1) Series connected, parallel tuned passive filters that blocks flow of harmonic currents
2) Shunt connected, series tuned passive filters that bypass them
3) Combination passive filters using both series and shunt filters
4) Active Power Filters using PWM IGBT converters which compensate harmonics
5) Hybrid filters using a combination of passive and Active filters
What are the existing methods for non-sinusoidal and non-linear current compensation? - ResearchGate. Available from: https://www.researchgate.net/post/What_are_the_existing_methods_for_non-sinusoidal_and_non-linear_current_compensation [accessed Dec 5, 2016].