Three-Phase Grid Connected SPV Inverter with Flexible Control of DC Link Voltage

Growing concerns on climatic changes and rapid depletion of fossil fuels results in immediate action to accelerate the clean energy generation using renewable energy resources. Alternative input from solar energy for daily needs is one such platform which has immense potential and is universally accessible with least environmental effects. The proposed system deals with a solar powered source connected to utility with a grid interfaced inverter using adaptive DC link technology which reduces the overall power loss in the whole system. This methodology stands over the constant DC link technology. This project operates with a three-phase grid-coupled solar photovoltaic (SPV) system which includes a two-stage operation. The first stage deals with a boost converter which accomplishes the maximum power point tracking (MPPT) using Incremental Conductance (InC) technique which is more easier and accurate. The output of the boost then feeds the DC link capacitor which is made adaptable to grid voltage variations. The second stage consists of a voltage source converter (VSC) which enact as a PV inverter and delivers the power to the grid via boost converter. The proposed strategy was designed for a 20 kW SPV system and was simulated in MATLAB Simulink 2017b.