scholarly journals Design of Bilateral Switched Reluctance Linear Generator to Convert Wave Energy: Case Study in Sicily

2013 ◽  
Vol 860-863 ◽  
pp. 1694-1698 ◽  
Author(s):  
Vincenzo Di Dio ◽  
Vincenzo Franzitta ◽  
Daniele Milone ◽  
Salvatore Pitruzzella ◽  
Marco Trapanese ◽  
...  
Keyword(s):  
Wave Energy ◽  
Fem Simulation ◽  
Electrical Energy ◽  
Oscillatory Motion ◽  
Constant Speed ◽  
Variable Speed ◽  
Switched Reluctance ◽  
Linear Generator ◽  
The Law

The aim of this work is a case study of the adaptation bilateral switched reluctance linear generator to the exploitation of energy of the sea. This type of generator can be used to convert wave energy in electrical energy. In this paper we present an analytical sizing and FEM simulation. As for the results, analysis of the data extracted through the simulations it was possible to calculate the emf. The emf was calculated in two cases of motion of the slider: first hypothesis has set the constant speed while the second is a variable speed according to the law of an oscillatory motion of the sea.

Analysis of Electromagnetic Force for the Linear Generator Wave Energy Converters

2015 ◽  
Vol 764-765 ◽  
pp. 418-422
Author(s):  
Peng Huang ◽  
Da Xiao Gao ◽  
Zhong Qiang Zheng ◽  
Xiang Biao Kong ◽  
Zong Yu Chang
Keyword(s):  
Environmental Pollution ◽  
Wave Energy ◽  
Electromagnetic Force ◽  
New Technology ◽  
Electrical Energy ◽  
Small Probability ◽  
Linear Generator ◽  
Wave Energy Converters ◽  
Scientists And Engineers ◽  
First Time

In recent decades environmental pollution and energy crisis have become a challenging task for the scientists and engineers who lead them to innovate new technology and solve this problem by reducing environmental pollution and by exploiting the new source of energy. In this regard wave energy is appeared to be a suitable outcome in order to resolve the current issues. This paper studies and summarizes that the linear generators are considered a device which is used to convert wave energy into electrical energy efficiently. It is the first time to calculate the electromagnetic force by considering the linear generator and at the same time simulated by Ansoft Maxwell software; by providing calculated value and simulated value, it is also verified that the calculated result is accurate with a small probability error as compared to software calculated value.

scholarly journals Design and performance analysis of wave linear generator with parallel mechanism

2021 ◽  
Vol 12 (1) ◽  
pp. 405-417
Author(s):  
Tao Yao ◽  
Yulong Wang ◽  
Zhihua Wang ◽  
Can Qin
Keyword(s):  
Wave Energy ◽  
Inverse Kinematics ◽  
Parallel Mechanism ◽  
Wave Motion ◽  
Electrical Energy ◽  
Vector Method ◽  
Linear Generator ◽  
Flux Intensity ◽  
And Performance ◽  
Electromagnetic Performance

Abstract. Considering the irregularity of wave motion, a wave energy converter (WEC) based on 6-UCU parallel mechanism has been investigated. A buoy connected to moving platform is used to harvest wave energy. Each chain is equipped with the linear generator of the same structure, which can convert the absorbed wave energy into electrical energy. Based on the inverse kinematics analysis of parallel mechanism, the position of the parallel mechanism is solved by using the space closed-loop vector method; the relative motion of stator and translator is obtained. Through electromagnetic numerical simulations, the influences of linear generator parameters such as magnetization mode, air gap, and yoke shape on electromagnetic performance were evaluated. Numerical results show axial magnetization and Halbach magnet array can increase magnetic flux intensity more than radial mode. Furthermore, the rule of electromagnetic resistance is discussed with the change of the speed amplitude and the angle frequency. For a case, dynamic differential equation of the whole system is established. The conversion rate of wave energy is derived.

