HARMONIC BLOCKING COMPENSATOR - FREQUENCY PROPERTIES

Resonant harmonic filters (RHF) commonly used for reducing waveform di stortion in distribution systems have a number of disadvantages. Their effectiveness degrades with an increase in the distortion of the dist ribution voltage. The current hat-monies other than those to which the filter is tuned can be amplified. Filter performance is very sensitiv e, usually, to reconfigurations in the distribution system. Active har monic filters ape alternative for RHF: They have high complexity, howe ver, and their dissemination in distribution systems seems to be rathe r slow. This paper investigates another alternative for RHF, namely a harmonic blocking compensator (HBC) built of a shunt capacitor and a s eries resonant link tuned to the fundamental frequency. This paper com pares properties of RHF and HBC, provides fundamentals for the design of HBC and illustrates the ir properties with results obtained with a laboratory prototype.