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LOSS MINIMIZATION IN INDUCTION MOTOR ADJUSTABLE SPEED DRIVES

By ΙΟΡΔΑΝΗΣ ΚΙΟΣΚΕΡΙΔΗΣ

Abstract

THE SUBJECT OF THIS THESIS IS THE LOSS MINIMIZATION IN AC DRIVES WITH INDUCTIONMOTORS. UP TO NOW TWO LOSS MINIMIZATION METHODS ARE USED. THESE METHODS ARE BASED ON SEARCH CONTROLLER AND LOOK-UP TABLES. IN THIS THESIS A SIMPLE LOSS MODEL CONTROLLER, IS PROPOSED. THIS CONTROLLER FINDS THE OPTIMUM MAGNETIC FLUX. THE OPTIMUM FLUX IS DEPENDENT ON THE STATOR CURRENT AND THE SPEED (OR THIS REFERENCE). THE STATOR CURRENT CAN BE MEASURED EASILY. FOR THE CALCULATION OF THE OPTIMUM FLUX, THREE COEFFICIENTS ARE REQUIRED. THESE COEFFICIENTS ARE DEFINED EXPERIMENTALLY, SINCE THEY ARE DECOUPLED FROM THE SPEED. CONSEQUENTLY THE PROPOSED CONTROLLER IS INDEPENDENT FROM THE MACHINE'S PARAMETERS. THE SEARCH CONTROLLER ADJUSTS A CONTROL VARIABLE (FLUX, SLIP FREQUENCY) IN ORDER TO MINIMIZETHE CONTROLLED VARIABLE. IN THE LITERATURE, AS A CONTROLLED VARIABLE HAS BEENUSED THE DRIVE'S INPUT POWER. HERE IT IS PROPOSED A SEARCH CONTROLLER, WHICH MINIMIZES NOT THE INPUT POWER BUT THE INVERTER INPUT CURRENT (CURRENT AT DC-LINK) OR THE STATOR CURRENT. THE CONTROLLER IS MORE SENSITIVE TO THE STATOR CURRENT THAN TO INPUT POWER OR THE DC-LINK CURRENT. THIS CONDITION IS IMPORTANT FORTHE CONTROLLER, PARTICULARLY IN CASE OF HIGH EFFICIENT MOTORS, IN ORDER TO MINIMIZE THE CONTROLLED VARIABLE. THE ABILITY OF THE PROPOSED CONTROLLERS TO SAVE ENERGY IS CONFIRMED EXPERIMENTALLY. FOR THIS PURPOSE, A SCALAR CONTROLLEDDRIVE WITH A PWM VOLTAGE-FED INVERTER HAS BEEN CONSTRUCTED. (ABSTRACT TRUNCATED)

Topics: CONTROLLERS, Induction, LOSS MODEL, Losses, Minimization, MOTOR, Search, Αναζήτηση, Απώλειες, Ελαχιστοποίηση, ΕΛΕΓΚΤΕΣ, ΕΠΑΓΩΓΙΚΟΣ, ΚΙΝΗΤΗΡΑΣ, ΜΟΝΤΕΛΟ ΑΠΩΛΕΙΩΝ
Publisher: Aristotle University Of Thessaloniki (AUTH)
Year: 1994
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