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Analysis of PWM Strategies for a Single-Phase Multilevel Inverter with Reduced Number of Switches for PV Application

P.Vaishnavi, Dr.R.Seyezhai

This paper presents a new power converter topology which consists of DC/DC power converter and a seven level inverter with reduced number of switches for PV applications. The DC/DC power converter converts the dc voltage into two independent voltage sources and the seven-level inverter consist of capacitor selection circuit along with full bridge converter .The output of the DC/DC power converter is converted into three level dc voltage by using capacitor selection circuit and further full bridge converter converts the three level dc voltage into seven- level ac voltage. This proposed topology has been implemented with six switches compared with Conventional Multilevel Inverter (CMLI). This paper proposes single and dual carrier modulation strategies to improve the spectral quality of the output. Simulation studies are carried out in MATLAB/SIMULINK and the performance parameters of the proposed inverter are computed. The results are verified.