Uniform Equivalent Modeling Of Multi-Type Energy Storage System And Its Interface Design With PSASP

Large-scale energy storage battery access to the power system,will undoubtedly affect the operation of the power grid and operating performance,in order to analyze and evaluate this effect,must be in the power system simulation program access to energy storage power model.The detailed simulation model of any energy storage power source has the characteristics of high order number and multi-parameter,direct access to power system simulation program,can not meet the simulation requirements of large-scale power grid.In order to meet the demand of power grid after power storage,It is impossible and necessary to adopt the detailed simulation model of energy storage power directly,and it is necessary to construct the electromechanical transient equivalent model which can reflect the comprehensive equivalent characteristic of energy storage power and the time limit of electromechanical transient constant in power grid.Power system simulation is the main tool of power system design,planning and operation.Therefore,it is important to establish a model that accurately reflects the characteristics of energy storage system and apply the energy storage system to the power system simulation software.Link.This paper will focus on the above two important aspects of research,the main work and research results are as follows:Firstly,the basic principle of system modeling is described in detail,and the parameter identification method and model identification process based on genetic algorithm are proposed.Secondly,by describing the dynamic characteristics of the energy storage system,it is found that the energy storage power source,in the transient process of disturbance,The output power of the grid is the constant dynamic characteristic of the corresponding dynamic characteristic rather than its steady state.The equivalent circuit model of the energy storage system is put forward.The related parameters of the model are identified by genetic algorithm.Finally,from the description ability of the model,Stability and the adaptability of the model to the different types of energy storage system.The results show that the model is effective for different types of electrochemical battery energy storage system and super capacitor energy storage.The system has good adaptability and good stability of model parameters,good description ability(small fitting error),and simple structure and few parameters.It has good engineering practicability for the simulation of transient stability of large scale power network.Based on the PSASP/UDM graphics modeling environment,this paper adopts the basic function framework of user custom modeling,and realizes the user custom modeling of electromechanical transient model of energy storage system according to the mathematical model of electromechanical transient model of energy storage system.The correctness of the user-defined model and PSASP interface is verified by the case study of Hunan power grid and the IEEE-14 node which comes with PSASP.At the same time,this paper uses the C ++ language to edit the user program of the electromechanical transient model of the energy storage system in the PSASP/UPI environment.In strict accordance with the PSASP user program interface rules,the user program and the PSASP transient stability calculation are solved alternately through the interface data transfer,It is a new way to apply the measured model to the power system simulation and systematically study the influence of the energy storage system on the power grid.Finally,the EPRI-36 node of PSASP is used to verify the correctness of the connection between the user program and PSASP.