HARMONIC ELIMINATION IN MULTILEVEL INVERTERS USING CUCKOOS SEARCH ALGORITHM

A new approach for minimization of total harmonic distortion (THD) of a multilevel flying capacitor inverter (MFCI) based on the selective harmonic elimination named stochastic THD (STHD) strategy is proposed. In the STHD strategy, the step voltage levels of multilevel inverter are considered to be varying due to unbalanced capacitor voltages. This paper improves modeling of harmonic elimination In the proposed strategy, the switching angle variations and unbalancing of flying capacitor voltages are evaluated by formulation of 2m+1 is combined with new modified cuckoo search algorithm and a self-adaptive mutation tactic for the establishment of new robust algorithm for minimization of the THD and the best switching angles pattern in low switching frequency without measuring current and capacitor voltages.