How Do Coemi Wind Turbines Work?
There are four basic ways of explaining the question, "How do wind turbines work?" Our turbines typically consist of two or three blades, which spin as the wind comes into contact with them. These turn a shaft, which is connected to a generator, which then makes electricity.
How does a wind turbine work? It goes without saying that wind speed is vital in determining how much electricity your Coemi wind turbine can produce. Measuring wind speed is achieved through a built-in wind speed anemometer. This carries information to a Siemans S7-200 controller (which starts up the turbine). At the minimum of 2.5 m/s, the turbine starts converting a light breeze into power. The turbine can still keep generating even at maximum wind speeds of up to 55 mph.
2. Blade Design
Fixed Pitch Stall Regulated Blades (FPSRB) ensure that the generator will operate even in strong gusty wind conditions.
Because the blades are fixed with no moving parts, they are more robust and lighter than variable pitch turbines with the additional benefit of a lower start up generating wind speed from 2.5 m/s.
Inivative blade design makes the Coemi 55/15 Wind Turbine ideal for UK and Europe's strong gusty wind conditions, keeping Coemi turbines generating in both light and strong winds.
Wind direction, also measured by the Siemans S7-200 controller automatically operates a hydraulic motor in the head to move the turbine into the wind once the wind speed reaches 2.5 m/s or 5.5 mph. Once the generator reaches maximum output, the blades will spill extra wind to enable the turbine to keep generating in winds up to 25m/s (55mph). Unlike other small wind turbines which use a dump to burn off excess generation, 100% of generated power is passed to the grid with the ABB M2QA asynchronous generator.
The Coemi 55/15 wind turbines have a fixed rotation speed with its 50Hz generator. The local grid voltage is matched automatically through the generators Electro magnets. Unlike other permanent magnet small wind turbines which are usually variable voltage and require rectification to DC before conversion to AC through an inverter wasting 20% of the energy generated.
As the wind strength builds the torque is converted through the gearbox to the generator and load is automatically increased producing amps. These amps are directly transmitted to the grid through a total generation meter registering the total kWh’s generated. This total is used for the payment of your FIT (feed in Tariff). Your system will absorb this power lowering your energy usage and any excess that escapes will register on your export meter earning you valuable income from your supplier.
The Coemi has a double safety system to protect against over speed from high winds and loss of grid. Through the Siemans controller a Fail safe normally on double hydraulic disc brake is applied and the head is turned away from the wind by tandum electric yaw motors. Not only is the generator protected for the life of the turbines and blade life increased, but maintenance costs are also reduced.