This paper proposes multi-level PV system; three PV generators each coupled to a buck cell. Each PV-generator-buckconverter
channel is controlled such that maximum power is captured independently under different irradiation and temperature levels. The system operation under
normal/abnormal conditions is investigated by thoroughly mathematical and simulation work.
Hafez, A.; Montesinos-Miracle, D.; Sudrià, A. Autonomous cascaded PV system. "Journal of engineering sciences", 14 Novembre 2011, vol. 1, p. 243-250.