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Non-Carrier based Digital Switching Angle Method for 81-level Trinary Cascaded Hybrid Multi-level Inverter using VHDL Coding

Joseph Anthony Prathap, Dr.T.S.Anandhi

In this paper, non-carrier based digital switching functions and patterns are developed using VHDL language (DSFPV).Non-Carrier based switching angle method is selected for the reduced distortion characteristics. Different methods of switching angle methods like equal phase method, half equal phase method, half height method and feed forward method are designed and developed using VHDL coding. These generated digital switching pulses are validated by interfacing with the 81-level Trinary Cascaded Hybrid Multi-Level Inverter (TCHMLI) simulink model. The obtained simulation results are analysed by the measure of Total Harmonic Distortion (THD), Peak Voltage (Vpeak), Root Mean Square Voltage (Vrms), Average Voltage (Vavg), Form Factor(FF) and Crest Factor(CF).