文章摘要
刘冬,张辉,任刚,丁萁琦,陈上,肖志怀.特征线法及其变体在水轮机及引水系统非线性建模中的对比研究[J].水利学报,2020,51(4):448-457
特征线法及其变体在水轮机及引水系统非线性建模中的对比研究
Comparative study of characteristic line method and its variants in nonlinear modeling of hydraulic turbine and water diversion system
投稿时间:2019-08-21  
DOI:10.13243/j.cnki.slxb.20190596
中文关键词: 特征线法  重采样  引水系统  非恒定摩阻
英文关键词: characteristic line method  resampling  water diversion system  unsteady friction
基金项目:国家自然科学基金项目(51979204,51379160)
作者单位E-mail
刘冬 武汉大学 动力与机械学院, 湖北 武汉 430072
武汉大学 水力机械过渡过程教育部重点实验室, 湖北 武汉 430072 
 
张辉 中国长江电力股份有限公司 溪洛渡水力发电厂, 云南 永善 657300  
任刚 中国长江电力股份有限公司 溪洛渡水力发电厂, 云南 永善 657300  
丁萁琦 中国长江电力股份有限公司 溪洛渡水力发电厂, 云南 永善 657300  
陈上 武汉大学 动力与机械学院, 湖北 武汉 430072
武汉大学 水力机械过渡过程教育部重点实验室, 湖北 武汉 430072 
 
肖志怀 武汉大学 动力与机械学院, 湖北 武汉 430072
武汉大学 水力机械过渡过程教育部重点实验室, 湖北 武汉 430072 
xiaozhihuai@126.com 
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中文摘要:
      建立引水系统的水力变化模型是水电机组非线性建模和仿真中的重要内容,同时水力因素对水轮机调节系统过渡过程的影响也是研究机组和电网稳定性时需要系统性考虑的主要问题。本文提出了一种改进的特征线法,针对水轮机及引水系统建立了包含基本特征线法的联合非线性模型,以及包含可选水击模型的模块化非线性模型,以开展特征线法及其变体的对比研究,为今后水轮机调节系统的大小波动仿真提供一定的理论指导。在此基础上,以国内某大型水电站机组孤网运行模式为例,在频率和负载的大、小扰动作用下,研究了刚性和弹性水击、特征线法及其变体模型的仿真结果,分析了各模型计算的瞬时水头的差别,得出了不同模型参数的调节规律和影响效果。结果表明,在大小波动条件下不同引水系统模型对于机组水头变化趋势的描述基本一致,仅在局部极值附近的计算结果有所差别,且在大波动条件下较为明显,但可通过调整具体的模型参数减小这种差别。
英文摘要:
      Establishment of hydraulic variation model for water diversion system is an important content in the nonlinear modeling and simulation of hydropower units, and the influence of hydraulic factors on the transition process of hydro-turbine regulating system (HTRS) is also the main problem to be considered systematically for the stability analysis of units and power systems. In this paper, an improved characteristic line method is proposed, and a combined nonlinear model including the basic characteristic line method and a modular nonlinear model including optional water hammer models are developed for hydro-turbine and water diversion system to conduct the comparative study for characteristic line method and its variations, so as to provide some theoretical guidance for the simulation of large and small fluctuation of hydro-turbine regulating system in the future. On this basis,taking the isolated grid operation of a large hydropower station in China as an example, under the large and small disturbances of frequency and load, the simulation of rigid and elastic water hammer,characteristic line method and its variant model is studied, the difference of instantaneous water head calculated by each model is analyzed, and the regulation rules and influence effects of different model parameters are obtained. The results show that the description of the variation trend of water head by different models of water diversion system is basically the same under the condition of large and small fluctuations,and the calculation results are only different near the local extremes,which is more obvious under the condition of large fluctuations. However,this difference can be reduced by adjusting specific model parameters.
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