scholarly journals Overview of modelling and control strategies for wind turbines and wave energy devices: Comparisons and contrasts

2015 ◽  
Vol 40 ◽  
pp. 27-49 ◽  
Author(s):  
J.V. Ringwood ◽  
S. Simani
Keyword(s):  
Wind Turbines ◽  
Wave Energy ◽  
Control Strategies ◽  
Energy Devices ◽  
And Control

Study on a global control strategy for rotation speed with different work states in variable-speed constant-frequency wind turbines

2011 ◽  
Vol 225 (7) ◽  
pp. 968-976 ◽  
Author(s):  
G Zheng ◽  
H Xu ◽  
X Wang ◽  
J Zou
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Control Strategy ◽  
Control Strategies ◽  
Stable Operation ◽  
Constant Frequency ◽  
Global Control ◽  
Control Rules ◽  
The Individual ◽  
And Control

This paper studies the operation of wind turbines in terms of three phases: start-up phase, power-generation phase, and shutdown phase. Relationships between the operational phase and control rules for the speed of rotation are derived for each of these phases. Taking into account the characteristics of the control strategies in the different operational phases, a global control strategy is designed to ensure the stable operation of the wind turbine in all phases. The results of simulations are presented that indicate that the proposed algorithm can control the individual phases when considered in isolation and also when they are considered in combination. Thus, a global control strategy for a wind turbine that is based on a single algorithm is presented which could have significant implications on the control and use of wind turbines.

Overview on Oscillating Water Column Devices

2022 ◽  
Author(s):  
A.F.O. Falcão
Keyword(s):  
Water Column ◽  
Wave Energy ◽  
Important Class ◽  
Oscillating Water Column ◽  
Energy Converter ◽  
Energy Devices ◽  
New Concepts ◽  
Testing Techniques ◽  
Fixed Structure ◽  
And Control

Abstract. Oscillating-water-column (OWC) converters, of fixed structure or floating, are an important class of wave energy devices. A large part of wave energy converter prototypes deployed so far into the sea are of OWC type. The paper presents a review of recent advances in OWC technology, including sea-tested prototypes and plants, new concepts, air turbines, model testing techniques and control.

scholarly journals An Iterative Refining Approach to Design the Control of Wave Energy Converters with Numerical Modeling and Scaled HIL Testing

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2508
Author(s):  
Nicola Delmonte ◽  
Eider Robles ◽  
Paolo Cova ◽  
Francesco Giuliani ◽  
François Xavier Faÿ ◽  
...  
Keyword(s):  
Power Electronics ◽  
Wave Energy ◽  
Control Strategies ◽  
Low Cost ◽  
Design Stage ◽  
Control Laws ◽  
General Validity ◽  
Early Design Stage ◽  
Wave Flume ◽  
And Control

The aim of this work is to show that a significant increase of the efficiency of a Wave Energy Converter (WEC) can be achieved already at an early design stage, through the choice of a turbine and control regulation, by means of an accurate Wave-to-Wire (W2W) modeling that couples the hydrodynamic response calibrated in a wave flume to a Hardware-In-the-Loop (HIL) test bench with sizes and rates not matching those of the system under development. Information on this procedure is relevant to save time, because the acquisition, the installation, and the setup of a test rig are not quick and easy. Moreover, power electronics and electric machines to emulate turbines and electric generators matching the real systems are not low-cost equipment. The use of HIL is important in the development of WECs also because it allows the carrying out of tests in a controlled environment, and this is again time- and money-saving if compared to tests done on a real system installed at the sea. Furthermore, W2W modeling can be applied to several Power Take-Off (PTO) configurations to experiment different control strategies. The method here proposed, concerning a specific HIL for testing power electronics and control laws for a specific WECs, may have a more general validity.

Mooring Integrity in Electrification Projects - Learning from the Floating Production Sector in Early Years of Harsh Environment Operations

2021 ◽  
Author(s):  
Nigel J. Robinson ◽  
Scott M. Rosie
Keyword(s):  
Risk Assessment ◽  
Wind Turbines ◽  
Wave Energy ◽  
Early Years ◽  
Production Sector ◽  
Energy Devices ◽  
Wave Energy Converters ◽  
Qualitative Risk Assessment ◽  
Floating Offshore Wind Turbines ◽  
Energy Converters

Abstract There is a growing interest in electrification of offshore production assets using renewable energy devices. Typical configurations have arrays of power generating devices, located a short distance away from the platform and linked by subsea cables. To date, floating offshore wind turbines and wave energy converters have been trialed as sources of electrical power. With hulls, moorings and cables set out in close proximity, there is a unique station keeping risk profile that needs to be managed, to ensure fitness for service through the life of the field. When developing electrification schemes, there is a body of relevant research that can be accessed to help identify and control mooring risks. In the early days of North Sea floating production, the industry encountered multiple instances of accelerated mooring line degradation. The causes and mitigations were researched through joint industry projects, leading to the publication of operating guidance through OGUK, the HSE, ISO and others. This guidance, along with a series of milestone papers, offers a valuable body of learning that is available to electrification projects. In this paper, the authors survey the integrity threats and challenges affecting moorings in electrification schemes that are based around small arrays of wind turbines or wave energy converters. Through qualitative risk assessment, comparison is made to mooring integrity issues in the floating production sector. The relevance of guidance from oil and gas is reviewed. Consideration is given to the consequences of a line failure, and how in some cases these may represent intolerable risks. It is argued that a through-life integrity risk assessment is essential for successful deployments; also, that existing OGUK guidance on mooring integrity be extended, to reflect the specifics of electrification projects.

