A Fully Parallel Nested BBDF Method for Power System Transient Stability Simulations

A fully parallel nested bordered block diagonal form (BBDF) method for power system transient stability simulations is proposed in this paper. The fully parallel nested BBDF (FNBBDF) method is developed by combining the fully parallel BBDF method with the nested BBDF method based on subnet-core mapping and mixed programming of MPI and OpenMP. The FNBBDF method is compared with existing methods from the perspectives of computational burden, parallel overhead, and subnet-core mapping. Detailed tests of the FNBBDF method are carried out in the 2383wp system and two practical power systems (13490-node and 24886-node). The test results prove the efficiency of the proposed method. The FNBBDF method can increase the speedup ratio to more than 21x with 64 CPU cores in the 24886-node test power system.