Analysis of a Horizontal-Axis Tidal Turbine Performance in the Presence of Regular and Irregular Waves Using Two Control Strategies

Ordóñez-Sánchez, Stephanie; Allmark, Matthew; Porter, Kate; Ellis, Robert; Lloyd, Catherine; Santic, Ivan; O'Doherty, Timothy; Johnstone, Cameron

doi:10.3390/en12030367

Cited by 40 publications

(54 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Opposite to that, the energy transformation process is inverted for the needs of the model tests. The wave maker consumes electricity to generate waves and model the environmental conditions in the hydromechanics laboratories [3][4][5][6]. Thus, the z A in (4) and the z A i in ( 6) are associated with the movements of the wave maker actuator, in accordance with the formulations ( 1) and (2).…”

Section: Energy Transformationmentioning

confidence: 99%

“…The full-scale prediction, based on the reduced-scale model tests, is justified under the similitude, pursuant to the Buckingham theorem [2]. This kind of model test is performed in hydromechanics laboratories worldwide [3][4][5][6]. It finally improves the maritime safety and survivability of naval, offshore and onshore constructions as well as improving their performance.…”

Section: Introductionmentioning

confidence: 99%

“…h 0 is the level of the hinge above the bottom. k is associated with the harmonic frequency via the dispersion relation (3).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fuzzy Control of Waves Generation in a Towing Tank

Drzewiecki

Guziński

2020

Energies

View full text Add to dashboard Cite

This paper presents the results of research related to the transformation of electrical energy into potential and kinetic energy of waves generated on the water surface. The waves are generated to model the environmental conditions for the needs of the model tests. The model tests are performed on model-scale objects to predict the features of full-scale maritime objects. It is done to improve human safety and the survivability of constructions. Electrical energy is transformed into the energy of the water waves using a wave maker. The wave maker considered is a facility with an electrohydraulic drive and an actuator submerged into the water. The actuator movement results in the waves being mechanically-generated in accordance with the wave maker theory. The study aimed to investigate the advantage of the newly implemented fuzzy-logic controller over the hitherto cascading proportional-integral controllers of the wave maker actuator. The research was focused on experimental investigation of the transformation process outcomes harvested under the fuzzy-logic controller, versus the cascading proportional-integral controllers. The waves were generated and measured in the real towing tank, located in the Maritime Advanced Research Centre (CTO S.A.). The investigation confirmed the advantage of the fuzzy-logic controller. It provides more accurate transformation of energy into the desired form of the water waves of specified parameters—frequency and amplitude—and more flat amplitude-frequency characteristic of the transformation process.

show abstract

Section: Energy Transformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fuzzy Control of Waves Generation in a Towing Tank

Drzewiecki

Guziński

2020

Energies

View full text Add to dashboard Cite

show abstract

“…The other non-dimensional parameters which are required for performance analysis of HATCT are C t and C T . These parameters can be described through the following equations [35,49]:…”

Section: Hatct Performance Indicatorsmentioning

confidence: 99%

On the Performance of Small-Scale Horizontal Axis Tidal Current Turbines. Part 1: One Single Turbine

et al. 2020

View full text Add to dashboard Cite

The blade number of a current tidal turbine is one of the essential parameters to increase the stability, performance and efficiency for converting tidal current energy into rotational energy to generate electricity. This research attempts to investigate the effect of blade number on the performance of a small-scale horizontal tidal current turbine in the case of torque, thrust coefficient and power coefficient. Towards this end and according to the blade element momentum theory, three different turbines, i.e., two, three and four-bladed, were modeled using Solidworks software based on S-814 airfoil and then exported to the ANSYS-FLUENT for computational flow dynamics (CFD) analysis. SST-K-ω turbulence model was used to predict the turbulence behavior and several simulations were conducted at 2 ≤ tip speed ratio ≤ 7. Pressure contours, turbulence kinetic energy contours, cut-in-speed-curves, and streamlines around the blades and rotors were extracted and compared to provide an ability for a deep discussion on the turbine performance. The results show that in the case of obtainable power, the optimal value of tip speed ratio is around 5, so that the maximum power was achieved for the four-bladed turbine. Out of optimal condition, higher blade number and lower blade number turbines should be used at less than and greater than the optimal values of tip speed ratio, respectively. The results of simulations for the three-bladed turbine were validated against the experimental data with good agreement.

show abstract

“…Guo et al (2018), Payne et al (2018), Martinez et al (2018)], and is used in this current study, consideration must be given to the likely full-scale control strategy. For example, preliminary studies on tidal turbine control show that the implementation of torque control could significantly alter the expected peak thrust (Ordonez-Sanchez et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Experimental assessment of tidal turbine loading from irregular waves over a tidal cycle

Draycott

Steynor

Nambiar

et al. 2019

J. Ocean Eng. Mar. Energy

View full text Add to dashboard Cite

Waves interact with currents in tidal channels with the resulting wave-current environment largely determining the loads experienced by tidal stream turbines. Over a tidal cycle, the magnitude and direction of the current velocity changes and hence so does the combined wave-current conditions the turbines must operate within. Here we demonstrate this effect experimentally, generating a realistic irregular wave case in both following (in the same direction as the waves) and opposing currents prior to assessing the resulting loads on a fully instrumented 1:15 scale tidal turbine model aligned with the current direction. Large changes in the environmental conditions, along with the turbine performance and loads, are demonstrated through the presentation of temporal, spectral and statistical outputs. The experimental results demonstrate that the full-scale equivalent significant wave height changes from 2.25 m in zero current to 6.11 m in 3.2 m/s opposing current and 1.56 m in 3.2m/s following current. The corresponding standard deviations of measured turbine parameters for the opposing condition range between 215 and 260% of the following case, and between 340 and 565% of the current-only measurements. Hence, when waves are present, significantly greater fatigue damage will be accumulated during one-half of the tidal cycle. The mean values, however, appear to be unaffected by the presence of waves suggesting that the overall turbine performance is unaltered. These results demonstrate the requirement to understand the combined wave-current environment and to test and de-risk tidal stream turbines for operation in both following and opposing wave-current conditions. Significant additional insight is gained into the nature of loads experienced by tidal turbines in irregular wave conditions, a scarcely documented phenomenon.

show abstract

Analysis of a Horizontal-Axis Tidal Turbine Performance in the Presence of Regular and Irregular Waves Using Two Control Strategies

Cited by 40 publications

References 15 publications

Fuzzy Control of Waves Generation in a Towing Tank

Fuzzy Control of Waves Generation in a Towing Tank

On the Performance of Small-Scale Horizontal Axis Tidal Current Turbines. Part 1: One Single Turbine

Experimental assessment of tidal turbine loading from irregular waves over a tidal cycle

Contact Info

Product

Resources

About