基于归一化能量函数的临界切除时间并行仿真算法

随着新能源的广泛接入和电力系统的发展，新一代问题面临更为严峻的挑战，评估和求取临界切除时间是分析的关键环节。基于归一化能量函数，利用最小归一化暂态动能曲线与临界切除时间的关系，提出一种并行计算临界切除时间的仿真算法，并且基于IEEE10机39节点系统和宁夏实际电网，对算法的有效性和速度进行了验证，说明算法能准确、快速稳定地计算临界切除时间。

Parallel simulation computation of critical clearing time based on normalized energy function

With the extensive integration of new energy and the development of power system, the scale of the new electric power system is becoming larger. In the meanwhile, its security and stability are facing more severe challenges. The key link of analysis is evaluating and calculating critical clearing time (CCT). Based on norma- lized energy function, depending on the relationship between the minimum normalized transient kinetic energy curve and CCT, parallel computation by simulation is proposed for calculating CCT. The validity and the speed of the proposed algorithm are verified based on IEEE 10-machine 39-node system and the actual electric po- wer system in Ningxia. It is proved that the proposed algorithm can calculate CCT accurately, quickly, and stably.