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Autonomous Power Sharing Schemes for Series-Cascaded DC Microgrid

This paper presents a new DC microgrid topology, formed by series-cascaded dispatchable distributed generations (DGs), which offers the potential benefits of reduced power conversion stages and control flexibility. Two main power sharing schemes are introduced for control and management of series-cascaded microgrid: a simple voltage-based scheme for accurate proportional power sharing among the cascaded DGs, and a cost-weighted droop scheme for decentralized economic operation. Moreover, in contrast to the existing approaches for parallel-connected DGs based microgrids, the proposed control strategies operate autonomously and maintain the microgrid voltage to a nominal value under different load operating conditions. The expected performance of the proposed schemes has been extensively verified in simulation for various load operating scenarios.