Negative-sequence Current Injection of Dispersed Generation for Islanding Detection and Unbalanced Fault Ride-through

Conference: UPEC 2011 - 46th International Universities' Power Engineering Conference
09/05/2011 - 09/08/2011 at Soest, Germany

Proceedings: UPEC 2011

Pages: 6Language: englishTyp: PDF

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Tuyen, Nguyen Duc; Fujita, Goro (Shibaura Institute of Technology, 3-7-5, Toyosu, Koto-ku, Tokyo, Japan)

Power electronic interface of dispersed generation play a very important role in connecting a dispersed generation itself with utility grid. A power electronic interface not only controls the amount of active and reactive power injecting into a grid but also implements other importance stuffs as well. In this paper, negative-sequence current injection has been fulfilled in power electronic interface for two important duties. The first one is for islanding detection, and the other one is to enhance unbalance-fault ride-through ability of dispersed generation. This paper introduces a mechanism of negative-sequence injection based on controlling two separate coordinates of dq control and explains the effective of negative-sequence injection in limiting the unbalanced currents. Using Adaptive Notch Filter as a signal processing unit, negative-sequence components are observed. Control system performance is evaluated based on time domain simulations in PSCAD/EMTDC environment.