Windpower Engineering & Development

  • Home
  • Articles
    • Most recent posts
    • News
    • Featured
  • Resources
    • Digital issues
    • Podcasts
    • Suppliers
    • Webinars
    • Events
  • Videos
  • 2025 Leadership
    • 2024 Winners
    • 2023 Winners
    • 2022 Winners
  • Magazine
  • Advertise
  • Subscribe

iSpin Monitor aims to correct yaw misalignments

By Paul Dvorak | August 21, 2015

The iSpin Monitor is intended for permanent installation on the wind turbines. ROMO Wind says its technology enables wind measurements, which until now have been difficult or impossible to measure with

2.iSpin Monitor Advanced provides constant measurements and monitoring of all data obtained from iSpin technology as well as other important measurement parameters, enabling the monitoring and a significantly improved insight into local wind conditions and turbine performance.

iSpin Monitor Advanced provides constant measurements and monitoring of all data obtained from iSpin sensors as well as other important measurement parameters. 

the current wind measurement equipment for wind turbines. The developer offers two levels of service with the monitors:

  1. iSpin Monitor Basicensures that the wind-farm operator will never experience static yaw misalignment on the wind turbines. iSpin Monitor Basic continually measures and monitors the average yaw misalignment while ROMO provides an alert if a static yaw misalignment occurs. ROMO expects – based on its testing of a large number of different turbines so far – a wind farm to increase its annual energy production by 1.5 to 2.0% with yaw correction.
  2. iSpin Monitor Advancedprovides constant measurements and monitoring of all data obtained from iSpin technology as well as other important measurement parameters, enabling the monitoring and a significantly improved insight into local wind conditions and turbine performance.  iSpin Monitor Advanced also monitors the presence of possible yaw misalignments. This level provides accurate readings of wind speed, yaw misalignments (static and dynamic), flow inclinations, turbulence intensity, air pressure, nacelle direction, temperature and more

Note that iSpin Basic only collects measurement results and not raw data. It can be upgraded to the Monitor Advanced at any time. ROMO Wind offers iSpin Monitor as an all-in service. ROMO Wind will take care of planning, installation, commissioning, data collection and reporting.

Regarding yaw misalignments

ROMO Wind distinguishes between static – or average – yaw misalignments and dynamic yaw misalignments. The latter is the standard deviation on the static yaw misalignment.

Static yaw misalignments are frequent

ROMO Wind’s measurements on a large number of randomly selected wind turbines show that more than half of all wind turbines demonstrate a significant static (average) yaw misalignments. The table below shows the distribution of the yaw misalignments measured by ROMO Wind. This statistic is updated regularly.

Romo table common yaw errors

Figure in the table are based on 182 measurement campaigns covering more than 20 turbine types. The figures were last updated: 3/6 2015.

 

Consequences of static yaw misalignments

Yaw misalignments cause considerable revenue losses and unnecessary loads on the turbines, leading to increased maintenance costs and reduced turbine lifetime. ROMO Wind has through several measurement campaigns shown that the relationship between yaw misalignments and annual energy production loss is related to the reduction of swept area of the rotor. The exact effect depends on the wind distribution but follows a Cos2 relationship for an average annual wind speed of 6 m/s. For lower wind speeds, the production loss is higher, and for higher wind speeds, lower. However, the additional loads from yaw misalignment increase with wind speed.

Romo table 2 yaw error deg and opt potIf the wind turbines that ROMO Wind has installed iSpin on had been a wind farm and the static yaw misalignment had been corrected to zero, the production would have increased by 1.6%.

Why do static yaw misalignments occur so often?

The high prevalence of yaw misalignments is not the result of the turbine manufacturers or service teams doing a bad job on the wind turbines. The key reason is that the standard equipment on wind turbines today cannot detect yaw misalignments. The technologies for detecting these problems only became commercially available in recent years – not least because of the iSpin Technology.

There seem to be three main reasons why turbines may present yaw misalignments:

  1. Wind direction sensor issues– If the wind sensor is mounted incorrectly by even a few millimeters, it will have severe consequences on the alignment
  2. Wind farm site conditions– The off-set defined by the turbine manufacturer has not been adjusted to the installation site’s local conditions, causing a potentially large static yaw misalignment

New disturbances of the wind flow over the nacelle roof – If the nacelle sensors are moved to another position on the nacelle roof or other equipment is mounted on the roof (e.g. aviation lights or nacelle LiDARs), they can severely affect the wind flow around the nacelle, having a negative impact on the function and calibration of the nacelle wind sensor measurements and hence on the turbine control.

ROMO Wind

www.romowind.com


Filed Under: News, O&M, Sensors
Tagged With: ispin, romo wind
 

About The Author

Paul Dvorak

Related Articles Read More >

US government allows Empire Wind offshore project to resume construction
Richardson Electronics to deliver pitch energy modules to TransAlta wind fleets
Equinor halts work on Empire Wind offshore project after federal government order
ARESCA wants input on offshore wind standards

Podcasts

Wind Spotlight: Looking back at a year of Thrive with ZF Wind Power
See More >

Windpower Engineering & Development Digital Edition

Digital Edition

Browse the most current issue of Windpower Engineering & Development and back issues in an easy to use high quality format. Clip, share and download with the leading wind power engineering magazine today.

Windpower Engineering & Development
  • Wind Articles
  • Solar Power World
  • Subscribe to Windpower Engineering
  • About Us/Contact Us

Copyright © 2025 WTWH Media LLC. All Rights Reserved. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media
Privacy Policy | Advertising

Search Windpower Engineering & Development

  • Home
  • Articles
    • Most recent posts
    • News
    • Featured
  • Resources
    • Digital issues
    • Podcasts
    • Suppliers
    • Webinars
    • Events
  • Videos
  • 2025 Leadership
    • 2024 Winners
    • 2023 Winners
    • 2022 Winners
  • Magazine
  • Advertise
  • Subscribe