Learning Optimal Power Flow value functions with input-convex neural networks

The Optimal Power Flow (OPF) problem is integral to the functioning of power systems, aiming to optimize generation dispatch while adhering to technical and operational constraints. These constraints are far from straightforward; they involve intricate, non-convex considerations related to Alternating Current (AC) power flow, which are essential for the safety and practicality of electrical grids. However, solving the OPF problem for varying conditions within stringent time-frames poses practical challenges. To address this, operators often resort to model simplifications of varying accuracy. Unfortunately, better approximations (tight convex relaxations) are often still computationally intractable. This research explores machine learning (ML) to learn convex approximate solutions for faster analysis in the online setting while still allowing for coupling into other convex dependent decision problems. By trading off a small amount of accuracy for substantial gains in speed, they enable the efficient exploration of vast solution spaces in these complex problems. •The paper investigates Input Convex Neural Networks (ICNN) for OPF value function approximation.•Strengthened theoretical guarantees on the generalization performance of ICNNS are presented.•ICNNs consistently approximate system costs, gaps