access icon free Optimal operation of hybrid microgrids for enhancing resiliency considering feasible islanding and survivability

© The Institution of Engineering and Technology
Received 26/09/2016, Accepted 02/02/2017, Revised 10/01/2017, Published 03/02/2017

Microgrids have the capability to enhance the resiliency of power systems by supplying local loads during emergency situations. However, the disturbance incident and clearance times cannot be predicted precisely. Therefore, this study is focused on enhancing the resiliency of hybrid microgrids considering feasible islanding and survivability of critical loads. The optimisation problem is decomposed into normal and emergency operation problems. In normal operation, unit commitment status of dispatchable generators and schedules of batteries are revised to ensure a feasible islanding following a disturbance event. In emergency operation, the decision between charging of batteries for future dispatch and feeding of lesser critical loads is considered. In addition, a strategy for minimisation of load curtailment during switching of scheduling windows is also considered. These two considerations can mitigate the curtailment of critical loads during the emergency period. Finally, a resiliency index is formulated to evaluate the performance of the proposed strategy during emergency operation. Numerical simulations have demonstrated the effectiveness of the proposed strategy for enhancing the resiliency of hybrid microgrids.

Inspec keywords: power generation reliability; power generation scheduling; power distribution faults; distributed power generation

Other keywords: optimal operation; hybrid microgrids; resiliency index; scheduling windows; survivability; power system resiliency; islanding

Subjects: Distribution networks; Distributed power generation; Reliability

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