Added stair case commutation per quarter cycle are produced as shown on the diagram below,accounting for dead zone switching between positive and negative groups \text { Where } \eta=\frac{E_{1}}{E} 1.

Derive the magnitude of each ODD harmonic (bus voltage is +E). 2. Show the conditions that should satisfy the commutation angles to reject the harmonics3,5,7. Verify that the angles 17.8, 53.1 and step 0.62 give a decent solution 4. Plot (using Excel) the harmonic spectrum of the odd harmonics from 1 to 49 inclusive.Comment on the spectrum.