Enhancement of Power Quality for 15 Level Inverter using Phase Disposition-PWM Technique
Richa Gupta*, Research Scholar, Electrical Engineering Department, SGSITS, Indore(M.P.), India.
Manuscript received on December 01, 2020. | Revised Manuscript received on December 18, 2020 | Manuscript published on December 30, 2020 | PP: 1-6 | Volume-6, Issue-12, December 2020. | Retrieval Number: 100.1/ijisme.L12701261220 | DOI: 10.35940/ijisme.L1270.1261220
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: With consideration of use of solar, wind and other renewable energy source for industrial applications like electric vehicle drive, train traction and FACTS integration, which demand voltage levels in the range of kilo volts with high power quality, to achieve this high voltage level and high quality of power, a cascaded H-bridge multilevel inverter based topology capable of operating with low harmonic distortion is proposed in the paper. In order to attain low total harmonic distortion (THD), use of phase disposition-PWM technique is proposed in the paper. Giving due attention to both switch count and low THD, the output voltage levels of the multi-level inverter are set at 15 levels. Due to half wave symmetry the even order harmonics for proposed system become zero and the lower order harmonics reduces which is shown in tabular from. Due to reduced switch count and low THD the overall system become more efficient and effective. The effectiveness of the proposed control strategy has been verified using MATLAB simulations. Simulation is done for both symmetrical as well as asymmetrical multilevel inverter topology. It is observed that quality of the output voltage waveforms of the multi-level inverter (MLI) is as per the IEEE std 519 specifications. For symmetrical reduced switch fifteen level inverter the THD is 4.42% and for asymmetrical topology THD is 4.59% for the output voltage waveform.
Keywords: Multi-level inverter (MLI), Total harmonic distortion (THD), Pulse width modulation (PWM), Phase Disposition (PD).D).