Pre-disaster and mid-disaster resilience improvement strategy of high proportion renewable energy system considering frequency stability

Abstract

This paper aims to investigate the influence of dynamic system frequency changes on the resilience improvement process of high proportion renewable energy systems (HPRES). To this end, a module mobile energy storage system (MMESS) is considered to participate in primary frequency modulation and two types of system frequency stability constraints are established to guarantee the safety of frequency nadir and maximum frequency drop rate. Furthermore, taking into account the uncertainty of fault components caused by extreme weather, a two-stage stochastic mixed-integer programming (SMIP) is proposed for pre-disaster preventive control. By using progressive hedging method, generator and MMESSs scheduling plans can be converged after multiple iterations. For a deterministic fault scenario, a single-stage mixed-integer linear programming is adopted for mid-disaster emergency dispatch. Based on results from pre-disaster process, generators and MMESSs are coordinated to optimize load reduction while ensuring system frequency stability. Finally, case studies are conducted to demonstrate that the proposed strategy can effectively improve HPRES resilience while reducing renewable energy threat to frequency stability.