XANT L Development on-track


Source: XANT NV

Creating a portfolio covering wind power needs in the 0.1-10MW range

This year XANT will broaden its product portfolio with the new XANT L platform, taking the XANT USP’s to the 250-330kW power level. The XANT L extends the suitability of the XANT turbines into the MW-size range and for larger off-grid projects that require more installed wind capacity, the XANT L will be a more obvious choice than its smaller brother. For behind-the-meter customers that have electricity consumptions in the 0.5-5GWh range, the XANT L is ideally suited as a distributed-generation production unit. Annual Energy Yield will be in the 500…1000MWh per year, depending upon wind-speed, while the footprint will be similar to the XANT M.

Taking the XANT USP’s to the next power level
The XANT L will build upon the same proven design concepts as the XANT M: Just-Enough-Essential-Parts to keep the turbine simple and robust but thanks to aero-elastic tailoring and powerful control algorithms highly efficient and performant. Although larger to handle, the requirements regarding heavy equipment to install and erect the turbine will be kept to a minimum.

The drive-train will be identical to the XANT M: a direct-drive permanent magnet generator, a stall controlled down-wind rotor, 100% power conversion. A mere scaling-up of the XANT M will not suffice however. To keep the unique features of the containerized transport and crane-less erection, the XANT L had to beat the so-called “square-cube” law: the power rating of turbine increases with the square of the rotor-diameter, but the mass of the components increases with the cube of the rotor-diameter. So as turbines become larger, they become proportionally heavier.

The XANT L tower top mass will only be double that of the XANT M even though the L is three times the rated power. This remarkable feat is achieved by

  • An integrated generator design to ensure the minimal amount of material (and thus mass) used to withstand the mechanical loads
  • A novel generator concept with at the same time a high efficiency and less active parts
  • Very flexible blades alleviating the peak loads under storm conditions while at the same time maximizing power production at above-rated wind speeds

Design process on track for first deliveries in mid-2019
Wind turbine design starts with aerodynamics: the selection of the appropriate airfoils is key to a successful wind power product. XANT collaborates with some of the leading research institutes in wind energy, using their vast knowledge of airfoils to pick the best ones all along the span of the XANT L blade.

Low torsional stiffness for enhanced bend-twist coupling, roughness insensitivity for maintaining aerodynamic efficiency even after long periods of operation without rain, soft-stall behavior for smooth power output. These are just some of the requirements put forward in the selection process. After an initial scan of most of the airfoils available, a short-list was compiled based on aerodynamic properties (lift and drag coefficients). Next, blade-element momentum (BEM) calculations started using the HAWC2 aero-elastic code with the selected airfoils to compare performances and loads. The final step in the design of the structural parts is the detailed dimensioning of the structural elements using Finite-Element Analysis (FEA) tools.

The XANT team expects to finalize the design phase by this summer and start sourcing the components for the first XANT L turbine in Q3-2018. An operational prototype is expected by Q1-2019.

XANT is excited to bring this new machine to the market. Capitalizing on the track record built up with the XANT M in the most extreme conditions from Alaska to Vanuatu, the XANT L will be the big brother the M always wanted.

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 ETR (Extended Temperature Range) versions are available.

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