Comparison of control strategies performance for a Wave Energy Converter

Valério, Duarte; Beirão, Pedro; Mendes, Mário J. G. C.; Costa, José Sá da

doi:10.1109/med.2008.4602139

Cited by 22 publications

(19 citation statements)

References 14 publications

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“…Apart from the converter itself, it is needed to pay special attention to the control system that will assure the maximum power extraction in every operating condition. There exists a list of control techniques which are mainly considered [13], e.g. reactive control, phase and amplitude, switching control, latching control… Furthermore, aspects such as the influence and the requirements for the connection between wave farms and the common grid should also be taken into consideration.…”

Section: B Ocean Energy Generationmentioning

confidence: 99%

Voltage margin control for offshore multi-use platform integration

Mier¹,

Casielles²,

Koto³

et al. 2024

RE&PQJ

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Abstract-This paper discusses a multiterminal direct current (MTDC) connection proposed for integration of offshore multi-use platforms into continental grids. Voltage source converters (VSC) were selected for their suitability for multiterminal dc systems and for their flexibility in control. A five terminal VSC-MTDC which includes offshore generation, storage, loads and ac connection, was modeled and simulated in DigSILENT Power Factory software. Voltage margin method has been used for reliable operation of the MTDC system without the need of fast communication. Simulation results show that the proposed system was able to maintain constant dc voltage operation during fluctuations in the generation and changes in the demand. Moreover, it was able to secure power supply to passive loads during loss of a dc voltage regulating terminal and to perform a dispatch scheme where it is possible to buy, sell or store energy attending to the price in the electricity market.

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Section: B Ocean Energy Generationmentioning

confidence: 99%

Voltage margin control for offshore multi-use platform integration

Mier¹,

Casielles²,

Koto³

et al. 2024

RE&PQJ

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“…The research of the most suitable control strategies is a challenging issue for energy developers [9][10][11][12]. Up to now, the most commonly adopted techniques are:…”

Section: Control Of Point Absorbersmentioning

confidence: 99%

Impact of control strategies on the rating of electric power take off for Wave Energy conversion

Tedeschi

Molinas

2010

2010 IEEE International Symposium on Industrial Electronics

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In Wave Energy Converters (WECs) the maximum power extraction would be achievable at the expense of a very high rating of the electric and power electronics equipment. The goal of this paper is to show how a convenient trade-off between high power extraction and viable electrical device ratings can be achieved by a proper choice of the WEC control strategy. The case of a direct coupled point absorber in heave is considered, in order to show the impact of the most common control strategies on the power performance. Consequently a revised approach to WEC control is proposed, which is simple and takes into account these potentially conflicting requirements. The targeted application of the presented tool is at the design stage of the power take off, but it also offers a reference-case control principle that can be conveniently adapted to improve the device exploitation when working in real sea conditions. Theoretical analysis and computer simulations are used to show the validity of the proposed approach.

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“…Wave energy is deemed to be one of the most promising renewable energy resources, with an estimated global potential of 2 TW [1]. The first attempts to harness wave energy dates back to 1940s, however, serious governmental projects on wave energy have started after the oil crisis in 1973 [2].…”

Section: Introductionmentioning

confidence: 99%

“…The first attempts to harness wave energy dates back to 1940s, however, serious governmental projects on wave energy have started after the oil crisis in 1973 [2]. Apart from being abundant, wave energy is a concentrated form of solar energy, with power density of approximately 2 kW/m 2 [1]. Wave energy converters (WEC) are used to convert the mechanical power of the traveling sea waves to electrical power that can be fed to the grid.…”

Section: Introductionmentioning

confidence: 99%

An Intelligent Fuzzy Logic Controller for Maximum Power Capture of Point Absorbers

et al. 2014

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This article presents an intelligent fuzzy logic controller (FLC) for controlling single-body heaving wave energy converter (WEC) or what is widely known as "Point Absorber". The controller aims at maximizing the energy captured from the sea waves. The power take-off (PTO) limitations are addressed implicitly in the fuzzy inference system (FIS) framework. In order to enhance the WEC power capturing bandwidth and make it less susceptible to wave environment irregularities and the system parametric uncertainties, the controller is built to have a self-configurable capability. This also eliminates the need to repeatedly run in-situ tuning procedure of the fuzzy controller or switch between several controllers based on the operating conditions. The fuzzy membership functions (MFs) are optimally tuned using particle swarm optimization (PSO) algorithm. To alleviate the computational burden associated with performing on-line optimization, the fuzzy controller is tuned at a rate significantly lower than the system sampling time. The suggested PSO-FLC has shown promising results compared with the fixed structure fuzzy logic controller (FS-FLC) and other passive control strategies. Several computer simulations were carried out to evaluate the controller effectiveness by applying different sea-states and analyzing the resultant WEC dynamics.

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Comparison of control strategies performance for a Wave Energy Converter

Cited by 22 publications

References 14 publications

Voltage margin control for offshore multi-use platform integration

Voltage margin control for offshore multi-use platform integration

Impact of control strategies on the rating of electric power take off for Wave Energy conversion

An Intelligent Fuzzy Logic Controller for Maximum Power Capture of Point Absorbers

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