【摘要】 为研究大扰动事故注入系统扰动能量对线路和系统冲击大小,从熵的基本原理出发,结合广义支路能量在系统中的空间分布聚集程度,建立基于能量分布熵的线路后果脆弱评估模型;依据近似熵原理和广义支路能量在线路中的周波时段振荡态势,提出基于能量周波互近似熵的线路周波冲击脆弱评估模型。通过对新英格兰10机39节点系统的模拟计算发现:线路发生大扰动后,扰动注入系统的总能量越大,能量分布熵越小,局部空间聚集的能量越多,该线路后果脆弱度越高;既定扰动故障模式下,线路的周波互近似熵越小,周波脆弱度越高,周波脆弱度动态反映了线路随周波时段推移的脆弱度,计及各周波受扰冲击的综合脆弱指标全面反映了线路的扰动冲击强度。通过与其他方法评估结果的比较分析可知,基于广义支路能量时空分布熵测度的线路受扰冲击脆弱度评估模型物理意义明确,评估结果符合实际。更多还原

【Abstract】 In order to study the destabilization of power system and line affected by transient energy distributed in post-fault power system. Based on the basic principle of entropy and the spatial distribution of the generalized branch energy, the consequence vulnerability assessment model according to the distribution entropy of energy was proposed. Based on the basic principle of approximate entropy and the oscillation generalized branch energy in cycle, the shock vulnerability assessment model according to the cross approximate entropy of energy was proposed. Simulation results on the IEEE 39-bus system indicate that the energy distribution entropy smaller and the injection energy of system grater, the local space energy gather and the consequence vulnerability of line grater. It also show that the cross approximate entropy of energy cycle smaller, the shock vulnerability of line grater. The integrated vulnerability index consider disturbance of all cycle, can comprehensive reflect the disturbance of line. The vulnerability assessment model according to entropy measure of the generalized branch energy has a clearer physical meaning, more comprehensive and more realistic compared with used other model.更多还原