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| Adaptability research of optimal operation mode with variable frequency drives for pumping stations in China′s Eastern RouteProject of S-to-N Water Diversion |
| Cheng Jilin1, Zhang Rentian1,2 , Deng Dongsheng3, Gong Yi1, Feng Xusong3 |
| （1.College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China; 2.Jiangsu Surveying and Design Institute of Water Resources Co. Ltd.， Yangzhou, Jiangsu 225009, China; 3.Jiangsu Water Source Co. Ltd. of the Eastern Route of S-to-N Water Diversion, Nanjing, Jiangsu 210029, China) |
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Abstract Taking the No.4 Jiangdu Pumping Station in China′s Eastern Route Project of S-to-N Water Diversion Project as a study case, mathematics models and solution methods were systematically proposed for optimal operation of single pump unit within a pumping station through blade adjusting regulation and variable speed regulation with variable frequency drives. Following results were achieved: (a) Better benefits can be obtained by optimization of blade adjusting operation compared with optimal variable speed operation by means of variable frequency drive under the conditions of the daily average pumping heads yearly varies from 3.8 m to 7.8 m and daily mean tidal range 1.2 m affected by Yangtze River tide no matter whether the peak valley electricity price is considered. (b)The optimal variable speed operation by means of variable frequency drive is better than optimization of blade adjusting operation only while the daily average pumping head is below 5.0 m and the pump is not with the total water amount. (c)While comparing with that of fixed blade angle and constant speed, the benefits brought about by optimization of variable speed operation cannot compensate the energy consumption of variable frequency drive with the total water amount. Meanwhile, according to the mechanism of pump system, the argument is proved that better benefits of large scale pumping station can be obtained by optimization of variable speed operation by means of variable frequency drive only while the pumping heads in a water transfer process has a large variation, which could provide theoretical basis for the renovation and optimal operation of large scale pumping station in Eastern Route Project of S-to-N Water Diversion Project.
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Received: 12 March 2010
Published: 30 September 2010
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