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http://dx.doi.org/10.6113/TKPE.2012.17.4.315

Anti-islanding Method by Harmonic Injection for Utility Interactive Inverter with Critical Load  

Oh, Hyeong-Min (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology)
Choi, Se-Wan (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology)
Kim, Tae-Hee (Doosan Heavy Industries & Construction Co., Ltd.)
Lee, Gi-Pung (Doosan Heavy Industries & Construction Co., Ltd.)
Lee, Tae-Won (Doosan Heavy Industries & Construction Co., Ltd.)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.17, no.4, 2012 , pp. 315-321 More about this Journal
Abstract
The utility-interactive inverter with critical loads should supply continuous and stable voltage to critical loads even during the grid fault. The conventional control method which performs current control for grid-connected mode and voltage control for stand-alone mode undergoes the critical load voltage variation during grid fault. The critical load voltage may have large transient when the inverter performs mode transfer after the islanding detection. Recently, the indirect current control method which does not have the transient state during not only islanding detection but also the mode transfer has been proposed. However, since the voltage control is maintained even during the grid-connected mode it is difficult to detect the islanding. This paper proposes an active anti-islanding method suitable for the indirect current control method which does not have NDZ(Non-Detection Zone).
Keywords
indirect current control; active anti-islanding; utility-interactive inverter; critical load;
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