Adaptative Secondary Control for Energy Storage in Island Microgrids

This paper proposes an adaptive secondary control to islanded microgrids focused on autonomy enhancement and power quality, thus establishing an increase in its survival upon being islanded and guaranteeing its operation within established limits. The proposed control defines the contribution parcel of each storage unit for the frequency regulation based on how much energy is available in each unit and the actual microgrids’ frequency level. The influence among dispatchable units is also analyzed. To validate the results of the proposed control model, the comparison between a traditional and the proposed secondary control strategy is made. The modified IEEE 34 bus system considering the insertion of energy storages devices is employed as the case studies. The analyses were held for three scenarios of communication infrastructure: without communication, with implicit communication, and with full communication. The results show great improvement in autonomy when the proposed control method is implemented.