  This paper presents a comparative analysis of several modelling approaches of
key elements used in simulations of power systems with renewable energy
sources. Different models of synchronous generators, transmission lines,
converters, wind generators and photovoltaic (PV) power plants are compared to
assess the most suitable models for grid-connection studies. It also analyses
how the dynamics of PV power plants and the mechanical dynamics of wind
generators affect the electrical variables on the grid side. The models were
compared in terms of precision and computational time through simulations of
load connection, short-circuits, disconnection of generators and lines in a
benchmark system modelled in Simulink.
