TOPOLOGICAL ISSUES IN SINGLE-PHASE POWER FACTOR CORRECTION Vlad Grigore

TOPOLOGICAL ISSUES IN SINGLE-PHASE
POWER FACTOR CORRECTION
Vlad Grigore
Dissertation for the degree of Doctor of Science in Technology to be presented with
due permission for public examination and debate in Auditorium S4 at Helsinki
University of Technology (Espoo, Finland) on the 30th of November, 2001, at 12
noon.
Helsinki
Helsinki University of Technology
Department of Electrical and Communications Engineering
The equipment connected to an electricity distribution network usually needs some kind of power
conditioning, typically rectification, which produces a nonsinusoidal line current due to the
nonlinear input characteristic. With the steadily increasing use of such equipment, line current
harmonics have become a significant problem. Their adverse effects on the power system are well
recognized. They include increased magnitudes of neutral currents in three-phase systems,
overheating in transformers and induction motors, as well as the degradation of system voltage
waveforms. Several international standards now exist, which limit the harmonic content due to line
currents of equipment connected to electricity distribution networks. As a result, there is the need
for a reduction in line current harmonics, or Power Factor Correction - PFC.

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