HVDC Power SystemHarmonic Analysisin theTime and Frequency Domains

Harmonics inHVDC powersystems causedby highly non-linear devices affect itsperformance. Controlling and eliminating suchharmonics havebeenagreat concern ofpower engineers inpowersystemdesign andoperation. TheHVDC powersystem harmonic analysis is, therefore, essential inpower systemplanning, control, and operation. The two main mathematical approaches inpowersystemharmonic studyare thetime-domain analysis andthefrequency-domain solution. Theformerissuitable forstudying phenomenaincluding non- linearity, switching operations, long-time simulations, and control systems. Thelatter, ontheotherhand,isappropriate for studying phenomenasuchasfrequency dependence, system equivalents, andfrequency response. Thispaperdiscusses the timeandfrequency domainmethods intheHVDC powersystem harmonicanalysis. Itreviews thesources ofHVDC system harmonics. The paperalsorevealstheadvantages and disadvantages ofthemethodsandpoints outtheirsuitable applications inpowernetwork harmonic computations. IndexTermsFrequency domainsolution method, harmonic generation, harmonicanalysis, HVDC powersystems, time domainsolution method.