Harmonic circulation method with single-phase distributed generation units in three-phase three-wire power distribution systems

In recent years, distributed generation (DG) units with a harmonic compensation function have attracted considerable attention as a solution for harmonic current suppression in low-power single-phase applications. This paper presents a harmonic circulation method for harmonic current suppression with single-phase DG units in three-phase three-wire systems. Using the proposed control strategy, all harmonic currents in three-phase grids can be removed without the installation of DG units at all harmonic sources. Furthermore, the proposed method requires less power for harmonic current suppression than the conventional method. Experimental results are presented to verify the validity of the proposed method.