Geared PM wind generator and MPPT control for DC-grid wind energy system

Mdakane, Lethiwe Philile (2020-03)

Thesis (MEng)--Stellenbosch University, 2020.

Thesis

ENGLISH ABSTRACT: In this study a geared PM generator for small-scale DC-grid connected wind energy systems is considered. A commercial 2.2 kW PM generator is evaluated using FEA software and is used for practical system measurements. An alternative 4 kW PM generator that achieves a high torque density and low cogging torque is designed. A simple robust feedforward maximum power point tracking (MPPT) control method is proposed, which is attained through feedback gain-scheduling. A practical set-up of the system is built and practical measurements of the system are taken. It is found, from simulation, that the proposed MPPT control method that is derived is capable of having the system operating at its MPPT trajectory. The practical results show that the duty cycle of the DC-DC converter can be adjusted according to optimum values in order to control the system and have it operating at its MPPT.

AFRIKAANSE OPSOMMING: In hierdie studie word ’n geratte PM-generator vir kleinskaalse GS-netwerkverbinding windenergie-stelsels beskou. ’n Kommersiële 2.2 kW PM-generator word met behulp van FEA-sagteware geëvalueer en word gebruik vir praktiese stelselmetings. ’n Alternatiewe 4 kW PM-generator met ’n hoë draaimoment digtheid en ’n lae getande draaimoment, is ontwerp. ’n Eenvoudige robuuste vorentoevoer maksimum drywingspunt volging (MDPV) beheermetode word voorgestel, wat bereik word deur middel van terugvoer aanwinsskedulering. ’n Praktiese opstelling van die stelsel is gebou en praktiese metings van die stelsel is gedoen. Vanuit simulasie is gevind dat die voorgestelde MDPV-beheermetode wat afgelei is, die stelsel op sy MDP-baan kan laat werk. Die praktiese resultate wys dat die dienssiklus van die GS-GS-omsetter kan verstel word ooreenkomstig optimum waardes om sodoende die stelsel by MDP te beheer.

Please refer to this item in SUNScholar by using the following persistent URL: http://hdl.handle.net/10019.1/108010
This item appears in the following collections: