Approximate Load Models for Conic OPF Solvers

The global optimum of the optimal power flow (OPF) problem can be sought in various practical settings by adopting conic relaxations, such as second order cone programs (SOCPs) and semi-definite (SDPs). However, ZIP (constant impedance, constant current, power) exponential load models are not directly amenable with these solvers. Thus, mostly treated loads literature. In this letter, we propose two simple methods to approximate static good accuracy. proposed perform much better than traditional approximation.