Transient security control for bulk power system with selection of aggregated distributed energy resources

Abstract Amongst the background of the demand of modern society for renewables and decarbonisation, the gradual penetration of distributed energy resources (DER) has been observed. While many DER studies have centered on reliability and economic issues, there is a scarcity of research on the possible grid support that aggregated DER could provide to bulk electric systems (BES). In the present paper, a novel control scheme acting with optimally selected DER aggregations (DERAs) is proposed to prevent transmission cascading from overcurrent protection in transient process. The security control scheme is obtained by reshaping a transient energy function, where the energy function not only characterises the nominal dynamic behaviour of the power system transient, but also depicts transmission tripping caused by the overcurrent. On the basis of the availability and capability thereof, the participating DERAs are selected via a sparse matrix, which is solved with linear matrix inequalities (LMIs) in the form of semi-definite programming (SDP) without the linearisation of the system model. Test examples are provided with IEEE standard 14 and 118 Bus Systems.