A hybrid resilient static power system expansion planning framework

Abstract

A power system developed solely based on reliability metrics is not expected to appropriately respond to the severe events' effects. Also, reinforcement of existing components may be very expensive if practical. One of the measures taken to have the proper tools to deal with a severe event is to consider the resilience index during generation and transmission expansion planning (GTEP). Microgrids can also increase the power system's resilience and reduce planning costs with the resilience index. In this paper, a hybrid resilient static framework for GTEP is presented, determining the microgrid' optimal penetration rate. The proposed framework is a two-stage framework that, in the first stage, the GTEP problem is solved. In the second stage, the results of planning are examined by the Monte Carlo simulation (MCS) to calculate the expected demand not served (EDNS) as the representative of the resilience index. For reaching the desired resilience, investment costs in the planning stage should be increased and used as a constraint in the next step. This process is repeated for each predetermined microgrids' penetration rate. The effect of the event on the transmission lines is modeled using the notion of fragility curve. In this framework, there is also the ability to use reinforced lines during GTEP as a planning option. The simulations performed on the two sample networks show the effectiveness of the proposed method.