TY - JOUR N2 - The paper includes a summary and a background of long-time research conducted by a research team in the Institute of Electrical Engineering and Computer Science at SilesianUniversity of Technology. The researchwork has principally been related to selected problems in the field of analysis and synthesis of systems aimed at symmetrisation and improvement of some power quality parameters. This paper constitutes a first part of the report on the research. It has been devoted to effective elimination of higher harmonics and reactive power compensation by means of parallel active power filters. The other problem discussed in this paper is related to this issue and it is very important from the economic point of view; it addresses optimal sizing and placement of active power filters in investigated power networks. L1 - http://www.journals.pan.pl/Content/107876/PDF/AEE-67-3-2018-10.09_art_9.pdf L2 - http://www.journals.pan.pl/Content/107876 PY - 2018 IS - No 3 EP - 591–602 DO - 10.24425/123665 KW - active power filters KW - APF KW - compensation of higher harmonics KW - optimal APF sizing and placement KW - power quality A1 - Pasko, Marian A1 - Buła, Dawid A1 - Dębowski, Krzysztof A1 - Grabowski, Dariusz A1 - Maciążek, Marcin PB - Polish Academy of Sciences VL - vol. 67 DA - 2018.09.13 T1 - Selected methods for improving operating conditions of three-phase systems working in the presence of current and voltage deformation – part I SP - 591–602 UR - http://www.journals.pan.pl/dlibra/publication/edition/107876 T2 - Archives of Electrical Engineering ER -