Interconnection-wide Grid Security Assessment |
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This study is motivated by the 2015 FAST Act, which mandates a national transformer security assessment. Given the number of units nation-wide and the inescapable reality of combinatorial math, computational analysis for every possible outage scenario is not feasable. In response, this work proposes two metrics to rank the relative criticality of all transformers by location and prioritize event scenarios based on system risk. The first (Figure 1) uses real power flow constraints. The second (Figure 2) measures the availability of voltage support. While the original scope of this study is specifically large power transformers, the methodology developed can be used as a resilience assessment metric for any set of grid-connected elements in a given system.
Fig. 1. Thermal Metric
Fig. 2. Voltage Support Metric