Coordinated Secondary Control for Balanced Discharge Rate of Energy Storage System in Islanded AC Microgrids

Yajuan Guan, Juan C. Vasquez, Josep M. Guerrero
2016 IEEE transactions on industry applications  
A coordinated secondary control approach based on an autonomous current-sharing control strategy for balancing the discharge rates of energy storage systems (ESSs) in islanded AC microgrids is proposed in this paper. The coordinated secondary controller can regulate the power outputs of distributed generation (DG) units according to their states-of-charge (SoCs) and ESS capacities by adjusting the virtual resistances of the paralleled voltage-controlled inverters. Compared with existing
more » ... th existing controllers, the proposed control strategy not only effectively prevents operation failure caused by overcurrent incidents and unintentional outages in DG units, but also aims to provide a fast transient response and an accurate output-current-sharing performance. A complete root locus analysis is given in order to achieve system stability and parameter sensitivity. Experimental results are presented to show the performance of the whole system and to verify the effectiveness of the proposed controller. Index Terms-Coordinated secondary control, energy storage system, balanced discharge rate, autonomous currentsharing control, microgrids Yajuan Guan (S'14) received the B.
doi:10.1109/tia.2016.2598724 fatcat:gyjbho3kinf5pklrxuhns35ana