Electricity: single generator systems – Automatic control of generator or driving means – Power factor or phase relationships
Patent
1996-05-31
1998-09-15
Stephan, Steven L.
Electricity: single generator systems
Automatic control of generator or driving means
Power factor or phase relationships
322 58, 307 73, H02P 910
Patent
active
058084495
ABSTRACT:
A method for detecting islanding operation of a rotating-machine type dispersed generator. The dispersed generator is interconnected with a main electric source through a circuit breaker to constitute an electric power system. The estimating method is implemented as follows: (a) changing electric power of the electric power system; (b) detecting frequency component of the electric power; and (c) deciding that an islanding operation of the dispersed generator is executed if the change of the frequency component becomes greater than a predetermined value. With this method, it becomes possible to detect the islanding operation of the dispersed generator even if the power flow at the interconnecting circuit breaker is generally zero.
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Fujimoto Toshiaki
Hirayama Yoshiyuki
Imai Yasutomo
Kai Takaaki
Kaneda Hirotoshi
Kabushiki Kaisha Meidensha
Ponomarenko Nicholas
Stephan Steven L.
The Tokyo Electric Power Company
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