Optimization of Offshore Direct Drive Wind Turbine Generators With Consideration of Permanent Magnet Grade and Temperature

Bhuiyan, Nurul Azim; McDonald, Alasdair

doi:10.1109/tec.2018.2879442

Cited by 46 publications

(7 citation statements)

References 18 publications

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“…For detailed analysis of generators under transients, e.g., in a fault run through, a circuitcoupled FEM can be used to consider the parameter variations caused by electromagnetic nonlinearity. Cooling design of generators requires accurate calculation of losses and temperature rises, which is usually carried out by coupled FEMs or thermal-circuit analysis (Bhuiyan and McDonald, 2018;Kowal et al, 2013). As wind turbines grow in size, the electromagneto-mechanical dynamics of the generator and its associated mechanical components should be analyzed in detail to avoid undesirable vibrations.…”

Section: Modeling and Analysismentioning

confidence: 99%

Wind turbine drivetrains: state-of-the-art technologies and future development trends

et al. 2022

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Abstract. This paper presents the state-of-the-art technologies and development trends of wind turbine drivetrains – the system that converts kinetic energy of the wind to electrical energy – in different stages of their life cycle: design, manufacturing, installation, operation, lifetime extension, decommissioning and recycling. Offshore development and digitalization are also a focal point in this study. Drivetrain in this context includes the whole power conversion system: main bearing, shafts, gearbox, generator and power converter. The main aim of this article is to review the drivetrain technology development as well as to identify future challenges and research gaps. The main challenges in drivetrain research identified in this paper include drivetrain dynamic responses in large or floating turbines, aerodynamic and farm control effects, use of rare-earth material in generators, improving reliability through prognostics, and use of advances in digitalization. These challenges illustrate the multidisciplinary aspect of wind turbine drivetrains, which emphasizes the need for more interdisciplinary research and collaboration.

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Section: Modeling and Analysismentioning

confidence: 99%

Wind turbine drivetrains: state-of-the-art technologies and future development trends

et al. 2022

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“…Furthermore, it is worth noting that the power factor has a considerable impact on the machine side converter rating because the grid side converter is unaffected by the generator power factor. At the same time, the huge size of the direct-drive generator will significantly contribute to the overall mass and cost of the direct-drive powertrain system [179]. Any reduction in size or mass of generator and converter active materials due to higher torque production capability of TFPM machine is going to be beneficial for system-level performance.…”

Section: B Power Electronic Convertersmentioning

confidence: 99%

A Review on Transverse Flux Permanent Magnet Machines for Wind Power Applications

et al. 2020

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Transverse flux permanent magnet (TFPM) machines are a potential candidate for directdrive wind power application due to high torque and power densities. The operating principle of TFPM machines is firstly described with various topologies available in literature, with the placement of magnets as a criterion for the classification of TFPM machine topologies. This review includes characteristics, power factor improvement, cogging torque minimization, material consideration, modelling techniques, and scalability. Different wind turbine concepts with direct-drive machines, control techniques and power converter topologies are also considered in this paper. INDEX Permanent magnet, topologies, transverse flux, and wind power.

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“…These problems result in increased generator manufacturing cost and stronger and expensive tower structure. Therefore, a generator with a high value of torque density is needed in DDWT systems [4]. In wind turbine systems, especially in DDWTs, generator cogging torque is an important criterion that must be taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

Cogging Torque Minimization in Transverse Flux Permanent Magnet Generators using Two-step Axial Permanent Magnet Segmentation for Direct Drive Wind Turbine Application

Nasiri‐Zarandi

Ajamloo

Abbaszadeh

2021

IJE

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Transverse flux permanent magnet machines (TFPMs) are categorized as synchronous machines that benefit from having high value of torque density and capablity of accommodating high pole numbers. These characteristics make TFPMs suitable candidates for low-speed applications where high torque density value is requred such as direct drive wind turbine application. Despite the aforementioned advantages, TFPMs suffer from intrinsically high cogging torque value which is an important concern for wind turbine application. This paper focuses on axial PM segmentation technique to minimized cogging torque of TFPM topologies. Concept of the proposed method is discussed using analytical equations and optimum segmentaion angle is formulized. Non-linear magnetic equivalent circuit (MEC) is adopted where the PM segmentation, armature reaction, rotor transition and iron saturation effect are carefully modeled. The results of the MEC simulation are compared with the finite element method (FEM) results in terms of accuracy and computational time. The results from the analysis indicate that the proposed MEC method is almost ten times faster than FEM with reasonable level of precision. Taguchi method is adopted as a fast-response optimization method to improve the generator torque characteristics. The results show that the cogging torque has reduced by 97% with respect to the initial design while the average torque has only dropped by 8% which is an acceptable side effect due to the significant improvement in machine cogging torque.

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Optimization of Offshore Direct Drive Wind Turbine Generators With Consideration of Permanent Magnet Grade and Temperature

Cited by 46 publications

References 18 publications

Wind turbine drivetrains: state-of-the-art technologies and future development trends

Wind turbine drivetrains: state-of-the-art technologies and future development trends

A Review on Transverse Flux Permanent Magnet Machines for Wind Power Applications

Cogging Torque Minimization in Transverse Flux Permanent Magnet Generators using Two-step Axial Permanent Magnet Segmentation for Direct Drive Wind Turbine Application

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