HyDistFlow.jl: A unified dynamic hybrid AC/DC power flow package for DER-rich distribution systems

Modern distribution networks are being transformed into hybrid AC/DC active systems through large-scale deployment of converter-interfaced resources (photovoltaic generators, battery energy storage systems). Existing open-source time-series power flow tools lack unified medium/low-voltage DC modeling, multi-mode converter control, and endogenous multi-interval scheduling, which limits hybrid analysis. To address this gap, the open-source HyDistFlow.jl package (Julia) is introduced for accurate and efficient hybrid distribution studies. A unified component model set for AC, DC, and coupling interfaces is provided, where distributed generation and battery storage systems are explicitly represented. Seven consistent voltage source converter control modes are implemented for AC/DC converters. Endogenous scheduling automatically generates storage charge/discharge profiles under network constraints. Switching topology changes in medium/low-voltage distribution networks are accommodated in an engineering-oriented manner. CPU/GPU heterogeneous computation is enabled for scalable computation. Accuracy has been benchmarked against open-source AC solvers and ETAP hybrid AC/DC results, while functional correctness of all control modes and automatic loss-reducing storage dispatch has been demonstrated in designed studies.