Fuzzy Controlled Multi Carrier Based Voltage Balancing Regulator for Five-Level Diode Clamped Inverter to Mitigate Switching Losses
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2015, Vol 3, Issue 10
Abstract
Multi-level inverters have drawn attention in the recent years when compared to conventional bridge converters to achieve reduced harmonics, high-voltage and high-power capability but switching loses are added on because of increased device count. Many modulation techniques were employed to reduce switching losses. This paper presents design of simple fuzzy controlled neutral point voltage [NP] regulator for five-level DCMLI using a carrier based closed-loop control technique. The regulator principle is based on adding continuous variable offset voltage which rectifies the midpoint potential of the dc bus. Aside from maintaining dc-bus voltage balance the proposed regulator leads to a significant decrement in the voltage ripple at the Neutral node point, results the minimization of the dc-bus capacitance required. It also cutbacks the switching losses of inverter by placing the “no-switching” zone in each and every half cycle of the fundamental voltage wave. The circuit is simulated in Matlab/Simulink the results obtained are compared with that of the three-level DCMLI and it is shown that the effective balancing in line voltage & reduced THD is achieved.
Authors and Affiliations
M. Nagendrababu, K. Suresh
Keywords
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