Cascade inverters have been widely an applied for the covering of high voltage and high power systems. The input power sources for an inverters needs separate DC voltage sources, if the fluctuations occur at the input voltage, The traditional method are difficult to implement conducting angels of switches to minimize the harmonic distortion of output voltage on a single chip, A switching control algorithm is proposed and validated for multilevel inverter with fluctuating DC voltage sources. In this paper simple control algorithm will proposed for multilevel inverter with variable DC voltage sources, we considered as a DC voltage ripples 10%, 15% and 20% for 27-level & 31-level inverter and the total harmonic distortion has Analyzed, the Simulations results are presented to the superiority of the proposed system.
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