Second Order Sliding Mode Control of Oscillating Water Column Wave Energy Converters for Power Improvement

Gaebele, Daniel T.; Magaña, Mario E.; Brekken, Ted K. A.; Henriques, J.C.C.; Carrelhas, A.A.D.; Gato, L.M.C.

doi:10.1109/tste.2020.3035501

Cited by 25 publications

(8 citation statements)

References 22 publications

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“…Despite the first patent registered in 1799 and the first wave energy devices being designed in 1898, there are very few commercial wave energy projects in operation and require more attention [10,11]. Wave energy systems have a much higher levelized cost of energy (LCOE) than any other energy source [12] due to the fact that WECs are placed in locations with harsh environmental conditions, and they might not be accessible for up to several weeks studied as weather windows [13,14]. Other factors may also affect the downtime of a WEC and LCOE, such as distance offshore, special permissions, and availability of equipment like boats [15].…”

Section: Introductionmentioning

confidence: 99%

Fault Diagnosis and Condition Monitoring in Wave Energy Converters: A Review

Mortazavizadeh,

Yazdanpanah,

Gaona

et al. 2023

Energies

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The technology used in wave energy conversion systems is still in the early stages of research and development. There are a number of challenges associated with becoming a commercially viable source of renewable energy due to the high operating and maintenance (O&M) costs. A potential solution for increasing the availability of wave energy converters (WECs) and reducing operating and maintenance costs might involve the implementation of condition monitoring and fault-tolerant control systems, because in some reported WEC systems, 57% of total operational expenses go to maintenance activities. The use of condition monitoring techniques in wind energy systems has, for instance, shown the ability to detect failures months in advance, resulting in savings of 15–20% during the operational phase. This paper reviews the methods proposed (and some used) by researchers to monitor WEC’s condition and diagnose faults. Fault-tolerant control methods developed to improve the reliability of WECs and hence their commercial viability are also reviewed and discussed. In addition, a future research plan is provided here.

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Section: Introductionmentioning

confidence: 99%

Fault Diagnosis and Condition Monitoring in Wave Energy Converters: A Review

Mortazavizadeh,

Yazdanpanah,

Gaona

et al. 2023

Energies

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“…A popular SMC for a nonlinear OWC is the super-twisting algorithm presented in [14]. This control strategy has been used in different configurations of OWCs, where it noticeably improved the electric power conversion compared to other strategies [15]. Sliding mode control has also been used to track underwater vehicles' positions [16] due to its robustness characteristics that allow for model uncertainties or environmental disturbances.…”

Section: Introductionmentioning

confidence: 99%

Sliding Mode Control of a Nonlinear Wave Energy Converter Model

Gonzalez

Parker

Anderlini

et al. 2021

JMSE

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The most accurate wave energy converter models for heaving point absorbers include nonlinearities, which increase as resonance is achieved to maximize the energy capture. Over the power production spectrum and within the physical limits of the devices, the efficiency of wave energy converters can be enhanced by employing a control scheme that accounts for these nonlinearities. This paper proposes a sliding mode control for a heaving point absorber that includes the nonlinear effects of the dynamic and static Froude-Krylov forces. The sliding mode controller tracks a reference velocity that matches the phase of the excitation force to ensure higher energy absorption. This control algorithm is tested in regular linear waves and is compared to a complex-conjugate control and a nonlinear variation of the complex-conjugate control. The results show that the sliding mode control successfully tracks the reference and keeps the device displacement bounded while absorbing more energy than the other control strategies. Furthermore, due to the robustness of the control law, it can also accommodate disturbances and uncertainties in the dynamic model of the wave energy converter.

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“…In this method, chattering is completely suppressed because the switching is assigned to the higher order derivative of the desired output (Incremona et al , 2020). In recent years, several algorithms have been proposed to achieve second order or higher order sliding mode control (Liu et al , 2020; Gaebele et al , 2021; Kanti et al , 2018; Sharma and Janardhanan, 2019). However, its main disadvantage is that it needs high-order derivative information of the controlled object model (Bartolini et al , 2016).…”

Section: Introductionmentioning

confidence: 99%

Design of adaptive sliding mode controller applied to ultrasonic motor

Yan

2021

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Purpose The purpose of this paper is to achieve high-precision sliding mode control without chattering; the control parameters are easy to adjust, and the entire controller is easy to use in engineering practice. Design/methodology/approach Using double sliding mode surfaces, the gain of the control signal can be adjusted adaptively according to the error signal. A kind of sliding mode controller without chattering is designed and applied to the control of ultrasonic motors. Findings The results show that for a position signal with a tracking amplitude of 35 mm, the traditional sliding mode control method has a maximum tracking error of 0.3326 mm under the premise of small chattering; the boundary layer sliding mode control method has a maximum tracking error of 0.3927 mm without chattering, and the maximum tracking error of continuous switching adaptive sliding mode control is 0.1589 mm, and there is no chattering. Under the same control parameters, after adding a load of 0.5 kg, the maximum tracking errors of the traditional sliding mode control method, the boundary layer sliding mode control method and the continuous switching adaptive sliding mode control are 0.4292 mm, 0.5111 mm and 0.1848 mm, respectively. Originality/value The proposed method not only switches continuously, but also the amplitude of the switching signal is adaptive, while maintaining the robustness of the conventional sliding mode control method, which has strong engineering application value.

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Second Order Sliding Mode Control of Oscillating Water Column Wave Energy Converters for Power Improvement

Cited by 25 publications

References 22 publications

Fault Diagnosis and Condition Monitoring in Wave Energy Converters: A Review

Fault Diagnosis and Condition Monitoring in Wave Energy Converters: A Review

Sliding Mode Control of a Nonlinear Wave Energy Converter Model

Design of adaptive sliding mode controller applied to ultrasonic motor

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