中国电机工程学报2024，Vol.44Issue(8)：3059-3071,中插10,14.DOI:10.13334/j.0258-8013.pcsee.223090
混合双馈入直流输电系统的高频振荡特征及机理研究
Research on High-frequency Oscillation Characteristics and Mechanism of the Hybrid Dual-infeed HVDC System
摘要
Abstract
The hybrid dual-infeed HVDC system presents different high-frequency oscillation characteristics with different tie-line lengths,due to the existence of line commutated converter based high voltage direct current(LCC-HVDC)system.To study the high-frequency oscillation characteristics and mechanism of the hybrid dual-infeed HVDC system,the state-space model of the system is established,and the high-frequency oscillation characteristics of the system are studied.The results show that the hybrid dual-infeed HVDC system presents different high-frequency oscillation characteristics under different tie-line lengths due to the existence of LCC subsystem.Then,a high-frequency impedance model of the hybrid dual-infeed system is established,and the effects of the LCC subsystem,tie-line length,MMC time-delay and AC line length on the system high-frequency impedances are studied.The results show that for the hybrid dual-infeed HVDC system without electrical proximity,the existence of the LCC AC filter eliminates the risk of high-frequency oscillation,and for the hybrid system with electrical proximity,the suppression effect of LCC AC filter on high-frequency oscillation decreases with the increase of tie-line length.Finally,a method to determine the critical length of tie-line without the risk of high-frequency oscillation for the hybrid dual-infeed HVDC system is proposed,and the effectiveness is verified by the theoretical analysis and electromagnetic transient simulation.关键词
混合双馈入直流输电系统/高频振荡/交流滤波器/联络线长度Key words
hybrid dual-infeed high voltage direct current(HVDC)system/high-frequency oscillation/AC filter/tie-line length分类
动力与电气工程引用本文复制引用
杨硕,郭春义,杜东冶,徐李清,张加卿..混合双馈入直流输电系统的高频振荡特征及机理研究[J].中国电机工程学报,2024,44(8):3059-3071,中插10,14.基金项目
国家自然科学基金(面上项目)(51877077). Project Supported by National Natural Science Foundation of China(General Program)(51877077). （面上项目）
