重庆大学学报2025，Vol.48Issue(9)：21-36,16.DOI:10.11835/j.issn.1000-582X.2024.205
光伏虚拟同步发电机经高压直流输电送出系统稳定性研究
Analysis of subsynchronous oscillation characteristics of photovoltaic virtual synchronous generators integrated with MMC-HVDC
刘国庆 1李彦哲 1刘源涛 1王颖2
作者信息
- 1. 兰州交通大学 自动化与电气工程学院,兰州 730070
- 2. 平顶山姚孟发电有限责任公司,河南 平顶山 467031
- 折叠
摘要
Abstract
To address the issue of subsynchronous oscillation(SSO)arising when photovoltaic virtual synchronous generators(VSG_PV)transmit power through modular multi-level converter-based high-voltage direct current(MMC-HVDC)systems,a linearized mathematical model of the system is developed.An improved virtual synchronous control strategy is proposed.Using the eigenvalue analysis method,the study reveals that,under power disturbances,several factors-including the active and reactive control links,virtual inductance,MMC-HVDC bridge arm inductance,and current vector control loop-significantly affect the damping and frequency characteristics of SSO in the VSG-PV system.These findings are validated through simulation on the PSCAD/EMTDC platform.Results show that the integration of the VSG function introduces a sub-synchronous oscillation mode in which both the photovoltaic VSG and MMC-HVDC participate during power disturbances in the outgoing system.On the VSG side,an excessively large active frequency modulation coefficient Kf or a too-small virtual inductance Lv can lead to system instability;on the MMC-HVDC side,increasing the integral coefficient of the voltage loop Ki4 may induce system instability,whereas increasing the bridge arm inductance Lg enhances system stability.关键词
虚拟同步发电机/MMC-HVDC/次同步振荡/小信号分析Key words
virtual synchronous generators/MMC-HVDC/subsynchronous oscillation(SSO)/small signal analysis分类
信息技术与安全科学引用本文复制引用
刘国庆,李彦哲,刘源涛,王颖..光伏虚拟同步发电机经高压直流输电送出系统稳定性研究[J].重庆大学学报,2025,48(9):21-36,16.
