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Modelling and control of direct drive variable speed wind turbine with Interior Permanent Magnet Synchronous Generator

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Chowdhury, MM (2014) Modelling and control of direct drive variable speed wind turbine with Interior Permanent Magnet Synchronous Generator. PhD thesis, University of Tasmania.

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Abstract

The interest in wind energy system is growing worldwide to reduce dependency on
fossil fuel and to minimize the adverse impact of climate change. Currently, doubly fed
induction generator (DFIG) based variable speed wind turbine technology with gearbox
is dominating the world market share. However, the problems associated with induction
generator based wind turbines are reactive power consumption, mechanical stress and
poor power quality. Moreover, the gearbox requires regular maintenance as it suffers
from faults and malfunctions. Therefore, it is important to adopt technologies that can
enhance efficiency, reliability and reduce system cost of wind based power generation
system. The performance of a variable speed wind turbine can be enhanced significantly
by using a low speed permanent magnet synchronous generator (PMSG) without a
gearbox. The main features of PMSG based wind turbines are; gearless operation,
higher efficiency, enhanced reliability, smaller size, reduced cost and low losses. The
main aim of this thesis is to develop improved control strategies for an efficient and
reliable grid interface system for a gearless, direct drive variable speed wind turbine.
This thesis focuses on several aspects of modelling and control of interior permanent
magnet (IPM) synchronous generator based grid connected variable speed wind turbine
with maximum power extraction (MPE). Both the indirect and direct control strategies
are addressed for IPM synchronous generator based variable speed wind turbines. The
main contributions of this thesis are; (i) development of parameter measurement
methods to determine the parameter of an IPM synchronous generator, (ii) development
of an improved indirect vector control scheme for the IPM synchronous generator based
direct drive variable speed wind turbine, incorporating maximum torque per ampere
trajectory (MTPA) and maximum power extraction (MPE) algorithm (iii) development
of direct torque and flux (DTFC) control scheme for the IPM synchronous generator
based direct drive variable speed wind turbine, and (iv) development of control and
power management strategy for a three level converter based STATCOM with Supercapacitor
energy storage to enhance the performance of the proposed wind energy
conversion system under various disturbances.

Item Type: Thesis (PhD)
Keywords: Wind turbine, Permanent Magnet Synchronous Generator, Power control, Energy storage, Low voltage fault ride through, STStCOM, Direct Drive Variable Speed
Copyright Holders: Copyright the Author
Copyright Information:

Copyright 2014 the Author

Date Deposited: 03 Jun 2015 02:28
Last Modified: 15 Sep 2017 01:06
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