摘要
为了分析电力系统的小扰动电压稳定性,该文基于发电机和感应电动机的详细动态模型建立了一个单发电机-感应电动机系统的改进Phillips-Heffron(P-H)模型,并应用它给出了电压振荡的阻尼因子γ的解析式,该式明显地说明了感应电动机负荷给系统的电压振荡所带来的阻尼。将其同以往在基于静态负荷的P-H模型下得到的观点相比较可知:感应电动机的存在对系统小扰动失稳模式有着重要影响,它的存在抑制了系统中可能发生的振荡。利用γ的解也可以从理论上解释在小扰动电压稳定仿真中发现的慢速励磁调节系统与大容量之间共同作用产生的负阻尼现象。
In order to analyze small signal voltage stability in power systems, a modified Phillips-Heffron(P-H) model based on Single Generator Single Motor system is proposed with dynamics of induction motor and generator considered. This model is used to derive a voltage oscillation damping factor γ, while analytic form of γ illustrates the damping brought out by induction motor. Comparing with preliminary P-H model under static load model assumption, it is evident that induction motor plays an important role in small signal instability mode and its existence has a tendency to eliminate oscillation. In addition, modified P-H model and γ can be well used to explain negative damping phenomena coming from coexistence of slow-acting excitation systems and large capacitor compensation.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2003年第12期19-22,共4页
Proceedings of the CSEE
基金
国家重点基础研究专项经费项目(G1998020307)
关键词
电力系统
小扰动电压稳定分析
P-H模型
振荡阻尼因子
感应电动机
Power system
Small signal voltage stability
Phillips-Heffron model
Bifurcation
Voltage oscillation damping factor
