A parallel algorithm of transient simulation for distributed generation system based on multi-core CPU

The dynamics of a microgrid is greatly complex due to the diversity of distributed generation (DG) and the high nonlinearity within the system itself. Transient simulation tool plays a significant role in obtaining a full and detailed response under various operation conditions. However, the simulation capability and speed become limited with increased system size. This paper presented a parallel algorithm for microgrid transient simulation. The algorithm first decoupled the solution of the electrical and control systems using a one time-step delay. Then, an improvement algorithm on the interface accuracy and numerical stability was proposed using explicit integration or formulas. Finally, the control system was further decoupled according to its topology. The algorithms can be easily realized, and the computation loads are balanced by DG modeling. The effectiveness of the proposed algorithms is validated in a benchmark low-voltage microgrid.