Dynamic Characterization and Performance Evaluation of a 10-kW Power Take-Off with Mechanical Motion Rectifier for Wave Energy Conversion

Xiaofan Li; Chien-An Chen; Shuo Chen; Qiuchi Xiong; Jianuo Huang; Scott Lambert; Jonathan Keller; Robert Parker; Lei Zuo

doi:10.1016/j.oceaneng.2022.110983

Dynamic Characterization and Performance Evaluation of a 10-kW Power Take-Off with Mechanical Motion Rectifier for Wave Energy Conversion

Xiaofan Li, Chien-An Chen, Shuo Chen, Qiuchi Xiong, Jianuo Huang, Scott Lambert, Jonathan Keller, Robert Parker, Lei Zuo

National Wind Technology Center

Research output: Contribution to journal › Article › peer-review

20 Scopus Citations

Abstract

The power take-off (PTO) is a key component for wave energy converters. In this paper, a compact PTO with mechanical motion rectification rated at 10 kW is designed and prototyped, and characterized. A piecewise nonlinear dynamic model is established to describe its unique dynamic property. A linear hydraulic actuator is adopted in lab testing to drive the prototype and the unknown parameters of the dynamic model are identified. Further verification shows that the model can predict the dynamic performance of the PTO well. The test results show that the mechanical motion rectifier-based PTO can achieve overall energy transfer efficiency as high as 65% in regular waves even when the generator is working below the rated electric load and speed. In the irregular wave test, the PTO achieved the overall energy transfer efficiency of 54%, and the peak-to-average ratio acquired during the test is 12.5.

Original language	American English
Article number	110983
Number of pages	10
Journal	Ocean Engineering
Volume	250
DOIs	https://doi.org/10.1016/j.oceaneng.2022.110983 https://doi.org/10.1016/j.oceaneng.2022.110983
State	Published - 15 Apr 2022

Bibliographical note

Publisher Copyright:
© 2022

NREL Publication Number

NREL/JA-5000-81280

Keywords

Dry lab test
Ocean wave energy
Power take-off
Wave energy converter

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Li, X., Chen, C.-A., Chen, S., Xiong, Q., Huang, J., Lambert, S., Keller, J., Parker, R., & Zuo, L. (2022). Dynamic Characterization and Performance Evaluation of a 10-kW Power Take-Off with Mechanical Motion Rectifier for Wave Energy Conversion. Ocean Engineering, 250, Article 110983. https://doi.org/10.1016/j.oceaneng.2022.110983, https://doi.org/10.1016/j.oceaneng.2022.110983

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abstract = "The power take-off (PTO) is a key component for wave energy converters. In this paper, a compact PTO with mechanical motion rectification rated at 10 kW is designed and prototyped, and characterized. A piecewise nonlinear dynamic model is established to describe its unique dynamic property. A linear hydraulic actuator is adopted in lab testing to drive the prototype and the unknown parameters of the dynamic model are identified. Further verification shows that the model can predict the dynamic performance of the PTO well. The test results show that the mechanical motion rectifier-based PTO can achieve overall energy transfer efficiency as high as 65% in regular waves even when the generator is working below the rated electric load and speed. In the irregular wave test, the PTO achieved the overall energy transfer efficiency of 54%, and the peak-to-average ratio acquired during the test is 12.5.",

keywords = "Dry lab test, Ocean wave energy, Power take-off, Wave energy converter",

author = "Xiaofan Li and Chien-An Chen and Shuo Chen and Qiuchi Xiong and Jianuo Huang and Scott Lambert and Jonathan Keller and Robert Parker and Lei Zuo",

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AU - Li, Xiaofan

AU - Chen, Chien-An

AU - Chen, Shuo

AU - Xiong, Qiuchi

AU - Huang, Jianuo

AU - Lambert, Scott

AU - Keller, Jonathan

AU - Parker, Robert

AU - Zuo, Lei

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N2 - The power take-off (PTO) is a key component for wave energy converters. In this paper, a compact PTO with mechanical motion rectification rated at 10 kW is designed and prototyped, and characterized. A piecewise nonlinear dynamic model is established to describe its unique dynamic property. A linear hydraulic actuator is adopted in lab testing to drive the prototype and the unknown parameters of the dynamic model are identified. Further verification shows that the model can predict the dynamic performance of the PTO well. The test results show that the mechanical motion rectifier-based PTO can achieve overall energy transfer efficiency as high as 65% in regular waves even when the generator is working below the rated electric load and speed. In the irregular wave test, the PTO achieved the overall energy transfer efficiency of 54%, and the peak-to-average ratio acquired during the test is 12.5.

AB - The power take-off (PTO) is a key component for wave energy converters. In this paper, a compact PTO with mechanical motion rectification rated at 10 kW is designed and prototyped, and characterized. A piecewise nonlinear dynamic model is established to describe its unique dynamic property. A linear hydraulic actuator is adopted in lab testing to drive the prototype and the unknown parameters of the dynamic model are identified. Further verification shows that the model can predict the dynamic performance of the PTO well. The test results show that the mechanical motion rectifier-based PTO can achieve overall energy transfer efficiency as high as 65% in regular waves even when the generator is working below the rated electric load and speed. In the irregular wave test, the PTO achieved the overall energy transfer efficiency of 54%, and the peak-to-average ratio acquired during the test is 12.5.

KW - Dry lab test

KW - Ocean wave energy

KW - Power take-off

KW - Wave energy converter

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Dynamic Characterization and Performance Evaluation of a 10-kW Power Take-Off with Mechanical Motion Rectifier for Wave Energy Conversion

Abstract

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NREL Publication Number

Keywords

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