Power system reliability improvement by using Active and Passive Harmonic filters

The steady increase in non-linear loads on the power supply network such as, AC variable speed drives, DC variable Speed drives, UPS, Inverter and SMPS raises issues about power quality and reliability. In this subject, attention has been focused on harmonics . Harmonics overload the power system network and cause reliability problems on equipment and system and also waste energy. Passive and active harmonic filters are used to mitigate harmonic problems. The use of both active and passive filter is justified to mitigate the harmonics. The difficulty for practicing engineers is to select and deploy correct harmonic filters , This paper explains which solutions are suitable when it comes to choosing active and passive harmonic filters and also explains the mistakes need to be avoided.