To explore the self-excitation risks in weak interconnection power grid from the wind power flow, a vector control model of variable speed wind turbine based on doubly fed induction generator (DFIG) is established using electromagnetic transient simulation software PSCAD/ EMTDC. Start from the basic circuit model, the self-excitation phenomenon is analyzed with wind power integration. Simulation results show that the effect of wind power integration on the self-excitation risk is mainly determined by DFIG’s operation method, and wind power integration will affect self-excitation engineering judgment method at the same time. When DFIG works in phase late operation or has no reactive power exchange with the main power grid, cutting the wind turbine after broken thread quickly can restrain the worsening trend to a certain extent. However cutting the wind turbine after broken thread when DFIG works in phase advance operation may cause a voltage jump of the hydraulic synchronous generator in parallel with the wind turbine.

Wind energy is becoming gradually more important as a power production source in distributed generation. In the present study, based upon the mesoscale wind data in the year of 2016, a microscale wind resource analysis of Huairou district with a resolution of 500 × 500 m was developed by applying computational fluid dynamics method. Wind speed and wind power density were simulated and analyzed at the height of 50, 80 and 100 m over the whole district. The obtained results revealed that wind resource is relatively abundant in some central mountain regions of Huairou, while other regions have poor reserves. It was also concluded that the wind potential in those mountain areas is suitable for constructing a distributed wind farm with an install capacity of 30 MW by applying low speed wind turbine groups.