风电机发展趋势.ppt

《风电机发展趋势.ppt》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、风电机发展趋势将来的风电机？设计趋势LargerDiametersTipSpeed-OffshoreandLandBasedDesignsPitchvStallSpeedVariationRotorMass风电机组单机容量的增长情况大直径Biggerandmoreefficient!3.6-6MWprototypesrunning(Vestas,GE,SiemensWind,Enercon)!2MWWTsarestillthe“bestseller”inthemarket!风轮重量Asdesignsevolvewithin

2、creasingattentiontomassreductionanoverallpictureofrotormassscalingaslessthancubicisapparentItwillbeachallengetothesearchforappropriatematerialswillcentre.Rotormasstrends大直径飞轮扫掠面积与半径平方成正比如果只考虑重量引起的疲劳，叶片质量成本是尺寸的三次方。传动链的质量成本也是安三次方增加。多兆瓦风电机在根本上讲效益差！限制风电机尺寸发展的是经济性，而不是技

3、术性。尖速比-海上、岸上Noiseincreasesverysharplywithtipspeed.Foragivenpowerafastturningturbineexhibitslowertorque(drivetrainload)thanalowspeedturbineandhencehasalowerdrivetraincost.Thereisthereforeatrade-offbetweendrivetrainloadandnoisetobemade.Fortheonshoremarketthenoiseist

4、hemajorconstraint.Foroffshoreturbines,averysignificantincreaseintipspeedrangingapproximatelyfrom10to30%isevident.最新技术尖速比在10左右达到最佳效率。噪声对海洋生物的影响。变桨vs失速UntiltheadventofMWscalewindturbinesinthemid1990’s,stallregulationpredominatedbutpitchregulationisnowthefavouredopti

5、onforthelargestmachines.Ratioofpitchregulatedtostallregulateddesignsof≥1MWrating变速Operationatvariablespeedoffersthepossibilityofincreased"gridfriendliness”,loadreductionandsomeminorenergybenefits.Itisthusanattractiveoption.Amongwindturbinesover1MWrating,outof52dis

6、tinctmodelsof20differentmanufacturers,3werefixedspeed,12hadtwospeedsystemsand37employedvariablespeed.Variablespeedoperationisrealisedinmanywayseachdifferinginsignificantdetails.Directdrivesystemshaveanaturalcapabilityforverywidespeedrange.The‘conventional’variable

7、-speedconceptusingageareddrivetrainconnectsthegeneratortothenetworkthroughapowerelectronicconverterandenablessystemsthatmayhavewideornarrowspeedranges.Theelectricalenergyisgeneratedatvariablefrequency–afrequencyrelatedtotherotationalspeedoftherotor–andthenconverte

8、d,bytheconverterorinverter(bothpowerelectronicdevices)tothefrequencyofthegrid..Thereareseveralpossibleconfigurations,basedonbothsynchronousandinductiong