Risk based probabilistic security evaluation algorithm of bulk power system

In this paper a more accurate probabilistic security evaluation algorithm for bulk power system based on analytical approach is proposed. Not only the single or double failure of line or transformer but also the multiple failures caused by protection failure to operate or rejection can be modeled to get the probabilistic security indices. Node and system risk indices are also calculated. New probabilistic security evaluation software named PSD-PRE which achieves the calling of PSD-BPA is developed using Visual FORTRAN and Visual C++. Accelerating algorithm is adopted to alleviate the calculation burden of PSD- PRE. PSD-PRE has been tested using Macao electric power network. The simulation results show that PSD-PRE is valid and available and indices can be used as the basis of transmission network planning.