A professional bachelor project report from Aalborg University
Trykregulering af MQ3-45 pumpe for mindre bygninger: Regulering
Forfatter(e)
Semester
7. semester
Uddannelse
Udgivelsesår
2013
Afleveret
2013-08-06
Antal sider
61 pages
Abstract
Grundfos wants to supply their MQ-3 pump with a frequency converter, which will release its rotor speed from the grid frequency. This makes it possible to control the angular velocity of the rotor and hence makes it possible to provide a constant pressure. To analyze how the improved MQ-3 pump "Squba" must be controlled so it delivers a constant pressure, a prototype model of Squba is developed in Matlab Simulink. The model is set up with Affinity and ideal gas equations; the model is afterwards verified with experimental data from the lab. Afterward the model is converted into the real Squba model by providing it with real Squba pump data from Grundfos. To determine the volume of the pressure tank there is carried out a series of analysis for the system's four-parameters (flow, volume, pre-charge and reference pressure). After which they are used to calculate the pressure tanks volume and pre-charge level. Subsequently, the nonlinear model is linearized and block reduced, in order to obtain the transfer function of Squba so the technical tools for regulation could be used to design a controller. In addition, the stability of the system is analyzed, to determine the linearization point of Squba transfer function. The non-linear pump model and the transfer function in linearization point match sufficiently, so the transfer function can be considered to be verified. Then there is designed a PI controller, using the Root Locus method, as the P alone couldn’t fulfill the task. Finally the PI controller is implemented in the non-linear pump model, where the assessed that the controller does not fulfill the task.
Kolofon: Denne side er en del af AAU Studenterprojekter — Aalborg Universitets studenterprojektportal. Her kan du finde og downloade offentligt tilgængelige kandidatspecialer og masterprojekter fra hele universitetet fra 2008 og frem. Studenterprojekter fra før 2008 kan findes i trykt form på Aalborg Universitetsbibliotek.
Har du spørgsmål til AAU Studenterprojekter eller Aalborg Universitets forskningsregistrering, formidling og analyse, er du altid velkommen til at kontakte VBN-teamet. Du kan også læse mere i AAU Studenterprojekter FAQ.