High-power Generators for Offshore Wind Turbines

Zhang, Zhiliang; Chen, A.; Matveev, Alexey; Nilssen, Robert; Nysveen, Arne

doi:10.1016/j.egypro.2013.07.158

Cited by 47 publications

(20 citation statements)

References 16 publications

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“…The two main types of electrical generator used in offshore wind energy are the squirrel cage induction machine (SCIM) and the wound rotor induction machine (WRIM). As reported in [4], they can be found in more than 90% of the turbines in offshore wind farms. As induction machines possess a relatively small airgap, they are more susceptible to UMP [5].…”

Section: Introductionmentioning

confidence: 84%

Calculation of unbalanced magnetic pull in induction machines through empirical method

Chuan

Shek

2018

IET Electric Power Applications

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Unbalanced Magnetic Pull (UMP) is an important factor to study to improve the reliability of induction machines. UMP occurred in a machine when the existence of rotor eccentricity which causes an uneven distribution of magnetic flux in the airgap. In this study, a UMP damping coefficient is introduced to explain the UMP damping effect from the counteracting flux produced by a parallel connected cage rotor. An empirical method is proposed to calculate the UMP using the damping coefficient and an analytical model. Using the proposed method, a 4-pole and 8-pole squirrel cage induction machine with static eccentricity are investigated, which uses inputs from both Finite Element Analysis and experimental work. Then, the UMP calculation for a dynamic eccentricity with the extracted parameters is done to verify the empirical method. A slip control method is described which uses a UMP/Torque ratio to find the operating slip with the lowest UMP. Comparisons between results with and without slip control are made on both induction machines. It shows that great reduction of UMP can be achieved when the machine is lightly loaded.

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Section: Introductionmentioning

confidence: 84%

Calculation of unbalanced magnetic pull in induction machines through empirical method

Chuan

Shek

2018

IET Electric Power Applications

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“…Compared to the wind turbine with gearbox and high speed generator, direct-drive drivetrain has a simple drivetrain, and the issues of scheduled maintenance and higher failure rates with the gearboxes are eliminated, resulting in high reliability and availability [3]. Therefore, the direct-drive drivetrains are preferred for offshore wind generation [4].…”

mentioning

confidence: 98%

Design of a Superconducting Synchronous Generator With LTS Field Windings for 12 MW Offshore Direct-Drive Wind Turbines

Wang

Tang

et al. 2016

IEEE Trans. Ind. Electron.

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Offshore wind generation is an important trend of global wind power generation. To reduce the cost of energy of offshore wind generation, high-power direct-drive wind turbines are being pursued around the world. With the development of superconductors and related technologies, superconducting (SC) generator offers a possible technological approach to produce largescale direct-drive wind turbines with a modest cost. A design of a SC wind generator (SCWG) for offshore direct-drive wind turbines is presented in this paper. The proposed SCWG is an electricallyexcited synchronous generator with stationary field windings made of low temperature superconductor wires. The electromagnetic design considerations on SCWG are studied. The description on design of copper rotor and SC stator are presented. Several key design technologies including rotor cooling and supporting structure design, SC field winding design, and cryogenic refrigeration system for SC magnets are analyzed. The weight and cost of the proposed SCWG are estimated and compared with that of a permanent magnet wind generator (PMWG) design and several existing similar SCWG designs. It is found that the proposed SCWG is 46% lighter than the PMWG with the same specifications. Moreover, a rough estimation of material cost of the SCWG is carried out, and comparison analysis of cost is also performed.  Index Terms-Offshore wind generation; high power wind turbine; superconducting generator; weight reduction; low temperature superconductor

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“…In the meantime, the feasibility studies conclude that using the current SG technology for the next generation WTs, especially Direct Drive ones, will result in extremely large and heavy WTs that are impractical and uneconomic. Therefore, requirement for a new electrical generator technology with higher torque density is clear, in order to design next generation DD WTs with reasonable dimensions and weight [2], [4], [8], [9], [15]. Application of superconductor technology for the field winding of SGs has been considered as an appropriate solution for this problem, and pilots of such WTs are passing the final steps of their experimental use [1]- [5], [8], [13].…”

mentioning

confidence: 99%

“…As the results declare, the ECSG WT has the most reliable converter unit, being more than twice more reliable than the DBR-Boost SG WT, and the DBR-Boost SG WT converter has the second grade, with twice more reliability than the VSC SG WT converter unit. WTs with higher reliability converter are very advantageous, especially for offshore applications, since converter failure is one of the major faults and WTs maintenance in offshore is expensive and more importantly, weather-dependent, which can result in weeks of lost electricity generation for the faulty offshore WT [3], [4], [8], [13].…”

mentioning

confidence: 99%

A Comparative Analysis of The New Excitation Controlled Synchronous Generator-Based Wind Turbine

Shamsnia

Parniani

2019

Scientia Iranica

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Excitation Controlled Synchronous Generator-based Wind Turbine (ECSG WT) is a recently proposed wind turbine scheme which has not been fully investigated in detail. This paper is devoted to analyze performance of the ECSG WT scheme and to compare it with two mainstream wind turbine schemes based on electrically excited synchronous generator, i.e. VSC-based full converter wind turbine and diode bridge rectifier-based wind turbine equipped with boost converter on its DC link. The aim of this comparison is to demonstrate great potentials of ECSG WT for being considered in wind industry. To do so, two successful WT schemes at the market which are structurally close to ECSG WT are selected. The comparison includes different technical and economic aspects of the three schemes, assuming DC grid connection for the wind turbines. In addition, another comparison is made between the recently introduced Siemens 2 nd generation DC Grid Access Offshore wind farm and a wind farm with similar structure, but using ECSG WTs. The results of these comparisons declare that ECSG WT scheme has promising characteristics, especially regarding economic, reliability and efficiency aspects.

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High-power Generators for Offshore Wind Turbines

Cited by 47 publications

References 16 publications

Calculation of unbalanced magnetic pull in induction machines through empirical method

Calculation of unbalanced magnetic pull in induction machines through empirical method

Design of a Superconducting Synchronous Generator With LTS Field Windings for 12 MW Offshore Direct-Drive Wind Turbines

A Comparative Analysis of The New Excitation Controlled Synchronous Generator-Based Wind Turbine

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