摘要
大规模风电集群与系统交互作用引发的次同步振荡严重威胁电网运行安全。文中提出一种基于系统阻抗辨识的次同步振荡控制实现框架及计算方法。通过辨识电网侧和风场支路阻抗得到系统序阻抗,基于系统序阻抗实部值的变化来判定稳控系统切除不同风场馈线的有效性,考虑不同风场对系统阻抗的影响大小并基于最小切除量原则制定次同步振荡控制策略。针对实际电网中电网侧阻抗及风场支路阻抗难以辨识的难点,提出电网侧阻抗极限值预估和风场支路阻抗在线测量方法。基于PSCAD/EMTDC仿真平台构建沽源地区实际风场群并网系统模型,验证了所提次同步振荡控制策略的有效性。
Sub-synchronous oscillations caused by the interaction between large-scale wind power clusters and the power system seriously threaten the safety of power grid operation.This paper proposes an implementation framework and calculation method for sub-synchronous oscillation control based on system impedance identification.The system impedance is obtained by identifying the grid-side impedance and the impedance of wind farm branches.Based on the change of the real part of the system impedance,the effectiveness of the stability control system in cutting different wind farm branches is determined.Considering the influence of different wind farms on the system impedance,the control strategy for the sub-synchronous oscillation is formulated based on the principle of minimizing cut-off quantity.Aiming at the difficulty in identifying the grid-side impedance and the impedance of wind farm branches in the actual power grid,the methods for predicting the limit value of grid-side impedance and online measurement for the impedance of wind farm branches are proposed.Based on the PSCAD/EMTDC simulation platform,the actual power grid model in Guyuan area of China is constructed,which verifies the effectiveness of the proposed control strategy for sub-synchronous oscillation.
作者
薛峰
吴家龙
崔晓丹
冯佳期
许剑冰
徐海波
XUE Feng;WU Jialong;CUI Xiaodan;FENG Jiaqi;XU Jianbing;XU Haibo(NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China;State Key Laboratory of Smart Grid Protection and Control,Nanjing 211106,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2023年第5期200-207,共8页
Automation of Electric Power Systems
基金
国家电网有限公司总部管理科技项目(5100-202155295A-0-0-00)。
关键词
风电并网系统
次同步振荡
阻抗法
控制策略
安全稳定
wind power grid-connected system
sub-synchronous oscillation
impedance method
control strategy
security and stability
