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access icon free Synchronous islanded operation of an inverter interfaced renewable rich microgrid using synchrophasors

© The Institution of Engineering and Technology
Received 16/06/2017, Accepted 26/11/2017, Revised 03/10/2017, Published 28/11/2017

This study describes a novel strategy for microgrid operation and control, which enables a seamless transition from grid connected mode to islanded mode, and restoration of utility supply, without loss or disruption to loads sensitive to frequency or phase angle dynamics. A simulation study is conducted on a microgrid featuring inverter connected renewable generation, and power electronic interfaced loads. Therefore, the microgrid inherently has low inertia, which would subsequently affect the dynamic characteristics of the microgrid, in particular during mode transition. The microgrid is controlled by means of synchrophasor data to achieve synchronous island operation, enabling the microgrid to track the utility frequency and phase angle. The simulation includes synchrophasor acquisition and telecoms delays, allowing for detailed investigation of the microgrid dynamics under various mode transition scenarios, including the risk of commutation failure of the inverter sources. The proposed method is demonstrated to successfully maintain a microgrid in synchronism with the main utility grid after the transition to islanded mode without significant impact on various equipment connected to the microgrid. Thus, synchronous island operation of low inertia microgrids is feasible. This study also showed that utility supply could be seamlessly restored if the microgrid is operated as a synchronous island.

Inspec keywords: invertors; distributed power generation; phasor measurement

Other keywords: microgrid control; utility frequency; low inertia microgrids; mode transition scenarios; utility supply; main utility grid; dynamic characteristics; synchronous islanded operation; microgrid operation; synchrophasor data; phase angle dynamics; grid connected mode; power electronic interfaced loads; inverter sources; commutation failure; inverter connected renewable generation; inverter interfaced renewable rich microgrid

Subjects: DC-AC power convertors (invertors); Power system measurement and metering; Distributed power generation

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