Analysis of Bandwidth–Unit-Vector-Distortion

《Analysis of Bandwidth–Unit-Vector-Distortion》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、5820IEEETRANSACTIONSONINDUSTRIALELECTRONICS,VOL.60,NO.12,DECEMBER2013AnalysisofBandwidthUnit-Vector-DistortionTradeoffinPLLDuringAbnormalGridConditionsAbhijitKulkarni,StudentMember,IEEE,andVinodJohn,SeniorMember,IEEEAbstractPhase-lockedloops(PLLs)arenecessaryinapplica-in[9]and[10]wher

2、einzero-crossingdetectionisusedtomaketionswhichrequiregridsynchronization.Presenceofunbalancethesystemfrequencyadaptive.In[11]and[12],PLLstructuresorharmonicsinthegridvoltagecreateserrorsintheestimatedbasedonenhancedPLLsareexplainedforbetterperformance.frequencyandangleofaPLL.Theerror

3、inestimatedanglehasPLLwithin-loopleadcompensatorisproposedin[13].theeffectofdistortingtheunitvectorsgeneratedbythePLL.Inthispaper,analyticalexpressionsarederivedwhichdetermineAfeatureofmostofthehigh-performancePLLsisthattheerrorinthephaseangleestimatedbyaPLLwhentheretheyhaveanequivale

4、ntSRF-PLLembeddedinthem.Theisunbalanceandharmonicsinthegridvoltage.Byusingthehigh-performancePLLsprovidereducedunitvectorTHDbutderivedexpressions,thetotalharmonicdistortion(THD)andthehavehighercomplexityandmightrequireahigh-enddigitalfundamentalphaseerroroftheunitvectorscanbedetermine

5、dcontrollerforimplementation.ItisknownthatSRF-PLLcanforagivenPLLtopologyandagivenlevelofunbalanceanddistortioninthegridvoltage.Theaccuracyoftheresultsobtainedprovidebetterperformance[15],[16]atlowerbandwidth.How-fromtheanalyticalexpressionsisvalidatedwiththesimulationever,theexacttrad

6、eoffintherelationshipbetweenbandwidthandexperimentalresultsforsynchronousreferenceframePLLofSRF-PLLandunitvectordistortionhasnotbeenstudied.(SRF-PLL).Basedontheseexpressions,anewtuningmethodforIntheliterature,therehasnotbeenanattempttoquantifythetheSRF-PLLisproposedwhichquantifiesthetr

7、adeoffbetweenlevelsofdistortionsintheunitvectorsduetogridvoltageunbal-theunitvectorTHDandthebandwidthoftheSRF-PLL.Usingthismethod,theexactvalueofthebandwidthoftheSRF-PLLanceandharmonics.Analyticalquantificationoftheunitvectorcanbeobtainedforagivenworstcasegridvoltageunbalancedistortion

8、isimp