【作者】 王菲；

【导师】 刘怀东；

【作者基本信息】 天津大学 ， 电力系统及其自动化， 2006， 硕士

【摘要】 现代电力系统中输电走廊承受的压力日益沉重,由输电系统发生随机事故而引起系统失稳已成为影响系统安全稳定的主要原因。实践表明采用概率安全性分析方法可以较好研究发生随机事故后的系统安全性。近年来,在对输电系统概率安全分析的研究取得一定成果后,提出了概率不安全指标的模型。对输电线路上发生各种随机故障的动态安全域进行了大量仿真计算,发现了一些经验性规律:1)输电线路不同故障地点对应的动态安全域边界超平面之间具有近似平行性,且有一很小的空间夹角θ;2)以线路一端的动态安全域边界超平面作为参考平面,沿着线路延伸的方向,各个超平面与参考平面之间的相对夹角按同一趋势近似线性变化。据此推导出了一种快速计算输电线路上发生各随机故障的动态安全域的方法——角度均匀旋转法,其计算精度通过算例验证能够满足工程需要。基于角度均匀旋转法,给出了输电系统概率不安全指标的快速计算法。在输电系统概率不安全指标、角度均匀旋转法和基于动态安全域的最优紧急控制模型基础上,提出了基于概率不安全指标的紧急控制模型。该模型在考虑了各主要不确定性因素的影响的基础上,可制定出更优的紧急控制方案。IEEE 10机39节点新英格兰系统算例表明,该模型是可行的和实用的。更多还原

【Abstract】 The pressure of the modern power system transmission gallery has been more and more heavily. It has been the main reason for systems security operation that the systems loss its running stability because of the fault of transmission systems. It has been showed well that studying the system security after random faults uses the probabilistic security method. Currently, the model of probabilistic insecurity index has been established and presented based on the achievement of the study on the probabilistic analysis of transmission system.Based on this achievement, this dissertation makes a study of the Dynamic Security Region of various random faults and gains some regulations: 1) the corresponding hyperplanes of Dynamic Security Region of different fault locations have an extraordinarily good parallel property but still have a minor angle; 2) taking the hyperplane of the Dynamic Security Region of one end point of the transmission line as the reference, along the transmission line the diversity of the angles between the various location’s hyperplanes and the reference are approximation linear. Based on the above a rapid calculation method named angle even rotation is presented, the illustration indicates the precision of the method can meet the engineering demand.After establishment of the angle even rotation method, this dissertation makes it combination with index of the probabilistic insecurity and the model of optimistic transient stability emergency control to present an emergency control model based on probabilistic insecurity. This model can calculate the probability of systems losing stability and preserves the optimistic model’s feature. Test on the New England 10-generator 39-bus test system shows that the presented model is valid.更多还原