@phdthesis{patel_design_2019,
  howpublished = {Student Thesis},
  address = {Oldenburg},
  type = {Bachelor Thesis},
  title = {Design and Implementation of Closed-Loop Control for the Reliability of Wind Turbine System},
  abstract = {With increase in number of wind turbine installation capacity worldwide, wind turbine
faces numerous challenges which includes components failure, e cient usage, maintenance
etc. Key factors for wind turbine failures are the dynamic loads. During
operation of the wind turbines in wind farm, fatigue damage cannot be avoided instead
a suitable balance between degradation rate and system performance needs to
be found.
The novel approach to cope up with this challenge is to include closed-loop reliability
control on supervisory control level, where reliability control adapts the system
behaviour to the current situation. The closed-loop reliability control allows continuous
adaptation of the system degradation by in
uencing actual system behaviour
through a selection process among pre-determined possible con gurations which includes
controller gain parameters, set points for yaw misalignment or reduced power,
etc throughout its lifetime.
In this thesis, the design and implementation of reliability closed-loop control system
is made, which includes the controller design for suitable con guration selection and
implementing the controller in a closed-loop system to control the health index of the
turbine component. The controller selects the con guration based on current and desired
health index. For strong turbines in wind farm i.e. turbines exposed to lesser
loads, or have stronger components due to manufacturing variance, in this case the
reliability controller selects con guration which has in
uence on maximizing the power
output which indeed maximizes the loads. For weaker turbines i.e. turbines exposed to
higher loads, in this case the reliability controller selects the con gurations which has
in
uence on load reduction. This leads to better maintenance planning and reduction
in the variance of time to failure for both types of wind turbines i.e. strong and weak
turbines, and allow maintenance close to actual time of failure which further reduces
the operational costs of wind farm. Additionally, the load bearing capacity of stronger
turbine is used up completely which generates high energy yield. Initial investment
cost is reduced through usage of less material and better utilization of material because
of knowledge of time to failure of the turbine. All these aspects contribute to further
reduction in the cost of energy.},
  school = {Carl von Ossietzky Universität Oldenburg},
  author = {Patel, Tushal},
  month = oct,
  year = {2019},
  note = {Advisor: Vlaho Petrovic. Examiners: Martin Kühn, Tobias Meyer}
}