To improve the computational speed of electromechanical -electromagnetic transient simulation program of power system, based on Power System Model (PSD-PS Model) hybrid simulation program, the electromechanical -electromagnetic transient simulation interface algorithm was studied in depth. Combined with the common method of electromagnetic simulation parallel computing, according to the hybrid simulation multi-thread parallel computing method based on electromechanical transient side solution

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... twork, the multithread parallel algorithm of PSD-PS Model hybrid simulation electromagnetic transient subroutine was realized with multithread program. The results showed that when there were 7 direct current (DC) lines on the electromagnetic side, the time of serial calculation was 2740.004 s, and the time of single-thread parallel calculation was 1175.337 s. And the speed advantage of multi-thread parallel computing was more obvious than that of serial computing, and with the increase of DC system in the electromagnetic transient subsystem, the speed advantage was more prominent. In addition, when there were 7 DC lines in the electromagnetic transient subsystem, the time of multi-thread parallel computation was only 320.066 s. Accordingly, it can be concluded that this algorithm can greatly improve the utilization rate of processor and the speed of simulation calculation and it is very practical in engineering.