Modeling and Design of Level Inverter for Grid-Connected PV Fed Induction Motor Drive

Abstract

Photovoltaic power generation employs solar panels composed of a number of solar cells containing a photovoltaic material. Multilevel inverter structures have been developed to overcome shortcomings in solid-state switching device ratings so that they can be applied to high voltage electrical systems. The multilevel voltage source inverters unique structure allows them to reach high voltages with low harmonics without the use of transformers. This makes unique power electronics topologies suitable for Flexible AC Transmission Systems and custom power applications. The use of a multilevel converter to control the frequency, voltage output including phase angle, real and reactive power flow at a dc/ac interface provides significant opportunities in the control of distributed power systems. In this concept, new system architecture for 7-level MLI system is proposed. This method allows the renewable energy sources to deliver the load together or independently depending upon their availability. The proposed inverter uses less number of switches when compared with the conventional multilevel inverter. This concept can be extended to apply for induction motor drive i.e., a 3-Phase Seven Level Inverter for Grid connected PV system fed Induction Motor Drive.