Control of a battery system to improve operation of a microgrid

This paper investigates the control strategies for a Li-Ion battery to operate in a microgrid. At the grid-connected mode, the battery follows real and reactive power commands while at the autonomous mode the battery provides voltage and frequency control. The contribution of this work is two-fold: (i) application of a detailed model of a Li-ion battery using a circuit based model with state of charge (SOC) included in modeling and control of a microgrid; and (ii) development of effective control strategies for a battery system to operate at both grid-connected and autonomous modes while monitoring its SOC. A test microgrid consisting of a converter interconnected battery, passive loads and an induction machine is built in PSCAD/EMTDC. Dynamic responses of the microgrid demonstrate the effectiveness of the control strategies.