A two-level parallel transient stability algorithm for AC/DC power system based on GPU platform

The expansion and complexity of AC/DC power system in China put forward higher request on the speed and accuracy of transient stability simulation.A two-level parallel algorithm based on GPU platform for the transient stability simulation of AC/DC power system is presented.The first level is AC-DC parallel.Considering the dynamic independency of DC power system,AC/DC power system is decomposed into two parts:the computation of AC power system is deployed on CPU,and HVDC is deployed on GPU.The second parallel level focuses on HVDC.In this paper,DC system adopts detailed model for simulation under small step.Based on the principle of parallel-in-time method,the pipeline technique is implemented on GPU,which can set the numbers of pipeline and makes multi-integration steps of HVDC solved simultaneously.In the end,two examples are applied to verify the efficiency and practical applicability of the proposed method.Calculation results show that the proposed algorithm can enhance the calculation speed,supplying a novel approach for AC/DC system stability analysis.