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Chapter 17: Marine and Hybrid Renewable-Energy Systems

Geometry, power take-off, mooring, storage, and control

Marine-energy CCD spans hydrodynamic geometry, PTO, generators, mooring, arrays, storage, supervisory control, reliability, and site conditions.

Learning objectives

After completing this chapter, you should be able to:

  1. explain and apply resource and hydrodynamics;

  2. explain and apply geometry and PTO;

  3. explain and apply generator and mooring;

  4. explain and apply array and hybrid system;

  5. formulate and verify the chapter methods on a point absorber extended to a floating wind–wave–hydrogen system.

Mathematical lens

The recurring quantities are geometry, hydrodynamics, PTO, generator, mooring, array, storage, and control:

max¨+brx˙+khx=Fwave+FPTO.m_a\ddot x+b_r\dot x+k_hx=F_{\mathrm{wave}}+F_{\mathrm{PTO}}.
WEC hydrodynamic–PTO–control variables.

Running example

The recurring example is a point absorber extended to a floating wind–wave–hydrogen system. Retaining one system prevents apparent improvements from being caused by changed physics, information, loads, or metrics.

Device geometry changes wave-energy-converter hydrodynamics.
  1. characterize site.

  2. model conversion chain.

  3. co-design device and control.

  4. integrate storage.

  5. validate lab to sea.

Geometry–PTO–control coupling.

Chapter map

  1. Wave and Hydrokinetic Energy Fundamentals

  2. Device Geometry and Hydrodynamics

  3. Power-Take-Off Design

  4. Generator and Drivetrain Design

  5. Mooring and Structural Design

  6. Reactive, Latching, and Model-Predictive Control

  7. Geometry–PTO–Control Coupling

  8. Array Layout and Site Selection

  9. Wind–Wave Hybrid Systems

  10. Storage, Electrolyzers, and Hydrogen Production

  11. Economic and Reliability Considerations

  12. Laboratory and Open-Water Validation