Eliminating the specific harmonics especially low-order harmonics of the output voltage of 9-level inverter using SHE-PWM\r\ncontrol scheme is investigated.Harmonic minimization is the intricate optimization problems because the nonlinear transcendental\r\nequations have multiple local optima. Increasing the degrees of freedom in the suggested method means that the number of\r\nswitching angles increases. The suggested method is able to eliminate high number of undesired harmonics. As the number of\r\nswitching angles increases, using either traditional iterative techniques or resultant theory method gets useless. In this paper to\r\novercome this problem the imperialist competitive algorithm (ICA) is used. Also a DC-DC converter is used to enhance the SHE\r\nperformance in the range for which the conventional SHE methods do not have any solution. Experimental and simulation results\r\nof a 9-level inverter show that the proposed method effectively minimizes a large number of particular harmonics so the total\r\nharmonics distortion of output voltage will be lower.
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