Ocean space has a huge amount of energy. Useful electric energy, generally known as 'ocean energy', can be derived from the ocean. It is an alternative renewable energy source (RES), like solar and wind energy. The important feature of ocean energy resources is that they have the highest density among the other sources of renewable energy.

Chapter Contents:

• 4.1 Introduction
• 4.2 Physics of tidal phenomena
• 4.2.1 Types of tides
• 4.3 Tidal energy estimation
• 4.3.1 Tide generating forces
• 4.3.2 Tidal wave
• 4.3.3 Tidal resonance
• 4.4 Tidal energy extraction
• 4.4.1 Tidal barrage
• 4.4.1.1 Ebb generation
• 4.4.1.2 Flood generation
• 4.4.1.3 Pumping at high tide
• 4.4.1.4 Two-way generation scheme
• 4.4.1.5 Energy calculations
• 4.4.2 Tidal stream
• 4.4.2.1 Tidal energy calculation
• 4.4.2.2 Resource assessment
• 4.5 Tidal current energy conversion devices
• 4.5.1 Tidal current turbines
• 4.5.1.1 Horizontal axis turbines
• 4.5.1.2 Vertical axis turbines
• 4.5.1.3 Oscillating hydrofoil turbines
• 4.5.2 Tidal current generators
• 4.5.2.1 Squirrel cage and wound rotor induction generators
• 4.5.2.2 Doubly fed induction generator
• 4.5.2.3 Permanent magnet synchronous generator
• 4.5.2.4 Direct drive permanent magnet generator
• 4.5.3 Drawbacks of tidal stream generators
• 4.6 Tidal power plants connected to utility grid
• 4.6.1 Capacity limits
• 4.6.2 Power quality
• 4.6.3 System analysis
• 4.7 Environmental impacts
• 4.8 Tidal power pros and cons
• 4.8.1 Pros of tidal power
• 4.8.2 Cons of tidal power
• References

Inspec keywords: hydroelectric power; tidal power stations

Other keywords: tidal energy; renewable energy source; ocean energy

Subjects: Tidal and flow energy; Tidal power stations and plants