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当前位置: 首页 > 文章 > 水泵水轮机飞逸稳定性及其与反S特性曲线的关联 农业机械学报 2015,46 (4) 59-64
Position: Home > Articles > Runaway Stabilities of Pump-turbines and Its Correlations with S Characteristic Curves Transactions of the Chinese Society for Agricultural Machinery 2015,46 (4) 59-64

水泵水轮机飞逸稳定性及其与反S特性曲线的关联

作  者：
杨建东;曾威;杨威嘉;姚尚武;郭文成
单  位：
武汉大学水利水电学院;武汉大学水资源与水电工程国家重点实验室;乌普萨拉大学工程科学系
关键词：
水泵水轮机;反S特性;抽水蓄能电站;飞逸稳定性
摘  要：
抽水蓄能电站的安全稳定运行与水泵水轮机反S特性直接相关。在电站甩负荷工况下,时有发生调速器事故,导致水泵水轮机导叶拒动,使机组进入飞逸工况。而由于水泵水轮机的反S特性会使得机组参数不能像常规水轮机一样快速收敛,甚至出现振荡的现象,导致事故进一步扩大。针对布置有下游调压室的抽水蓄能电站,采用线性化处理方法获得了水泵水轮机反S特性曲线的传递函数,并建立了流道-水轮机-发电机耦合的常微分数学模型,并进一步推导了水泵水轮机飞逸工况稳定性的判别条件。结果表明飞逸振荡的现象由多种因素共同决定,其中水泵水轮机飞逸点的曲线斜率为关键因素。利用已建立的物理模型平台,对这些影响因素进行了分析,并验证了所得的理论分析结论。
译  名：
Runaway Stabilities of Pump-turbines and Its Correlations with S Characteristic Curves
作  者：
Yang Jiandong;Zeng Wei;Yang Weijia;Yao Shangwu;Guo Wencheng;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University;School of Water Resources and Hydropower Engineering,Wuhan University;Department of Engineering Sciences,Uppsala University;
关键词：
Pump-turbine S characteristics Pumped storage station Runaway stability
摘  要：
Pumped-storage stations can store energy and generate power according to load fluctuations,and play an important role as efficient and effective regulators in the electric grid.The safety and stability of pumped-storage station are directly related to S characteristics of pump-turbines.When pump-turbines reject their load,servomotor often fails with uncertain issues,thus leading to guide vane closing failure and the unit will go into runaway operations with high rotational speed.Pump-turbine S characteristics,however,will prevent unit parameters from converging to constants as normal Francis turbines,thus aggravating the accidents with some harmful oscillations.This phenomenon occurred in pumped-storage stations installed at the downstream surge tank was studied.The linearization method of pump-turbine characteristics was adopted to gain the transfer coefficients of pump turbines.Then,a coupling mathematic model composed of pump-turbines,conduits,surge tank and generators was established based on matrix method.It was used to deduce the stability criterion of runaway operations.It can be concluded that the runaway oscillation of pump-turbines was caused by a couple of factors,in which the slopes of characteristic curves at the runaway point were dominated.Model tests were conducted on a model pumped-storage station in the laboratory which is composed of nine sub-systems.The model data of runaway conditions of two different pump-turbines were gained,and the conclusions of the theoretical analyses were validated.

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