Multi‐zonal method for cascading failure analyses in large interconnected power systems

Most cascading failure analysis methods successfully capture developments within one control zone, or region comprised of multiple zones, controlled by a single transmission system operator (TSO). They neglect, however, the operations multi-zonal systems. To bridge this gap, authors introduce method for analyses large interconnected power The accounts all zones in system, assesses their flows, re-evaluates topology after disturbances and applies frequency balancing measures each zone independently, thus effectively simulating actions TSOs. demonstrate capabilities method, case study is investigated which compares security benefits (national) versus single-zone (regional) system. application to IEEE 118-bus test shows that regional approach increases small medium cascades, whose expected demand not served reduced 28% 26%, respectively, comparison national approach. However, load shedding large-scale events 42 times as This mainly caused overloads occurring lines adjacent cross-zonal tie lines, are 154% higher with compared events. capability identify congestions presented devising an upgrading strategy, makes viable from aspect.