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.

scholarly journals An Active FTC Strategy Using Generalized Proportional Integral Observers Applied to Five-Phase PMSG based Tidal Current Energy Conversion Systems

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6645
Author(s):  
Zhuo Liu ◽  
Azeddine Houari ◽  
Mohamed Machmoum ◽  
Mohamed-Fouad Benkhoris ◽  
Tianhao Tang
Keyword(s):  
Energy Conversion ◽  
Tidal Current ◽  
Fault Tolerant ◽  
Current Control ◽  
Small Scale ◽  
Sigmoid Function ◽  
Tidal Current Energy ◽  
Proportional Integral ◽  
Energy Conversion Systems ◽  
Current Energy

In recent years, multi-phase permanent magnet synchronous generators (PMSGs) have become attractive in the field of tidal current energy conversion systems (TCECS) due to their high-power density, reliability, and availability. However, external disturbances and malfunctions in power conversion chains will bring challenges to achieving stable and continuous tidal current energy harnessing. Using generalized proportional integral observers, an active fault-tolerant control (AFTC) strategy is therefore proposed for a five-phase PMSG based TCECS that is subjected to an open switch fault (OSF) in the generator side converter. This proposed AFTC strategy is applied into q-axis current control loops, which contain fault detection and compensation. The fault compensator will be smoothly activated using a sigmoid function once the OSF is detected. Finally, a small-scale power experimental platform emulating the TCECS is established in order to verify the feasibility and efficiency of the proposed FTC strategy. Experiment results show that this AFTC strategy can detect faults rapidly and effectively attenuate torque ripples in the post-fault operation mode.

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.

Simulation of a Biomimetic Tidal Current Energy Conversion Device

2006 ◽  
Author(s):  
T. Finnigan
Keyword(s):  
Fluid Dynamics ◽  
Energy Conversion ◽  
Tidal Current ◽  
Development Process ◽  
Low Cost ◽  
Aquatic Species ◽  
Tidal Current Energy ◽  
Simulation Results ◽  
Cost Efficient ◽  
Current Energy

Aquatic species have evolved highly efficient modes of swimming through natural selection. The most efficient in terms of forward thrust are Thunniform-mode swimming species (eg. tuna, shark). These species are propelled by lateral oscillation of a stiff lunate caudal fin with motion primarily limited to the fin and peduncle (aft tail) regions. In this paper we describe the application of biomimicry to the use of swimming hydromechanics in the development of a new tidal current energy conversion device. The development process is briefly described and some preliminary simulation results, based on computational fluid dynamics, are presented. Results indicate that potential exists for the development of low-cost efficient devices based on the biomimetic concept.

On Offshore Engineering Rules for Designing Floating Structure of Tidal Current Energy Conversion System

2018 ◽  
Vol 874 ◽  
pp. 71-77 ◽  
Author(s):  
Mukhtasor ◽  
Sony Junianto ◽  
Rudi Walujo Prastianto
Keyword(s):  
Energy Conversion ◽  
Tidal Current ◽  
Industrial Development ◽  
Material Selection ◽  
Response Analysis ◽  
Floating Structure ◽  
Tidal Current Energy ◽  
Offshore Area ◽  
Offshore Engineering ◽  
Current Energy

Offshore engineering rules have been important part in supporting industrial development of tidal current energy conversion (TCEC) systems. The rules have been considered as guidelines for design of fixed type of TCEC systems, particularly those provided by European Marine Energy Centre (EMEC). However, for floating type of TCEC system, this is not the case. In fact, floating systems have a potential application for particular area of interests, for example in the area with strong currents at the seawater surface or in that with minimal infrastructure for installation support. In future, floating TCEC systems might be installed at the offshore area, even though the current application is commonly at the nearshore. Therefore, it may be beneficial to adopt relevant aspects of the offshore engineering rules for the floating structure design to support TCEC systems. This paper identifies elemental rules which may be suitable for application in the design of this type of floating structure. It includes choice of configurations, dynamic response analysis, material selection, mooring-water depth analyses and removal. This work is an important part of the whole big effort in supporting the development of ocean renewable energy industries.

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