基于变频调速在泵站控制系统中应用的研究

字数:10697,页数:24  电气自动化论文编号:ZD112  

                            
目录
1 引 言 1
2 绪论 2
2.1 本论文背景与意义 2
2.2 变频调速概述 2
2.3 变频调速技术的发展及现状 2
2.4 泵站控制系统地位、作用 3
3 变频调速技术 4
3.1 变频调速的基本理论 4
3.2 变频调速对异步电机机械特性的影响 4
4 变频调速的节能方法及原理 8
4.1 “恒压变量”调节及其节能原理 8
4.2 “恒量变压”调节及其节能原理 10
5 变频调速技术在水泵中的节能原理 12
5.1 曲线拟合的最小二乘法 12
5.2 水泵的性能曲线 12
5.3 水泵的相似定律 13
5.4 水泵运行的工作点 14
5.5 变频调速在水泵上的节能特点 15
6 影响水泵变频调速节能效果的因素探讨 16
6.1 水泵单位能耗分析 16
6.2 富余扬程对节能效果的影响 16
6.2.1 管路特性的影响： 16
6.2.2　调速方式的影响 17
6.3 效率偏差对节能效果的影响 17
7 总结 19
致  谢 19
参考文献 20

【摘要】：随着社会经济的飞速发展，城市建设规模的不断扩大，人口的增多以及人们生活水平的不断提高，对城市供水的数量、质量、稳定性提出了越来越高的要求。变频调速装置具有节能、维护工作量小自动控制性能好等优点，得到广泛应用。文中对变频调速系统的工作原理做了简单的介绍，从理论上分析了变频调速系统的机械特性。通过对水泵节能原理的分析指出水泵调节运行时能量损耗的大小较大程度取决于控制流量的方式；结合对几种常见调速方法性能的比较，归纳了水泵采用变频调速的优点；通过计算证明在大型泵站和耗电量大且装置扬程变化较大的泵站采用变频调速节能效果显著。

【关键词】：泵；节能；变频调速

Abstract: With the progress development of social economic and the construct scale of city continuously enlarge, increasing of population and standard of living of people continuously improved, more and more demanding to quantity, quality and stability of water supply bring forward in city. With these advantages of energy-saving, low maintenance and easy automatic control ,variable-frequency speed regulation technology has been widely used. After the introduction of the principles of variable-frequency drive technology, the thesis analyzed mechanical characteristics. According to the analysis of pump energy saving, during the pump verified velocity, the quantity of energy waste lie on the type of flow control, and combined with several regular methods comparison, the advantage of variation velocity is concluded. Has calculated that in large-scale pumping stations and power installations and major changes in the larger lift pumping station using energy-saving effect of VVVF significantly

Key words: Pump; Energy saving; Variation velocity