Optimal solar array configuration and DC motor field parameters for maximum annual output mechanical energy

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Abstract
A procedure is presented for the proper design of systems comprising photovoltaic solar generators directly supplying DC motors. The method is based on maximizing the total annual gross mechanical energy delivered to a mechanical load with a given torque-speed characteristic. The seasonal variations of both the isolation level and the ambient temperature are taken into account. The proposed technique is applied to two practical case studies, and the resulting optimal design parameters are compared with those available in the literature. A comparison is also made between the optimal separately excited and series motor design alternatives regarding the annual gross mechanical output energy.

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