Consensus Algorithm-Based Distributed Generator Sharing for Isolated Heterogeneous Microgrids

Abstract

The expanding use of Renewable Energy Sources (RES) has introduced a new concept of microgrids, suggested in this work as heterogeneous microgrids (HMGs). HMGs comprise single-phase and three-phase RES-based distributed generators (DGs) operating together within the same microgrid to supply linear and nonlinear loads. The connection of single-phase loads, especially nonlinear ones, leads to imbalances and harmonic distortions in currents and, consequently, in asymmetric and distorted voltages. This paper presents a novel secondary control method based on consensus algorithms and symmetrical components to achieve phase-power sharing among DGs in HMGs. The symmetrical components enable the implementation of virtual impedance loops, allowing independent control of the negative and zero sequence components provided by the DGs, regardless of their topology (single-phase or three-phase). Moreover, the consensus algorithm establishes an agreement regarding voltage and frequency regulation among the DGs operating in the HMG, thereby promoting equal power sharing among the DGs phases. Finally, the proposed methodology effectiveness is validated by the simulation results.