Is lifetime extension of your ageing turbine the right solution?

New Energy Update has released a new guide for wind turbine owners, operators and service providers to guide the decision-making for extending the lifetime of your ageing wind farm. In other terms, retrofitting your turbines with new equipment and/or updated software to gain stability and increase performance if it is profitable in the long run.

In the guide, FTI Consulting believes that more than 86 GW wind capacity is expected to be decommissioned across Europe by 2030 based on GWEC figures for installed wind capacity worldwide and a typical design life of 20 years for wind turbines. Is your turbine fatiguing and reaching the end of its original designed life or is there potential for lifetime extension?

New Energy Update argues that repowering has become less attractive due to the benefits of lifetime extension:

- Extending the lifespan of a machine typically reduces its lifetime levelized cost of electricity
  (LCOE) and increases project revenue.
- Regulatory approvals are less challenging than repowering options.
- The average cost of extending the life of an operational wind turbine is 100.000 euros pr.
  MW compared to 1 million euros pr. MW for repowering.

Make the right decision based on your turbine's data

In the guide, New Energy Update lists several factors to consider in the decision-making of lifetime extension and hereby perhaps decisions about retrofitting your turbine. One of these factors is the general understanding of the condition of your turbine. In the guide, New Energy Update writes:

“A review of actual loading data – either from historical records or through additional sensor equipment – can reveal the residual usable fatigue life of particular components.”

To this, Philipp Stukenbrock of wind consultancy firm 8.2 Consulting AG further adds:

“You need to understand the analytical calculation of your remaining lifetime per main component in order to mitigate costly repairs during operations after 20 years.”

Other two critical factors to review are the availability of spares and replacement parts and a contractual review considering consents, leases, power purchase agreements and grid connections. Andy Beetham, Commercial Manager of support service at Renewable Energy System (RES) explains that it all should be done in a cost benefit review as the measures that are put in place need to have a payback. Andy Beetham says:

“If you’re fortunate that you can justify an extended operational life without having to change how you operate the wind farm, that would be the best case.”

The key element: the control system

One of the key elements in extending the operational life of your ageing turbine is the control system. Both Andy Beetham and Alex Byrne, Principal Engineer for turbine technology at DNV GL argue for the justification in upgrading the control system for being a key element in a life extension programme for turbines. Andy Beetham says:

“Replacing the turbine controller in its entirety can improve reliability and reduce down time. That allows us to extend the life, but also to increase performance of the wind farm itself.”

Though increased output as a result when replacing components typically implies increased fatigue loads, New Energy Update writes that a new turbine controller with more sophisticated control algorithms and additional sensors can increase the performance of a generator and thus more precisely limit structural loading.

A control system fit for lifetime extension of ageing turbines

Since 2014, life extension services and controller updates have been a growing trend due to the ageing wind farms. Major wind OEMs such as Gamesa and Vestas are now offering upgrade packages for their turbines. However, third party independent service providers and wind engineering companies such as Spica Technology has been developing and upgraded a competitive control system for years. Whereas the OEMs may offer an upgrade for a certain type of turbine of their own, Spica Technology offers a controller that is fit for lifetime extension and designed for several ageing turbine types to improve reliability and performance. Benny Thomsen, CEO at Spica Technology, explains:

“Many OEMs have difficulties in extracting data from their ageing turbines compared to modern turbines. By exchanging the control system with remote control and adding a monitoring system, it enables the possibility to predict maintenance and compare data between turbines.”

How to access your turbine’s data

According to Bø, Vestas plans to share some of its huge data from its turbines to give its customers greater insight. Christian Venderby, head of Vestas’ service sector, says at Bø

“Through many years, we have developed new algorithms that analyse the big data and can identify errors under development or predict breakdowns of components.”

Essentially, the purpose with data is to keep down service costs of the turbine. Access to a turbine’s data enables:

- More knowledge about the turbine.
- Insights to technical challenges before it happens.
- The possibility to plan maintenance and replacements of components.
- Minimum operational losses and reduces down time.

However, access to the turbine’s data is not a new concept. Spica Technology has developed an online SCADA-based monitoring system that gives the turbine owner and service providers access to its turbines and wind farms explains Benny Thomsen and says:

“Our monitoring system has the purpose to keep the service technician out of the turbine as much as possible with remote access to the turbine and a remote control that can restart the turbine. With the monitoring system and remote access, the service technician can predict and plan maintenance to avoid unnecessary service calls to the turbine. Basically, it keeps down the service costs for the turbine owner in the end.”

Download the full white paper guide from New Energy Update here.

Are you considering lifetime extension of your ageing wind farm and want to have more access to your turbine’s data? Then do not hesitate to contact Spica Technology for an informal conversation about the possibilities for you and your turbines.

Released January 16th, 2018.

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