A practical under-voltage load shedding strategy for regional power grid considering multiple operating modes

Abstract Nowadays, under-voltage load shedding (UVLS) schemes in China’s regional power grids are often drafted according to one certain operating mode, and then been chosen by experienced technicians based on comparison between simulation results on various operating modes. This process seriously depends on the skill and experience of the technician, and cannot guarantee the safety under some circumstances. Considering the above issues, this paper proposes a configuration method of UVLS applying to distributed control systems, and an automatic scheme formulating process. Specifically, aiming at developing a strategy suitable for multiple operating modes, Analytic Hierarchy Process (AHP) is introduced to obtain the fuzzy comprehensive sensitivities of the buses. The transient voltage stability of a regional power grid is investigated and the UVLS strategy is studied, which indicates the validity and practicality of the proposed configuration method.