నైరూప్య

Power Quality Improvement of DC-AC Converter by Using Cascaded H-Bridge Multilevel Inverter

B.Harish, U.Raja Kiran, B.Madan lal, Soubhagya Kumar Dash

Power quality place a major role in power systems. The electronic equipments lead to harmonics in power lines. The two level inverter has more harmonic content and it can be reduced by using filters which are bulky in size and costlier. Multi level inverter (MLI) reduces the harmonic content and achieves nearly sinusoidal wave. It also reduces stress on the switches and increases the power rating of system. The cascaded H-bridge (CHB) inverters are modular type of inverters and can integrate the renewable energy resources like solar, fuel cell, wind energy etc., to the grid with elimination of transformer. In this paper different control strategies (carrier based pulse width modulation) for generating pulses to the inverter are discussed for various levels with its applications. The CHB inverter for various levels (up to 13 levels) has been simulated by using MATLAB/SIMULINK and its results are discussed.