Research On Accelerated Simulation Technology Of Electromagnetic Transient In Power System Based On UREP30

With the concept of new power system,China’s energy transformation continues to increase,a large number of new energy generation devices,a high proportion of power electronic equipment and new control and protection devices into the power system,making the characteristics of the various links in the modern power system and their interaction mechanism have undergone profound changes.To facilitate the implementation of new power systems,on the one hand,new technological routes for power facilities are highly costly in terms of trial and error and require extensive indepth simulation studies.On the other hand,for large-scale electromagnetic transient simulation of new power systems,the required simulation resources are huge,the cost of commonly used foreign simulation platforms is extremely high,and the key core technologies are in a stuck state,thus the flexibility and openness of platform applications are considerably restricted.In this paper,the ideal transformer model partitioning algorithm(ITM)is used to partition the built large-scale new power system model into several subsystems,realizing the decoupling and step-down of the large system,while a CPU multi-core parallel technology is used to design an accelerated simulation platform,UREP300,for efficient parallel computing in a bare-metal environment,to achieve accelerated simulation of large-scale power system models.The specific work is as follows:Firstly,the numerical calculation methods for electromagnetic transient simulation of power systems are discussed,several commonly used numerical integration methods and numerical calculation models for AC components are discussed,the calculation methods and simulation calculation processes for networks of EMTP programs are introduced,the calculation principles and calculation of three model partitioning interface algorithms,namely the long transmission line decoupling method,the state space node method(SSN)and the ideal transformer model method(ITM),are analyzed The calculation principles and calculation steps of three model partitioning interface algorithms,namely the long transmission line decoupling method,the state space node method(SSN)and the ideal transformer model method(ITM),are analyzed,their advantages and disadvantages are compared and the scope of application is pointed out.Next,the serial and parallel computation times of the ITM interface algorithm are presented.The open-loop transfer functions and stability criteria of voltage-based ITM interfaces for purely resistive,purely inductive,resistive-inductive and resistivecapacitive circuits have been analyzed and two methods have been proposed to improve the stability of split interfaces to some extent: interpolation prediction and impedance compensation.Among them,the impedance compensation method takes into account that the stability of the ITM-based interface algorithm is related to the equivalent impedance of the subsystems on both sides of the interface,and the method is such that the system stability criterion is changed to largely improve the stability of the segmentation model.Then,several existing novel dynamical system simulation techniques are reviewed and their respective characteristics and applicable scenarios are described separately.A multi-core parallel simulation platform UREP300 developed and designed by Guizhou University for large-scale electromagnetic transient simulation of novel power systems is introduced,and the platform architecture,bare metal programming mechanism and multi-core CPU scheduling techniques in bare metal are described.Finally,the structure of the new power system in the county is introduced,and a10 kV line in the medium voltage distribution network is used as a simulation arithmetic example,segmented and modeled,and offline simulation and multi-core parallel accelerated simulation based on UREP300 are carried out respectively,and the experimental results are compared,and it is concluded that the use of the ITM model segmentation algorithm and CPU multi-core parallel simulation technology can significantly improve the simulation accuracy while ensuring The simulation speed and scale of the simulation can be greatly improved by using the ITM model partitioning algorithm and CPU multi-core parallel simulation technology to achieve accelerated simulation of large-scale power systems.