摘要
随着可再生能源的大规模并网,电网源侧状态随机性增强,可能导致源侧静态功角失稳或负荷侧静态电压失稳,在线识别出电网静态失稳的主导模式对安全防控具有重要的指导意义。为此,首先基于两节点系统推导源侧和负荷侧的功率极限,以此建立统一量纲的源侧功角稳定裕度和负荷侧电压稳定裕度指标。然后,将原有面向负荷节点戴维南等值方法扩展至电源节点,完善了戴维南等值参数辨识方法的适用范围,为量化对比分析静态稳定的功角因素和电压因素提供了新的思路。最后,比较系统运行中2个裕度指标的变化态势,确定稳定的主导模式,并用仿真算例验证了所提稳定主导模式识别方法的有效性。
With large-scale integration of renewable energy, source side randomness of power grids may cause steady-state angle instability or voltage instability on load side. On-line identification of dominant static instability mode of power grids has important guiding significance for security control. For this reason, firstly, active power limits of source side and load side are deduced based on the two-node system, so as to establish angle and voltage stability margin indexes with uniform dimension on source side and load side. Secondly, based on Thevenin equivalence of load nodes, a method of Thevenin equivalent parameter identification for source node is proposed, providing a new idea for quantitative analysis of angle and voltage factors in static stability. Finally, change trend of the two margin indexes during system operation variation is compared, and the dominant stability mode is determined. Validity of the proposed method is verified by simulation results.
出处
《电网技术》
EI
CSCD
北大核心
2018年第1期276-284,共9页
Power System Technology
关键词
功角稳定
电压稳定
主导模式
戴维南等值
angle stability
voltage stability
dominantmode
Thevenin equivalence
