摘要
由于电力系统具有许多不确定因素,利用确定性方法无法准确对发电机轴系遭受暂态扭矩放大风险进行评估,文中提出了一种暂态扭矩放大的风险评估方法。该方法考虑了故障切除时间对暂态扭矩的影响,并引入概率配点法求解暂态扭矩的概率密度函数。同时定义了发生暂态扭矩放大的严重程度函数。在此基础上,文中定义了发电机轴系受损的研究区域,缩小了风险评估的范围,从而更加全面准确地得出发电机轴系遭受暂态扭矩放大的风险评估结果。最后,通过IEEE16机68节点系统的算例说明了该评估策略的有效性和实用性。
Because the power system has many uncertainties, the deterministic method can not evaluate the risk of the shaft of the generator suffer from the transient amplification accurately, this paper presents a risk evaluation method. It takes the influence of fault clearing time on the transient torque into account, and introduces probabilistic collocation method to solve the probability density function of the transient torque. Meanwhile, it also defines the severity function of the transient torque amplification. On this basis, it determines the study area of the shaft of generators suffer from damage, reduces the scope of risk assessment, and thus more comprehensive and accurate risk assessment results is obtained. Finally, The results of calculation example of typical IEEE 16-machine 68-bus system show that the proposed assessment strategy is effective and practical.
作者
程欣
CHENG Xin(Wuxi Power Supply Company of State Grid Jiangsu Electric Power Co., Ltd.,Wuxi 214000,China)
出处
《电力工程技术》
2019年第4期171-176,共6页
Electric Power Engineering Technology
关键词
暂态扭矩放大
概率配点法
风险评估
transient torque amplification
probabilistic collocation method
risk assessment
