A Novel Control Strategy For Modified SL-QZSI With Three Phase AC Grid Connected System

This paper proposes the Modified Switched Inductor Quasi Z Source Inverter (MSL-QZSI) for extracting maximum solar power generation. The Z source inverter uses LC impedance network to couple the main converter circuit to the power source, which provides the boosting of input voltage. It is not possible in traditional voltage-source inverter (VSI) and current-source inverter (CSI). The proposed dynamic model of Single diode Photovoltaic Array was found to be better and accurate irradiance and temperature variation. The current source based Modified SL – QZSI has been presented suitable for photovoltaic (PV) application mainly because of its single-stage boost capability and improved reliability. These proposed inverters possess high boost voltage inversion ability and a lower voltage stress across the active switching device which compared with a conventional switched-inductor ZSI, the proposed MSL-qZSIs for the same input and output voltage used to provide continuous input current and reduced voltage stress on the capacitors. A novel control strategy of reference current generation has been analyzed under PQ theory for AC grid connected system. The design of grid-connected inverter with LCL filter was proposed for improvement of system efficiency and power supply quality of the output and also, it is often used to interconnect an inverter with utility grid; In order to filter the harmonics produced by the inverter. In addition, the performance of proposed topology is verified by using MATLAB/Simulink environment.