Marine energy. Wave, tidal and other water current converters - Electricity producing wave energy converters. Power performance assessment

Marine energy. Wave, tidal and other water current converters - Electricity producing wave energy converters. Power performance assessment

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1   Scope

Wave Energy Converters (WEC) are designed to operate efficiently at different locations. Systematic methods are used to evaluate the power performance of a WEC at a second location (hereinafter Location 2) based on power performance assessment at a first location (hereinafter Location 1). The degree of similarity of the measured WEC (WEC 1) and the metocean conditions at Location 1 to the secondary WEC (WEC 2) at Location 2 determine the methodology and the applicability of this document.
This document applied in conjunction with the IEC Technical Specification on wave energy resource assessment and characterization (IEC TS 62600‑101), provides a method for estimation of the mean annual energy production of a WEC, assessing the electrical power production performance of a single, non-array, wave energy converter, at Location 2 based on the performance at Location 1.
The scope of this document includes:
  1. a) All wave energy converters that produce electrical power from wave energy.
  2. b) All sea resource zones (near and offshore, deep and shallow water).
  3. c) Capture width matrix transposition from one location to another.
  4. d) Limitation on the changes that are allowed to the WEC and the specification of the location.
  5. e) Wave data required at Location 2, as a minimum the requirements found in IEC TS 62600‑101.
  6. f) Development of the capture width matrix at Location 2.
  7. g) Validation of the capture width matrix at Location 2.
  8. h) Assessment of uncertainties in the derived performance parameters at Location 2.
  9. i) Requirements for the allowable power performance transfer by geometric, kinematic and dynamic similarity.
  10. j) Requirements for the allowable incorporation of additional empirical model data.
  11. k) Requirements for the allowable incorporation of additional numerical model data.
  12. l) The document applies to commercial scale wave energy converters that are:
    1. 1) compliantly moored.
    2. 2) tautly moored.
    3. 3) bottom mounted.
    4. 4) shore mounted.
The scope of this document does not include:
  1. a) Wave energy converters that produce nonelectrical energy.
  2. b) Resource assessment.
  3. c) Scaled devices in test facilities (tank or scaled sea conditions) where any scaling would be carried out to extrapolate results for a full-scale device.
  4. d) Power quality issues.
  5. e) Environmental issues.
  6. f) Operation and maintenance.
  7. g) Annual energy production (AEP).
This document provides a systematic method which includes:
  • • measurement of WEC capture width in a range of sea states.
  • • transposition of capture width from one location to a second location.
  • • an agreed framework for reporting the results of capture width and wave measurements.
  • • estimate of the capture width of a modified WEC at Location 2. This work would include the development of parameters for the modified WEC for the second location.
This document provides:
  • • guidance on the use of observations from Location 1.
  • • methods for assessing and reporting the validity of numerical and physical models.
  • • limits on the permissible changes to the WEC between Locations 1 and 2.
  • • limits on the use of data fitting techniques, and
  • • requirements for reporting.
The wave power industry is at an early stage of development. There is little practical experience with field-scale WECs deployment. Because of this, the present document will be subject to change as more data is collected and experience with wave energy converters develops.