基于二端口网络参数方程的电力电子变压器电磁暂态等效建模方法  

Electromagnetic Transient Equivalent Modeling of Power Electronic Transformer Based on Equations Using Two-port Network Parameters

作　　者：高晨祥 孙昱昊 王晗玥 郑聪慧 许建中 赵成勇 GAO Chenxiang;SUN Yuhao;WANG Hanyue;ZHENG Conghui;XU Jianzhong;ZHAO Chengyong(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206

出　　处：《电网技术》2023年第8期3396-3405,共10页Power System Technology

基　　金：北京市自然科学基金项目(3222059)。

摘　　要：电力电子变压器(powerelectronictransformer,PET)在大规模交直流混联和新能源并网中发挥着重要作用。由于PET高矩阵阶数与小仿真步长的特点,其电磁暂态(electromagnetic transient,EMT)仿真效率极低,无法满足精确快速仿真需求。该文以二端口PET为研究对象,给出一种基于二端口网络参数方程的等效建模方法。以双有源桥(dualactivebridge,DAB)型PET为例,通过模块内部传输参数的累乘、各模块混合参数的累加,以及各类参数之间的相互转换,给出了DAB型PET二端口等效电路及参数的获取方法。其次,通过PSCAD/EMTDC仿真测试,当模块数大于50,所提等效模型可实现对详细模型2个数量级以上的提速,最大相对误差小于3%。Power electronic transformer(PET)plays an important role in achieving the large-scale AC-DC hybrid power grid and new energy connection.However,the electromagnetic transient(EMT)simulation of the PET is extremely time-consuming due to the large number of electrical nodes and small simulation time-steps.Taking the two-port PET as the research object,an equivalent modeling method for PET based on the equations using the two-port network parameters is proposed in this paper.Taking the dual active bridge(DAB)type PET as an example,the equivalent circuit and parameters are obtained through the multiplication of the transmission parameters of the DAB internal subunits,the accumulation of the hybrid parameters of each DAB,and the mutual conversion between various parameters.The proposed model is verified in the PSCAD/EMTDC simulation platform.The results show that when the number of DAB is greater than 50,the equivalent model is able to achieve a speedup of more than 2 orders of magnitude compared with the detailed model,with the maximum relative error less than 3%.

关 键 词：电力电子变压器 电磁暂态 二端口网络 参数转换 

分 类 号：TM721[电气工程—电力系统及自动化]