Washington State University, Washington, United States
Keywords: power system, resiliency, facts, power electronics, weatherPower outages in the United States cost $27-$52B per year. Weather-related outages account for about 67% of all U.S. outages. There is growing evidence that weather-related outages are becoming more frequent in some areas due to increasing sophistication of infrastructure and/or deficits in maintaining equipment health, and perhaps changes in weather patterns. The exposure of transmission lines and generation facilities to weather phenomena and consequent outages are a primary challenge for power system operators and transmission owners. Integration of renewables increases the variability of power flow and congestion patterns. These factors complicate resiliency to severe-weather disruptions as they 1) increase the chance of wide-area cascading/propagative impacts and 2) require flexible, not playbook, strategies to address impacts. In this research, we show our results in routing power away from vulnerable lines in reaction to a contingency. This requires a fast response, but existing solutions for generator redispatch and load shedding are slow because of power ramping limits and computational burden. We instead propose a fast algorithm to adjust the impedance of a line to change the power flow pattern using power electronics devices for resiliency to severe weather failures.