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Design and Simulation of Pump Cleaning Function
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Thyristor-based three-phase induction machine softstarters are widely used for fixedspeedpump applications. Pump clogging is a common problem and causesundesirable pump downtime and unnecessary maintenance costs. This master thesisinvestigates the possibilities of implementing a pump cleaning function into asoftstarter that would prevent the pump clogging.The pump cleaning function requires pump operation in forward and reverse of shortduration. An algorithm that runs the motor at reverse half-speed has been proposed.The algorithm has been validated using a softstarter simulation model together with acentrifugal pump load model. Motor start using constant frequency causes additionalenergy dissipation in the motor. Therefore its thermal limits have been assessed bycomparing energy dissipation in a direct-on-line start and during the pump cleaningalgorithm operation.The validation results demonstrate that it is possible to implement a pump cleaningfunction into a softstarter applicable to different motors and pumps. The reverse halfspeedalgorithm introduces pulsating torque which might be beneficial for the pumpcleaning. A single pump cleaning sequence may produce additional motor energydissipation compared to nominal operation. Finding possible benefits, disadvantagesand limitations of pulsating torque and increased energy dissipation require futureinvestigation.

Place, publisher, year, edition, pages
2013. , 105 p.
EES Examensarbete / Master Thesis, XR-EE-E2C 2013:013
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-144411OAI: diva2:713375
Subject / course
Electrical Machines and Drives
Educational program
Master of Science - Electric Power Engineering
Seminarierummet, Teknikringen 33, Stockholm (English)
Available from: 2014-09-10 Created: 2014-04-22 Last updated: 2014-09-10Bibliographically approved

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