scholarly journals Special issue on wind turbines and wave energy devices

2015 ◽  
Vol 40 ◽  
pp. 25-26
Author(s):  
John V. Ringwood ◽  
Silvio Simani
Keyword(s):  
Wind Turbines ◽  
Wave Energy ◽  
Special Issue ◽  
Energy Devices

scholarly journals A practical approach to wave energy modeling and control

2020 ◽  
Author(s):  
Ryan G. Coe ◽  
Giorgio Bacelli ◽  
Dominic Forbush
Keyword(s):  
Wave Energy ◽  
Impedance Matching ◽  
Control Design ◽  
Dynamics Modeling ◽  
Control Logic ◽  
Modeling And Control ◽  
Energy Devices ◽  
Fm Radio ◽  
The Cost ◽  
And Control

The potential for control design to dramatically improve the economic viability of wave energy has generated a great deal of interest and excitement. However, for a number of reasons, the promised benefits from better control designs have yet to be widely realized by wave energy devices and wave energy remains a relatively nascent technology. This brief paper summarizes a simple, yet powerful approach to wave energy dynamics modeling, and subsequent control design based on impedance matching. Our approach leverages the same concepts that are exploited by a simple FM radio to achieve a feedback controller for wave energy devices that approaches optimal power absorption. If fully utilized, this approach can deliver immediate and consequential reductions to the cost of wave energy. Additionally, this approach provides the necessary framework for control co-design of a WEC, in which an understanding of the control logic allows for synchronous design of the device control system and hardware.

scholarly journals A STUDY ON POWER OUTPUT OF HORIZONTAL-AXIS WIND TURBINES UNDER RAIN

2019 ◽  
Vol 57 (3) ◽  
pp. 356
Author(s):  
Nguyen Tuan Anh ◽  
Nguyen Huu Duc
Keyword(s):  
Wind Turbines ◽  
Control Strategies ◽  
Horizontal Axis ◽  
Operating Environment ◽  
Physical Processes ◽  
Horizontal Axis Wind Turbines ◽  
Widespread Phenomenon ◽  
Rain Drops ◽  
And Performance ◽  
And Control

The power of the wind turbine are significantly affected by the air conditions of the operating environment. Rain is a widespread phenomenon in many parts of the world especially in Vietnam, so exploring its effect on the power of wind turbines will provide valuable insights into the design of a new wind tower. In this paper, a method and a model is developed to estimate the effect of precipitation by simulating the actual physical processes of the rain drops forming on the surface of the blades of horizontal-axis wind turbines (HAWT), thereby determining optimal wetness, then power and performance respectively. Consequently, it makes a contribution to operation and control strategies for horizontal-axis wind turbines.

scholarly journals Discrete control of resonant wave energy devices

2012 ◽  
Vol 370 (1959) ◽  
pp. 288-314 ◽  
Author(s):  
A. H. Clément ◽  
A. Babarit
Keyword(s):  
Wave Energy ◽  
Control Strategies ◽  
Optimal Operation ◽  
Irregular Waves ◽  
Discrete Control ◽  
Continuous Control ◽  
Sea Waves ◽  
Energy Devices ◽  
Resonant Wave ◽  
Marginal Improvement

Aiming at amplifying the energy productive motion of wave energy converters (WECs) in response to irregular sea waves, the strategies of discrete control presented here feature some major advantages over continuous control, which is known to require, for optimal operation, a bidirectional power take-off able to re-inject energy into the WEC system during parts of the oscillation cycles. Three different discrete control strategies are described: latching control, declutching control and the combination of both, which we term latched–operating–declutched control. It is shown that any of these methods can be applied with great benefit, not only to mono-resonant WEC oscillators, but also to bi-resonant and multi-resonant systems. For some of these applications, it is shown how these three discrete control strategies can be optimally defined, either by analytical solution for regular waves, or numerically, by applying the optimal command theory in irregular waves. Applied to a model of a seven degree-of-freedom system (the SEAREV WEC) to estimate its annual production on several production sites, the most efficient of these discrete control strategies was shown to double the energy production, regardless of the resource level of the site, which may be considered as a real breakthrough, rather than a marginal improvement.

scholarly journals A practical approach to wave energy modeling and control

2020 ◽  
Author(s):  
Ryan G. Coe ◽  
Giorgio Bacelli ◽  
Dominic Forbush
Keyword(s):  
Wave Energy ◽  
Impedance Matching ◽  
Control Design ◽  
Dynamics Modeling ◽  
Control Logic ◽  
Modeling And Control ◽  
Energy Devices ◽  
Fm Radio ◽  
The Cost ◽  
And Control

The potential for control design to dramatically improve the economic viability of wave energy has generated a great deal of interest and excitement. However, for a number of reasons, the promised benefits from better control designs have yet to be widely realized by wave energy devices and wave energy remains a relatively nascent technology. This brief paper summarizes a simple, yet powerful approach to wave energy dynamics modeling, and subsequent control design based on impedance matching. Our approach leverages the same concepts that are exploited by a simple FM radio to achieve a feedback controller for wave energy devices that approaches optimal power absorption. If fully utilized, this approach can deliver immediate and consequential reductions to the cost of wave energy. Additionally, this approach provides the necessary framework for control co-design of a WEC, in which an understanding of the control logic allows for synchronous design of the device control system and hardware.

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