摘要
基于模块化多电平换流器的柔性直流输电技术逐步成为大型风电场最佳并网方案,而该系统存在宽频振荡的风险。为抑制该类振荡,基于特征值分析法求取了系统主导振荡模式,并进一步定量分析了系统各参数对振荡失稳模式的动态影响,得出了通过调节风电场网侧变流器控制参数可有效提升系统阻尼比的结论,并提出了一种基于特征值灵敏度的风电场网侧变流器控制参数优化算法;为进一步降低系统发生振荡的风险,使系统适应多种运行工况,在风电场与直流换流站间增设了虚拟电阻,并设计了基于该虚拟电阻的直流换流站送端变流器的附加阻尼控制器。基于PSCAD/EMTDC构建了系统时域仿真模型,仿真结果表明,风电场网侧变流器控制参数优化与基于虚拟电阻的附加阻尼控制器相结合的复合式振荡抑制方法具有更好的阻尼效果。
Flexible DC transmission technology based on modular multilevel converter has gradually become the best grid connection scheme for large wind farms,and the system has the risk of broadband oscillation.In order to suppress this kind of oscillation,this paper calculates the dominant oscillation mode of the system based on eigenvalue analysis method,and further quantitatively analyzes the dynamic influence of various parameters of the system on the oscillation instability modes.It is concluded that the damping ratio of the system can be effectively improved by adjusting the control parameters of the grid-side converter of the wind farm,and a control parameter optimization algorithm of the grid-side converter of the wind farm based on eigenvalue sensitivity is proposed.In order to further reduce the oscillation risk of the system and make the system adapt to various operation conditions,a virtual resistance is added between the wind farm and the DC converter station,and an additional damping controller of the DC converter station sending-end converter based on the virtual resistance is designed.The time domain simulation model of the system is built based on PSCAD/EMTDC.The simulation results show that the compound oscillation suppression method combining the control parameters optimization of grid-side converter and the additional damping controller based on virtual resistor has better damping effect.
作者
陈肖璐
王新宇
任正
杨熠
周伟
刘荣顺
CHEN Xiaolu;WANG Xinyu;REN Zheng;YANG Yi;ZHOU Wei;LIU Rongshun(Electric Power Research Institute,State Grid Inner Mongolia Eastern Electric Power Co.,Ltd.,Hohhot 010020,China;School of Automation,Wuhan University of Technology,Wuhan 430070,China)
出处
《南方电网技术》
CSCD
北大核心
2023年第3期126-135,共10页
Southern Power System Technology
基金
国网内蒙古东部电力有限公司科技项目(526604220007)。
关键词
振荡模式
控制参数优化
虚拟电阻
附加阻尼控制器
复合控制
oscillation mode
control parameters optimization
virtual resistance
additional damping controller
compound control
