Stability of the micro-grid with wind power generation

This paper examines stability performances of a micro-grid application under both small and large disturbances, including islanding mode of operation. The system modeled encompasses dynamics and control of the doubly-fed induction generator, wind turbine, synchronous generator, and constant-power load. Fluctuation of wind speed is modeled using Weibull distribution. Simulated test results reveal that the micro-grid operates quite stably under normal operation where the mechanical and power electronic controllers embedded for wind power generation provide sufficient control requirements. Nevertheless, some additional frequency control such as governor action could be necessary under disturbance operation which brings about the stand-alone mode to maintain system frequency deviation within an acceptable range. Last, the need of local capacitor for voltage support when using conventional squirrel cage induction generator has been demonstrated.