Abstract
In order to improve the resilience of distribution networks after major disasters, a three-level service restoration method considering the variability and scarcity of generation resources within microgrids is proposed. First, a feasible restoration tree from microgrids to critical loads is established to maximize the amount of restored critical loads. The reserve capacity state is incorporated as constraints of the restoration problem to ensure that restored loads can have a continuous power supply. Then, considering the service capability of microgrids, the secondary scheme using emergency power supply vehicle (EPS) and microgrids to restore all critical loads is formulated. On this basis, the third-level restoration model with the maximum resilience metric as the objective function is established to guide the restoration of non-critical loads in each period. Finally, the system resilience is evaluated by the non-parametric kernel density estimation. Numerical simulations are performed on the PG&E 69-node and IEEE 123-node feeder system under several scenarios to demonstrate the effectiveness of the proposed method, and the impacts of energy storage system (ESS) and EPS on the restored networks are discussed.
Highlights
With the global climate change, natural disasters occur more and more frequently, resulting in extended outages to end-use customers and huge economic losses [1]
In view of the limited available power supply capacity of the microgrid, this paper formulates a dispatching strategy for emergency power supply vehicle (EPS) to further improve the system resilience, and when the generation resources show an upward trend within a time, the proposed method can allow for increased restoration of non-critical loads
In order to evaluate the overall effectiveness of the restoration strategy in each scenario, the probability distribution of resilience is obtained by using non-parametric kernel density estimation method
Summary
With the global climate change, natural disasters occur more and more frequently, resulting in extended outages to end-use customers and huge economic losses [1]. The above literature considers the limitation of generation resource capacity and first restoring critical loads, it does not include emergency plans to support the restoration of distribution network, and still cannot restore all critical loads. The resilience-oriented restoration method of distribution network after major disasters mainly considers using available generation resources to maximize the restoration of critical loads, and ensure that the restored loads can be provided with sustained and stable power supply. In view of the limited available power supply capacity of the microgrid, this paper formulates a dispatching strategy for emergency power supply vehicle (EPS) to further improve the system resilience, and when the generation resources show an upward trend within a time, the proposed method can allow for increased restoration of non-critical loads.
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