Modelling for Integration in Electricity Grids with Advanced Grid Code Requirements and Study the Viability of DC-DC BESS of a Solar PV Power Plant

Abstract

This Master Thesis focuses on solar PV (Photovoltaic) plant integration in electrical power systems and the problem of power variability from a solar PV power plant. It presents an analysis to test the grid interconnectivity of Gamesa Solar PV inverter model by performing load flow, short circuit and dynamic stability studies. It evaluates the compliance of the PV inverter for Mexican Grid Code requirements of LVRT/HVRT (Low Voltage Ride Through/ High Voltage Ride Through), frequency response and active power regulation. To accommodate the effect of spatial and temporal diversification on the measured irradiance data from a single sensor, different methodologies are compared, with WVM (Wavelet Variability Model) methodology being selected for further analysis. It studies the power ramping issue in a solar PV plant and evaluates the feasibility of DC coupled BESS (Direct Current Coupled Battery Energy Storage System) to minimize the power ramp-down problem. It also determines the economic viability and best design size for this DC coupled BESS