摘要
随着双馈风电和高压直流输电(high-voltage direct-current,HVDC)在电力系统中的比例越来越大,电网换相换流器型HVDC(line-commutated converter based HVDC,LCC-HVDC)与双馈风电场、弱电网互联时会存在交互稳定问题,且振荡频率会呈现频率耦合特征。针对LCC-HVDC整流站存在的频率耦合现象,采用3-D傅里叶变换建立阻抗模型,分析LCC产生频率耦合现象的机理,进行各个影响因素对LCC频率耦合程度的敏感性分析。最后,研究频率耦合特性对LCC整流站、双馈风场、弱电网互联系统稳定性分析的影响,并通过时域仿真验证所得结论。
With the increasing proportion of doubly-fed wind turbines(DFIG) and high-voltage direct-current(HVDC)in the power system, there will be interactive stability problems when the line-commutated converter based HVDC(LCC-HVDC) is interconnected with the doubly fed wind farm and the weak grid, and the oscillation frequency will show the characteristics of frequency coupling. In order to study the frequency coupling phenomenon of LCC-HVDC rectifier station, the impedance model was established by using 3-D Fourier transform. The mechanism of frequency coupling phenomenon of LCC was analyzed, so was the sensitivity of various influencing factors to the frequency coupling degree of LCC. Finally, the influence of frequency coupling characteristics on the stability analysis of interconnected system, composed of the LCC rectifier station, doubly fed wind farm and the weak grid were studied. The conclusions were verified by time-domain simulation.
作者
年珩
刘一鸣
胡彬
李萌
廖玉茗
NIAN Heng;LIU Yiming;HU Bin;LI Meng;LIAO Yuming(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,Zhejiang Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第3期876-885,共10页
Proceedings of the CSEE
基金
青海省科技计划重大科技专项(2018-GX-A6)。
关键词
电网换相换流器型高压直流输电
阻抗模型
频率耦合特性
稳定性分析
line-commutation converter based high-voltage direct-current(LCC-HVDC)
impedance model
frequency coupling characteristics
stability analysis
