An Approach in Selective Harmonic Mitigation Technique for Reduction of Multiple Harmonics with Only Two Switchings Per Quarter

The selective harmonic elimination technique allows us to eliminate completely N number of harmonics with (N+1) number of switchings per quarter. However, instead of completely removing grid regulations demand that harmonics be kept to less than 5%. Therefore, there exists a possibility of bringing more harmonics within the 5% band while keeping the number of switchings fixed. This degree of freedom is explored in this paper wherein many harmonics are mitigated while keeping only two switchings per quarter. The analysis is tested in simulation for various operating conditions using MATLAB/Simulink software. It is shown that up to 17
^th
harmonic can be mitigated to less than 5% with two switchings per quarter.