On the stability of three-phase grid-tied photovoltaic inverter systems : modeling, investigation, and stability-enhanced operation; 1. Auflage

Environmental concerns with greenhouse gas emissions and liberalized electricity markets have been driving the proliferation of renewable energy generations. With increasing penetrations of photovoltaic (PV) and wind generations, the conventional power grids dominated by large machines are evolving towards purely power-electronic-based generator systems. However, interactions among power electronic converters, loads, and the grid bring new challenges to the stability of converter-based power systems. This work investigates the harmonic stability issue of three-phase grid-tied PV inverter systems, aiming to provide a comprehensive framework to model and study the complete system dynamics and to identify the reason of resonances. Control strategies are prosed to enhance the stability for converter-based power systems.