An Analytical Approach to Modeling of Motion-Response of Floating Structure for Ocean Renewable Energy Conversion System

2018 ◽  
Vol 874 ◽  
pp. 44-49
Author(s):  
Sony Junianto ◽  
Rudi Walujo Prastianto ◽  
Mukhtasor
Keyword(s):  
Renewable Energy ◽  
Energy Conversion ◽  
Ocean Energy ◽  
Floating Structure ◽  
Motion Response ◽  
Ocean Renewable Energy ◽  
Lagrange Formula ◽  
Conversion System ◽  
Energy Conversion System ◽  
The Stability

Ocean renewable energy research has been progressing well. Supporting structures are needed to convert energy from the sea. This paper discusses the response of the floating structure for ocean renewable energy conversion system by providing a simple design of floating structure. Due to its function, the system is limited for the pitching motion. By using the Lagrange formula, the equation of motion of the system can be obtained. In the analysis, there are three variations of wave period to determine the response of floating structure motion. The result shows the trend where the larger wave periods induce larger intersection angle (larger response) of the structure. The floating structure configuration for the ocean energy converter should be determined in such a way that have the most stable motion-response in any condition. The stability of floating structure will affect the current forces in the rotated turbine. It needs a specific design to hold the stability of floating structure.

scholarly journals Stability Analysis and Optimization of Wind Energy Conversion System Using Extremum Seeking Output Feedback Controller for Dynamic Wind Speed Variations

2018 ◽  
Vol 7 (4.10) ◽  
pp. 963
Author(s):  
M. B.Hemanth Kumar ◽  
B. Saravanan
Keyword(s):  
Renewable Energy ◽  
Wind Energy ◽  
Energy Conversion ◽  
Feedback Controller ◽  
Electrical Network ◽  
Wind Energy Conversion System ◽  
Wind Energy Conversion ◽  
Linear Feedback Controller ◽  
Conversion System ◽  
Energy Conversion System

Stability of power systems is an important aspect for interconnecting different renewable energy sources into the existing electrical network. The concern over environmental effects due to conventional power plant made the researchers to implement many solutions for introducing renewable energy due to their intermittent nature. When the wind energy conversion system is introduced into the grid there’s need of voltage and frequency control for maintaining reactive power demand and also many issues from the consumer end and also it must satisfy the grid standards. As the wind is dynamic in nature there are issues like stability, load imbalance, power quality and other issues. In this paper, a non-linear feedback controller is introduced based on field-oriented control (FOC) approach and simulated in MATLAB environment. The designed controller is tested for wind data for examining the stability and power coefficient for the wind turbine. This controller also achieves fast transient response for rapid changes in the wind profile.  

scholarly journals Novel Nonlinear Control and Optimization Strategies for Hybrid Renewable Energy Conversion System

2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Z. Jai Andaloussi ◽  
A. Raihani ◽  
A. El Magri ◽  
R. Lajouad ◽  
A. El Fadili
Keyword(s):  
Renewable Energy ◽  
Energy Conversion ◽  
Control Strategy ◽  
Reactive Power ◽  
Sliding Mode ◽  
Voltage Regulation ◽  
Lyapunov Theory ◽  
Conversion System ◽  
Energy Conversion System ◽  
Hybrid Renewable Energy

This article deals with a hybrid renewable energy conversion system (HRECS) interconnected to the three-phase grid in association with their power conversion components, i.e., AC/DC rectifier and DC/AC inverter. The HRECS is built around a permanent magnet synchronous wind turbine generator and a photovoltaic energy conversion system. Comparing to traditional control methods, a new multiobjective control strategy is developed to enhance system performances. This makes it possible to account in addition to optimal turbine speed regulation and PV-MPPT and three other important control objectives such as DC-link voltage regulation and the injected reactive power in the grid. To achieve these objectives, a novel control strategy is developed, based on a nonlinear model of the whole “converters-generators” association. The robustness and the stability analysis of the system have been proved using the Lyapunov theory and precisely the backstepping control and the sliding mode control. The performances of the proposed controllers are formally analyzed with respect to standard control solutions illustrated through simulation.

scholarly journals Electrical control strategy for an ocean energy conversion system

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Muhammad Noman ◽  
Guojie Li ◽  
Keyou Wang ◽  
Bei Han
Keyword(s):  
Power Generation ◽  
Adaptive Control ◽  
Energy Conversion ◽  
Control Strategy ◽  
Control Strategies ◽  
Robust Adaptive Control ◽  
Ocean Energy ◽  
Conversion System ◽  
Non Linear ◽  
Energy Conversion System

AbstractGlobally abundant wave energy for power generation attracts ever increasing attention. Because of non-linear dynamics and potential uncertainties in ocean energy conversion systems, generation productivity needs to be increased by applying robust control algorithms. This paper focuses on control strategies for a small ocean energy conversion system based on a direct driven permanent magnet synchronous generator (PMSG). It evaluates the performance of two kinds of control strategies, i.e., traditional field-oriented control (FOC) and robust adaptive control. The proposed adaptive control successfully achieves maximum velocity and stable power production, with reduced speed tracking error and system response time. The adaptive control also guarantees global system stability and its superiority over FOC by using a non-linear back-stepping control technique offering a better optimization solution. The robustness of the ocean energy conversion system is further enhanced by investigating the Lyapunov method and the use of a DC-DC boost converter. To overcome system complexity, turbine-generator based power take-off (PTO) is considered. A Matlab/Simulink study verifies the advantages of a non-linear control strategy for an Oscillating Water Column (OWC) based power generation system.

Sign in / Sign up

Export Citation Format

Share Document