Abstract
The fault characteristic of islanded microgrid is closely related to the control strategy of distributed generation (DG) and it is different from that of grid-connected microgrid. Also, the analysis of fault control strategy is an essential foundation of the fault location. This paper discussed the control strategy and output fault characteristic of V/f and PQ controlled DG. To establish the fault detection criterion of islanded microgrid, the coordinating control strategy between V/f and PQ controlled DG is presented. Based on the above fault analysis, the fault point is located by using a new fault detection method, which is based on the phase differences between the pre-fault bus voltage and the positive- sequence current fault component of the feeders. Finally, examples are simulated in PSCAD/EMTDC and the results verify the accuracy and effectiveness of the proposed fault detection method.
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