Test Turbine

The Bergey Excel is a three-bladed upwind wind turbine rated at a 10-kW output at 13.0 m/s. It is connected to a Bergey Gridtek-10 inverter, which provides power to the NWTC public service electrical grid.

The Excel uses a permanent magnet alternator to produce three-phase variable frequency output at a nominal 240 volts. The three-phase output is then rectified to DC power and converted to single-phase, 240-volt, 60-Hz AC power in the Gridtek inverter.

As with the original set, the modified turbine blades are made from pultruded fiberglass. The configuration of the blades was changed, however. They are 41.5 cm shorter and use the SH3052 airfoil—changes that were intended to improve performance and decrease noise. In high wind speeds (greater than about 15.6 m/s), the turbine will turn out of the wind (known as furling) to protect the turbine from over-speeding. Table 1 lists basic turbine configuration and operational data.

Figure 1. The Bergey Excel wind turbine.
Table 1. Test Turbine Configuration and Operational Data

General Configuration:

Make, Model, Serial Number

Bergey WindPower, Excel, #9900550

Rotation Axis (H/V)

Horizontal

Orientation (upwind/downwind)

Upwind

Number of Blades

3

Rotor Hub Type

Rigid

Rotor Diameter (m)

6.17

Hub Height (m)

37

Performance:

Rated Electrical Power (kW)

10

Rated Wind Speed (m/s)

13.0

Cut-In Wind Speed (m/s)

3.1

Cut-Out Wind Speed (m/s)

none

Rotor:

Swept Area (m2)

29.9

Direction of Rotation

Counterclockwise

Rotor Speed (rpm)

0-400

Power Regulation (active or passive)

Passive

Tower:

Type

Bergey Guyed Lattice

Height (m)

36.6

Control/Electrical System:

Controller: Make, Type

Bergey Gridtek Inverter

Electrical Output Voltage

Nominal 240-Volt Single Phase

Yaw System:

Wind Direction Sensor

Tail Vane

Renewable Energy Eco Friendly

Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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