中国电机工程学报2024，Vol.44Issue(19)：7660-7670,中插14,12.DOI:10.13334/j.0258-8013.pcsee.230488
基于VSC的功率双向交直流互联系统直流侧阻抗特性分析及重塑
Analysis and Reshaping of DC-side Impedance Characteristic in VSCs-based Bidirectional Power AC/DC Interconnected System
摘要
Abstract
Voltage source converters(VSCs)-based AC/DC interconnected systems are increasingly studied and utilized due to their flexible access and efficient power conversion.However,the high proportion of renewable energy access and power electronics can cause stability issues,and the different power flow directions of the system can result in varying DC-side stability.In this paper,a DC-side admittance model of VSC is comprehensively established,taking into account factors such as bidirectional power flow,phase-locked loop(PLL),voltage and current control,and grid impedance.The DC-side admittance characteristics of VSC are analytically analyzed to reveal the origin of instability risk in the system.A DC voltage feedforward control method based on second-order differential loop is proposed to reshape the DC-side impedance of VSC for improving the stability of AC/DC interconnected system.Finally,a VSCs-based AC/DC interconnected system is constructed and emulated on the control-hardware-in-loop(CHIL)experimental platform to verify the accuracy of the analysis on the DC-side impedance characteristics and the effectiveness of the proposed impedance reshaping strategy.关键词
电压源型换流器/交直流互联系统/直流侧导纳模型/稳定性分析/阻抗重塑Key words
voltage source converter(VSC)/AC/DC interconnected system/DC-side admittance model/stability analysis/impedance reshaping分类
信息技术与安全科学引用本文复制引用
王垚鑫,李萌,年珩,廖玉茗,胡彬..基于VSC的功率双向交直流互联系统直流侧阻抗特性分析及重塑[J].中国电机工程学报,2024,44(19):7660-7670,中插14,12.基金项目
国家重点研发计划项目(2021YFC3100100). National Key R&D Program of China(2021YFC3100100). （2021YFC3100100）
