Tournament Selected Glowworm Swarm Optimization Based Measurement of Selective Harmonic Elimination in Multilevel Inverter for Enhancing Output Voltage and Current

Abstract

In modern days Multi Level Inverters (MLIs) in the power industry receive a large interest. The MLIs with multilevel structures produces higher-power, higher-voltage inverters. Selective Harmonic Elimination (SHE) has become a popular one. It has been utilized widely studied during the past several decades for multilevel inverters as it has many merits like lesser switching losses and lesser Total Harmonic Distortion (THD). However, many researchers have failed to reduce the selective harmonic elimination time consumption and improve efficiency. A novel Tournament Selected Glowworm Swarm Optimization-Based Selective Harmonic Elimination (TSGWSO-SHE) approach is proposed in this paper for addressing these problems. The major aim of the TSGWSO-SHE approach is selecting optimal switching angles for removing the lower order harmonics. In the TSGWSO-SHE technique, initially, multilevel-inverters are created, and the modulation index is measured. Based on the modulation index, Switching Angles (SAs) are determined. Then several switching angles are initialized randomly. The objective function is determined for every switching angle. Using it detects and chooses the neighbouring switching angle with higher brightness by tournament selection and move to it. Lastly, the switching angle updates its position and finds the optimal switching angle. In this way, an optimal SA is selected during the process of selective harmonic eradication in MLI with higher efficiency and minimal time consumption. The efficiency of TSGWSO-SHE technique is simulated using parameters such as time of SHE, SHE efficiency and THD. Results prove that the proposed TSGWSO-SHE technique provides better SHE performance as compared to the existing studies. Experimental results demonstrate that the TSGWSO-SHE technique reduces the THD and SHE time by 46% and 33%, and the efficiency of selective harmonic elimination is increased by 13% compared to existing methods.