Libellula - Model DC - Wind Turbine
Libellula DC is a special version of the Libellula wind turbines, designed in order to be used in stand-alone systems, not connected to the electrical network (off-grid). Mechanical and aerodynamic characteristics are those of the standard on-grid models while the electrical control system is designed to be connected with an external battery bank. The wind turbine is able to charge the battery bank, for the electrical supply of isolated users and for the electrification of remote areas without grid availability. Libellula DC allows the composition of a small and simple stand-alone power station supplied by renewable energy sources and equipped with accumulators for energy storage. Stored energy will be available in case of lack of wind.
Typical Applications
Libellula DC is suitable to build stand-alone systems ideal for supplying:
- isolated communities
- pumping, desalinization, water purification systems
- telecommunication plants
- refrigerating systems
- isolated holiday resorts
- electrical machinery in isolated yards
Technical Specifications:
Libellula DC is provided with the same rotor and generator of Libellula 55kW on-grid turbine model, therefore its main features are:
- two-bladed high performance rotor with passive pitch regulation;
- reliable industrial asynchronous generator;
- tubular tower with internal ascent ladder;
- internal access to the nacelle for easy and cheap maintenance;
- “industrial” concept design oriented to easy operation and maintenance.
The energy conversion system has been modified, compared with that of Libellula 55kW in oder to work in parallel with a battery bank.
Wind energy is captured by the rotor and is transformed in electric energy by the three phase asynchronous generator; then it is converted into direct current by means of a regenerative industrial inverter.
Once the battery bank is completely recharged and the DC bus voltage reaches the programmed level, the turbine is automatically stopped.
Specifications
- Cut-in wind speed: 3 m/sec.
- Nominal wind speed: 11 m/sec
- Cut-out wind speed: 25 m/sec.
- Extreme wind: Ve50 = 52,5 m/sec.
- Nominal power: 60kW
- DC bus voltage: 640Vdc
- Number of blades: 2
- Rotor diameter: 18 m
- Rotor speed: variable 60 - 95 rpm
- Gearbox: 2 stages – parallel axes
- Ratio: 1:20
- Nominal power: 125 kW
- Generator type: asynchronous – 4 poles
- Nominal power: 63 kW @ 60Hz/90rpm
- Nominal voltage: 400 V
- Converter type: inverter
- Conversion principle: regenerative with DC output
- Nominal output voltage: 640 Vdc
- Tower: tubular
- Number of sections: 2 or 3
- Hub height: 19m - 25m - 31m
- Material: hot dip galvanized steel
- Location ascent: internal
- Remote control YES
- Yawning system: active
- Yawning motor: n.1
- 1st safety system: passive blade pitch
- 2nd safety system: yawning out of the wind
- Rotor weight: 900 kg
- Nacelle weight inlc. rotor: 2.900 kg
- Tower weight: 5.700 kg (H=25m)
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