An Effective Current Limiting Strategy to Enhance Transient Stability of Virtual Synchronous Generator

Virtual synchronous generator (VSG) control has emerged as a crucial technology for integrating renewable energy sources. However, power electronic devices have limited tolerance to overcurrent, necessitating the implementation of current limiting CLstrategies to mitigate the overcurrent. The introduction of different CL strategies can have varying impacts on the transient stability of the system. While previous studies have discussed the effects of different CL strategies on transient stability, but they lack intuitive and explicit explanations. Meanwhile, previous CL strategy have failed to effectively ensure the transient stability of the system. In this paper, the Equal Proportional Area Criterion (EPAC) method is employed to intuitively explain how different CL strategies affect transient stability. Based on this, an effective current limiting strategy is proposed. Simulations are conducted in MATLAB/Simulink to validate the proposed strategy. The simulation results demonstrate that, the proposed effective CL strategy exhibits superior transient stability.