MODELLING AND SIMULATION OF POWER GRID CONNECTED PV GENERATION SYSTEM USING MATLAB/SIMULINK

Abstract

These days the Power Quality has become the key issue in electrical distribution power systems. Customers are critical to the energy industry's long-term growth. In this thesis comparative study of a system with a 10-kW grid- connected photovoltaic system and a PID controller with and without MPPT is simulated in Simulink. The Perturb and Observe (P&O) approach is utilised to increase the power output of a photovoltaic array. The tuned output of the PID controller is provided to the inverter through IGBT switching devices. The inverter is a three-level inverter with a Neutral Point Clamped architecture. The MPPT monitors maximum power point and provides improved output power from the photovoltaic system. The inverter's converted output is then routed to 15 kW and 20 kW local loads, respectively. The loads are switched at intervals of 0.5 seconds, and the linked power grid meets the remaining demand of the loads. Additionally, a dynamic model of a photovoltaic system is built in order to compare the output from the photovoltaic array to the inverter with and without MPPT. Also, power is compared from the inverter to the loads to confirm the usage of NPC and HCC.