Application of Electro-Hydraulic Actuator System to Control Continuously Variable Transmission in Wind Energy Converter

Nguyen, Minh Tri; Dang, Tri Dung; Ahn, Kyoung Kwan

doi:10.3390/en12132499

Cited by 19 publications

(15 citation statements)

References 29 publications

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“…For instances, the sign function was used to reduce the chattering for the proton exchange membrane fuel cell [7], the chattering was reduced by using the saturation function in wind energy conversion system [6], and layer boundary method was utilized to handle the high-frequency oscillation in sliding mode controller for a photovoltaic inverter connected to the power grid [5], etc. However, these methods may remove the chattering phenomenon but they have challenges in presence of uncertainty and external disturbances.…”

Section: Remark 11mentioning

confidence: 99%

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Chattering-Free Single-Phase Robustness Sliding Mode Controller for Mismatched Uncertain Interconnected Systems with Unknown Time-Varying Delays

Nguyen

Duong

et al. 2020

Energies

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Variable structure control with sliding mode can provide good control performance and excellent robustness. Unfortunately, the chattering phenomenon investigated due to discontinuous switching gain restricting their applications. In this paper, a chattering free improved variable structure control (IVSC) for a class of mismatched uncertain interconnected systems with an unknown time-varying delay is proposed. A sliding function is first established to eliminate the reaching phase in traditional variable structure control (TVSC). Next, a new reduced-order sliding mode estimator (ROSME) without time-varying delay is constructed to estimate all unmeasurable state variables of plants. Then, based on the Moore-Penrose inverse approach, a decentralized single-phase robustness sliding mode controller (DSPRSMC) is synthesized, which is independent of time delays. A DSPRSMC solves a complex interconnection problem with an unknown time-varying delay term and drives the system’s trajectories onto a switching surface from the initial time instance. Particularly, by applying the well-known Barbalat’s lemma, the chattering phenomenon in control input is alleviated. Moreover, a sufficient condition is established by using an appropriate Lyapunov theory and linear matrix inequality (LMI) method such that a sliding mode dynamics is asymptotically stable from the beginning time. Finally, a developed method is validated by numerical example with computer simulations.

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Section: Remark 11mentioning

confidence: 99%

“…In practical control systems, chattering and time delays are common phenomena. These have motivated the study of chattering removal problems and time-delay systems, leading to many useful results [1][2][3][4][5][6][7]. The chattering phenomenon causes reducing of control precision or in the worst-case, drive the system to its resonant [8].…”

Section: Introductionmentioning

confidence: 99%

Chattering-Free Single-Phase Robustness Sliding Mode Controller for Mismatched Uncertain Interconnected Systems with Unknown Time-Varying Delays

Nguyen

Duong

et al. 2020

Energies

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“…where is the air density, A is the swept area of the rotor (m 2 ), v w is the wind speed (m/s) and C p is power capture coefficient which is a function of tip speed ratio and pitch angle as [45,46]: where the coefficients C 1 ~ C 6 are different for different rotors, i.e. for a particular NREL 5 MW wind turbine rotor the coefficients are: C 1 = 0.5176, C 2 = 116, C 3 = 0.4, C 4 = 5, C 5 = 21 and C 6 = 0.0068 [45,46]. The tip speed ratio of the wind turbine λ is as following:…”

Section: Mppt (Maximum Power Point Tracking) Control In Regionmentioning

confidence: 99%

Recent Control Technologies for Floating Offshore Wind Energy System: A Review

Truong

Dang

et al. 2020

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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This paper presents the recent control technologies being researched for floating offshore wind energy system (FOWES). FOWES has been getting many attentions recently as an alternative energy system utilizing vast sustainable wind resource away from land with little restriction by human societies, artificial and natural obstacles. However, not only due to the harsh environmental conditions such as strong wind, wave, and current, but also due to the platform motions such as surge, sway, heave, pitch, roll, and yaw, there could occur many problems including less energy capture than expected, frequent emergency stops, turbine structural instability, and fatigues resulting in early failures, which stay the levelized cost of energy (LCOE) still high compared to conventional fixed offshore wind energy system. These risks could be lowered by operating the turbine close to the optimum point and harvesting wind energy efficiently even under strong wind conditions with the properly applied control technologies, while reducing the loads on structural components. Many researches have been actively going on not only by numerical approaches, but also by experimental tests. This study is wrapping the most recent researches on control technologies for promising floating offshore wind energy system according to different substructure designs such as a spar type, semi-submergible type, tension-leg platform (TLP) type, and barge type, and discusses about its challenges as well.

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“…As an important part of the fluid power system, the hydraulic servo system has attracted a wide spread of attention in many years [12,13]. However, the existing literatures regarding the hydraulic servo system usually concentrated on the improvement of tracking performance due to the difficulties result from the highly nonlinear nature of the plant.…”

Section: Introductionmentioning

confidence: 99%

Energy-Efficient Robust Control for Direct Drive and Energy Recuperation Hydraulic Servo System

Wei-ping

Zhao

2020

Complexity

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During the vertical cyclic actuation process of heavy materials handling, the gravitational potential energy will be converted to heat in the form of throttle in the traditional hydraulic system. Therefore, large energy dissipation is inevitable is this process. In order to achieve energy recuperation, as well as precise trajectory tracking, a direct drive and energy recuperation system is developed. To be specific, the function of direct drive and energy recovery is realized via the three-chamber actuator and a hydraulic accumulator. Moreover, the optimized parameters are obtained by the simulated annealing algorithm. To further reduce the energy consumption, the variable supply pressure control circuit is introduced into the system. Furthermore, the prescribed tracking performance is guaranteed by the proposed robust controller. To compensate for the uncertainties, both in the variable supply pressure control circuit and the robust controller, the RBF neural network is employed to approximate the unknown function. The presented approach theoretically possesses the ability to minimize the energy consumption while maintaining satisfied tracking accuracy. The results demonstrate that the proposed approach can save nearly 90 percent of the energy, and the maximum tracking error is 2 mm.

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Application of Electro-Hydraulic Actuator System to Control Continuously Variable Transmission in Wind Energy Converter

Cited by 19 publications

References 29 publications

Chattering-Free Single-Phase Robustness Sliding Mode Controller for Mismatched Uncertain Interconnected Systems with Unknown Time-Varying Delays

Chattering-Free Single-Phase Robustness Sliding Mode Controller for Mismatched Uncertain Interconnected Systems with Unknown Time-Varying Delays

Recent Control Technologies for Floating Offshore Wind Energy System: A Review

Energy-Efficient Robust Control for Direct Drive and Energy Recuperation Hydraulic Servo System

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