The implementation of SHE control technique for the SST with CHB seven-level waveform on the solar farm applications

Abstract

This proposed paper presents the use of selective harmonic elimination (SHE) technology to control the cascaded H-Bridge Multi-level Inverter (CHBMI) for power transferring over the high frequency transformer (HFT), which is a part of the SST for applying to a solar farm. Apparently, the converter is using the seven-level CHBMI and the SHE technique to get rid of the 5th harmonic and 7th harmonic to find a set of angles θ1, θ2 and 63 with the lowest 3rd harmonic. The calculated angles are used in each modules. Obviously, the simulation has shown that, at ma=2.43, θ1=11.6782°, θ2=26.8870° and θ3=56.0271°. The total harmonic distortion (% THDv) will be lowest at 9.35%. According to the experimentation, the SHE technique with low % THDv can reduce the power loss at HFT compared to the square wave transmission technique which the % THDv is high.