Design and Implementation of Bipolar SHE-PWM Single Phase Inverter for Lower Order Harmonic Suppression

Power quality has gained significant importance in modern industrial systems. The modern supply systems utilize power electronic inverters as the control becomes simpler, accurate and more effective. However, it gives rise to harmonics. Therefore, some technique is needed to eliminate the dominant harmonics i.e. low order harmonics. This paper presents the design and real-time implementation of Bipolar Selective Harmonic Elimination PWM (SHE-PWM) scheme in Single Phase 2-level Inverter for Suppression of Lower Order Harmonics. In this scheme, switching angles are predetermined to eliminate specific harmonics. The switching angles are determined using `Trust-Region Dogleg' method in MATLAB. The complete solution for 2-level bipolar switching patterns to eliminate 3
^rd
, 5
^th
,7th and 9
^th
harmonics is given in detail.