启发式电力系统暂态稳定裕度在线评估方法研究

本文定义了一个能综合反映电力系统特定结构和运行方式下整体暂态稳定水平的连续指标：综合临界切除时间。结合知识库，模糊逻辑推理和综合技术，本文提出了一种能以较高精度在线估计ＧＣＣＴ值的暂态稳定估计方法。

RESEARCHES ON HEURISTIC POWER SYSTEM TRANSIENT STABILITY MARGIN ON-LINE ASSESSMENT METHOD

An analogue index,i.e.,the generalized critical clearing time (GCCT),is defined to reflect the overall transient stability level of power system under certain operation states.With the combination of knowledge base, fuzzy logical reasoning and defuzzification techniques, a novel heuristic method for power system transient stability assessment (TSA) is then proposed in this paper.Both the values of GCCT and the group of generators with lower transient stability margin can be on line predicted and identified by the suggested method. The construction of knowledge base, the fuzzy reasoning model and the prediction of GCCT are all described in detail in this paper on the example of 7 machine power system, while some discussions about the enhancement of the method is presented at the end of the paper. Digital simulation tests based on different power systems prove the effectiveness of the proposed method.