Comparative Study of Short-Circuit Current Contribution from Small Hydropower and DFIG Wind Generators in Power Systems

This paper presents a method for calculating and simulating short-circuit currents in power systems with the simultaneous participation of small hydropower generators and wind power generators based on doubly fed induction machines. Based on detailed modeling of the control structure and power electronic converters, different short-circuit scenarios were established to evaluate the current response of the two generation sources. The simulation results show that the short-circuit current of small hydropower generators exhibits a high initial magnitude and decreases according to the subtransient, transient, and steady-state characteristics. In contrast, the short-circuit current of wind generators using doubly fed induction machines is limited by the converters and protection mechanisms, and is strongly influenced by the applied control strategies. The analysis and comparison of these two generation types accurately reflect the power distribution and current variations in the system during short-circuit conditions. The research results provide an important basis for protection design, reliability assessment, and stable operation of power systems integrating small hydropower and wind energy sources.

DFIG, Control structure, Renewable energy, Short-circuit calculation

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