Risk-Averse Optimization for Resilience Enhancement of Complex Engineering Systems under Uncertainties

TL;DR

This paper develops a risk-averse, scenario-based stochastic optimization framework using MILP and advanced decomposition techniques to enhance the resilience of complex interconnected engineering systems against disruptions.

Contribution

It introduces a novel MILP-based restoration framework with risk measures and decomposition methods for resilient recovery under uncertainty in large-scale systems.

Findings

Improved resilience in IEEE 37-bus test case

Effective handling of uncertainties with scenario-based optimization

Enhanced computational tractability through decomposition

Abstract

With the growth of complexity and extent, large scale interconnected network systems, e.g. transportation networks or infrastructure networks, become more vulnerable towards external disruptions. Hence, managing potential disruptive events during the design, operating, and recovery phase of an engineered system therefore improving the system's resilience is an important yet challenging task. In order to ensure system resilience after the occurrence of failure events, this study proposes a mixed-integer linear programming (MILP) based restoration framework using heterogeneous dispatchable agents. Scenario-based stochastic optimization (SO) technique is adopted to deal with the inherent uncertainties imposed on the recovery process from nature. Moreover, different from conventional SO using deterministic equivalent formulations, additional risk measure is implemented for this study because of the temporal sparsity of the decision making in applications such as the recovery from extreme events. The resulting restoration framework involves a large-scale MILP problem and thus an adequate decomposition technique, i.e. modified Lagrangian dual decomposition, is also employed in order to achieve tractable computational complexity. Case study results based on the IEEE 37-bus test feeder demonstrate the benefits of using the proposed framework for resilience improvement as well as the advantages of adopting SO formulations.