Wind turbines are typically designed for a 20-year operational lifespan. However, for many wind turbines, continued operation beyond this period is technically feasible. TÜV NORD assists operators of wind turbines in evaluating the potential for continued operation. As an independent expert and full-service provider in this interdisciplinary field, TÜV NORD covers both the analytical (theoretical) and practical aspects.
The continued operation analysis by TÜV NORD adheres to the current principles of the BWE (German Wind Energy Association: Principles for Conducting an Evaluation and Examination of the Continued Operation of Wind Turbines (BPW), Berlin, as of May 2017) as well as the current DIBt guideline 2012 from the German Institute for Building Technology.
As part of the analytical examination, the site-specific wind conditions experienced by the wind turbine over its operational period are determined by TÜV NORD in accordance with the latest revision of the Technical Guideline for Wind Turbines, Part 6 "Determination of Wind Potential and Energy Yields" (TR6) by FGW. The effective turbulence intensities at the wind turbine are also calculated by TÜV NORD according to the DIBt guideline 2012. In a subsequent calculation of site-specific loads, the potential for continued operation of the wind turbine is assessed.
As part of the required practical examination, an extended periodic inspection of the wind turbine is conducted. The current state of the entire system, including the foundation, tower, machinery, and rotor blades, is evaluated. TÜV NORD focuses primarily on component fatigue and structural integrity.
The final report contains all important information and background for consideration and specifies the duration of continued operation for the wind turbine being assessed. Additionally, individual measures are developed and documented to ensure safe continued operation.