Numerical and experimental research on a resonance-based wave energy converter

Cai, Yuanqi; Huo, Yinquan; Shi, Xiangyu; Liu, Yang

doi:10.1016/j.enconman.2022.116152

Cited by 22 publications

(11 citation statements)

References 46 publications

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“…Various wave energy converters have emerged worldwide over the past few decades and their performance has been systematically studied [83][84][85][86][87]. A comprehensive waveto-wire model was developed to evaluate wave energy's conversion from sea resources to the grid [88].…”

Section: Wave Energy Conversion Technologiesmentioning

confidence: 99%

The Energy Conversion and Coupling Technologies of Hybrid Wind–Wave Power Generation Systems: A Technological Review

Wang,

Sun,

Zhao

et al. 2024

Energies

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Based on the mutual compensation of offshore wind energy and wave energy, a hybrid wind–wave power generation system can provide a highly cost-effective solution to the increasing demands for offshore power. To provide comprehensive guidance for future research, this study reviews the energy conversion and coupling technologies of existing hybrid Wind–wave power generation systems which have not been reported in previous publications. The working principles of various wind and wave energy conversion technologies are summarised in detail. In addition, existing energy coupling technologies are specifically classified and described. All aforementioned technologies are comprehensively compared and discussed. Technological gaps are highlighted, and future development forecasts are proposed. It is found that the integration of hydraulic wind turbines and oscillating wave energy converters is the most promising choice for hybrid wind–wave power extraction. DC and hydraulic coupling are expected to become mainstream energy coupling schemes in the future. Currently, the main technological gaps include short their operating life, low energy production, limited economic viability, and the scarcity of theoretical research and experimental tests. The field offers significant opportunities for expansion and innovation.

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Section: Wave Energy Conversion Technologiesmentioning

confidence: 99%

The Energy Conversion and Coupling Technologies of Hybrid Wind–Wave Power Generation Systems: A Technological Review

Wang,

Sun,

Zhao

et al. 2024

Energies

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“…Then its mechanical power, response amplitude operator and capture width ratio (CWR) have been tested via the wave flume tests in regular or irregular waves [12]. Afterwards, the radiation hydrodynamic parameters identification, wave force identification and power estimation for the above NIPWEC structure have been researched by complementing numerical wave tank tests [13]. Herein the NIPWEC structure is modified.…”

Section: Research Objectmentioning

confidence: 99%

Speed-and-pressure combined control for the CPHPTO of an inverse pendulum wave energy converter

Yue

Liu

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Constant pressure hydraulic power take-off (CPHPTO) utilizes a high-pressure accumulator to weaken its oil pressure fluctuations. However, CPHPTO operating point still changes violently under the circumstance of the changeable irregular waves as well as the limited volume of the high-pressure accumulator. This causes CPHPTO to work away from the designed operating point and even to run in the inefficient and unstable region. This paper proposes a speed-and-pressure combined control (SPCC) strategy, which keeps system speed/pressure around the designed value via the vector control of a PMSG or the displacement tuning of a hydraulic motor, for the efficient and stable operation of a CPHPTO. A SPCC strategy for the CPHPTO embedded in a novel inverse pendulum wave energy converter (NIPWEC) is designed in detail. Furthermore, the overall wave-to-wire dynamic model is simulated in irregular waves to research the effect of SPCC. Results show that both the SPCC with an oil pressure open-loop regulator (OPOLR) and the SPCC with an oil pressure closed-loop regulator (OPCLR) can effectively stabilize the system speed/pressure. Besides, SPCC, especially the SPCC with OPCLR, can effectively improve both the efficiency and stability of CPHPTO. Moreover, system-speed control is more significant than system-pressure control in terms of improving CPHPTO efficiency.

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“…Three ways can be used to realize natural period control. The first is inertia adjustment [9,10], the second can be called stiffness adjustment (SA) [11][12][13][14][15][16], and the third is known as surface control [17]. SA is the most common NPCM.…”

Section: Introductionmentioning

confidence: 99%

Multi-Timescale Lookup Table Based Maximum Power Point Tracking of an Inverse-Pendulum Wave Energy Converter: Power Assessments and Sensitivity Study

Yue,

Zhang,

Meng

et al. 2023

Energies

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A novel, inverse-pendulum wave energy converter (NIPWEC) is a device that can achieve natural period control via a mass-position-adjusting mechanism and a moveable internal mass. Although the energy capture capacity of a NIPWEC has already been proven, it is still meaningful to research how to effectively control the NIPWEC in real time for maximum wave energy absorption in irregular waves. This paper proposes a multi-timescale lookup table based maximum power point tracking (MLTB MPPT) strategy for the NIPWEC. The MLTB MPPT strategy was implemented to achieve a theoretical “optimal phase” and “optimal amplitude” by adjusting both the position of the internal mass and linear power take-off (PTO) damping. It consists of two core parts, i.e., internal mass position adjustment based on a 1D resonance position table and PTO damping tuning based on a 2D optimal PTO damping table. Furthermore, power assessments and sensitivity study were conducted for eight irregular-wave sea states with diverse wave spectra. The results show that energy period resonance and the lookup table based PTO damping tuning have the highest possibility of obtaining the maximum mean time-averaged absorbed power. Additionally, both of them are robust to parameter variations. In the next step, the tracking performance of the MLTB MPPT strategy in terms of changing sea states will be studied in-depth.

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Numerical and experimental research on a resonance-based wave energy converter

Cited by 22 publications

References 46 publications

The Energy Conversion and Coupling Technologies of Hybrid Wind–Wave Power Generation Systems: A Technological Review

The Energy Conversion and Coupling Technologies of Hybrid Wind–Wave Power Generation Systems: A Technological Review

Speed-and-pressure combined control for the CPHPTO of an inverse pendulum wave energy converter

Multi-Timescale Lookup Table Based Maximum Power Point Tracking of an Inverse-Pendulum Wave Energy Converter: Power Assessments and Sensitivity Study

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