Investigation of the Error of Mean Representative Current Velocity Based on the Method of Bins for Tidal Turbines Using ADP Data
Representing the velocity at a tidal energy extraction site in a standardized manner is essential for the development of the tidal energy sector. The International Electrotechnical Commission (IEC) have issued a technical specification to determine the mean representative current velocity (MRV) rela...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-05-01
|
| Series: | Journal of Marine Science and Engineering |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2077-1312/8/6/390 |
| _version_ | 1797566735006564352 |
|---|---|
| author | Udara Rathnayake Matt Folley S.D.G.S.P. Gunawardane Carwyn Frost |
| author_facet | Udara Rathnayake Matt Folley S.D.G.S.P. Gunawardane Carwyn Frost |
| author_sort | Udara Rathnayake |
| collection | DOAJ |
| description | Representing the velocity at a tidal energy extraction site in a standardized manner is essential for the development of the tidal energy sector. The International Electrotechnical Commission (IEC) have issued a technical specification to determine the mean representative current velocity (MRV) relative to a tidal energy converter (TEC). This method determines the MRV using an acoustic Doppler profiler (ADP). This is used to evaluate the power performance of a TEC and so can have a significant influence on the power performance uncertainties, due to the cubed relationship of the MRV and power. This paper investigates these uncertainties in the MRV by considering four sources of uncertainty in the ADP. These are turbulence intensity, tilt, Doppler noise and beam misalignment of an ADP. A synthetically generated dataset is used to define current velocity and profile using the characteristics of currents and ADP. The generated synthetic dataset is processed to calculate the MRV based on the standard IEC method. An alternative method to calculate the MRV, called the temporal-spatial method (TSM), is proposed and the two methodologies are used to assess the error of the MRV. A sensitivity analysis shows that the errors of the MRV based on the standard IEC method are always higher than the TSM. The biases in the MRV based on the different combinations of the uncertainty are investigated and it is found that the bias for the MRVs based on the TSM method is generally less than that of the IEC method. |
| first_indexed | 2024-03-10T19:30:37Z |
| format | Article |
| id | doaj.art-65aeb896ff3142eab8d526dd6abaa9c8 |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-10T19:30:37Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-65aeb896ff3142eab8d526dd6abaa9c82023-11-20T02:07:23ZengMDPI AGJournal of Marine Science and Engineering2077-13122020-05-018639010.3390/jmse8060390Investigation of the Error of Mean Representative Current Velocity Based on the Method of Bins for Tidal Turbines Using ADP DataUdara Rathnayake0Matt Folley1S.D.G.S.P. Gunawardane2Carwyn Frost3Department of Mechanical Engineering, Faculty of Engineering, University of Peradeniya, Peradeniya 20400, Sri LankaMarine Research Group, Queen’s University Belfast, Belfast BT9 5AG, Northern Ireland, UKDepartment of Mechanical Engineering, Faculty of Engineering, University of Peradeniya, Peradeniya 20400, Sri LankaMarine Research Group, Queen’s University Belfast, Belfast BT9 5AG, Northern Ireland, UKRepresenting the velocity at a tidal energy extraction site in a standardized manner is essential for the development of the tidal energy sector. The International Electrotechnical Commission (IEC) have issued a technical specification to determine the mean representative current velocity (MRV) relative to a tidal energy converter (TEC). This method determines the MRV using an acoustic Doppler profiler (ADP). This is used to evaluate the power performance of a TEC and so can have a significant influence on the power performance uncertainties, due to the cubed relationship of the MRV and power. This paper investigates these uncertainties in the MRV by considering four sources of uncertainty in the ADP. These are turbulence intensity, tilt, Doppler noise and beam misalignment of an ADP. A synthetically generated dataset is used to define current velocity and profile using the characteristics of currents and ADP. The generated synthetic dataset is processed to calculate the MRV based on the standard IEC method. An alternative method to calculate the MRV, called the temporal-spatial method (TSM), is proposed and the two methodologies are used to assess the error of the MRV. A sensitivity analysis shows that the errors of the MRV based on the standard IEC method are always higher than the TSM. The biases in the MRV based on the different combinations of the uncertainty are investigated and it is found that the bias for the MRVs based on the TSM method is generally less than that of the IEC method.https://www.mdpi.com/2077-1312/8/6/390currentsturbulenceuncertaintyacoustic Doppler ProfilertiltDoppler noise |
| spellingShingle | Udara Rathnayake Matt Folley S.D.G.S.P. Gunawardane Carwyn Frost Investigation of the Error of Mean Representative Current Velocity Based on the Method of Bins for Tidal Turbines Using ADP Data Journal of Marine Science and Engineering currents turbulence uncertainty acoustic Doppler Profiler tilt Doppler noise |
| title | Investigation of the Error of Mean Representative Current Velocity Based on the Method of Bins for Tidal Turbines Using ADP Data |
| title_full | Investigation of the Error of Mean Representative Current Velocity Based on the Method of Bins for Tidal Turbines Using ADP Data |
| title_fullStr | Investigation of the Error of Mean Representative Current Velocity Based on the Method of Bins for Tidal Turbines Using ADP Data |
| title_full_unstemmed | Investigation of the Error of Mean Representative Current Velocity Based on the Method of Bins for Tidal Turbines Using ADP Data |
| title_short | Investigation of the Error of Mean Representative Current Velocity Based on the Method of Bins for Tidal Turbines Using ADP Data |
| title_sort | investigation of the error of mean representative current velocity based on the method of bins for tidal turbines using adp data |
| topic | currents turbulence uncertainty acoustic Doppler Profiler tilt Doppler noise |
| url | https://www.mdpi.com/2077-1312/8/6/390 |
| work_keys_str_mv | AT udararathnayake investigationoftheerrorofmeanrepresentativecurrentvelocitybasedonthemethodofbinsfortidalturbinesusingadpdata AT mattfolley investigationoftheerrorofmeanrepresentativecurrentvelocitybasedonthemethodofbinsfortidalturbinesusingadpdata AT sdgspgunawardane investigationoftheerrorofmeanrepresentativecurrentvelocitybasedonthemethodofbinsfortidalturbinesusingadpdata AT carwynfrost investigationoftheerrorofmeanrepresentativecurrentvelocitybasedonthemethodofbinsfortidalturbinesusingadpdata |