Wavestar Generator
Author
Incau, Bogdan Ioan
Term
4. term
Education
Publication year
2013
Submitted on
2013-05-30
Pages
65
Abstract
Et Wavestar-system udvinder elektricitet fra havbølger. Denne afhandling fokuserer på en mekanisk transmission frem for hydrauliske eller trykbaserede løsninger: en flyder bevæger sig med bølgerne, en gearkasse driver en permanentmagnet-synkrongenerator, og en effektelektronisk omformer leverer strømmen. Hovedformålet er at designe og afprøve en styring, der kan håndtere de frem-og-tilbage, sinusformede variationer i moment og hastighed, som bølger giver. En Permanent Magnet Synchronous Generator styret med feltorienteret styring (FOC) står for energiomdannelsen og bygger på flyderteknologi fra tidligere Wavestar-projekter. Systemet er modelleret, og styringen er designet til sinusformet belastningsmoment og hastighedsreference, hvilket er mere komplekst end standard hastighedsstyring. En simulationsmodel er opbygget i Matlab/Simulink. For at validere den blev der lavet en laboratorieopstilling, hvor en asynkronmotor efterlignede bølgerne og var koblet til en PMSM; begge maskiner blev styret via dSpace ControlDesk. Forsøgene var begrænset til 500 o/min på grund af den bølgeemulerende motors effekt på 2,2 kW. Den gennemsnitlige udtagne effekt var 0,8 kW, sammenlignet med 1,2 kW i simuleringerne. Målinger af moment, hastighed og effekt viser, at den foreslåede styring fungerer inden for de testede grænser, og konklusionerne bygger på analysen og forsøgene.
A Wavestar system harvests electricity from ocean waves. This thesis focuses on a mechanical transmission instead of hydraulic or pressure-based solutions: a buoy (float) moves with the waves, a gearbox drives a permanent-magnet generator, and a power converter delivers electricity. The main aim is to design and test a controller that can handle the back-and-forth, sinusoidal torque and speed caused by waves. A Permanent Magnet Synchronous Generator controlled by Field-Oriented Control (FOC) performs the energy conversion, using float technology developed in earlier Wavestar projects. The system was modeled and the controller was designed for sinusoidal load torque and speed references, which is more complex than standard constant-speed control. A simulation model was built in Matlab/Simulink. To validate it, a laboratory setup used an Induction Motor to emulate the wave motion, coupled to a PMSM, with both machines managed through a dSpace ControlDesk interface. Tests were limited to 500 rpm because the emulating motor is rated 2.2 kW. The average electrical power extracted was 0.8 kW, compared with 1.2 kW in simulation. Measurements of torque, speed, and power show the proposed control strategy working within the tested limits, and conclusions are based on the analysis and experiments.
[This abstract was generated with the help of AI]
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