JPS55136883A - Synchronization-switching circuit of current-type inverter - Google Patents

Synchronization-switching circuit of current-type inverter

Info

Publication number
JPS55136883A
JPS55136883A JP4432579A JP4432579A JPS55136883A JP S55136883 A JPS55136883 A JP S55136883A JP 4432579 A JP4432579 A JP 4432579A JP 4432579 A JP4432579 A JP 4432579A JP S55136883 A JPS55136883 A JP S55136883A
Authority
JP
Japan
Prior art keywords
inverter
synchronization
line
phase
power supply
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.)
Pending
Application number
JP4432579A
Other languages
Japanese (ja)
Inventor
Daisaku Morinaga
Nobunori Matsudaira
Toshihito Chifuku
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4432579A priority Critical patent/JPS55136883A/en
Publication of JPS55136883A publication Critical patent/JPS55136883A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Ac-Ac Conversion (AREA)
  • Inverter Devices (AREA)
  • Motor And Converter Starters (AREA)

Abstract

PURPOSE:To prevent stress to a motor by providing a phase-locked oscillation-loop circuit, providing parallel-operation period of inverter-voltage operation and line- voltage operation in the case the power supply is switched from the inverter to the commercial power line. CONSTITUTION:When an inverter is actuated and the lower limit of a synchronization switching frequency domain is reached, a signal is outputted from a frequency- synchronization detecting circuit 29. Then, a phase-synchronization detecting circuit 28 begins to operate and chacking is performed with regard to the output of a phase- locked oscillation-loop circuit 21 whose phase and frequency are synchronized with a line power supply in the standby status. When the synchronization has been achieved, CTT2 is turned on through a delay circuit 30, and the inverter and the line power supply are parallelly operated. After the specified period, switching to the line poer supply is made by turning CTT1 off. Therefore, the parallel operation can be performed with the frequencies, phases, and voltages being coincided, and the switching can be accomplished, thereby the stress which might be applied to the motor and the inverter can be eliminated.
JP4432579A 1979-04-13 1979-04-13 Synchronization-switching circuit of current-type inverter Pending JPS55136883A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4432579A JPS55136883A (en) 1979-04-13 1979-04-13 Synchronization-switching circuit of current-type inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4432579A JPS55136883A (en) 1979-04-13 1979-04-13 Synchronization-switching circuit of current-type inverter

Publications (1)

Publication Number Publication Date
JPS55136883A true JPS55136883A (en) 1980-10-25

Family

ID=12688337

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4432579A Pending JPS55136883A (en) 1979-04-13 1979-04-13 Synchronization-switching circuit of current-type inverter

Country Status (1)

Country Link
JP (1) JPS55136883A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57178962A (en) * 1981-04-28 1982-11-04 Toyo Electric Mfg Co Ltd Simple changeover system for dual mode car
CN103066895A (en) * 2012-12-30 2013-04-24 青岛天信电气有限公司 Anti-explosion soft-starting synchronous seamless switching technology for mines
EP2621077A3 (en) * 2012-01-30 2017-09-06 LSIS Co., Ltd. Medium voltage inverter control apparatus and medium voltage inverter system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57178962A (en) * 1981-04-28 1982-11-04 Toyo Electric Mfg Co Ltd Simple changeover system for dual mode car
EP2621077A3 (en) * 2012-01-30 2017-09-06 LSIS Co., Ltd. Medium voltage inverter control apparatus and medium voltage inverter system
CN103066895A (en) * 2012-12-30 2013-04-24 青岛天信电气有限公司 Anti-explosion soft-starting synchronous seamless switching technology for mines

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