Series and Shunt Compensators Effects on Harmonic Resonant Frequencies Excursions

Harmonic resonances may damage equipments and interrupt electric power customers services. Shutdowns may affect seriously harmonic resonant frequencies and may initiate new resonances in power systems. Series and shunt capacitors are used as compensators to improve system operational conditions. Controlled static Var compensators are also used for the same purposes. Influences of these devices on harmonic resonance conditions in presence of other harmonic sources are studied in this paper. New harmonic resonances are detected in presence of those devices. Evaluation of the excursions of harmonic orders leading to harmonic resonances are performed in presence of variable series or shunt capacitor capacitances and static Var compensators. Influence of system resonances on resonant frequencies are studied in all those cases.