Zero-sequence harmonics current minimization using zero-blocking transformer and shunt LC passive filters

This paper presents a method for zero-sequence harmonics current minimization using zero-sequence blocking transformer and passive filters. The zero-sequence blocking transformer placed in series with the source provides high zero-sequence impedance while the shunt-passive filters placed parallel with the load provides low zero-sequence impedance. Thus, the zero-sequence harmonics currents tend to flow through the filter instead, of the source. The effectiveness of this method depends on the ratio of zero-sequence blocking transformer impedance to filter impedance. This method offers relatively low-cost solution, while the passive components used make this method relatively more reliable. The analysis is confirmed by simulation. The simulation result is verified through experiment. work.