Resilience improvement with zero load curtailment by multi-microgrid based on system of systems

This article studies the resilience and energy management in multi-microgrid system. In the proposed model, the microgrid is formed by four sub-microgrids. Based on the system of systems (SOS), these sub-microgrids pool their resources and capacities together to form a new and more complex microgrid that provides further functionality than the basic separated microgrids. One of the sub-microgrids is connected to the external grid. The tie-line connections are between all sub-microgrids. Some connections are normally-open and the rest are normally-closed. The status of normally-open connections is changed to close when the resilience or economic criteria dictate. The sub-microgrids are integrated with solar panels, wind turbines, battery energy storage (BES) and loads. All sub-microgrids are also equipped with diesel generator as emergency resource. Under normal operating condition, the proposed model optimally utilizes the resources of all sub-microgrids to minimize the cost, pools the extra resources of sub-microgrids, and optimizes the operation of batteries and diesel generators. Under faulty operating condition when some or all sub-microgrids are islanded, the model supplies the loads with zero load curtailment and minimizes the costs. In the faulty condition, the model may change the status of connections from normally-open to close when required. The simulation results on a given test system verify that the recommended model confirms optimal operation of the microgrid. Furthermore, all sub-microgrids, improves resilience, minimizes operating cost, handles the events and achieves zero load curtailment under both faulty and healthy conditions. 2020 Institute of Electrical and Electronics Engineers Inc.. All rights reserved.This work was supported by the Qatar National Library.Scopus2-s2.0-8510281990