Publicaties
Gekozen filters:
Gekozen filters:
Evaluation of the MPPT performance in small wind turbines by estimating the tip-speed ratio Universiteit Gent
In this paper, a method for online estimation of the tip speed ratio (TSR) of small wind turbines is presented, in order to evaluate the MPPT performance. Unlike obvious methods, for which an encoder or resolver is needed, the presented method only requires measurements of the wind speed and the generator current. Firstly, the accuracy of the presented method is evaluated by using a wind turbine emulator. The obtained results show that the ...
Vibration based structural health monitoring of the substructures of five offshore wind turbines Vrije Universiteit Brussel
In 2011 a first vibration monitoring system was installed on a single Belgian offshore wind turbine to research the possibility to monitor the structural integrity of the wind turbines substructure using accelerometers. From 2011 to 2017 four more wind turbines have been equipped with a similar setup. A combined total of 15 years of vibration measurements on all five turbines has been collected. In this contribution we will focus how vibration ...
Virtual sensing techniques for response estimation and fatigue assessment of offshore wind turbines Vrije Universiteit Brussel
The foundations of offshore wind turbines (OWTs) will ultimately determine the lifetime of an offshore wind farm. With uncertainties in earlier designs and consequent design conservatism there is potential room for life-time extension of these foundations. To assess remaining useful life and support end-of-life decisions, one thus needs to adequately compare the design assumptions with the actual in-situ conditions. As fatigue life is an ...
Performance and structural load analysis of small and medium wind turbines operating with active speed stall control versus pitch control Universiteit Gent
The objective of this paper is to investigate the performance pitch and active speed stall control, and their impact on the structural loads of small and medium wind turbines (SMWTs). Large wind turbines use blade pitching to limit the power at high wind speeds. For SMWTs, the cost and complexity of a blade pitching system are not justified, so that passive yaw, stall control, or a furling tail mechanism is used instead. However, the choice of a ...
Fatigue assessment of offshore wind turbines on monopile foundations using multi-band modal expansion Vrije Universiteit Brussel
Offshore wind turbines (OWTs) are subjected to both quasi-static loads originating from variations in the thrust force and dynamic loads linked to turbulence, waves and turbine dynamics. Both types of loads contribute to fatigue life progression and thus define the turbine’s age. As a structural health monitoring solution, one could thus directly measure the stress history at fatigue critical locations. However, for OWTs on monopile foundations ...
Techno-economic optimisation of small wind turbines using co-design on a parametrised model Universiteit Gent
Modeling of active yaw systems for small and medium wind turbines Universiteit Gent
Condition Monitoring of Wind Turbines and Extraction of Healthy Training Data Using An Ensemble of Advanced Statistical Anomaly Detection Models Vrije Universiteit Brussel
Premature failures caused by excessive wear are responsible for a large fraction of the maintenance costs of wind turbines. Therefore, it is crucial to be able to identify the formation of these failures as early as possible. To this end, a novel condition monitoring method is proposed that uses univariate and multivariate statistical data analysis techniques to construct an anomaly detection framework based on temperature SCADA data from wind ...
MONITORING THE CONSUMED FATIGUE LIFE OF WIND TURBINES ON MONOPILE FOUNDATIONS Vrije Universiteit Brussel
Fatigue life is often a design driver for offshore wind turbines. A better understanding on the mech- anisms behind fatigue can improve design and thus reduce the initial cost of future substructures. This contribution aims to improve the understanding of fatigue life progression through monitoring. Mea- surements on an existing structure allow linking the fatigue life progression to different operational and environmental conditions, which can ...