Harmonic Resonance Identification and Mitigation in Power System Using Modal Analysis

Due to a rising share of power electronic devices in networks and the consequent rise harmonic distortion, impedance resonances are an important issue. Nowadays, frequency scan method is used for resonance phenomena identification analysis. The main disadvantage its inability decouple different phenomena. This means that also unable provide sufficient information about effects parameters network elements have on Furthermore, it was noted despite fact mode analysis well described literature, there lack systematic approach procedure. Thus objective this paper address propose mitigation, utilizing modal In first part paper, dominant nodes terms amplification harmonics determined. done by eigenvalues admittance matrix. Using eigenvalue results, key involved specific determined next. performed calculating critical (i.e., experiences resonance) sensitivity coefficients with respect parameters. second procedure shift presented. changing value selected parameter so matches desired value. calculated Newton–Rhapson method. Presented considers both parallel series resonances. effectiveness proposed demonstrated actual industrial-network model.