雅玛渡水电站过渡过程异常现象分析与处理

发布时间：2018-06-04 02:09

本文选题：水力过渡过程 + 导叶关闭规律　；参考：《西安理工大学》2017年硕士论文

【摘要】：水轮机组过渡过程是决定水电站稳定性的关键因素,关系到电站运行的安全性和经济性,是水电站问题的研究热点。调研发现,在某些水流惯性时间常数较大的水电站,由于作用在导叶上的水力矩过大易导致甩负荷过程的导叶关闭规律与整定的导叶关闭规律相比出现了很大差异(如导叶关闭速度过快、停顿等),给电站的安全稳定运行带来了威胁。本文以雅玛渡水电站为例,对其甩负荷过渡过程中导叶关闭规律异常进行了仿真计算,提出了两种处理方案,并对比分析了其对过渡过程的影响。针对雅玛渡水电站1#机组甩负荷时出现的导叶关闭过快和停顿现象进行了定性分析,并建立了机组的随动系统模型进行了具体的定量分析,发现机组的导叶关闭异常现象出现在导叶第一段关闭的前期,主要是由于机组导叶所受的水力矩过大和接力器的操作力矩偏小造成的;提出增设单向节流阀和增大接力器直径两种改进方案,并进行仿真验证两种方案均可有效解决机组甩负荷时出现的导叶关闭异常现象。鉴于雅玛渡电站机组已建造完成,采用增设单向节流阀方案,改进后雅玛渡电站运行正常,甩负荷过程中不再出现关闭速度过快和停顿现象。最后,论文对正常、异常和两种改进方案进行了仿真计算,对比分析了其对过渡过程的影响及影响规律。本文的研究成果不仅为雅玛渡电站的技术改造提供直接的理论依据,也对其它大水流惯性时间常数水电站的设计改造及过渡过程研究具有参考意义。
[Abstract]:The transient process of hydraulic turbine unit is the key factor to determine the stability of hydropower station, which is related to the safety and economy of power station operation, and is the research hotspot of hydropower station. The investigation found that in some hydropower stations with large inertial time constants of water flow, Because the water torque acting on the guide vane is too large, there is a great difference between the guide vane closing law of load rejection process and the setting guide vane closing law (such as too fast closing speed of the guide vane). The pause and so on has brought the threat to the safe and stable operation of the power station. Taking Yarmadu Hydropower Station as an example, this paper simulates and calculates the abnormal rule of guide vane closure in the process of load rejection transition, puts forward two treatment schemes, and compares and analyzes its influence on the transition process. Based on the qualitative analysis of the phenomenon that the guide vane shuts too fast and pauses during the load rejection of the 1# unit of Yarmadu Hydropower Station, the model of the following system of the unit is established and the concrete quantitative analysis is carried out. It is found that the abnormal phenomenon of the guide vane closure occurs in the early stage of the first stage of the guide vane closure, mainly due to the excessive water torque of the guide vane of the unit and the small operating torque of the relay. Two improved schemes of adding unidirectional throttle valve and increasing the diameter of relay are put forward, and the simulation results show that the two schemes can effectively solve the abnormal phenomenon of guide vane closing when the unit is shedding load. In view of the completion of the construction of the Yarmadu power station, the scheme of adding one way throttle valve is adopted, the operation of the Yamato power station is normal after the improvement, and there is no longer the phenomenon of too fast closing and stopping in the process of load rejection. At last, the paper simulates the normal, abnormal and improved schemes, and analyzes their influence on the transition process. The research results in this paper not only provide a direct theoretical basis for the technical transformation of Yamadu Hydropower Station, but also have a reference significance for the design and transformation of other large water flow inertial time constant hydropower stations and the study of the transition process.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV738

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