Back to the future for Pacific mid-size wind

XANT repowers ageing turbines while valorizing existing infrastructure

When one of the biggest utility companies in the world turned to XANT to find a repowering solution for an older mid-size wind turbine, our design department gladly accepted the challenge. Raising the bar even higher, they wanted a gearless turbine as replacement of the current machine to be installed on the existing tower. And oh yes, OPEX had to be less than half and noise levels had to come down significantly as nearby neighbors had filed complaints.

To further add to the challenge, the site is very remote and thus we were up against the concomitant logistic nightmares in terms of size, weight and time-to-destination. The site is a class II wind-site but with frequent cyclone passage demanding a turbine that can be tilted-down in a record time and is able to withstand very extreme wind loads, even when tilted down.

We set out to assess the load-bearing capacity of the tilt-up tower in collaboration with a specialized structural-design bureau in France. A detailed finite-element analysis was performed to conclude that the tower can handle the mechanical loads of the XANT M-21 with sufficient margin.
Next, the XANT design team developed a specific interface to the XANT M yaw bearing to adapt to the tower-top flange already in place. The simplicity of the design of the XANT M is the best way to ensure the clients’ minimal maintenance request; and as the XANT M is the most silent turbine in its class also the neighbors will be happy.

The customized XANT M design was shipped in a standard 40ft container (as any XANT turbine) and arrived on-site in October; the turbine was installed and commissioned in November with the assistance of the local O&M crew. Testing and training of the staff will continue to be completely ready for the upcoming cyclone season.

Ambition levels of the utility for this island are high: the amount of renewables should increase to reach a 60-70% energy penetration ratio, the economic optimum at current fuel and battery costs. XANT is ready to help our client to achieve this target by further optimizing our solution based on our robust XANT M platform.

 

 

 

 

 

About XANT:
XANT is a manufacturer of midsize (50…500kW) turbines for the microgrid and off-grid markets. XANT turbines are designed with microgrid applications in mind and a with a special focus on remote areas and harsh operating conditions. They have Just Enough Essential Parts (JEEP!), fit in 40ft containers and can be erected without a crane. For deployment in typhoon-prone areas the turbines can be lowered to the ground, also facilitating the maintenance. XANT turbines have the capability of active power curtailment and can be equipped with integrated energy storage to allow for a high penetration rates.

The extreme simplicity, easy maintenance, silent operation and low cost of ownership make XANT turbines ideally suited for wind power on remote locations and close to the consumer.

The XANT product portfolio consist of the XANT M (100kW) and the XANT L (330kW) – commercially available in 2019- platforms. Both turbine types exist in class Ia (average wind speeds up to 10m/s) and class IIIa (7.5m/s) executions; for extremely cold areas the XANT M ETR (Extended Temperature Range) version is available.