波形松弛法的电力系统暂态稳定性并行仿真计算

仿真计算是进行电力系统暂态稳定性分析迄今为止最可靠的方法.本文提出一个基于波形松弛的电力系统暂态稳定并行仿真新方法.首先按照系统各部分的地理分区将其划分为多个子系统,将通过联络线及边界节点互联的子系统进行等值,从而得出相邻子系统对本子系统的影响;进一步将移置到边界处的子系统等值电流作为子系统间波形交互信息,实现互联子系统之间的解偶和并行松弛求解.在PC集群上的计算结果表明,该算法有比较高的并行加速比和计算效率,在无任何加速措施的情况下,对于较大规模的系统已达到了在线实时计算速度.

Parallel Calculation for Power System Transient Stability Based on Waveform Relaxation Method

Heretofore, time domain simulation is the most reliable method for power system transient stability analysis. In this paper, a new parallel calculation algorithm for power system transient stability analysis based on waveform relaxation method is presented. At first, the network is divided into several subsystems based on its geography subareas; each subsystem receives the influential messages from other subsystems being equivalence processed, which are connected by the tie lines and boundary buses; further, the equivalence currents transferred to the boundary buses of the relevant subsystems are considered to be the communication waveform information between the subsystems, and the boundary buses are treated as the voltage source; then the subsystems are naturally decoupled from each other, and the parallel calculation is finally realized. The result of the practical sample on the PC-Cluster system demonstrates that the new algorithm possesses high calculation efficiency and parallel speedup ratio, and can achieve on-line calculation for large-scale systems without any speedup measure.