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Construction of an Active Rectifier for a Transverse-Flux Wave Power Generator
KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Wave power is an energy source which could make a decisive difference in thetransition towards a more sustainable energy sector. The growth of wave powerproduction has however not been as rapid as the growth in other renewableenergy fields, such as wind power and solar power. Some technical obstaclesremain before a major breakthrough for wave power can be expected. Oneobstacle so far has been the low voltages and the resulting high power lossesin many wave power plants. A new type of wave power generator, which hasbeen invented by Anders Hagnestål at KTH in Stockholm, aims to solve theseproblems. This master’s thesis deals with the power electronic converter systemfor Anders Hagnestål’s generator. It describes the planning and constructionprocess for a single-phase AC/DC converter, which will eventually be a partof the larger converter system for the generator. A control system based onhysteresis current control is planned and assembled. The finished single-phaseconverter shows agreeable results working as an inverter, generating a distinctlysinusoidal AC voltage. However, some additional construction and calibrationin the digital control system remain, before the converter can be used in thepower conversion for a wave power plant.

Abstract [sv]

Vågkraft är en energikälla som skulle kunna göra en avgörande skillnad i omställningenmot en hållbar energisektor. Tillväxten för vågkraft har dock intevarit lika snabb som tillväxten för andra förnybara energislag, såsom vindkraftoch solkraft. Vissa tekniska hinder kvarstår innan ett stort genombrott för vågkraftkan bli möjligt. Ett hinder fram tills nu har varit de låga spänningarna ochde resulterande höga effektförlusterna i många vågkraftverk. En ny typ av vågkraftsgenerator,som har tagits fram av Anders Hagnestål vid KTH i Stockholm,avser att lösa dessa problem. I det här examensarbetet behandlas det effektelektroniskaomvandlingssystemet för Anders Hagneståls generator. Det beskriverplanerings- och konstruktionsprocessen för en enfasig AC/DC-omvandlare, somså småningom skall bli en del av det större omvandlingssystemet för generatorn.Ett kontrollsystem för omvandlaren, baserat på hystereskontroll för strömmen,planeras och sätts ihop. Den färdiga enfasomvandlaren visar goda resultat underdrift som växelriktare. Dock kvarstår visst konstruktionsarbete och viss kalibreringav det digitala kontrollsystemet innan omvandlaren kan användas för sinuppgift i effektomvandlingen hos vågkraftverket.

Place, publisher, year, edition, pages
2017. , p. 95
Series
TRITA-EE, ISSN 1653-5146 ; 2017:114
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-215635OAI: oai:DiVA.org:kth-215635DiVA, id: diva2:1148533
Educational program
Master of Science - Electric Power Engineering
Available from: 2017-10-11 Created: 2017-10-11 Last updated: 2017-10-11Bibliographically approved

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