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DTU Vind 2016
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annual report 2016 24 education name: gilmar ferreira pereira nationality: portuguese
project
title: reliabilities of composite materials for
wind
turbine blades supervision: lars pilgaard mikkelsen abstract: in order to compete with other less ?green? sources of energy the cost to produce
wind
made electricity needs to be reduced. one way to achieve this is by improving the re- liability of
wind
turbine components and optimising operation and maintenance strat- egies. this phd
project
is part of the european re- search
project
marewint, where the main ob- jective is to develop an innovative approach for coupled multi physics co-simulation, testing, design and optimisation of offshore
wind
turbines. the marewint main scientific objective is to optimise the design of off- shore
wind
turbines, maximise reliability, and minimise maintenance costs. integrated within the innovative rotor blades work-package, this phd
project
is focused on damage analysis and structural health monitoring of
wind
turbine blades. the work presented sets the required frame- work to develop a monitoring system based on fibre bragg gratings (fbg), which can be applied to the different life stages of a
wind
turbine blade. in this concept, the different measured physical parameters are used to improve the design process, and the imple- mented sensor are used to control the man- ufacturing and operation stage of a
wind
turbine rotor blade. name: kaushik das nationality: indian
project
title: integration of
wind
power
and other renewables in
power
system defence plans supervision: poul ejnar sommer sørensen abstract: increasing levels of penetration of
wind
power
and other renewable generations in european
power
systems pose challenges to
power
system security. the
power
system operators are continuously challenged es- pecially when generations from renewables are high thereby reducing online capacity of conventional controllable generations to minimum. in such operation hours, the sys- tem is typically more vulnerable to distur- bances in general and major disturbances in particular. the aim of this study is to investigate how renewable generations like
wind
power
can contribute to the
power
system defence plans. this phd
project
develops a new methodology to analyse the adequacy of re- serves for future
power
systems with high penetration of
wind
power
generation. this methodology assesses the requirements of frequency restoration reserves in order to contain the
power
imbalance caused by fore- cast errors within the designed frequency containment reserves. this work has been done as a part of eu-fp7 itesla
project
. name: henrik alsing friberg nationality: danish
project
title: combinatorial optimization over second-order and industrial applications supervision: jesper mathias stolpe abstract: mixed-integer second-order cone optimiza- tion is a
power
ful mathematical framework capable of representing both logical condi- tions and nonlinear relationships in math- ematical models of industrial optimization problems. solution methods are already part of many major commercial solvers including that of mosek [73] as well as xpress [31], gurobi [46] and cplex [50]. this thesis concerns the performance and reliability of these solvers and makes two contributions; a theoretical one and a practical one. in the theoretical part of the thesis a funda- mental issue with reliability, affecting both continuous and mixed-integer conic optimi- zation in general, is discovered and treated. an important distinction to make between continuous and mixed-integer optimiza- tion, is that the reliability issues occurring in mixed-integer optimization cannot be blamed on the practitioner?s formulation of the problem. finally, a branch-and-bound method utilizing these mechanisms is es- tablished. in the practical part of the thesis, a lack of consensus regarding basic defini- tions, representations and file formats is found, thereby increasing barriers for bench- marking with decreased market transparen- cy as result.
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