Design and test of a novel two-body direct-drive wave energy converter

2020 ◽  
pp. 1-18
Author(s):  
Chuan Liu ◽  
Renwen Chen ◽  
Yuxiang Zhang ◽  
Wen Liu ◽  
Liping Wang ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Wave Energy ◽  
Fem Simulation ◽  
Wave Theory ◽  
Wave Energy Converter ◽  
Linear Wave ◽  
Direct Drive ◽  
Energy Converter ◽  
Motion Equations ◽  
Linear Generator

As a renewable energy, ocean wave energy is exploited with infinite potential to solve the energy crisis. In this study, we develop a novel two-body direct-drive wave energy converter (DD-WEC) to surmount the problems associated with low power density, low direct-drive speed of the buoys, seawater corrosion and maintenance in the existing two-body WEC. Its prototype consists of two cylindrical buoys are utilized that float horizontally at sea level and the Halbach permanent magnet linear generator (HPMLG) that is employed in the power take-off (PTO) system. The energy is extracted from the relative motion between two buoys oscillating. Compared with the existing WEC, the proposed WEC has more vigorous motion between buoys, higher conversion efficiency and little extra underwater structure, due to the utilization of the horizontal buoys and the HPMLG. First, the motion equations of buoys are derived on the basis of linear wave theory. And depending on the motion equations, the structure of buoys and the HPMLG is designed. And we found that compared with the existing WEC, the proposed WEC has more vigorous motion between buoys in the seawater waves oscillation. Then, based on finite-element method (FEM), the performance of the HPMLG is evaluated, and it can generate 19% more power than the traditional permanent magnet linear generator (TPMLG) based on the same wave motion. Finally, the DD-WEC prototype is manufactured based on the designed parameter. The manufactured prototype is tested in the test platform and the wave tank. The measured output voltage is highly consistent with the observed variation trends in FEM simulation data. The results show that the proposed DD-WEC is well suited for wave energy conversion.

Analysis, Design, and Evaluation of the UC-Berkeley Wave-Energy Extractor

2010 ◽  
Author(s):  
Ronald W. Yeung ◽  
Antoine Peiffer ◽  
Nathan Tom ◽  
Tomasz Matlak
Keyword(s):  
Wave Energy ◽  
Electrical Energy ◽  
Electromagnetic Properties ◽  
Generator System ◽  
Future Directions ◽  
Strongly Coupled ◽  
Linear Generator ◽  
Ocean Wave Energy ◽  
Theoretical Predictions ◽  
And Performance

This paper evaluates the technical feasibility and performance characteristics of an ocean-wave energy to electrical energy conversion device that is based on a moving linear generator. The UC-Berkeley design consists of a cylindrical floater, acting as a rotor, which drives a stator consisting of two banks of wound coils. The performance of such a device in waves depends on the hydrodynamics of the floater, the motion of which is strongly coupled to the electromagnetic properties of the generator. Mathematical models are developed to reveal the critical hurdles that can affect the efficiency of the design. A working physical unit is also constructed. The linear generator is first tested in a dry environment to quantify its performance. The complete physical floater and generator system is then tested in a wave tank with a computer-controlled wavemaker. Measurements are compared with theoretical predictions to allow an assessment of the viability of the design and future directions for improvements.

Using a Collision Model to Design Safer Wind Turbine Rotors for Birds

1996 ◽  
Vol 118 (4) ◽  
pp. 263-269 ◽  
Author(s):  
V. A. Tucker
Keyword(s):  
Electrical Energy ◽  
Rotor Blades ◽  
Constant Speed ◽  
Safety Index ◽  
Variable Speed ◽  
Collision Model ◽  
Small Constant ◽  
Effect Model ◽  
Order Of Magnitude ◽  
Turbine Rotors

