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1、附录AResearchofParameterAdjustableHarmonicSignalGeneratorBasedonDDSLIWeiCollegeofComputerandInformationEngineeringHohaiUniversityChangzhou,213022,Chinaliwei_2142@163.comZHANGJinboCollegeofComputerandInformationEngineeringHohaiUniversityChangzhou,213022,Chinazhangjb@hhuc.edu.cnA
2、bstractHarmonicsignalgeneratorwhosefrequency,phaseandharmonicproportionareadjustableisdesignedforthedetectingequipmentofpowersystem.TheprincipleofDDSandthedesignrequirementareintroduced.ThenthealgorithmofROMcompressionbasedonthesymmetryofsinewaveisexpounded.Finally,usingAlter
3、aFPGA,thedetaildesignofthewholesystemispresentedandtestwaveformsaregiven.Testresultsindicatethatthesystemfulfilsthedesignrequirements.1.IntroductionAnidealpowersystemsuppliespowerwithsinewave,butthepracticalwaveformofpowersupplyoftenhasmanyharmoniccomponents.Thebasicreasonofh
4、armonicisthatthepowersystemsuppliespowertotheelectricalequipmentwithnonlinearcharacteristic.Thesenonlinearloadsfeedhigherharmonicbacktothepowersupply,andmakethewaveformofcurrentandvoltageinpowersystemproduceseriousdistortion.Inthedetectionfieldofpowersystem,standardsignalgene
5、ratorswhichcansimulatethepowerharmonicarehighlyneededtocalibratethepowerdetectingequipment,suchasphasedetector,PDdetector,andsoon.Sotheresearchofparameteradjustableharmonicsignalgeneratorprovidestheexactbasisforthestableoperationofpowerdetectingequipment,andhasgreateconomicbe
6、nefitandsocialvalue.2.PrincipleofdirectdigitalsynthesisDirectdigitalsynthesis(DDS)isanewfrequencysynthesistechnologywhichdirectlysynthesizeswaveformonthebasisofphase.Usingtherelationshipbetweenphaseandamplitude,thephaseofwaveformissegmentedandassignedrelevantaddresses.Ineachc
7、lockperiod,theseaddressesareextractedandtherelevantamplitudesaresampled.Theenvelopeofthesesampledamplitudesistheexpectedwaveform.Iftheclockfrequencyisconstant,thefrequencyofoutputsignalisadjustablewithdifferentextractedstepsofaddresses.DDSiscomposedofphaseaccumulator,ROMtable
8、,DACandLPF.Ineachclockperiod,theoutputofphaseaccumulatorisaccumulate
