Rotational Speed Optimization in Oscillating Water Column Wave Power Plants Based on Maximum Power Point Tracking

Lekube, Jon; Garrido, Aitor J.; Garrido, Izaskun

doi:10.1109/tase.2016.2596579

Cited by 47 publications

(26 citation statements)

References 43 publications

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“…This means that the WEC system should have adequate capability to act as a conventional power plant. The important steady state operation conditions required by the TSO are identified as [13,26]:…”

Section: Electrical Grid and Grid Codes In Australia-king Islandmentioning

confidence: 99%

“…The formulas associated with the turbine and generator rotor, considering the direct drive system of the turbine generator and zero rotational damping coefficient can be written as [3,26,34]:…”

Section: Pmsg and Grid Modelmentioning

confidence: 99%

“…Similar variable speed operations have been proposed for WECs to track the maximum power point (MPP) using different control strategies other than MPC [5,26]. Nevertheless, the choice of variable or fixed speed operation of the turbine depends on its design and operating requirements.…”

Section: Introductionmentioning

confidence: 99%

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A Model Predictive Control-Based Power Converter System for Oscillating Water Column Wave Energy Converters

et al. 2017

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Abstract:Despite the predictability and availability at large scale, wave energy conversion (WEC) has still not become a mainstream renewable energy technology. One of the main reasons is the large variations in the extracted power which could lead to instabilities in the power grid. In addition, maintaining the speed of the turbine within optimal range under changing wave conditions is another control challenge, especially in oscillating water column (OWC) type WEC systems. As a solution to the first issue, this paper proposes the direct connection of a battery bank into the dc-link of the back-to-back power converter system, thereby smoothening the power delivered to the grid. For the second issue, model predictive controllers (MPCs) are developed for the rectifier and the inverter of the back-to-back converter system aiming to maintain the turbine speed within its optimum range. In addition, MPC controllers are designed to control the battery current as well, in both charging and discharging conditions. Operations of the proposed battery direct integration scheme and control solutions are verified through computer simulations. Simulation results show that the proposed integrated energy storage and control solutions are capable of delivering smooth power to the grid while maintaining the turbine speed within its optimum range under varying wave conditions. Keywords: active front end rectifier; finite control set-model predictive control (FCS-MPC); two-level voltage source inverter; wave energy conversion (WEC)

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Section: Electrical Grid and Grid Codes In Australia-king Islandmentioning

confidence: 99%

Section: Pmsg and Grid Modelmentioning

confidence: 99%

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A Model Predictive Control-Based Power Converter System for Oscillating Water Column Wave Energy Converters

et al. 2017

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“…In turn, current is controlled indirectly through voltage, as these signals are dependent each other. There exist different control approaches for this purpose, being the most used traditional PID-based schemes, robust (sliding-mode) schemes and MPC schemes [11][12][13][14][15][16][17][18][19][20][21][22][23]. In particular, when dealing with fusion devices where the available energy is limited, MPC is especially interesting due to its ability to ensure that both the control action and the solution error are minimal [9].…”

Section: Controller Descriptionmentioning

confidence: 99%

State-space Coil Modelling in Plasma Magnetic Confinement Devices

Garrido

González

et al. 2017

MATEC Web Conf.

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Abstract. The need of robust and optimal control schemes is a key factor for the development of future fusion reactors. This paper has dealt with the state-space modelling of the Ultra-Low Iota Super Elongated Stellarator of the UPV/EHU, using a physical lumped parameter equivalent circuit approach. The model obtained has been validated by means of experimental output data showing an excellent matching with the real system. Besides, it has been designed a MPC scheme that has been successfully implemented both in simulation and experimentally using a real-time control platform.

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“…The OWC device continues to have many of its aspects researched. This includes control, turbine speed optimization, generator selection, turbine inertia considerations, power maximisation, permanent–magnet generator operation with irregular waves, short–term wave prediction for operational improvement, and use of impulse turbines …”

Section: Introductionmentioning

confidence: 99%

Multi-chamber oscillating water column wave energy converters and air turbines: A review

2018

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Summary The oscillating water column (OWC) is a more common type of wave energy converter (WEC) that has been the subject of the study and development for several decades. Multi–chamber oscillating water column (MC–OWC) devices or arrays have the advantage of being more efficient in energy extraction compared to a single chamber system, particularly in more chaotic sea states. A variety of single and array OWC devices have been proposed and studied on a small–scale, whereas few large–scale devices have been tested under ocean wave conditions. This paper provides a concise review of the current state of MC–OWC device development in laboratory conditions. The review highlights explicitly the main stages of MC–OWC device development for one ongoing study as an example. This review was based on the available information in the literature from 2003 to 2012, in addition, further work is presented as part of the current study at the University of Technology Sydney. This study is from 2015 to 2018. The discussion shows the challenges that a device needs to overcome to be more competitive with other WECs in the global of wave energy converter area.

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Rotational Speed Optimization in Oscillating Water Column Wave Power Plants Based on Maximum Power Point Tracking

Cited by 47 publications

References 43 publications

A Model Predictive Control-Based Power Converter System for Oscillating Water Column Wave Energy Converters

A Model Predictive Control-Based Power Converter System for Oscillating Water Column Wave Energy Converters

State-space Coil Modelling in Plasma Magnetic Confinement Devices

Multi-chamber oscillating water column wave energy converters and air turbines: A review

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