摘要
在考虑负荷波动等随机因素的情况下，运用概率统计方法对电力系统电压稳定问题进行了分析。文中电力系统被看作一个在小幅度、广谱的随机扰动下不断作非线性波动的动态系统。利用大偏移理论，将其状态离开吸引域的期望时间作为电力系统电压稳定的裕度指标。通过对系统动态方程的分析，使用能量函数将随机模型转化为一确定性问题进行研究。对文献提出的函数加以改进，加入了转子能量函数项。通过算例分析，表明该能量值可作为电压稳定的裕度指标。
With consideration of small random disturbances of power system loads, a probabilistic voltage stability analysis is proposed. The power system is considered as a dynamic system that performs continuous non linear variation under small amplitude, wide spectrum disturbance. Analysis based on large deviation theory indicates that the expected exit time from the region of attraction for stable operating point can be used as an indictor of power system voltage stability. By applying the concept of exit time, under appropriate assumption, the stochastic model can be equivalent to a deterministic energy function. Energy function description is improved in this paper by adding a new term to describe rotor energy. Experimental results show that the energy function can be used as a marginal index of power system voltage stability.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1997年第9期29-32,共4页
Journal of Tsinghua University(Science and Technology)
基金
东北电力公司合作项目
关键词
大偏移理论
电压稳定
能量函数
电力系统
large deviation theory
voltage stability
energy function
exit time
