Technical solutions for harmonic resonance at MV: Relocatable capacitor bank technique

Capacitor banks are installed to compensate the reactive energy demanded by the local loads or feeder reactance, in order to adequate the voltage and technical losses. Although those benefits of installing capacitor banks in feeders are incontestable, the engineers should consider the harmonic resonance effects and the possibility of this resonance to increase the voltage distortion to levels above of the acceptable limits. In fact, the problems related to harmonics are spreading on MV systems due to the increasing quantity of disturbing loads. This work presents one case under survey at CPFL Paulista, where a feeder supplies several non-linear loads in two plants and three automatic capacitor banks.