Sliding Modes for Voltage Regulation and Current Sharing in DC Microgrids

In this paper a novel distributed control algorithm
for voltage regulation and current sharing in Direct Current
(DC) microgrids is proposed. The DC microgrid is composed
of several Distributed Generation units, interfaced with Buck
converters, and unknown current loads. The proposed control
strategy exploits a communication network to achieve current
sharing using a consensus-like algorithm. Voltage regulation is
achieved by constraining the system to a suitable manifold. A
third order Sliding Mode controller is developed to reach the
desired manifold in a finite time. The proposed control scheme is
formally analyzed, proving the achievement of current sharing,
while guaranteeing that the average voltage of the microgrid is
identical to the average of the voltage references.