摘要
高压直流输电系统(HVDC)对三峡电站运行的影响一直是国内外广泛关注课题.在深入分析了三峡直流输电系统非特征谐波产生机理的基础上,研究了互调谐波对电站水轮发电机组轴系的影响.利用MATLAB仿真软件建立了考虑发电机组轴系的三峡交、直流混合输电系统的仿真模型.通过时域仿真的方法分析了直流输电系统在送、受两端电网频率不一致的情况下引起的互调谐波次相关分量对三峡电站水轮发电机组轴系的影响.最后利用频域复转矩系数法的计算结果进一步检验了时域仿真结果的正确性.
Widely concerns of the influence of the HVDC system on the Three Gorges power station have been shown so far. Based on the understanding of the mechanism of the non-characteristic harmonics introduced by HVDC system, the influence of interharmonics on the shaft of hydro-generator unit is studied. A MATLAB simulation model for the Three Gorges hybrid AC and DC transmission system with considering the effect of generator-unit shaft is established. Through time-domain simulation, the influence of the minor-associated component of interharmonics on the generator-unit shaft is analyzed, which arise from the asynchronous operation of the HVDC system. Also, the complex torque coefficient method in frequency-domain is used to analyze this problem. Same conclusions can be drawn from the results of timedomain and frequency-domain analyses.
出处
《重庆大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2006年第1期36-40,共5页
Journal of Chongqing University
关键词
高压直流输电系统
互调谐波
次同步谐振
high voltage direct current transmission system
interharmonics
subsynchronous resonance