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An effective straightforward method to design digital excitation and stabilizer controls for generating units is presented. The excitation controller is designed in the S-domain with a proportional plus integral (PI) effect and then transformed to the Z-domain using a step invariance technique. The stabilizer is also designed in the S-domain by pole-zero placing techniques and mapped to the Z-domain to obtain the digital equivalent. Both controllers are feasible for implementation by simple software and therefore suitable for on-line computer control applications. Simulation study results on a laboratory size generator are presented to show the merits of the controllers obtained. The actual hardware design and implementation study results are presented in the companion part II of this paper.
Date of Publication: Aug. 1987