电网技术2017，Vol.41Issue(8)：2499-2505,7.DOI:10.13335/j.1000-3673.pst.2016.3230
电力系统功角失稳与局部感应电动机失稳相互影响机理分析
Study on Mechanism of Interrelationship Between Power System Angle Stability and Induction Motor Stability
摘要
Abstract
Induction motor load accounts for a high proportion of power system load, whose dynamic response directly affects system stability characteristics. Voltage instability will lead induction motor blocked to lose stability, so induction motor instability is equivalent to transient voltage instability in some views. Through theoretical analysis in this paper, it is found out that voltage instability is not unique factor to cause induction motor instability; generator group's power-angle oscillation during transient process also has a great influence. After power system disturbance, unbalanced transient energy is absorbed by the system in process of generator group's power-angle oscillation. Generator group's power-angle swing-off reduces Thevenin's equivalent electric potential of the power system, directly affecting induction motor electromagnetic torque, and possibly causing its speed instability. At last, accuracy of the theoretical research in this paper is verified with an actual power grid example case. Therefore, operators are supposed to have comprehensive command of power source location, grid structure and load characteristics, so as to prejudge potential risks and prepare corresponding countermeasures to assure safety and stability in power system operation.关键词
电力系统/感应电动机/功角稳定/紧急控制Key words
power system/induction motor/angle stability/emergency control分类
信息技术与安全科学引用本文复制引用
顾卓远,汤涌,易俊,于强,沈政委,王一哲,李英彪..电力系统功角失稳与局部感应电动机失稳相互影响机理分析[J].电网技术,2017,41(8):2499-2505,7.基金项目
国家重点研发计划智能电网技术与装备重点专项(2016YFB0900600) （2016YFB0900600）
国家电网公司科技项目(SGTYHT15-JS-191).Key Project of Smart Grid Technology and Equipment of National Key Research and Development Plan of China (2016YFB0900600) （SGTYHT15-JS-191）
Science and Technology Research Foundation of SGCC (SGTYHT15-JS-191). （SGTYHT15-JS-191）
