A New SVPWM Modulated Input Switched Multilevel Converter for Grid-Connected PV Energy Generation Systems

Abstract

Solar energy is becoming more important since it produces less pollution and the cost of fossil fuel energy is rising, while the cost of solar arrays is decreasing. The proposed solar power generation system generates a sinusoidal output current that is in phase with the utility voltage and is fed into the utility. An inverter is necessary in the power conversion interface to convert the dc power to ac power. The output voltage of a solar cell array is low, a dc–dc power converter is used to boost the output voltage and match the dc bus voltage of the inverter. In this proposed inverter have eight switches and their switches operate with fundamental frequency. A new solar power generation system, which is composed of a dc/dc power converter and a new seven- level inverter, produced seven level output voltage. The proposed inverter reduced the switching losses, complexity, size and cost. This new seven-level inverter is configured using a capacitor selection circuit and a full-bridge converter. The capacitor selection circuit converts the two output voltage sources of dc–dc converter into a three-level dc voltage, and the full-bridge converter further converts three-level dc voltage into a seven-level ac voltage. The PWM signals are generated by using fuzzy logic controllers. The performance of this proposed solar power generation system by using MAT Lab/Simulink.