含感应电动机的独立电力系统暂态电压分析  

Transient voltage stability of independent electric power systems with induction motors

作　　者：王义红[1] 张雪敏[1] 孙玉娇[1] 梅生伟[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,电力系统及发电设备控制和仿真国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2011年第1期36-42,共7页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50977047)

摘　　要：针对含感应电动机的独立电力系统的暂态电压稳定问题,首先详细推导了适用于暂态电压稳定分析的多电动机多发电机电力系统模型,该模型不但可以有效地消除平衡点处Jacobi矩阵的0特征根,保证与原系统的等价性,而且消去了所有的代数变量,建立了一个纯微分方程组,方便进一步分析。然后给出一种具有一定工程实用性的启发式的暂态电压稳定与暂态功角稳定的界定方法。最后将一种基于半张量方法的非线性系统暂态稳定裕度指标推广应用于暂态电压稳定分析中。仿真算例分析表明:该方法可以有效地判定独立电力系统的暂态电压稳定,并给出较为准确的临界切除时间。Independent electric power systems having induction motors can experience voltage stability problems.A multi-motor,multi-generator power system model was used to analyze transient voltage stability.This model effectively eliminates the zero eigenvalue of the Jacobi matrix at the equilibrium point,while guaranteeing equivalence with the original system using a purely differential equation model.A method to differentiate transient voltage in stabilities from transient angle in stabilities was presented,which is used for engineering design.Finally,a transient angle stability margin index based on semi-tensor product was extended to the transient voltage stability problem.Simulations show that the analysis method can effectively evaluate the transient voltage stability of independent electric power systems and predict reasonably accurate critical clearing times.

关 键 词：独立电力系统 暂态电压稳定 主导不稳定平衡点(CUEP) 裕度指标 

分 类 号：TM71[电气工程—电力系统及自动化]