Guide: How wind turbines work

Wind energy is one of the most environmentally friendly and sustainable forms of energy generation. Wind turbines utilise the natural kinetic energy of the wind to generate electrical energy. This guide explains in detail how wind turbines work, their main components and how they can be utilised efficiently. Perfect for beginners and anyone interested in understanding the potential of wind energy.

Why wind power?

Advantages of wind energy

Environmentally friendly: Wind energy is emission-free and significantly reduces CO₂ emissions.

Sustainable: Wind is a renewable energy source that will not run dry.

Cost-efficient: Once installed, the operating costs are relatively low.

Wide range of applications: Wind power can be used both onshore (on land) and offshore (in the sea).

Economic benefits: Creates jobs in manufacturing, installation and maintenance.

Challenges of wind energy

Dependence on location: Wind turbines require locations with sufficient wind

Visual and acoustic impact: Some people find the turbines disturbing to the landscape or the peace and quiet.

Cost of installation: The initial investment is high, but is amortised over the lifetime of the system.

How does a wind turbine work?

Wind turbines convert the kinetic energy of the wind into electrical energy. This happens in several steps:

1. capturing the wind

Rotor blades: The rotor blades capture the wind and convert its kinetic energy into a rotary motion. The larger the rotor blades, the more energy can be captured.

Principle of lift: The aerodynamic shape of the rotor blades generates lift, similar to aircraft wings, which drives the rotation.

2. conversion into mechanical energy

Rotor shaft: The rotary motion of the rotor blades is transmitted to a gearbox via the rotor shaft.

Gearbox: This increases the rotational speed in order to operate the generator efficiently.

3. generation of electrical energy

Generator: The generator converts the mechanical energy of the rotor shaft into electrical energy

Alternating current generation: The generator produces alternating current (AC) that can be fed directly into the power grid

4. transmission to the power grid

Transformer: The generated electrical energy is converted to the appropriate voltage for the power grid in a transformer.

Feed-in: The electricity is fed into the grid to supply households, businesses and facilities with renewable energy

Main components of a wind turbine

Rotor blades:

Capture the wind and drive the rotor shaft

Made from lightweight but strong materials such as glass fibre or carbon fibre

Hub:

Connects the rotor blades to the rotor shaft.

Nacelle:

Houses the generator, gearbox and other mechanical components

Rotates on a Yaw system to optimally align the rotor blades with the wind.

Gearbox:

Increases the speed of the rotor shaft to operate the generator efficiently

Generator:

Converts the mechanical energy into electrical energy

Tower:

Holds the rotor blades and nacelle at a height where the wind is strongest

Towers can be made of steel, concrete or a combination of both materials.

Transformer:

Adjusts the voltage of the electricity generated before it is fed into the grid

Types of wind turbines

1. onshore wind turbines

These turbines are located on land and are the most common form of wind energy utilisation. They are cheaper to install, but are subject to site restrictions due to development or nature reserves.

2. offshore wind turbines

These turbines are located in the sea, where the wind is stronger and more constant. They are more powerful, but also more expensive due to installation and maintenance.

3. small wind turbines

Smaller systems for own use, e.g. for rural households, small businesses or remote locations

Factors for the efficiency of wind turbines

Wind speed:

The output of a wind turbine increases with the third power of the wind speed.

Ideal locations have average wind speeds of 6-10 m/s.

Height of the tower:

The higher the tower, the stronger and more constant the wind

Size of the rotor blades:

Larger rotor blades can capture more energy, but are more expensive and more challenging to construct.

Technical maintenance:

Regular maintenance and inspections maximise service life and efficiency

Choosing a location:

Open areas without obstacles such as trees or buildings are ideal.

Offshore locations offer higher energy yields as the wind is less disturbed there

Economic and ecological aspects

Costs and amortisation

The acquisition costs for a large wind turbine are between 1 and 2 million euros per megawatt (MW) of capacity.

Authorisation period: 6-10 years, depending on wind conditions and subsidy programmes

Environmental benefits

Avoidance of greenhouse gases: A 2 MW system can save around 4,000 tonnes of CO₂ per year.

Low environmental impact: Modern plants are designed to minimise the impact on flora and fauna.

The future of wind energy

Wind energy technology is constantly evolving:

Larger turbines: Modern turbines reach outputs of 15 MW and more.

Advanced materials: New rotor blades are lighter and more efficient.

Hybrid solutions: Combination of wind energy with solar and storage technologies.

Intelligent control: AI-based systems optimise performance and reduce maintenance costs.

Floating wind farms: Floating offshore wind farms enable the utilisation of deeper waters.

Conclusion: Wind power as the energy source of the future

Wind turbines offer a sustainable and efficient way of generating renewable energy. They are a key component of the energy transition and help to meet global energy needs in an environmentally friendly way. With the right choice of location, modern technology and regular maintenance, wind turbines can make a significant contribution to reducing CO₂ emissions.

Harness the power of the wind and invest in a sustainable future!