The authors describe how we are seeing a major technology change in the movement away from analog control to digital control of synchronous generators. An excitation system is now reduced to a single integrated assembly that includes the automatic voltage regulator (AVR), field current regulator (manual control), excitation limiters and even protection. Reliability is enhanced as multiple devices are implemented into the single component with multitasking microprocessors. This paper highlights a classic digital excitation system interconnected in a generator system.
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Schaefer et al. (2001) studied this question.
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