A Novel Cascaded Multilevel Inverter for High Power UPS Application

Senthilkumar, R.; Jerome, Jovitha
September 2011
European Journal of Scientific Research;9/21/2011, Vol. 60 Issue 2, p207
Academic Journal
This paper presents a novel cascaded multilevel inverter topology for high power Uninterruptible Power Supply (UPS) systems. Traditional systems consists of PWM inverters with high switching frequency which leads to increased switching stress and low value of voltage gain. Cascaded Multilevel Inverters (CMLI) have higher voltage gain, less switching stress and low Total Harmonic Distortion (THD) and more efficient and suitable for utility applications due to its improved harmonic profile and increased power ratings. It also requires fewer switching devices for producing the same number of voltage levels thus reducing the control circuit and cost. The proposed scheme offers less weighted THD and higher output voltage levels. The proposed inverter is modelled using PSIM and various parameters like THD, power quality, dynamic response and efficiency are analysed. A prototype experimental setup of a 1KVA CMLI is developed to validate the simulation results.


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