Harmonic Reduction in Cascaded Multilevel Inverter
Arvind Yadav1, Jagdish Kumar2
1Mr. Arvind Yadav, ME Scholar, Department of Electrical Engineering, PEC University Of Technology, Chandigarh, India.
2Dr. Jagdish Kumar, Associate Professor, Department of Electrical Engineering, PEC University of Technology, Chandigarh, India.
Manuscript received on 21 May 2013 | Revised Manuscript received on 28 May 2013 | Manuscript published on 30 May 2013 | PP: 147-149 | Volume-2 Issue-2, May 2013 | Retrieval Number: B0632052213/2013©BEIESP
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Abstract: This paper presents method of selecting switching angles of a cascaded multilevel inverter so as to produce required fundamental voltage along with improved staircase waveform in terms of harmonics. Cascaded multilevel inverter uses number of DC sources, for k sources number of levels will be 2k+1 and leads to k number of non-linear equations to be solved. Many approaches can be made regarding the solution but this paper focuses on Specific Harmonic Elimination (SHE) technique for angle optimization. Newton-Raphson method is used and the difficulty with this method is a closed initial guess. Variation of angles with modulation index is observed and THD is calculated for selected modulation indexes and all attempts are made so as to get lowest THD. Results are simulated in MATLAB/Simulink environment
Keywords: Cascaded Multilevel Inverter, SHE, Switching Angles, THD.
Scope of the Article: Routing, Switching and Addressing Techniques