Phasor Analytical Model of Non-isolated DC/DC Converter Based on Modular Multilevel Converter for DC Transmission Grids  

作　　者：A.Jamshidi Far D.Jovcic 

机构地区：[1]School of Engineering,University of Aberdeen,Aberdeen,UK

出　　处：《Journal of Modern Power Systems and Clean Energy》2023年第2期611-621,共11页现代电力系统与清洁能源学报（英文）

摘　　要：Non-isolated DC/DC converter based on modular multilevel converter(MMC)technology is expected to play an important role in future DC transmission grids.This paper presents a phasor analytical model for this new family of converters which is suitable for a range of studies like DC grid power flow or DC/DC parametric design.The 30th-order phasor model is derived in 3 coordinate frames:zero sequence(DC),fundamental frequency(dq),and double frequency(d2q2).The second-harmonic current suppression control is included as an option.Additionally,an estimation of the required control signals is presented,and a closed-loop model is developed which facilitates direct calculation of all variables and fast parametric studies.The accuracy of the proposed models is verified against a detailed PSCAD model for a wide range of parameters.The studies illustrate the importance of the second-harmonic components on the model accuracy.Finally,the impact of the converter parameters on the performance is studied,and a basic eigenvalue stability analysis is given.

关 键 词：High-voltage direct current(HVDC)transmission modular multilevel converter(MMC) non-isolated DC/DC converter phasor modelling 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM46