Multicarrier PWM Strategies for Hybrid Symmetrical Multilevel Inverter with Reduced Switch Count
Ujwala Gajula1, Gouthami Eragamreddy2

1Ujwala Gajula*, Assistant Professor, EEE Department, G.N.I.T.S, India.
2Gouthami Eragamreddy , Assistant Professor, EEE Department, G.N.I.T.S, India. 

Manuscript received on June 01, 2020. | Revised Manuscript received on June 08, 2020. | Manuscript published on June 30, 2020. | PP: 860-866 | Volume-9 Issue-5, June 2020. | Retrieval Number: E9792069520/2020©BEIESP | DOI: 10.35940/ijeat.E9792.069520
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Abstract: Multilevel inverters are widely used for high power and high voltage applications. The performance of multilevel inverters are superior to conventional two level inverters in terms of reduced total harmonic distortion, higher dc link voltages, lower electromagnetic interference and increased quality in the output voltage waveform. This paper presents a single phase hybrid eleven level multilevel inverter topology with reduced switch count to compensate the above mentioned disadvantages. This paper also presents various high switching frequency based multi carrier pulse width modulation strategies such as Phase Disposition PWM Strategy (PDPWM), Phase Opposition and Disposition PWM Strategy (PODPWM), Alternate Phase opposition Disposition PWM (APODPWM), Carrier Overlapping PWM (COPWM), Variable frequency carrier PWM (VFPWM), Third Harmonic Injection PWM (TFIPWM) applied to the proposed eleven level multilevel inverter and is analyzed for RL load. FFT analysis is carried out and total harmonic distortion, fundamental output voltage are calculated. Simulation is carried out in MATLAB/SMULINK. 
Keywords: Multi Carrier Pulse Width Modulation, Total Harmonic Distortion, Hybrid Multilevel Inverter, High Switching Frequency PWM.