Simple current control method for three‐phase VSC under unbalanced grid condition. Issue 7 (12th April 2018)

• Record Type: Journal Article
• Authors: Du, Xiong; Gu, Shida; Wang, Guoning; Tai, Heng‐Ming; Ji, Yongliang
• Is Part Of: IET power electronics. Volume 11:Issue 7(2018)
• Page Start: 1161
• Page End: 1168
• Publication Date: 2018-04-12
• Subjects: electric current control -- voltage‐source convertors -- power grids -- PI control; three‐phase VSC -- unbalanced grid fault condition -- negative sequence currents -- positive sequence currents -- three‐phase voltage source converters -- second‐order oscillation -- negative sequence synchronous reference frame -- positive sequence synchronous reference frame -- simple direct proportional plus integral current control method -- double synchronous reference frame -- transient response; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2017.0576
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : Injection of both positive and negative sequence currents is desired for three‐phase voltage source converters (VSC) under unbalanced grid fault condition. However, the second‐order oscillation exists in the positive and negative sequence synchronous reference frame. Several approaches have been reported to cope with this second‐order oscillation. Here, a simple direct proportional plus integral current control method in double synchronous reference frame is proposed. The proposed method does not require the additional filter or decoupling circuit, and does not require signal reconstruction for the current reference. Theoretical analysis and experimental study show that the proposed current control not only achieves zero steady‐state error, but also exhibits good transient response.