This paper proposes a voltage control strategy for islanded
operation of dispatchable electronically coupled distributed
energy resource (DER) systems, for remote (off grid) electrification
systems. The proposed control strategy is based on fractional-order
sliding-mode control, offers black-start functionality, maintains
the quality of the output voltage of the host DER system in spite
of unbalanced and/or distorted load currents, and ensures protection
of the power-electronic interface to external faults. Moreover,
the fractional derivative order of the controller can be used as an
additional tuning parameter. Performance of the proposed control
strategy is demonstrated through time-domain simulation of
single- and multi-DER islanded networks, starting from blackstart
and subjected to various operating scenario, and it is also
compared to the performance of a proportional-integral (PI)-based
control strategy