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Comparative Evaluation of Various Passive Filter Types Regarding Their Contribution to Transformer's Loading Capacity in Non-Sinusoidal Conditions
This study aims to comparatively evaluate the widely known six passive harmonic filters as single-tuned (STF), double-tuned (DTF), triple-tuned (TTF), damped double-tuned (DDTF), third-order high-pass (TOHPF) and C-type (CTF) filters by regarding their contribution on the loading capacity of the transformers under non-sinsuoidal conditions. For the comparative evaluation, the studied filter types are optimally designed to minimize the harmonic loss factor (FHL) index, which is defined as a tool to determine the transformer’s permissible loading capacity under non-sinusoidal current conditions in IEEE C.57.110 standard. According to the harmonic distortion limitations and the reactive power compensation level recommended in IEEE 519 standard, the individual and total harmonic distortions of voltage and current at point of common coupling (PCC) and displacement power factor are considered as constraints of the studied optimal filter design problems. The simulation results obtained for the typical industrial power system show that the studied filters can be sorted as TTF, DDTF, TOHPF, DTF, CTF and STF with respect to their contribution on the transformer’s loading capacity. In addition, it is observed that the kind of the filter can considerably affect the contribution value on the transformer’s loading capacity.