Modeling And Characteristic Analysis Of IEEE Excitation System Model Based On PSASP Platform

When short-circuit faults and impulse loads occur in power system,resulting iin large fluctuations of power grid voltage in a short time,the generator maintains the terminal voltage at a given level by rapidly adjusting the excitation system,which has a vital impact on the dynamic behavior of power system.Therefore,the study of excitation system model plays an important role in power system simulation analysis.PSASP,a power system simulation software independently developed by the Chinese Academy of Electric Power SciencesIhas flexible user interface and customized modeling functions.Most of its own models are based on the actual situation of China's operation site.In order to promote the further application of PSASP in the world and make PSASP become a power system simulation software with a wide user group,it is necessary to introduce and absorb the practical models of foreign simulation software.Based on the practical project of cooperation between China Electric Power Research Institute and Pakistan,this paper takes the establishment and characteristic analysis of IEEE standard excitation system model on PSASP platform as the research content,and the major work of this paper as follows:(1)According to the excitation power supply,the excitation model and IEEE standard excitation system model in PSASP model library are studied.The mathematical model,physical structure and parameter meaning of each type of excitation system are analyzed.The better excitation is performed in IEEE and PSASP.The system model compares the similarities and differences between its structure and parameters,analyzes the possibility of conversion between models,and summarizes the correspondence between different model transformations.(2)A model library of excitation model transformation relationships is established.The extensible markup language XML is used to describe the transformation mode in the pattern library.The conversion program of IEEE excitation model and PSASP excitation model is written in C++language.Finally,the dynamic verification is performed under the single-machine infinity system,which verifies the validity of the conversion program and the accuracy of the correspondence between the models.(3)Several reasons for the initial value imbalance in the excitation system modeling are analyzed.The principle and method of initial value balance for excitation system modeling are summarized.The 11 IEEE excitation systems that do not have a corresponding relationship with PSASP are provided by PSASP.The model of the UDM modeling platform was built.The DC excitation system model DC3A,the AC excitation system model AC7B and the static excitation system model ST2A were taken as examples.The dynamic simulation was carried out in the single-machine infinity system to verify the accuracy of PSASP UD modeling.(4)The maximum multiple of excitation voltage and the response time of excitation voltage are selected as the indexes to measure the dynamic performance of excitation system.The dynamic performance indexes of each excitation system are obtained through the strong excitation simulation experiment of generator set in single machine infinite bus system.Using CIGRE B4-39,wind speed disturbance and short-circuit faults are set respectively.By comparing the voltage regulation characteristics of the system with different excitation models,the influence of peak value multiple of excitation voltage and response time on the voltage regulation characteristics of the generator in the actual system is analyzed.The results of the thesis have been accepted and accepted by the project to meet the needs of the project.