ABSTRACT
This entry presents an overview of the main characteristics of renewable energy resources and defines the main operational and interconnection challenges associated with grid-connected renewable energy sources. The entry focuses on the transient performance of wind energy systems as affected by the technological advances of these systems. Modeling of major wind energy conversion systems (WECSs) for transient analysis is presented; both squirrel cage induction generator (SCIG)-based fixed-speed wind turbine (FSWT) and doubly fed induction generator (DFIG)-based variable-speed wind turbine (VSWT) systems are considered in detail. The modeling, transient response analysis, and suggestions for improving the transient response through either internal or external changes in either the system parameters or system structure are presented. A parametric analysis of the impact of changes in various electrical and mechanical parameters on the transient performance of the considered WECS is presented. The fault ride-through (FRT) capability requirements as demanded by various international grid codes are summarized. In addition, the consistency of the considered WECSs with the FRT capability required by the E.ON Netz grid code is also analyzed. This entry aims to specify the system parameters and changes that are needed for improvement in the system stability. Therefore, the results are beneficial for the design, planning, and operation of wind power systems. In addition, the quantitative comparison between various WECS and their consistency with the FRT requirements plays a key role in wind power planning.
