{"title":"A power-equalized harmonic-elimination scheme for utility-connected cascaded H-bridge multilevel converters","authors":"J. Vassallo, J. Clare, P. Wheeler","doi":"10.1109/IECON.2003.1280221","DOIUrl":null,"url":null,"abstract":"Although fundamental frequency switching has been the preferred method for high-power medium-voltage multilevel converters, the technology of current generation power semiconductors has made it possible to use higher rates. In utility-connected applications, where a restricted modulation index range is usually sufficient, a main requirement is for very tight control over individual harmonics. For these reasons, this paper considers the application of selective harmonic elimination PWM (SHEPWM) with 5- or 7-level converters switching at low multiples of the fundamental frequency. An alternative approach for the calculation of multiple solutions of the firing angles is outlined, and is then applied in a modulation scheme that inherently equalizes the power flow from and to the individual DC energy sources. Results from computer simulations for a 7-level energy conversion system are presented in this paper.","PeriodicalId":403239,"journal":{"name":"IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2003-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"69","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/IECON.2003.1280221","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 69
Abstract
Although fundamental frequency switching has been the preferred method for high-power medium-voltage multilevel converters, the technology of current generation power semiconductors has made it possible to use higher rates. In utility-connected applications, where a restricted modulation index range is usually sufficient, a main requirement is for very tight control over individual harmonics. For these reasons, this paper considers the application of selective harmonic elimination PWM (SHEPWM) with 5- or 7-level converters switching at low multiples of the fundamental frequency. An alternative approach for the calculation of multiple solutions of the firing angles is outlined, and is then applied in a modulation scheme that inherently equalizes the power flow from and to the individual DC energy sources. Results from computer simulations for a 7-level energy conversion system are presented in this paper.