Validation of multi-machine and single-machine equivalent models for wind farm transient stability studies

Abstract

Stability study of power system with wind farm is challenging task due to collection of system data, computation burden in case of system order and long simulation time. An aggregated representation of fixed speed wind turbine generator (WTG) is proposed for an actual wind farm which is a part of the Indian utility system. The stability study of actual system and equivalent system are simulated in MATLAB software package. Multi-machine and single-machine equivalent wind farm models are developed based on simple aggregation technique. The transient stability responses of these two equivalent wind farm models that are compared with actual wind farm system at point of common coupling (PCC). The two equivalent wind farm models response provides a satisfactory accuracy with actual system response for the three phase fault and varying wind speed. Also equivalent wind farm model responses are validated with actual system response for different dynamic conditions.