A mathematical model for collisions between birds and propellor-type turbine rotors identifies the variables that can be manipulated to reduce the probability that birds will collide with the rotor. This study defines a safety index—the “clearance power density”—that allows rotors of different sizes and designs to be compared in terms of the amount of wind energy converted to electrical energy per bird collision. The collision model accounts for variations in wind speed during the year and shows that for model rotors with simple, one-dimensional blades, the safety index increases in proportion to rotor diameter, and variable speed rotors have higher safety indexes than constant speed rotors. The safety index can also be increased by enlarging the region near the center of the rotor hub where the blades move slowly enough for birds to avoid them. Painting the blades to make them more visible might have this effect. Model rotors with practical designs can have safety indexes an order of magnitude higher that those for model rotors typical of the constant speed rotors in common use today. This finding suggests that redesigned rotors could have collision rates with birds perhaps an order of magnitude lower than today’s rotors, with no reduction in the production of wind power. The empirical data that exist for collisions between raptors, such as hawks and eagles, and rotors are consistent with the model: the numbers of raptor carcasses found beneath large variable speed rotors, relative to the numbers found under small constant speed rotors, are in the proportions predicted by the collision model rather than in proportion to the areas swept by the rotor blades. However, uncontrolled variables associated with these data prevent a stronger claim of support for the model.

scholarly journals Analysis of the Oceanic Wave Dynamics for Generation of Electrical Energy Using a Linear Generator

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Omar Farrok ◽  
Md. Rabiul Islam ◽  
Md. Rafiqul Islam Sheikh
Keyword(s):  
Magnetic Flux ◽  
Wave Energy ◽  
Electrical Energy ◽  
Ocean Waves ◽  
Wave Dynamics ◽  
Linear Generator ◽  
Oceanic Wave ◽  
Wave Conditions ◽  
Force Components ◽  
Sea Wave

Electricity generation from oceanic wave depends on the wave dynamics and the behavior of the ocean. In this paper, a permanent magnet linear generator (PMLG) has been designed and analyzed for oceanic wave energy conversion. The proposed PMLG design is suitable for the point absorber type wave energy device. A mathematical model of ocean wave is presented to observe the output characteristics and performance of the PMLG with the variation of ocean waves. The generated voltage, current, power, applied force, magnetic flux linkage, and force components of the proposed PMLG have been presented for different sea wave conditions. The commercially available software package ANSYS/ANSOFT has been used to simulate the proposed PMLG by the finite element method. The magnetic flux lines, flux density, and field intensity of the proposed PMLG that greatly varies with time are presented for transient analysis. The simulation result shows the excellent features of the PMLG for constant and variable speeds related to wave conditions. These analyses help to select proper PMLG parameters for better utilization of sea wave to maximize output power.

scholarly journals Modeling electricity supply in a small island: A case study in Sebira island, Indonesia

2021 ◽  
Vol 927 (1) ◽  
pp. 012014
Author(s):  
Ahmad Vidura ◽  
Adil Fajar Widrian ◽  
Nyimas Aljaniah Zahra ◽  
Muhammad Fakhruddin ◽  
Yanif Dwi Kuntjoro
Keyword(s):  
Wave Energy ◽  
Power Plants ◽  
Electrical Energy ◽  
Flow Diagram ◽  
Small Island ◽  
Electricity Supply ◽  
Thousand Islands ◽  
Solar Power Plants ◽  
Stock Flow

Abstract Sebira is a small island located at the northernmost of the Thousand Islands, Indonesia. The Electricity supply at the island uses an isolated network system for its territory. This study aims to model a system of electrical energy supply in Sebira Island. We explore literature studies related to the electricity supply system to support our model to be more representative. We then describe the system with a Causal Loop Diagram and a Stock Flow Diagram. The current electricity supply comes from solar power plants 400 kWp and three units diesel power plants with capacities of 125 kVA (2 units) and 250 kVA (1 unit). In this model, we consider the variables of population growth, initial investment, electricity shortages, fuel costs, profits, and margins. Furthermore, we create two scenarios in the simulation, with and without additional wave energy. The results show that in a sufficiently long period, the second scenario (with extra wave energy) is more profitable for the electricity supply in Sebira Island; however, it requires more initial investment than the first scenario.

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