Modeling and simulation of 100 kWp grid-connected Photovoltaic Power System

This paper presents the modeling and simulation of a 100 kWp Photovoltaic Power System installed and operating at G. Narayanamma Institute of Technology & Science since March 2014. The utility grid-connected 100 kWp PV system comprises of PV arrays installed on the rooftop terraces of two buildings in the college connected through five 20 kW inverters to the LT distribution panels in the two buildings. The simulations are carried out for 20 KW PV system using mathematical models for PV arrays and two Maximum Power Point Tracking (MPPT) algorithms for capturing the maximum possible power under varying solar irradiance conditions on MATLAB/Simulink platform. The two MPPT algorithms used viz. (1) Perturb and Observe (P&O) and (2) Incremental Conductance (IncCond) algorithms are incorporated in the control strategies employed in the DC-DC boost converter connected between the PV array and the inverter. The simulation results of output power for varying solar irradiance conditions have been compared with actual power measurements made at corresponding irradiances.