本文選題：水力過渡過程 + 導(dǎo)葉關(guān)閉規(guī)律　； 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：水輪機(jī)組過渡過程是決定水電站穩(wěn)定性的關(guān)鍵因素,關(guān)系到電站運(yùn)行的安全性和經(jīng)濟(jì)性,是水電站問題的研究熱點(diǎn)。調(diào)研發(fā)現(xiàn),在某些水流慣性時間常數(shù)較大的水電站,由于作用在導(dǎo)葉上的水力矩過大易導(dǎo)致甩負(fù)荷過程的導(dǎo)葉關(guān)閉規(guī)律與整定的導(dǎo)葉關(guān)閉規(guī)律相比出現(xiàn)了很大差異(如導(dǎo)葉關(guān)閉速度過快、停頓等),給電站的安全穩(wěn)定運(yùn)行帶來了威脅。本文以雅瑪渡水電站為例,對其甩負(fù)荷過渡過程中導(dǎo)葉關(guān)閉規(guī)律異常進(jìn)行了仿真計(jì)算,提出了兩種處理方案,并對比分析了其對過渡過程的影響。針對雅瑪渡水電站1#機(jī)組甩負(fù)荷時出現(xiàn)的導(dǎo)葉關(guān)閉過快和停頓現(xiàn)象進(jìn)行了定性分析,并建立了機(jī)組的隨動系統(tǒng)模型進(jìn)行了具體的定量分析,發(fā)現(xiàn)機(jī)組的導(dǎo)葉關(guān)閉異常現(xiàn)象出現(xiàn)在導(dǎo)葉第一段關(guān)閉的前期,主要是由于機(jī)組導(dǎo)葉所受的水力矩過大和接力器的操作力矩偏小造成的;提出增設(shè)單向節(jié)流閥和增大接力器直徑兩種改進(jìn)方案,并進(jìn)行仿真驗(yàn)證兩種方案均可有效解決機(jī)組甩負(fù)荷時出現(xiàn)的導(dǎo)葉關(guān)閉異�，F(xiàn)象。鑒于雅瑪渡電站機(jī)組已建造完成,采用增設(shè)單向節(jié)流閥方案,改進(jìn)后雅瑪渡電站運(yùn)行正常,甩負(fù)荷過程中不再出現(xiàn)關(guān)閉速度過快和停頓現(xiàn)象。最后,論文對正常、異常和兩種改進(jìn)方案進(jìn)行了仿真計(jì)算,對比分析了其對過渡過程的影響及影響規(guī)律。本文的研究成果不僅為雅瑪渡電站的技術(shù)改造提供直接的理論依據(jù),也對其它大水流慣性時間常數(shù)水電站的設(shè)計(jì)改造及過渡過程研究具有參考意義。
[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.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV738

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本文編號：1975348