A Study on Control Mode of Inverter-Based Resources Considering Trade-off between Transient Stability and Short-term Frequency Stability

Abstract

In recent years, various control modes of grid-forming inverter (GFM) have been studied for transient stability and short-term frequency stability in power systems with large amount of renewable energy sources (RES). In this paper, we investigate the trade-off between the two stabilities caused by GFM to get a better knowledge of RES's effective control mode for each interconnection area. Numerical simulations newly reveal that applying GFM to receiving area deteriorates both stabilities in some fault scenarios due to its reactive power output when the terminal voltage drops slightly. Based on the results, a reactive power control strategy of GFM to address the trade-off issues is proposed and RES's effective control mode for each interconnection area is summarized.