Publication:
Switching technique of harmonic elimination pulse width modulation for five-phase multilevel inverter
Switching technique of harmonic elimination pulse width modulation for five-phase multilevel inverter
Date
2021
Authors
Muhammad Sirajuddin Muhammad Azhar Walter
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Abstract
This research focuses on the switching technique of harmonic elimination pulse width modulation for five-phase multilevel inverter. Multilevel inverters are one of the most commonly used switching mechanisms. However, this switching may cause harmonics which usually occur in a power system due to distortion and can cause a lot of unwanted problems. It could appear in either voltage or current waveforms. Minimization of Total Harmonic Distortion (THD) is necessary in order to maintain a good power system. The proposed switching technique for five-phase cascaded multilevel inverter used in this research is non-notch and notch switching technique. Particle Swarm Optimization (PSO) algorithm was used as an optimization technique to find switching angles for non-notch and notch switching techniques. In addition, the simulation of a seven-level five-phase cascaded multilevel inverter for both switching operations is carried out in the PSIM environment. The results show that the non-notch switching was able to eliminate lower order harmonics up to the 7th harmonic. Next, the notch switching technique managed to eliminate lower order harmonics up to the 41st harmonic with 3/5/9 switching distribution. This verified that switching angles obtained from the PSO were evaluated. The advantage of this notch switching technique was confirmed by the simulation results, where the 3rd, 7th, 9th, 11th, 13th, 17th, 19th, 21st, 23rd,27th, 29th, 31st, 33rd, 37th, 39th, and 41st harmonics are successfully eliminated. The results were obtained for an entire modulation index of 0.50 to 0.90 for non-notch switching. While for notch switching, modulation index of 0.60 to 0.90 were provided with solutions. For this research, modulation index of 0.65 and 0.85 was chosen to be experimented. The effectiveness of a notch switching scheme in reducing THD for a system was proven. Obtain simulations results were also verified with hardware configuration. The results show that the THD for modulation index 0.65 is 5.34% and for modulation index 0.85 is 1.72%. It is envisaged that the proposed HEPWM can be very useful in the design of a practical high performance and low cost five-phase cascaded multilevel inverter.
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Keywords
Harmonic,
Inverters