Single-Phase Nine Level PWM Inverter with DC Source for Photovoltaic Systems

Nine-level inverters have tremendous applications in the power industry. They present a new set of features that are well suited for use in reactive power compensation. They typically synthesized voltage waveform reduces harmonic content. It may be easier to produce a high-power, high-voltage inverter with the multilevel structure and also voltage stresses are controlled. Increasing the number of voltage levels in the inverter without requiring higher ratings on individual devices can increase the power ratings. The unique feature of the multilevel inverters is to provide high switching frequencies with low switching losses. This paper gives an insight into PWM cascaded H-Bridge multilevel inverters. Detailed analysis of these inverters has been carried out and compared to know how the voltage stresses and switching losses reduced.