Transient Stability Analysis of a Flexible Generator Used in Fusion Power Plant

The China fusion engineering test reactor (CFETR) could output 50-200 MW fusion power for demonstrating power generation. The overall structure of fusion power plant in concept design is similar to a pressurized-water reactor (PWR), except a doubly fed induction generator with flywheel (DFIGF) has been proposed to replace the traditional synchronous generator used in a PWR. The heat source of fusion plant is not constant in long-pulse operation mode of tokamak. Hence, it will lead to frequent inrush in synchronous generator and power grid. Although a high-power electric heating pressure regulator can mitigate the inrush, it consumes a lot of energy. The proposed DFIGF has good power regulation ability and large energy storage capacity, which suits the application when instability of heat source exists. The simulation model has been established and dynamic response analysis has demonstrated that DFIGF can ride-through the burning interval smoothly and provide a flexible connection with power grid.