Optimization and Modeling of Transient of a Parallel Multiple Variable-Speed Water Pump System
Authors
Gjerlevsen, Allan ; Kulsinskas, Andrius
Term
4. Term
Publication year
2019
Submitted on
2019-05-31
Pages
75
Abstract
Dette projekt har til formål at gøre vandpumpesystemer med flere pumper mere energieffektive. Mange anlæg mangler egnede optimeringsalgoritmer, hvilket fører til højere energiforbrug, større miljøbelastning og vandtab. Tre metoder undersøges som mulige løsninger. (1) En tidligere effektiviseringsalgoritme, der gav fejlbehæftede resultater, genimplementeres med forbedrede beregninger og data og testes på en virkelig pumpestand. Under arbejdet identificeres over- og undertryk under driftsovergange som en medvirkende årsag til problemet. Der indsamles forsøgsdata, som viser, hvordan systemets output ændrer sig over tid, når driftsbetingelserne varierer (hvilke pumper er i drift, inputhastighed og kvælerventilens åbning). (2) Med afsæt i lignende arbejde udvikles en afkoblingsmetode, der skal mindske kobling mellem pumpernes tryk og reducere spidser i tryk/løftehøjde under overgange. (3) Der konstrueres en ny model fra bunden, hvor hver pumpes ydeevne beskrives som en sum af to overføringsfunktioner (en matematisk beskrivelse af, hvordan input bliver til output). De to sidstnævnte metoder evalueres i offline-simuleringer. De observerede resultater vurderes, og der drages en konklusion.
This project aims to make multi-pump water systems run more efficiently. Many installations lack suitable optimization algorithms, leading to higher power use, environmental impact, and water loss. Three methods are explored as potential solutions. (1) A previously developed efficiency optimization algorithm that produced faulty results is rebuilt with improved calculations and data and tested on a real pump platform. During the work, over- and under-pressuring during operating transitions is identified as a contributor to the problem. Experimental data are collected to show how the system’s outputs change over time as operating conditions vary (which pumps are active, input speed, and choke-valve opening). (2) Based on similar work, a decoupling method is designed to lessen the interaction between pump pressures and to reduce spikes in pressure/head during transitions. (3) A new model is created from scratch, representing each pump’s performance as a sum of two transfer functions (a mathematical way to relate inputs to outputs). The latter two methods are evaluated in offline simulations. The observed results are assessed, and conclusions are drawn.
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