Anti-islanding protection systems for synchronous machine...

Electricity: single generator systems – Automatic control of generator or driving means – Electrical conditions in circuit other than that of...

Reexamination Certificate

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C322S036000, C307S032000

Reexamination Certificate

active

10966665

ABSTRACT:
A system for providing anti-islanding protection of a synchronous machine based distributed generator includes a frequency sensor configured to generate a generator frequency signal, a bandpass filter configured for filtering the generator frequency signal, a governor controller configured for using the filtered frequency signal to generate a power feedback signal, and a governor summation element configured for summing the filtered frequency signal, the power feedback signal, and a reference power to provide an electrical torque signal. Another system includes a voltage sensor configured to generate a generator terminal voltage signal, a feedback power calculator configured for generating a reactive feedback power signal, a bandpass filter configured for filtering the terminal voltage signal, and a PI controller summation element configured for summing the filtered terminal voltage signal, the reactive power feedback signal, and a reference reactive power to provide an error signal.

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SK Salman, et al, Monitoring Changes in System Variables Due to Islanding Condition and Those Due to Disturbances at the Utilities Network, 1999 IEEE, pp. 460-465.
MA Redfern, et al, “Protection Against Loss of Utility Grid Supply for a Dispersed Storage and Generation Unit”, IEEE Trans on Power Delivery, vol. 8, No. 3, Jul. 1993.

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