SSR Stable Wind Speed Range Analysis for Hybrid Wind Farms Through Two-variable Admittance Modeling

It is urgent to ensure small signal stable operation of wind farm under variable wind speed conditions. However, the sub-synchronous resonant (SSR) stable wind speed range varies with the ratio of Type-III and Type-IV wind turbines in the hybrid wind farm grid-connected system (HWF-GCS) with series compensation lines. Firstly, the wind speed-frequency two-variable equivalent admittance model is established. Then, the influence of the ratio of Type-III and Type-IV wind turbines on the SSR stable wind speed range is analyzed by means of the amplitude phase contours plot criterion. The results show that the less the Type-III wind turbines in the HWF, the larger the stable wind speed range and the higher the stability margin, which can provide reference for the stability design in full wind speed range of actual hybrid wind farms. Simulation plat based on Matlab/Simulink is built to verify the correctness of the model and analysis results.