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A distributed control strategy for coordination of an autonomous LVDC microgrid based on power-line signaling

Abstract:

In a microgrid (MG), an energy management control is essential in order to handle the variety of prime movers, which may include different types of renewable energy sources (RESs) and energy storage systems (ESSs). Specifically, the recharging process of the secondary battery, i.e., the most prominent ESS, should be done in a specific manner to preserve its lifetime, the common MG bus voltage must be kept within the bounds, and the energy offered by RES should be utilized as efficiently as possible. This paper proposes a method for coordination of an autonomous low-voltage direct-current (LVDC) MG that consists of a number of sources using power-line signaling (PLS), which is a distributed control strategy in which the units inject sinusoidal signals of specific frequency into the common bus in order to communicate with each other. The control structure that allows the application of this method is revealed …