{"title":"A Smith Predictor Based High-Frequency Oscillation Suppression Method for VSC-HVDC System","authors":"Siqi Liu;Pengfei Hu;Yiqi Liu;Naixuan Zhu;Yanxue Yu;Daozhuo Jiang","doi":"10.1109/JESTIE.2024.3418215","DOIUrl":null,"url":null,"abstract":"This article presents a novel method to suppress high-frequency oscillations (HFOs) in voltage-source converters (VSCs) based high-voltage direct current (HVDC) systems. The analysis reveals that the main reason for HFOs is the negative damping of the VSC-HVDC impedance at high frequencies, which results from the time delay of the control system. The proposed method employs a Smith predictor to directly compensate for the time delay of the VSC-HVDC control system and eliminate the HFOs. The article first reviews the instability mechanism of VSC-HVDC systems. Then, it presents the Smith-predictor-based control method for HFO suppression and evaluates its robustness. Finally, the proposed method and theoretical analysis are verified by simulation and hardware-in-the-loop tests results.","PeriodicalId":100620,"journal":{"name":"IEEE Journal of Emerging and Selected Topics in Industrial Electronics","volume":"5 4","pages":"1572-1581"},"PeriodicalIF":0.0000,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Journal of Emerging and Selected Topics in Industrial Electronics","FirstCategoryId":"1085","ListUrlMain":"https://ieeexplore.ieee.org/document/10579776/","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
This article presents a novel method to suppress high-frequency oscillations (HFOs) in voltage-source converters (VSCs) based high-voltage direct current (HVDC) systems. The analysis reveals that the main reason for HFOs is the negative damping of the VSC-HVDC impedance at high frequencies, which results from the time delay of the control system. The proposed method employs a Smith predictor to directly compensate for the time delay of the VSC-HVDC control system and eliminate the HFOs. The article first reviews the instability mechanism of VSC-HVDC systems. Then, it presents the Smith-predictor-based control method for HFO suppression and evaluates its robustness. Finally, the proposed method and theoretical analysis are verified by simulation and hardware-in-the-loop tests results.
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