Island Detection using Micro PMU, Fortescue transform and Load flow analysis

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PMUs have already established its useful assets in the stomping ground of transmission grid. With the proliferation of the DGs at full length of the distributed system, rendering it to be no longer quasi-stationary, μPMUs will become indispensable for the sensory as well as protective part of the distribution system. Taking this into account, the paper proposes a method that employs p-type μPMUs for islanding detection. The most significant feature of this technique is the non-requirement of any additional hardware unit. The inbuilt microprocessor in the μPMU can be aptly programmed to execute the required Fortescue transform and the required signal during islanding can be sent using the communication channel of the μPMUs. The algorithm has zero NDZ and is also insensitive to different non-islanding scenarios, fault scenarios as well as other power system operations. Moreover, the algorithm also proposes intelligent islanding and prevents the critical load from being shut down. Further, the μPMUs of the islanded area enhances situational awareness by sending information regarding islanding scenario to other IPPs as well as the utility as a consequence of which after islanding, they are able to cope up any disturbances in the non-islanded area. Thus, from practical implementation point of view, this method proves to be easy, less time consuming and cost efficient. The robustness and feasibility of this method is justified with proper simulation results.

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