中国电机工程学报2024，Vol.44Issue(z1)：227-239,13.DOI:10.13334/j.0258-8013.pcsee.240233
计及异频耦合谐波的模块化多电平矩阵变换器阻抗建模
Impedance Modeling of Modular Multilevel Matrix Converter Considering the Differ-frequency Coupling Harmonics
摘要
Abstract
The modular multilevel matrix converter(M3C)is the core equipment of the low frequency transmission system(LFTS).The two AC systems with different frequency that M3C is connected to are directly coupled in the converter arms.And the arm electrical quantities contain not only the integer harmonics of the fundamental frequencies of both AC sides,but also the non-integer order harmonics generated by their interactive coupling(called differ-frequency coupling harmonics).Ignoring the dynamic DC voltage of the submodule and the differ-frequency coupling harmonics and taking the fundamental frequency as the frequency interval,the multi-harmonic linearization modeling method is difficult to accurately describe the harmonic characteristics of M3C,thus reduces the accuracy of the impedance model.Moreover,it cannot reveal the mechanism how the DC voltage dynamic of the submodule and the harmonics affect the impedance characteristics.In this paper,based on the harmonic analysis of M3C and considering the differ-frequency coupling harmonics,a multi-harmonic vector model in frequency domain is established firstly.Through analyzing the phase sequence and transfer relations of the multi-harmonic small signals of the M3C 9 arms,the M3C power stage model can be reduced to that of one arm,so the impedance modeling complexity is reduced.On this basis,the impedance model of M3C is developed including the effects of control loops coupling that can accurately reflect the impact of DC voltage dynamic and harmonic characteristics.Finally,the accuracy of the M3C impedance model is verified through RT-Lab real-time simulations and sweeping experiments,and the key factors affecting the impedance characteristics are analyzed.关键词
低频输电系统/模块化多电平矩阵变换器/阻抗建模/多谐波线性化/异频耦合Key words
low frequency transmission system/modular multilevel matrix converter(M3C)/impedance modeling/multi-harmonic linearization/differ-frequency coupling分类
信息技术与安全科学引用本文复制引用
孙玉巍,陶聪,付超,常静恬,查夏新,李光辉..计及异频耦合谐波的模块化多电平矩阵变换器阻抗建模[J].中国电机工程学报,2024,44(z1):227-239,13.基金项目
河北省自然科学基金项目(E2019502172) （E2019502172）
中央高校基本科研业务费专项资金(2022MS072).Project Supported by Natural Science Foundation of Hebei Province(E2019502172) （2022MS072）
The Fundamental Research Funds for the Central Universities(2022MS072). （2022MS072）
