Posters
Come meet the poster presenters to ask them questions and discuss their work
We would like to invite you to come and see the posters at our upcoming conference. The posters will showcase a diverse range of research topics, and will give delegates an opportunity to engage with the authors and learn more about their work. Whether you are a seasoned researcher or simply curious about the latest developments in your field, we believe that the posters will offer something of interest to everyone. So please join us at the conference and take advantage of this opportunity to learn and engage with your peers in the academic community. We look forward to seeing you there!
PO304: Yaw and pitch misalignment detection based on shape sensing technology
João Pacheco, Head of Data Analasys, Fibersail
Abstract
The performance of modern wind turbines (WTs) is one of the most important research fields in wind energy as several factors can affect the rotor aerodynamic. In fact, a significant number of existing WTs are operating outside the accepted aerodynamic imbalance envelope. This imbalance results, between others, from pitch and yaw misalignments. Consequently, this WTs experience annual energy production losses and an increase in vibration, rotor speed variations, as well as loads on most turbine components (and the consequent decrease in remaining useful life). In the context of the condition monitoring system being developed by Fibersail, based on shape sensing technology, a methodology to continuously detect and quantify possible pitch and yaw misalignment was developed and is presented here. An experimental test campaign was defined for an onshore wind farm and three of the WTs instrumented with the shape sensing system from Fibersail (a longitudinal sensor in each blade). The shape sensor was installed in the inner side of the blade, from the root towards the tip on the leading-edge side, to measure the blade deflection. To validate the Fibersail system capability to detect aerodynamic imbalances during WT operation, a set of tests that include pitch and yaw misalignment configurations were implemented, separately, in one of the WTs. For the pitch angle misalignment test, a constant offset was imposed to the "original" pitch angle to a specific blade. In this case, two offsets were adopted: +0,5° and +1°. In a first step, each pitch offset was applied to one blade. In a second step, each offset was applied to all blades simultaneously. Similarly, two yaw offsets (+5° and +10°) were adopted for the yaw angle misalignment test. To cover a wide range of WT operating conditions, each offset step was applied for at least one week for both test methods.
