| 变频调速灯泡贯流泵站的起动过渡过程 |
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| 引用本文： | 张仁田,李慈祥,姚林碧,朱红耕.变频调速灯泡贯流泵站的起动过渡过程[J].排灌机械,2012(1):46-52. |
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| 作者姓名： | 张仁田 李慈祥 姚林碧 朱红耕 |
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| 作者单位： | [1]扬州大学水利科学与工程学院,江苏扬州225009 [2]江苏省水利勘测设计研究院有限公司,江苏扬州225009 [3]南京市水利规划设计院有限责任公司,江苏南京210006 |
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| 基金项目： | 基金项目：“十一五”国家科技支撑计划重大项目（2006BAB04A03）;江苏省水利科技项目（2010023）;江苏省水利动力工程重点实验室开放课题（K100016） |
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| 摘 要： | 为了获得变频调速灯泡贯流泵站的起动过渡过程水力特性,分析了变频调速贯流泵机组起动时采用矢量控制变频装置、低速同步起动的基本特点,建立了同步起动的灯泡贯流泵机组过渡过程力矩动态平衡方程;研究了同步电动机电磁转矩随转速变化的数学表达方法,分析了灯泡贯流泵机组阻力矩由水阻力矩、轴承摩擦力矩、电动机风扇阻力矩和转子风阻力矩等构成,并给出了相应的数学表达式,提出了快速闸门及其分流拍门在开启过程中的流量分配与平衡方程式.以南水北调东线工程中淮阴三站为案例,对设计工况下起动过程中的主要电气参量和水力参数进行仿真模拟,起动瞬间的励磁电流达到设计值的0.63倍,当频率为6.5 Hz时机组开始转动,迟滞时间为15 s,从而得到了频率变化规律与快速闸门延迟开启时间的最佳匹配.在设计工况下,当同步电动机转速线性变化从0到125 r/min的历时为100 s时,快速闸门延迟开启的最佳时刻为70 s.
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| 关 键 词： | 灯泡贯流泵站 变频调速 同步电动机 起动过渡过程 数值模拟 |
Startup transient behavior of bulb pump unit with VFD |
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| Zhang Rentian,Li Cixiang,Yao Linbi,Zhu Honggeng.Startup transient behavior of bulb pump unit with VFD[J].Drainage and Irrigation Machinery,2012(1):46-52. |
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| Authors: | Zhang Rentian Li Cixiang Yao Linbi Zhu Honggeng |
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| Institution: | 1. College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China; 2. Jiangsu Surveying ＆ De- sign Institute of Water Resources Co. Ltd. , Yangzhou, Jiangsu 225009, China; 3. Nanjing Water Planning ＆ Designing Institute, Ltd., Nanjing, Jiangsu 210006, China) |
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| Abstract: | In order to obtain the transient hydraulic characteristics of the bulb pump unit in a pump station with VFD during startup,the essential features of low-speed synchronous startup controlled by VFD were analyzed initially.Then the moment equilibrium equation of the rotor of pump unit was established in the startup transient period.The mathematically expressing approach for the electroma-gnetic torque in the synchronous motor in terms of time was investigated.The resistance moments,inclusive of hydraulic resistance moment,bearing frictional moment and motor cooling fan resistance moment etc,and their mathematical expressions were clarified.Finally,the flow rate allocation and conservation between the rapid-drop gate and flap valve during the transient period were determined.Taking Huaiyin No.3 Pumping Station as a study case,the startup transient process of the pump unit under the design condition was simulated to obtain the primary electrical and hydraulic parameters.In the simulation,the pump started running when the instant exciting current reached 0.63 times its design value and the frequency was about 6.5 Hz,causing a 15 s lag delay.As a result,a best match was obtained between the motor rotational speed frequency and the lag time for opening the rapid-drop gate.At the design condition,when the rotational speed of the synchronous motor is linearly increased from 0 to 125 r/min in 100 s interval,the optimal lag time is 70 s for opening the rapid-drop gate. |
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| Keywords: | bulb pump variable frequency drive synchronous motor startup transient process numerical simulation |
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