point and applying to a multiplier/limiter arrangement so as to clip off a portion of each half cycle lying between 37À5 and 142À5 degrees. The amplitude of this arrangement is regulated by rectifying the voltage between one load terminal and the load star point and comparing it with a desired reference (DC).
GB11091/75A 1974-03-29 1975-03-17 Electrical installation comprising frequency changers Expired GB1509451A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2415398A DE2415398C3 (en) 1974-03-29 1974-03-29 Circuit arrangement with a number of converters, in particular direct converters in star connection
DE19752502513 DE2502513A1 (en) 1975-01-22 1975-01-22 CIRCUIT ARRANGEMENT WITH A NUMBER OF INVERTERS, IN PARTICULAR DIRECT CONVERTERS IN STAR CONNECTION
DE2509177A DE2509177C3 (en) 1975-03-03 1975-03-03 Circuit arrangement with three converters with single-phase AC voltage output

Publications (1)

Publication Number Publication Date
GB1509451A true GB1509451A (en) 1978-05-04

Family

ID=27185863

Family Applications (2)

Application Number Title Priority Date Filing Date
GB50187/77A Expired GB1509452A (en) 1974-03-29 1975-03-17 Electrical installation comprising frequency changers
GB11091/75A Expired GB1509451A (en) 1974-03-29 1975-03-17 Electrical installation comprising frequency changers

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB50187/77A Expired GB1509452A (en) 1974-03-29 1975-03-17 Electrical installation comprising frequency changers

Country Status (6)

Country Link
JP (1) JPS5758865B2 (en)
FR (1) FR2275058A1 (en)
GB (2) GB1509452A (en)
IT (1) IT1034687B (en)
NL (1) NL7503076A (en)
SE (1) SE400431B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4993986A (en) * 1989-11-01 1991-02-19 Bloomfield Steven L Fuzz blower power tube
GB2330254A (en) * 1997-10-09 1999-04-14 Toshiba Kk Inverter system
WO2007048420A1 (en) * 2005-10-24 2007-05-03 Conergy Ag Inverter
EA015042B1 (en) * 2010-04-07 2011-04-29 Открытое Акционерное Общество "Нпо "Русский Электропривод" System for feeding and control of polyphase ac converter-fed motor
CN114024468A (en) * 2021-10-12 2022-02-08 新疆蓝山屯河能源有限公司 Motor load sharing control device and control method for annular feeder of calcium carbide furnace

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5523965Y2 (en) * 1976-04-30 1980-06-07
DE3029320A1 (en) * 1980-08-01 1982-03-04 Siemens AG, 1000 Berlin und 8000 München INVERTER WITH MULTI-PHASE OUTPUT AND EACH OWN CURRENT CONTROLLER FOR EACH OUTPUT
RU2581594C2 (en) * 2014-10-06 2016-04-20 Евгений Николаевич Коптяев Improved frequency down-converter
RU2639048C2 (en) * 2015-03-30 2017-12-19 Евгений Николаевич Коптяев Method of frequency conversion
RU2691635C2 (en) * 2018-10-29 2019-06-17 Евгений Николаевич Коптяев Double-channel frequency conversion method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4993986A (en) * 1989-11-01 1991-02-19 Bloomfield Steven L Fuzz blower power tube
GB2330254A (en) * 1997-10-09 1999-04-14 Toshiba Kk Inverter system
GB2330254B (en) * 1997-10-09 2000-10-18 Toshiba Kk Multiple inverter system
WO2007048420A1 (en) * 2005-10-24 2007-05-03 Conergy Ag Inverter
EA015042B1 (en) * 2010-04-07 2011-04-29 Открытое Акционерное Общество "Нпо "Русский Электропривод" System for feeding and control of polyphase ac converter-fed motor
CN114024468A (en) * 2021-10-12 2022-02-08 新疆蓝山屯河能源有限公司 Motor load sharing control device and control method for annular feeder of calcium carbide furnace

Also Published As

Publication number Publication date
SE7503441L (en) 1975-09-30
GB1509452A (en) 1978-05-04
JPS5758865B2 (en) 1982-12-11
FR2275058A1 (en) 1976-01-09
FR2275058B1 (en) 1981-12-18
IT1034687B (en) 1979-10-10
SE400431B (en) 1978-03-20
NL7503076A (en) 1975-10-01
JPS50140823A (en) 1975-11-12

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee