Investigation into the estimation of the critical clearing time of a grid connected wind power based embedded generator

Transient stability assessment of a wind power based embedded generator (WPBEG) play an important role in power system security and operation. The transient stability of a WPBEG measures its robustness to withstand large disturbance and is determined by its corresponding critical clearing time (CCT). Conventionally, determination of a wind farm´s CCT involved a large number of trials and error that requires repetitive runs of related time-domain simulation programs. As the value of the CCT of a WPBEG is affected by system parameters, the process of the trials and error has to be repeated every time system condition changes if the CCT is required to be determined. This approach is tedious and time consuming. The work that reported in this paper described an attempt to solve the CCT estimation problem using nonconventional approach that avoids running related simulation program several times. A detailed description of the proposed method, its implementation and its validity are discussed. Results from a simulated distribution network with integrated WPBEG are also presented and discussed.