The paper presents a system-wide continuous harmonic state estimator of three-phase asymmetric power systems, with development of its reduced mathematical models and algorithm, as well as its application to a New Zealand test system. The complete harmonic information throughout the power system, including location and even type of the harmonic source, is estimated from a few synchronised, partial and asymmetric measurements at selected buses and lines far from the harmonic source.
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Du et al. (1996) studied this question.