尾水调压室位置对抽水蓄能电站过渡过程的影响
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摘要
尾水调压室位置的选择与优化是电站设计中影响调节保证计算的重要因素。基于特征线法针对调压室不同的位置分别建立了某抽水蓄能电站的输水系统和水轮机调节系统的水力-机械数值仿真模型,对由于位置变化带来的机组过渡过程进行敏感性分析。仿真结果表明:当尾水调压室位于岔管之前时,由于布置位置更靠近机组且每条支管都直接与调压室相连,对于相继甩负荷工况下尾水管真空度有较为明显的改善作用;不同大小的阻抗孔面积对于过渡过程计算也有相应的影响。通过调压室位置选择为机组过渡过程中尾水管真空度优化提供了研究思路和依据。
The selection of the optimized location of tail water surge chamber is an important factor influencing the calculation of regulation guarantee in the design of power station. Based on the characteristic line method,the hydraulic-mechanical numerical simulation models of a pumped storage power station ' s water delivery system and turbine ' s regulating system are established or different positions of the surge chamber,and the sensitivity of the unit transition process on the change of position is then analyzed. The simulation results show that when the tail water surge chamber is located before the bifurcation pipe,as it is closer to the unit and each branch pipe is directly connected to the pressure regulating chamber,it has a significant improvement on the vacuum level of the tail pipe under the condition of successive load rejection. The impedance hole area of different size also has a corresponding influence on the calculation of the transition process. This paper provides a research idea and theoretical basis for the vacuum degree optimization of tail water pipe during the unit transition by optimizing the position of the surge chamber.
The selection of the optimized location of tail water surge chamber is an important factor influencing the calculation of regulation guarantee in the design of power station. Based on the characteristic line method,the hydraulic-mechanical numerical simulation models of a pumped storage power station ' s water delivery system and turbine ' s regulating system are established or different positions of the surge chamber,and the sensitivity of the unit transition process on the change of position is then analyzed. The simulation results show that when the tail water surge chamber is located before the bifurcation pipe,as it is closer to the unit and each branch pipe is directly connected to the pressure regulating chamber,it has a significant improvement on the vacuum level of the tail pipe under the condition of successive load rejection. The impedance hole area of different size also has a corresponding influence on the calculation of the transition process. This paper provides a research idea and theoretical basis for the vacuum degree optimization of tail water pipe during the unit transition by optimizing the position of the surge chamber.
引文
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[14] Zeng W,Yang J,Hu J,et al. Guide-Vane Closing Schemes for Pump Turbines Based on Transient Characteristics in S-shaped Region[J].
[15]刘蓉,杨建东.抽水蓄能电站一洞两机相继甩负荷分析[J].水力发电学报,2017,(4):71-77.
[16]程永光,杨建东.实用水力瞬变过程[M]. 3版.北京:中国水利水电出版社,2015.
[17]邵年,刘惟.构皮滩水电站尾水调压室布置及结构优化设计[J].人民长江,2014,(S1):80-82.
[2]鲍海艳,付亮,杨建东.抽水蓄能水电站尾水调压室设置条件探讨[J].水力发电学报,2014,(1):95-101.
[3]杨建东,詹佳佳,鲍海艳.调压室位置对调保参数的影响[J].水动力学研究与进展A辑,2007,(2):162-167.
[4]鲍海艳,杨建东,付亮.尾水调压室位置对尾水管最小压力值的影响[J].水力发电学报,2007,26(6):77-82.
[5]程永光,刘晓峰,杨建东.大型尾水调压室底部交汇型式CFD分析与优化[J].水力发电学报,2007,(5):68-74.
[6]廖翔,余波,张术彬,等.双机共用尾水调压室阻力系数试验研究[J].人民长江,2017,(1):80-83.
[7]刘甲春,张健,俞晓东.双机共尾水溢流式调压室过渡过程研究[J].人民长江,2016,(10):72-75.
[8]俞晓东,张健,陈胜.尾水采用室后交汇布置的水电站过渡过程研究[J].水力发电学报,2014,(6):142-148.
[9]俞晓东,张健,苗帝,等.尾水岔管在调压室后交汇的水电站小波动稳定分析[J].水利学报,2014,(4):458-466.
[10]张新春,杨建东,郭文成,等.抽水蓄能电站尾水系统布置对相继甩负荷工况尾水管进口最小压力的影响[J].大电机技术,2014,(3):57-61.
[11]张健,卢伟华,范波芹,等.输水系统布置对抽水蓄能电站相继甩负荷水力过渡过程影响[J].水力发电学报,2008,(5):158-162.
[12]陈胜,张健,俞晓东.水电站输水系统相继甩负荷下调压室涌浪叠加研究[J].水利学报,2015,(11):1 321-1 328.
[13]孙丽君,李海涛.特殊工况下抽水蓄能电站系统参数过渡过程分析[J].人民长江,2016,(19):102-105.
[14] Zeng W,Yang J,Hu J,et al. Guide-Vane Closing Schemes for Pump Turbines Based on Transient Characteristics in S-shaped Region[J].
[15]刘蓉,杨建东.抽水蓄能电站一洞两机相继甩负荷分析[J].水力发电学报,2017,(4):71-77.
[16]程永光,杨建东.实用水力瞬变过程[M]. 3版.北京:中国水利水电出版社,2015.
[17]邵年,刘惟.构皮滩水电站尾水调压室布置及结构优化设计[J].人民长江,2014,(S1):80-82.