Voltage harmonics reduction in single phase 9-level transistor clamped H-bridge inverter using nearest level control method

Nurul Ain Mohd Said (Universiti Teknikal Malaysia Melaka)
Wail Ali Ali Saleh (Universiti Teknikal Malaysia Melaka)
Wahidah Abd Halim (Universiti Teknikal Malaysia Melaka)

Indonesian Journal of Electrical Engineering and Computer Science
Vol 20, No 3: December 2020

This paper proposes a nearest level control method based modulation scheme for a 9-level symmetrical Transistor Clamped H-bridge (TCHB) inverter. The topology has gained increasing research focus due to its advantages in obtaining high quality output while using a reduced number of electronic components. The device count for obtaining a 9-level output voltage is it uses 10 active switches as compared to the 16 being used in a conventional 9-level cascaded H-Bridge (CHB) inverter. The significant contribution of the research is the development of the NLC modulation technique that operates at the fundamental frequency, thus reducing switching losses, and able to reduce harmonic content significantly. The reduced harmonic content can lessen the power quality problem. The NLC modulation scheme, shows that the overall THD is reduced without the need for filtration. The 50 values of harmonic content will be count that follows the IEEE Standard 519. MATLAB/Simulink based simulations and experimental results obtained from the laboratory prototype of a single-phase TCHB inverter feeding a R load validate the theoretical analyses and effectiveness of the proposed modulation scheme.