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1、附录AResearchofParameterAdjustableHarmonicSignalGeneratorBasedonDDSLIWeiCollegeofComputerandInformationEngineeringHohaiUniversityChangzhou,213022,Chinaliwei_2142@163.comZHANGJinboCollegeofComputerandInformationEngineeringHohaiUniversityChangzhou,213022,China
2、zhangjb@hhuc.edu.cnAbstractHarmonicsignalgeneratorwhosefrequency,phaseandharmonicproportionareadjustableisdesignedforthedetectingequipmentofpowersystem.TheprincipleofDDSandthedesignrequirementareintroduced.ThenthealgorithmofROMcompressionbasedonthesymmetry
3、ofsinewaveisexpounded.Finally,usingAlteraFPGA,thedetaildesignofthewholesystemispresentedandtestwaveformsaregiven.Testresultsindicatethatthesystemfulfilsthedesignrequirements.1.IntroductionAnidealpowersystemsuppliespowerwithsinewave,butthepracticalwaveformo
4、fpowersupplyoftenhasmanyharmoniccomponents.Thebasicreasonofharmonicisthatthepowersystemsuppliespowertotheelectricalequipmentwithnonlinearcharacteristic.Thesenonlinearloadsfeedhigherharmonicbacktothepowersupply,andmakethewaveformofcurrentandvoltageinpowersy
5、stemproduceseriousdistortion.Inthedetectionfieldofpowersystem,standardsignalgeneratorswhichcansimulatethepowerharmonicarehighlyneededtocalibratethepowerdetectingequipment,suchasphasedetector,PDdetector,andsoon.Sotheresearchofparameteradjustableharmonicsign
6、algeneratorprovidestheexactbasisforthestableoperationofpowerdetectingequipment,andhasgreateconomicbenefitandsocialvalue.2.PrincipleofdirectdigitalsynthesisDirectdigitalsynthesis(DDS)isanewfrequencysynthesistechnologywhichdirectlysynthesizeswaveformonthebas
7、isofphase.Usingtherelationshipbetweenphaseandamplitude,thephaseofwaveformissegmentedandassignedrelevantaddresses.Ineachclockperiod,theseaddressesareextractedandtherelevantamplitudesaresampled.Theenvelopeofthesesampledamplitudesistheexpectedwaveform.Ifthecl
8、ockfrequencyisconstant,thefrequencyofoutputsignalisadjustablewithdifferentextractedstepsofaddresses.DDSiscomposedofphaseaccumulator,ROMtable,DACandLPF.Ineachclockperiod,theoutputofphaseaccumulatorisaccumulate
