DESIGN AND IMPLEMENTATION OF CONTROLLER FOR NEXT GENERATION GRID-TIED, SINGLE PHASE PV INVERTER

Abstract

Due to rapid decline of the fossil fuels in the recent past years, renewable energy is on the bloom. Among renewable energy, Solar energy is gaining popularity in the market due to its both small scale and large scale applications. Solar energy produced on small scale can be used for local applications which in turn reduces the load on the grid. Solar energy when produced on massive scale can be supplied back to the grid. But the integration of the DC output power available from the Solar Photovoltaic System still remains a problem. This thesis focuses on developing a simple, next generation, controller for the single phase grid tied inverter which not only controls the active power but also the reactive power. Objective of this thesis is to develop a new control method for the single phase half bridge inverter using rotating frame analysis to obtain superior dynamic response and system performance. PV inverter front end requirements are studied. A DC voltage source with variable magnitude and non zero source impedance is used to examine the inverter performance. DC link capacitors requirement is established and optimum capacitance value is determined. Inverter controller performance is monitored under fluctuated dc link voltage. MATLAB software is used for the simulation of the model of the controller developed in the process.