This paper presents some novel discussions
on fully decentralized and semi-decentralized control
of fractional-order large-scale nonlinear systems with
two distinctive fractional derivative dynamics. First,
two decentralized fractional-order sliding mode controllers with different sliding surfaces are designed.
Stability of the closed-loop systems is attained under
the assumption that the uncertainties and interconnections among the subsystems are bounded, and the upper
bound is known. However, determining the interconnections and uncertainties bound in a large-scale system is troublesome. Therefore in the second step, two
different fuzzy systems with adaptive tuning structures
are utilized to approximate the interconnections and
uncertainties. Since the fuzzy system uses the adjacent
subsystem variables as its own input, this strategy is
known as semi-decentralized fractional-order sliding
mode control. For both fully decentralized and semidecentralized control schemes, the stability of closedloop systems has been analyzed depend on the sliding
surface dynamics by integer-order or fractional-order
stability theorems. Eventually, simulation results are
presented to illustrate the effectiveness of the suggested
robust controllers.