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The Stirling co-generator studied in this paper is motorized by a free-piston Stirling engine. Its piston, which has an alternative linear motion, is the secondary (i.e. rotor) of a linear induction generator. The system is submitted to parameter uncertainties and sensor noise. This paper considers a comparison of two different controllers. One is designed using a pole placement methodology; the other involves H∞ techniques using coprime factors. The comparison examines both performance and stability robustness.
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