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In this paper a nonlinear control design for power balancing in networkedmicrogrids using energy storage devices is presented. Each microgrid isconsidered to be interfaced to the distribution feeder though a solid-statetransformer (SST). The internal duty cycle based controllers of each SSTensures stable regulation of power commands during normal operation. Butproblem arises when a sudden change in load or generation occurs in anymicrogrid in a completely unpredicted way in between the time instants at whichthe SSTs receive their power setpoints. In such a case, the energy storage unitin that microgrid must produce or absorb the deficit power. The challenge liesin designing a suitable regulator for this purpose owing to the nonlinearity ofthe battery model and its coupling with the nonlinear SST dynamics. We designan input-output linearization based controller, and show that it guaranteesclosed-loop stability via a cascade connection with the SST model. The designis also extended to the case when multiple SSTs must coordinate theirindividual storage controllers to assist a given SST whose storage capacity isinsufficient to serve the unpredicted load. The design is verified using theIEEE 34-bus distribution system with nine SST-driven microgrids.

Coordinated Control of Energy Storage in Networked Microgrids under Unpredicted Load Demands