TY - GEN
T1 - Discharge rate balancing control strategy based on dynamic consensus algorithm for energy storage units in AC microgrids
AU - Guan, Yajuan
AU - Meng, Lexuan
AU - Li, Chendan
AU - Vasquez, Juan C.
AU - Guerrero, Josep M.
PY - 2017/3
Y1 - 2017/3
N2 - A dynamic consensus algorithm-based coordinated secondary control with an autonomous current-sharing control strategy is proposed in this paper for balancing discharge rate of energy storage systems (ESSs) in an islanded AC microgrid. The dynamic consensus algorithm is applied for information sharing between distributed generation (DG) units in order to regulate the output power of DGs according to ESS capacities and state-of-charge (SoC). The proposed controller can not only effectively prevent operation failure caused by over current and unintentional outage of DGs by means of balanced discharge rate control, but also provide fast response and accurate current sharing performance due to an autonomous current-sharing controller at primary level. In addition, expandability, flexibility and high reliability can be obtained thanks to the distributed architecture. Based on the developed linearized state-space model in z-domain, both the system stability and parameter sensitivity were analyzed. A comparison between experimental results obtained from using the conventional power sharing control and those obtained from the proposed coordinated control using a setup with three 2.2 kW DG units are presented to verify the effectiveness of the proposed controller.
AB - A dynamic consensus algorithm-based coordinated secondary control with an autonomous current-sharing control strategy is proposed in this paper for balancing discharge rate of energy storage systems (ESSs) in an islanded AC microgrid. The dynamic consensus algorithm is applied for information sharing between distributed generation (DG) units in order to regulate the output power of DGs according to ESS capacities and state-of-charge (SoC). The proposed controller can not only effectively prevent operation failure caused by over current and unintentional outage of DGs by means of balanced discharge rate control, but also provide fast response and accurate current sharing performance due to an autonomous current-sharing controller at primary level. In addition, expandability, flexibility and high reliability can be obtained thanks to the distributed architecture. Based on the developed linearized state-space model in z-domain, both the system stability and parameter sensitivity were analyzed. A comparison between experimental results obtained from using the conventional power sharing control and those obtained from the proposed coordinated control using a setup with three 2.2 kW DG units are presented to verify the effectiveness of the proposed controller.
KW - AC microgrids
KW - Balanced discharge rate
KW - Coordinated secondary control
KW - Dynamic consensus algorithm
KW - Energy storage units
UR - http://www.scopus.com/inward/record.url?scp=85019993643&partnerID=8YFLogxK
U2 - 10.1109/APEC.2017.7931093
DO - 10.1109/APEC.2017.7931093
M3 - Article in proceeding
AN - SCOPUS:85019993643
T3 - IEEE Applied Power Electronics Conference and Exposition (APEC)
SP - 2788
EP - 2794
BT - Proceedings of the 2017 IEEE Applied Power Electronics Conference and Exposition (APEC)
PB - IEEE Press
T2 - 2017 IEEE Applied Power Electronics Conference and Exposition (APEC)
Y2 - 26 March 2017 through 30 March 2017
ER -