This paper addresses the “dual-high” challenges posed by high proportions of renewable energy and power electronic equipment in new power systems, and investigates the active support characteristics of grid-forming energy storage stations in terms of voltage and frequency. Regarding voltage support, the paper analyzes the transient process of a three-phase short-circuit fault in the power grid and proposes a low-voltage ride-through control strategy based on the flexible adjustment of active power and voltage commands. By suppressing short-circuit currents and power-angle instability during the fault, this strategy effectively enhances the system’s transient stability. The effectiveness of this strategy when the grid voltage drops to zero was verified through PSCAD/EMTDC simulations. Regarding frequency support, a small-signal model for frequency regulation of grid-forming converters was established, revealing the influence of controller parameters on the system’s virtual inertia. Simulation results indicate that grid-forming control possesses adjustable inertial support capabilities, effectively enhancing the system’s frequency stability. This research provides a theoretical basis and control strategy support for the application of grid-forming energy storage stations in power grids with a high proportion of renewable energy.
Guo et al. (Mon,) studied this question.