New multi-processor digital excitation system

This paper presents a new digital excitation system that uses a digital signal processor for the required computational speed of the advanced control functions and algorithms, and an integrated communications controller for implementation of event recording, data logging and a user friendly PC interface. This digital excitation system is scalable to generation units of all sizes, with minimal changes except to the power electronics and the excitation transformer. A wide range of settings for limiters and regulators is provided to meet the requirements of most utility power generation applications. Block diagrams of the hardware for a single channel system are presented. The regulator and limiter functions are outlined, and the transient event recorder, data logger, user interface, and self-diagnostics are described. A software tool to change settings for the various limiting and protection functions, download new system firmware, and retrieve diagnostic information is also described