摘要
风电场经基于模块化多电平换流器的柔性直流输电系统（modular multilevel converter based high-voltage direct current,MMC-HVDC）并网时易出现次同步振荡现象。引入谐波状态空间建模方法建立了MMC的多频率耦合模型,在此基础上,利用谐波线性化原理推导了计及内部动态过程的MMC交流侧小信号阻抗模型。从阻抗特性的角度揭示了风电场经MMC-HVDC并网系统的失稳机理。在失稳机理分析的基础上,分别从风电场侧MMC换流站和风电场两方面提出了互联系统的镇定控制方法,并对控制参数进行了设计。基于Matlab/Simulink建立了风电场经MMC-HVDC并网系统的时域仿真模型,仿真结果验证了理论分析的正确性和所提方法的有效性。
Subsynchronous oscillation（SSO） may occur in wind farms connected to modular multilevel converter-based high-voltage DC transmission（MMC-HVDC） systems. The multi-frequency coupling model of the MMC was established by using the harmonic state-space（HSS） modeling method. On this basis, the AC-side small-signal impedance of the MMC was derived according to the harmonic linearization principle, which takes into account the internal dynamics of the MMC. The instability mechanism of the interconnected system was revealed from an impedance characteristic perspective. Based on the instability mechanism analysis, several stabilization control methods were proposed from two aspects of wind farm side MMC station and wind farm, respectively, where the control parameters were designed. The time-domain simulation model of wind farm integration through an MMC-HVDC system was built by Matlab/Simulink. The simulation results validate the theoretical analysis and the proposed stabilization control methods.
作者
吕敬
蔡旭
Lü Jing;CAI Xu(Wind Power Research Center,School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Minhang District,Shanghai 200240,Chin)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2018年第14期4074-4085,共12页
Proceedings of the CSEE
基金
国家重点研发计划课题(2016YFB0900901)
上海市科委科研计划项目(16DZ1203402)~~
关键词
模块化多电平换流器
高压直流输电
风电场
稳定性
稳定控制
modular multilevel converter （MMC）
high-voltage DC transmission （HVDC）
wind farm
stability
stabilization control
