Research on Optimization Control Method of Short-Circuit Current Based on Voltage Source Converter

To address the potential issue of excessive short-circuit current (SCC is used instead in the following) in modern power system incorporating Voltage Source Converters (VSC), this paper first introduces the SCC characteristics of VSC operating in active and passive control modes. It then investigates methods for calculating the current contributions of VSC under different control modes. Based on this foundation, a voltage-current droop control current-limiting strategy is initially proposed. Considering the need for reactive power active support due to the low inertia of power electronic equipment, an optimized control method is further proposed that balances both current-limiting and active support requirements. A two-terminal system model is built and simulated in MATLAB/Simulink to verify the effectiveness of the SCC optimized control method. This provides a valuable reference solution for addressing the issue of excessive SCC associated with the increasing number of VSC in future power system.