摘要
对一个典型的电力系统动态模型进行了分析 ,在考虑了负荷随机性基础上 ,建立了随机扰动的电压稳定模型。通过对引入无功负荷随机扰动项的系统进行数值仿真和理论分析 ,提出了负荷随机效应引起的电力系统电压失稳新的模式——当系统处于负荷水平比较紧张情况下 ,负荷的小幅波动的正向累积 ,会使得系统电压突然失稳 ,在电压骤降的同时发电机端相角基本维持恒定。此外 ,还给出了数值仿真结果理论上的解释 ,表明了仿真结果的合理性。
The random load characteristics in a sample power system were considered to develop a stochastic model for voltage stability. Theoretical analysis and numerical simulation of the model lead to a new pattern of voltage collapse where the voltage instability is induced by the positive accumulation of stochastic load disturbances in a heavy loaded power system. At the moment of collapse, the voltage drops sharply while the generator angle maintains fairly constant, which is supported by the simulation results. So a system which is stable under the deterministic model may become unstable when random disturbances of load are taken into account, which shows the need to use the stochastic load model.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2000年第9期9-12,共4页
Journal of Tsinghua University(Science and Technology)
基金
教育部博士点专项科研基金项目!(19990 0 0 34 7)
