Orthogonal Matching Pursuit-Based Harmonic Source Localization Technology for Unobservable Distribution Networks

The traditional harmonic state estimation methods are unable to cope with the unappreciable harmonic states caused by the insufficient grid measurement configuration in practical applications, and thus have greater limitations in the application of the unknown harmonic source localisation problem. To address this situation, the paper proposes an unknown harmonic source localisation technique based on orthogonal matching pursuit (OMP) for unobservable systems. Firstly, the harmonic injection currents of sparse signal buses with low attenuation speed are selected as state variables to reconstruct the traditional harmonic state estimation equations; secondly, the OMP algorithm is proposed to achieve the accurate localisation of unknown harmonic sources and the precise calculation of harmonic currents. Finally, the simulation proves that the proposed method has high positioning accuracy, computational precision and operation speed in the multiharmonic source positioning work.