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The Transactions P of the Korean Institute of Electrical Engineers

Korean Journal of Air-Conditioning and Refrigeration Engineering

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Title	Improvement of Transient Characteristics of Brush-less Type Synchronous Generator for Emergency Driven by Internal-Combustion Engine
Authors	안영주(An, Young-Joo)
DOI	https://doi.org/10.5370/KIEEP.2016.65.4.268
Page	pp.268-272
ISSN	1229-800X
Keywords	Synchronous generator ; AVR ; Output voltage ; Main field
Abstract	A brush-less type synchronous generator is driven by an internal-combustion engine that is used for emergency source. This kind of generator has to maintain output voltage in a range of some degree under the abrupt load irregular conditions such as a full load trip. This paper suggests a suppression method of increasing the output voltage over the rating. Automatic voltage regulator detects excessive rising of output voltage of the generator and supplies the signals to a switch installed in the rotating exciter through the photo-coupler. The current of main field rapidly decreases by additional resistor of the main filed circuit. Therefore, the output voltage of the generator is maintained effectively. The experimental results verified that the excessive value of the output voltage is limited in the range of 7% of the rated voltage.

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