基于MATE的电力系统分网多速率电磁暂态并行仿真方法

针对电力系统电磁暂态仿真效率低的问题,提出一种基于MATE的分网多速率电磁暂态并行仿真方法,该方法支持2种及2种以上仿真步长。提出了主同步时刻、子同步时刻和非同步时刻等概念以描述不同时刻的求解过程。在非同步时刻,通过大步长和中步长子网戴维南电势插值结果计算连接线电流,完成小步长子网的计算;在子同步时刻,利用大步长子网戴维南电势插值结果计算连接线电流,并综合考虑中步长内连接线电流的累积效应,完成中步长和小步长子网的计算;在主同步时刻,通过各子网戴维南等值计算连接线电流,并综合考虑大步长内连接线电流的累积效应,得到全网络的仿真结果。仿真算例表明,该方法可以根据所划分子网的特性选择合适的仿真步长,能在基本不损失仿真精度的前提下大大提高仿真效率,对实现大规模电力系统的实时仿真具有重要理论和实践意义。

Multi-rate Electromagnetic Transient Parallel Simulation of Power System Based on MATE

In order to solve the problem of low efficiency of electromagnetic transient simulation in power system,we put forward a method of multi-rate electromagnetic transient parallel simulation based on MATE,which supports two or more kinds of simulation steps.The concepts of main synchronization,sub-synchronization and non-synchronization are proposed to describe the solution at different moments.At the time of non-synchronization,the calculation of the sub-network with small step is carried out by using the Thevenin’s equalization and Thevenin’s theorem interpolation.At the time of sub-synchronization,the calculation of sub-network with medium and small step is completed by using interpolation results and acquiring connecting line current.At the time of synchronization time,sub-networks are decoupled,and computing of whole network is completed by acquiring connection line current.The simulation results show that the proposed method can select the appropriate simulation step according to the characteristics of the sub-net,and can greatly improve the simulation efficiency without losing the simulation accuracy,which has important theoretical and practical significance for real-time simulation of large-scale power system.