Nonlinear PTO Effect on Performance of Vertical Axisymmetric Wave Energy Converter Using Semi-Analytical Method

Liu, Ming; Liu, Hengxu; Zheng, Xing; Chen, Hailong; Wang, Liquan; Zhang, Liang

doi:10.1515/pomr-2017-0104

Cited by 6 publications

(4 citation statements)

References 18 publications

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“…Therefore, only the motion of the float in this direction is considered in the calculation. The equation of the motion of a buoy with a PTO system in the frequency domain is expressed as follows [31] : .…”

Section: Dynamic Characteristics Of the Cab-wec In The Frequency Domainmentioning

confidence: 99%

“…The time variables of the amplitude of the pendulum motion of the linear PTO system can be separated by the above formula. In frequency domain analysis, the average value of the external force power of the PTO damper system in a period is expressed as follows [31] : .…”

Section: Dynamic Characteristics Of the Cab-wec In The Frequency Domainmentioning

confidence: 99%

“…The equation of motion of a buoy with a PTO system in the time domain is expressed as follows [31] :…”

Section: Numerical Solution Of Dynamic Characteristics Of the Cab-wecmentioning

confidence: 99%

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Investigation on PTO control of a Combined Axisymmetric Buoy-WEC(CAB-WEC)

Kong

Liu

et al. 2019

Ocean Engineering

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The Combined Axisymmetric Buoy (CAB), a vertical axisymmetric buoy, has the potential to deliver a high energy absorption power. Considering the CAB-Wave Energy Converters (WEC), in order to achieve higher efficiency, the Power Take Off (PTO) systems, which converts the float motion into energy output, needs to be properly controlled. In this paper, a PTO control method for a CAB-WEC under irregular wave conditions is proposed. Based on the semi-analytical solution obtained in the time domain, a numerical optimization is carried out. The optimal PTO damping coefficients under different wave conditions are obtained, by considering the parameter defined as "capture width ratio". The expression of the optimal PTO damping coefficient in the frequency domain is derived by an analytical method. Based on the semi-analytical solution of time domain dynamic characteristics and analytical method, a comparison between frequency domain optimization and time domain optimization is presented. In general, the two approaches arrive to very similar conclusions, even if with the time domain methodology a slightly higher capture width ratio is achieved. The experimental results have been used to validate the time domain optimization method and the variation in optimal average capture width ratio results.

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Section: Dynamic Characteristics Of the Cab-wec In The Frequency Domainmentioning

confidence: 99%

Section: Dynamic Characteristics Of the Cab-wec In The Frequency Domainmentioning

confidence: 99%

See 1 more Smart Citation

Investigation on PTO control of a Combined Axisymmetric Buoy-WEC(CAB-WEC)

Kong

Liu

et al. 2019

Ocean Engineering

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“…As the global energy supply becomes increasingly limited, reserves of traditional fuel, natural gas, coal, and other nonrenewable energy sources are declining [1]. Issues related to energy supply can directly affect the future of human development, as production capacities and life itself are inseparable from the energy supply.…”

Section: Introductionmentioning

confidence: 99%

A Triboelectric Nanogenerator Based on a Pendulum-Plate Wave Energy Converter

Zhu

Yang

et al. 2022

Polish Maritime Research

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Ocean waves are a promising source of renewable energy, but harvesting this irregular low-frequency energy is challenging due to technological limitations. In this paper, a pendulum plate-based triboelectric nanogenerator (PP-TENG) is proposed. The PP-TENG absorbs wave energy through the pendulum plate installed at the bottom of the device, which generates a swing effect. This drives the motion of the upper TENG power generation unit and generates a charge transfer on the surface of a film of polymer PTFE and nylon, materials which are very sensitive to the low-frequency wave environment. The PP-TENG was tested after building a semi-physical simulation test platform. When the polymer materials were PTFE with a thickness of 0.01 mm and nylon with a thickness of 0.02 mm, 33 commercial LED lamps could be lit simultaneously. Moreover, under short-circuit conditions, the current reached 2.45 μA, and under open-circuit conditions, the voltage reached 212 V. When the PP-TENG was connected in series with a resistor with a resistance of 3 × 105 Ω, its maximum peak power density reached 6.74 mW/m2. It can be concluded that the PP-TENG is characterised by low fabrication costs and excellent energy conversion efficiency. The combination of a pendulum wave energy converter with a TENG shows great output performance. This research lays a solid foundation for practical applications of the proposed structure in the future.

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