Optimal Power Flow models in Lirion operate in sinusoidal steady state — they describe the time-averaged behavior of an electrical network at a single operating point, ignoring the millisecond-to-second timescale phenomena studied in power-system dynamics.
This is a deliberate scope choice. OPF is fundamentally an economic-dispatch problem: its decisions live on the timescale of market settlement (minutes to hours), not on the timescale of electromechanical oscillations (milliseconds). Coupling OPF directly to transient dynamics would be both computationally prohibitive and conceptually mismatched. Dedicated tools — PowerSimulationsDynamics.jl in Julia, PSS/E, ANATEM, DIgSILENT — exist for that purpose.
Lirion's outputs frequently serve as the operating point fed into such dynamic studies. The two domains are complementary, not competing.
— Full content of this page (timescale hierarchy, when the assumption breaks, references to dynamic-studies tools) is under active editorial work and will be expanded shortly.