基于不同等值机的暂态稳定分析与控制(英文)

Transient Stability Analysis and Control Based on Different Equivalents

定义了单一等值机的能量型稳定裕度。在不平衡稳定点将机组动态地分为受扰严重和受扰不严重的机组,研究比较了单机无穷大母线(one machine infinite bus,OMIB)等值机和2个等值机组的暂态稳定裕度、紧急控制算法和预防控制算法。发现单等值机组的稳定裕度、紧急控制和预防控制需要调节的机械功率和OMIB等值机完全相等。更好地理解了基于不同等值机暂态稳定的一致性以及等值机组机械功率的调节对暂态稳定的影响。通过具体的算例验证了该理论的正确性,为OMIB等值的暂态稳定分析和控制,特别是预防控制提供了理论基础。

Energy type stability margin for different equivalents was proposed. By using the dynamic identification of the equivalents near the unstable equilibrium point time, the one machine infinite bus （OMIB） based transient stability margin, preventive and emergency control were compared with the transient stability margin, preventive and emergent control based on cr/tical machine and non-cr/tical machine equivalents. It is discovered that single equivalent based stability margin, preventive and emergent mechanical power adjustment is exactly identical with the stability margin, emergent mechanical power adjustment based on OMIB equivalent. System transient stability analysis results verify the theoretical results. The new discovery is never addressed in the literatures and is valuable for better understanding the stability margin consistency, the contribution and impact of mechanical power changes to transient stability. The work is theoretically a useful extension to the currently established framework for OMIB transient stability analysis and control, especially for the preventive control.