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| Experiment for effect of frequency converter harmonic on speed regulating pump unit efficiency |
| Tang Lingdi, Yuan Shouqi, Tang Yue, Gu Zhe, Wang Hui |
| National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract Frequency control technology is an effective way in energy-saving for pump unit. In order to obtain the effect of frequency converter harmonic on the efficiency of speed regulating pump unit, the experimental setup was designed based on the analysis of harmonic generation mechanism and the influence of harmonic on pump unit. It was an open test apparatus and included a high frequency electrical parameter measuring instrument with filtering function, a virtual instrument, etc. In this test apparatus, research object was a typical self-sucking centrifugal pump, the high-frequency electrical parameter measuring instrument was connected to the output of the inverter, and the torque-speed sensor was connected between the motor output shaft and the self-sucking centrifugal pump. Before and after filtering, hydraulic performance parameters and electrical parameters of the self-sucking centrifugal pump unit were collected, the efficiency of the pump unit was calculated and analyzed through changing the output frequency of frequency converter can regulate the self-sucking centrifugal pump rotating speed. The results show that the self-sucking centrifugal pump unit efficiency can be improved by 1% to 3% and the motor efficiency can be increased by 3% to 9% under the condition of suppressing the frequency converter output harmonic. Moreover, the lower the frequency is, the more obvious the efficiencies of both the motor and the unit are increased in the frequency range of from 20 Hz to 50 Hz. Quantitative research on the effect of frequency converter harmonic on performance of speed regulating pump unit can contribute to the speed range selection.
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Received: 23 June 2014
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