中国电力2025，Vol.58Issue(3)：73-85,13.DOI:10.11930/j.issn.1004-9649.202405012
柔性直流输电系统多端异构通用化阻抗建模与分析
Multi-terminal Heterogeneous Generalized Impedance Modeling and Analysis of MMC-MTDC Transmission Systems
摘要
Abstract
The prominent risks of broadband oscillation among renewable energy,modular multilevel converter-based multi-terminal high voltage direct current(MMC-MTDC)and AC grid severely constrain the safe and stable operation and efficient accommodation of renewable energy.The control strategies of different converter stations of MMC-MTDC are various such as constant AC voltage,constant DC voltage and constant power control,and there is a strong nonlinear coupling between the multi-terminal converter stations,which brings challenges to the modeling and analysis of the system oscillation.Therefore,a modular modeling method of MMC-MTDC control system considering positive-sequence and negative-sequence control is firstly proposed in this paper.And then,aiming to the complex AC and DC grid structures,a generalized impedance model of different sections of MMC-MTDC is established with the multi-terminal nonlinear coupling considered.Finally,taking the three-terminal MMC-MTDC ring network as an example,simulation is conducted to verify the accuracy and validity of the generalized impedance model.The coupling effects of the multi-terminal interconnection system and the positive-sequence control and negative-sequence control on the impedance characteristics are analyzed,which will provide a basis for the oscillation analysis of renewable energy base connected into MMC-MTDC interconnection system.关键词
MMC-MTDC/通用化阻抗模型/宽频振荡/正负序控制/多端耦合Key words
MMC-MTDC/generalized impedance model/broadband oscillation/positive-and negative-sequence control/multi-terminal coupling引用本文复制引用
周国梁,高丽萍,梁言桥,李文津,王鑫..柔性直流输电系统多端异构通用化阻抗建模与分析[J].中国电力,2025,58(3):73-85,13.基金项目
中国电力工程顾问集团科技项目(海上风电场柔性直流送出系统宽频谐振机理与抑制方案研究,DG2-D03-2022) （海上风电场柔性直流送出系统宽频谐振机理与抑制方案研究,DG2-D03-2022）
国家电网有限公司科技项目(100%新能源发电基地经二极管整流送出组网拓扑与运行控制技术研究,5108-202218280A-2-307-XG). This work is supported by China Electric Power Engineering Consulting Group Technology Project(Research on Broadband Resonance Mechanism and Suppression Scheme of Flexible DC Transmission System in Offshore Wind Farm,No.DG2-D03-2022),Science and Technology Project of SGCC(Research on Grid-Forming Topology and Operation Control Technology of 100%Renewable Energy Generation Base Connected into Diode Rectifier,No.5108-202218280A-2-307-XG). （100%新能源发电基地经二极管整流送出组网拓扑与运行控制技术研究,5108-202218280A-2-307-XG）
