The Research Of Electromagnetic Transient Parallel Simulation Technology Based On GPU

With the development of power grid,the scale of system is expanded contin-uously and the complexity is also increased gradually.This makes the calculation of EMT(Electromagnetic Transient)simulation more and more large.The traditional algorithm and model based on CPU can not meet the urgent needs.Recently,the Graphics Processing Unit(GPU)has developed rapidly and has been widely used in big data and neural networks.But it has less application in power system.Therefore,it is imperative to research how to use GPU's great computing power to accelerate numerical calculation,thus improving the simulation efficiency.In this paper,two aspects,the GPU parallel acceleration and model optimiza-tion,are researched to improve the efficiency of EMT simulation.The main work of this paper is as follows:Firstly,the basic principle of frequency reduction by rotation transformation is resrarched.And a new construction method of analytic signal is presented which is based on triangulation transformation.On this basis,the improved models of single phase lossless,single-phase lossy and three-phase transmission line is derived,and are realized by C++.The validity of the model is verified by comparing with the simulation results.Secondly,the architecture of GPU and the programming model of CUDA platform are studied.By comparing with CPU,the advantages and disadvantages of parallel computation based on GPU and the programming characteristics of CUDA kernel function are reserached in detail.Thirdly,the classical methods of solving sparse linear equations are studied and the implementation feasibility of them is also analyzed.The LU decomposition and the previous and back generation are optimized parallelly.The feasibility and efficiency of this algorithm are verified by six examples.Finally,on the basis of the research about improving model of transmission line and GPU parallel solving,a EMT simulation program is compiled on Visual Studio 2015 platform by C++.The functions which include parallel solving linear equations and large step simulation of transmission line are realized.The correctness of the program is verified by comparing with the extended IEEE14 node system simulation.