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Control for Grid-Connected and Intentional Islanding Operations of Distributed Power Generation

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5 Author(s)
Balaguer, I.J. ; Dept. of Electr. Eng., Michigan State Univ., East Lansing, MI, USA ; Qin Lei ; Shuitao Yang ; Supatti, U.
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Intentional islanding describes the condition in which a microgrid or a portion of the power grid, which consists of a load and a distributed generation (DG) system, is isolated from the remainder of the utility system. In this situation, it is important for the microgrid to continue to provide adequate power to the load. Under normal operation, each DG inverter system in the microgrid usually works in constant current control mode in order to provide a preset power to the main grid. When the microgrid is cut off from the main grid, each DG inverter system must detect this islanding situation and must switch to a voltage control mode. In this mode, the microgrid will provide a constant voltage to the local load. This paper describes a control strategy that is used to implement grid-connected and intentional-islanding operations of distributed power generation. This paper proposes an intelligent load-shedding algorithm for intentional islanding and an algorithm of synchronization for grid reconnection.

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Industrial Electronics, IEEE Transactions on  (Volume:58 ,  Issue: 1 )