Support Structure Design and Optimization of Tidal Current Energy Conversion System

2012 ◽  
Vol 14 (1) ◽  
pp. 171-174
Author(s):  
Ke Sun ◽  
Jianhua Zhang ◽  
Yiduo Ai
Keyword(s):  
Energy Conversion ◽  
Tidal Current ◽  
Structure Design ◽  
Support Structure ◽  
Tidal Current Energy ◽  
Design And Optimization ◽  
Conversion System ◽  
Energy Conversion System ◽  
Current Energy

Analysis for a Support Structure of a Horizontal Axial Tidal Current Energy Conversion System

2011 ◽  
Vol 138-139 ◽  
pp. 62-67
Author(s):  
Liang Zhang ◽  
Pei Ge ◽  
Yao Gang Sun ◽  
Feng Mei Jin ◽  
Xiao Hang Wang
Keyword(s):  
Energy Conversion ◽  
Tidal Current ◽  
Research Work ◽  
Tidal Energy ◽  
Support Structure ◽  
Tidal Current Energy ◽  
Conversion System ◽  
Energy Conversion System ◽  
Current Energy ◽  
Base Structure

This paper presents a support structure for gravity-based horizontal axial tidal current energy conversion system considering factors such as strength, reliability, and costs of transportation and installation, etc. The support structure is an important part which directly affects the operation of tidal energy conversion system. ANSYS Workbench is used to determine stress and deformation of the structure subjected to current loads, wave hydrodynamic loads and inertia loads. Nonlinear contacts effects between framework and base structure are taken into account in our calculation. In order to facilitate offshore installation of framework and base structure, some work is done to explore the effects of contact height between internal and external tube and wall thickness of internal tube to the strength. The results show that the strength and stiffness of support structure comply with the design requirements, and the research work provides a valuable reference for the development of harnessing of tidal energy.

Research on Support Structures of a Horizontal Axial Tidal Current Energy Conversion System

2011 ◽  
Vol 105-107 ◽  
pp. 918-921
Author(s):  
Ke Sun ◽  
Pei Ge ◽  
Liang Zhang ◽  
Yao Gang Sun
Keyword(s):  
Energy Conversion ◽  
Numerical Simulations ◽  
Tidal Current ◽  
Research Work ◽  
Tidal Energy ◽  
Support Structures ◽  
Tidal Current Energy ◽  
Conversion System ◽  
Energy Conversion System ◽  
Current Energy

Three support structures with different configurations have been selected to be presented in this paper. Through numerical simulations of structures subjected to current loads, wave hydrodynamic loads and inertia loads, some useful results are gained. The results show that first scheme is simple but stress is largest of all, and second scheme is reasonable for the loads are transferred effectively, and third scheme is less stable. Thus research work provides a valuable reference for harnessing of tidal energy.

scholarly journals Design of Special Plastic Bearings and Their Application in Renewable Energy Conversion System

2015 ◽  
Vol 9 (1) ◽  
pp. 203-209
Author(s):  
Yongjun Dong ◽  
Wanqiang Zhu ◽  
Xueming Zhang ◽  
Jingfu Guo
Keyword(s):  
Renewable Energy ◽  
Energy Conversion ◽  
Tidal Current ◽  
Power Level ◽  
Energy Generation ◽  
Operational Reliability ◽  
Tidal Current Energy ◽  
Conversion System ◽  
Energy Conversion System ◽  
Renewable Energy Generation

To improve the operational reliability of renewable energy conversion system, high-performance polymers and engineering plastics are used to make some parts and components of the energy conversion device, especially in the marine renewable energy generation field. In this article, special plastic bearings based on the material of polyoxymethylene (POM) were designed and applied in the power generation device of both tidal current energy and island wind energy. The properties of POM were analyzed, and the load of a POM ball was tested. Special structures of the plastic bearings were designed to meet the requirements of pressure resistance and to reduce the friction. These plastic bearings had been used in the prototypes of 20 kW tidal current turbine generation device and 15 kW island wind turbine generation device. According to the prototypes’ operation, the results indicate that these plastic bearings work well and are very suitable for the application in renewable energy conversion system. By optimizing the structure, such plastic bearings would be generalized and applied in the renewable energy generation device with a higher power level.

scholarly journals An FTC Design via Multiple SOGIs with Suppression of Harmonic Disturbances for Five-Phase PMSG-Based Tidal Current Applications

2021 ◽  
Vol 9 (6) ◽  
pp. 574
Author(s):  
Zhuo Liu ◽  
Tianhao Tang ◽  
Azeddine Houari ◽  
Mohamed Machmoum ◽  
Mohamed Fouad Benkhoris
Keyword(s):  
Fault Tolerance ◽  
Energy Conversion ◽  
Tidal Current ◽  
Fault Tolerant ◽  
Tidal Current Energy ◽  
Electromagnetic Forces ◽  
Model Free ◽  
Energy Conversion Systems ◽  
Power Scale ◽  
Current Energy

This paper firstly adopts a fault accommodation structure, a five-phase permanent magnet synchronous generator (PMSG) with trapezoidal back-electromagnetic forces, in order to enhance the fault tolerance of tidal current energy conversion systems. Meanwhile, a fault-tolerant control (FTC) method is proposed using multiple second-order generalized integrators (multiple SOGIs) to further improve the systematic fault tolerance. Then, additional harmonic disturbances from phase current or back-electromagnetic forces in original and Park’s frames are characterized under a single-phase open condition. Relying on a classical field-oriented vector control scheme, fault-tolerant composite controllers are then reconfigured using multiple SOGIs by compensating q-axis control commands. Finally, a real power-scale simulation setup with a gearless back-to-back tidal current energy conversion chain and a small power-scale laboratory prototype in machine side are established to comprehensively validate feasibility and fault tolerance of the proposed method. Simulation results show that the proposed method is able to suppress the main harmonic disturbances and maintain a satisfactory fault tolerance when third harmonic flux varies. Experimental results reveal that the proposed model-free fault-tolerant design is simple to implement, which contributes to better fault-tolerant behaviors, higher power quality and lower copper losses. The main advantage of the multiple SOGIs lies in convenient online implementation and efficient multi-harmonic extractions, without considering system’s model parameters. The proposed FTC design provides a model-free fault-tolerant solution to the energy harvested process of actual tidal current energy conversion systems under different working conditions.

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