This paper presents a coordinated secondary control(CSC)strategy for distributed power management for an autonomous hybrid three-port AC/DC/DS microgrid.The proposed CSC is on top of a generalized primary control(GPC)...This paper presents a coordinated secondary control(CSC)strategy for distributed power management for an autonomous hybrid three-port AC/DC/DS microgrid.The proposed CSC is on top of a generalized primary control(GPC),which consists of local power sharing(LPS)control within an individual AC or DC subgrid,global power sharing(GPS)control throughout the AC/DC subgrids,and storage power sharing(SPS)control in a distributed storage(DS)network.The CSC along with the GPC uses the local frequency/voltage deviations and offers decentralized power management with enhanced overall reliability.To eliminate the inherent frequency/voltage deviations in GPC and restore to their nominal values,a secondary control is normally applied to all distributed generators(DGs),which would degrade the performance of decentralized power management.To overcome this concern,a CSC strategy is proposed to concurrently restore frequency/voltage and re-establish a distributed power management by means of limited information exchange through the low-bandwidth communication links.The proposed control scheme has been verified by both simulations and controller hardware-in-the-loop(CHIL)experiments in an OPAL-RT digital simulator system.展开更多
基金This work was supported in part by the National Research Foundation(NRF)Singapore under Grant S14-1186-NRFEIRP-IHL.
文摘This paper presents a coordinated secondary control(CSC)strategy for distributed power management for an autonomous hybrid three-port AC/DC/DS microgrid.The proposed CSC is on top of a generalized primary control(GPC),which consists of local power sharing(LPS)control within an individual AC or DC subgrid,global power sharing(GPS)control throughout the AC/DC subgrids,and storage power sharing(SPS)control in a distributed storage(DS)network.The CSC along with the GPC uses the local frequency/voltage deviations and offers decentralized power management with enhanced overall reliability.To eliminate the inherent frequency/voltage deviations in GPC and restore to their nominal values,a secondary control is normally applied to all distributed generators(DGs),which would degrade the performance of decentralized power management.To overcome this concern,a CSC strategy is proposed to concurrently restore frequency/voltage and re-establish a distributed power management by means of limited information exchange through the low-bandwidth communication links.The proposed control scheme has been verified by both simulations and controller hardware-in-the-loop(CHIL)experiments in an OPAL-RT digital simulator system.
