Regional Frequency Stability Constrained Resilience Enhancement Strategies for Distribution Systems with Flexible Energy Resources

Extreme weather can easily trigger emergency faults in distribution networks, which in turn can have a significant impact on the frequency within the region, compromising the stable and reliable operation of the power grid during disasters. Traditional resilient distribution networks' flexible energy resource (FERs) allocation and scheduling strategies primarily focus on the steady-state operation before and after faults, with little consideration for the impact of unbalanced currents on regional frequency during the dynamic process when lines are disconnected, leading to potential frequency violations. this paper proposes a resilience enhancement strategy for distribution network systems with FERs that incorporates regional frequency stability constraints. With the dual objectives of optimizing resilience enhancement and minimizing economic costs, the distribution network system is strategically employed to regulate the mobility scheduling of FERs, thus establishing a comprehensive resilience enhancement model. By harnessing the capabilities of numerical simulation techniques, a linear representation of the Rate of Change of Frequency (ROCOF) and the frequency nadir in regions affected by faults is achieved, which significantly reduces the complexity of model resolution and aids in the formulation of a resilience enhancement strategy for distribution network flexible resources, taking into account constraints associated with regional frequency stability. The efficacy of the proposed method is corroborated through its application to the IEEE 33-node distribution network system.