Thermal design and analysis of a direct-water cooled direct drive permanent magnet synchronous generator for high-power wind turbine application

Polikarpova, M.; Röyttä, Pekka; Alexandrova, J.; Semken, Scott; Nerg, Janne; Pyrhönen, Juha

doi:10.1109/icelmach.2012.6350075

Cited by 14 publications

(4 citation statements)

References 6 publications

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“…Meshing for CFD does not solely rely on the density of mesh for solution improvement, as may be the case for FEA [9]. In CFD, the mesh distribution must also capture geometrical and flow features as well as turbulence modelling requirements.…”

Section: B Cfd Meshingmentioning

confidence: 99%

“…CFD has been commonly been used for airflow modelling of electrical machines for around 15 years [2,6,7] and it is becoming more utilised for conjugate heat transfer modelling [8,9]. Conjugate heat transfer modelling may be used to simultaneously solve conductive and convective heat transfer through neighbouring solid and fluid regions, respectively [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stator and rotor vent modelling in a MVA rated synchronous machine

Connor¹,

Eastwick²,

Pickering

et al. 2016

2016 XXII International Conference on Electrical Machines (ICEM)

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-An investigation into the solution dependence of a conjugate heat transfer computational fluid dynamics (CFD) model of a synchronous generator, with respect to meshing, has been carried out. Utilising CFD as a tool for investigating the airflow and thermal performance of electrical machines is increasing. Meshing is a vital part of the CFD process, but its importance is often misunderstood or overlooked in the context of electrical machine analyses; partly due to the relative mesh independency of the finite element analysis (FEA) numerical method. This paper demonstrates how a relatively complex, aircooled generator CFD model can be considerably influenced by changes in the mesh. Flow rate, velocity and windage effects are assessed as a function of the mesh adopted. Mesh changes have been shown to affect the mass flow rate through a single vent by up to 55% and the associated heat transfer coefficient by 128%.

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Section: B Cfd Meshingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stator and rotor vent modelling in a MVA rated synchronous machine

Connor¹,

Eastwick²,

Pickering

et al. 2016

2016 XXII International Conference on Electrical Machines (ICEM)

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“…Considering the types of generator, for offshore generation, the new significant commercial interest is based on more reliable and powerful permanent magnet synchronous generator (PMSG) [9]. For example Vestas, GE Wind, Goldwind, Siemens and Gamesa have all introduced the generators with the feature of PMSGs intended for offshore [3].…”

Section: Permanent Magnet Synchronous Generationmentioning

confidence: 99%

DC collection networks for offshore generation

Lian¹,

Finney²

2013

2nd IET Renewable Power Generation Conference (RPG 2013)

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Onshore wind farms can now be regarded as a mature technology, capable of providing increasing levels of clean energy. The development of offshore wind technology will provide the ability to harness much larger wind energy resource. Offshore wind arrays present many new challenges including the electrical power system which provides the internal collection system and the connection to the on-shore power network. For remote offshore wind farms, high voltage direct current (HVDC) transmission will be required to transmit power from the wind farm to the shore. The use of HVDC has the effect of decoupling the wind farms internal collection network from the rest of the power grid, thereby removing the requirement for a conventional alternating current (AC) network. This paper discusses the use of a direct current (DC) collection system for offshore wind farms, with particulars emphasis of DC-DC converter requirements. The proposed converter is validated by the simulation model and the performances e.g. switching losses, conduction losses are investigated

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“…The authors of Ref. [16] presented a lumped parameter model of an LC DD-PMSG using the equivalent thermal conductivity of the stator windings. Here, we extend their lumped parameter thermal model to include the detailed thermal model of the stator slot and to include the previously excluded coolant flow arrangement.…”

Section: Introductionmentioning

confidence: 99%

Permanent magnet synchronous generator design solution for large direct-drive wind turbines: Thermal behavior of the LC DD-PMSG

Alexandrova

Semken

Pyrhönen

2014

Applied Thermal Engineering

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Wind is one of the most compelling forms of indirect solar energy. Available now, the conversion of wind power into electricity is and will continue to be an important element of energy self-sufficiency planning. This paper is one in a series intended to report on the development of a new type of generator for wind energy; a compact, high-power, direct-drive permanent magnet synchronous generator (DD-PMSG) that uses direct liquid cooling (LC) of the stator windings to manage Joule heating losses. The main param-eters of the subject LC DD-PMSG are 8 MW, 3.3 kV, and 11 Hz. The stator winding is cooled directly by deionized water, which flows through the continuous hollow conductor of each stator tooth-coil winding. The design of the machine is to a large degree subordinate to the use of these solid-copper tooth-coils. Both steady-state and timedependent temperature distributions for LC DD-PMSG were examined with calculations based on a lumpedparameter thermal model, which makes it possible to account for uneven heat loss distribution in the stator conductors and the conductor cooling system. Transient calculations reveal the copper winding temperature distribution for an example duty cycle during variable-speed wind turbine operation. The cooling performance of the liquid cooled tooth-coil design was predicted via finite element analysis. An instrumented cooling loop featuring a pair of LC tooth-coils embedded in a lamination stack was built and laboratory tested to verify the analytical model. Predicted and measured results were in agreement, confirming the predicted satisfactory operation of the LC DD-PMSG cooling technology approach as a whole.

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Thermal design and analysis of a direct-water cooled direct drive permanent magnet synchronous generator for high-power wind turbine application

Cited by 14 publications

References 6 publications

Stator and rotor vent modelling in a MVA rated synchronous machine

Stator and rotor vent modelling in a MVA rated synchronous machine

DC collection networks for offshore generation

Permanent magnet synchronous generator design solution for large direct-drive wind turbines: Thermal behavior of the LC DD-PMSG

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