Reevaluation of induction motor loss models for conventional and harmonic power flow

In conventional and harmonic power flow analysis, three-phase induction motors are typically modeled using constant parameters (power or impedance). Such models do not fully capture the impact of voltage deviation, unbalance, and harmonics on motor losses. This paper discusses simple frequency-domain induction motor modeling techniques suitable for conventional and harmonic power flow analysis, including an optimally fitted fundamental frequency ZIP model, several harmonic impedance scaling methods, and a temperature correction procedure. The proposed models improve power flow accuracy without substantially increasing algorithm complexity.