考虑动态负荷机械转矩参数的节点暂态电压评估  

Assessment of Transient Voltage Stability of Load Bus Considering Mechanical Torque of Dynamic Load

作　　者：何笠[1] 李兴源[1] 徐梅梅 

机构地区：[1]四川大学电气信息学院,四川省成都市610065 [2]贵州电力试验研究院,贵州省贵阳市550005

出　　处：《电力系统自动化》2010年第19期11-14,19,共5页Automation of Electric Power Systems

基　　金："十一五"国家科技支撑计划资助项目(2008BAA13B01)~~

摘　　要：动态负荷的主要成分是电动机,其负荷特性是电力系统节点暂态电压稳定性的重要影响因素,但目前相关研究未考虑电动机负荷机械转矩特性。文中在简化感应电动机模型基础上,结合电动机负荷机械转矩变化,提出了极限切除时间解析方法。得到的极限切除时间指标能反映负荷节点暂态电压稳定状态,可以作为节点暂态电压稳定性指标。IEEE30节点系统的仿真结果表明,所述方法计算出的极限切除时间能真实反映电动机负荷的实际运行特性,是评估系统暂态电压稳定性的良好指标。Motors are main parts of dynamic loads in a power system. The characteristics of motors can reflect the transient voltage stability of a bus. However, there still lacks suitable index to properly evaluate transient voltage stability when considering mechanical torque in a induction motor load. With induction motor model and its equivalent circuit, considering the mechanical torque, an analytic method is presented to calculate the critical clearing time of transient voltage stability. The critical clearing time reveals transient voltage stability of a bus and can be used as an index. The simulation results of IEEE 30-bus system show that the critical clearing time calculated using this method can reflect the practical characteristics of motor loads and is a good index to estimate the transient voltage stability.

关 键 词：暂态电压稳定 机械转矩 感应电动机模型 极限切除时间 

分 类 号：TM712[电气工程—电力系统及自动化]