Low voltage ride through characterization of wind energy conversion systems

Abstract

Low Voltage Ride Through (LVRT) has emerged as an essential requirement that system operators demand to wind energy conversion systems (WECS). LVRT characterization is to get the minimum grid voltage profile under which the transient stability of WECS is not possible. This paper will determine the LVRT capability of existing Egyptian WECS. The methodology for analyzing wind power systems will require the modeling of three different wind turbine generator technologies. These are the fixed speed induction generator (SCIG), variable slip IG with variable rotor resistance, and doubly-fed IG with rotor-side converter. The methodology also requires the modeling of wind power plant, and the equivalent representation of power system. Simulation results are obtained for different IG technologies. They will provide a good understanding of the dynamic behavior of existing wind farms, and how to improve the stability and LVRT capability. Moreover, the results will form a template for the requirements by wind farm developers and power utilities in Egypt when developing new wind farms.