The growth of renewable energy sources and microgrid systems is becoming challenges in various aspects of the electrical power system. The focus of this paper is to address the decrease in fault current levels since inverters cannot inject a high fault current similar to synchronous generators in conventional electrical system. This issue becomes crucial when the microgrid operates in islanding mode. In this paper, a fault current boosting technique for grid-connected inverters is proposed, by using the resonance frequency of the inverter’s LCL filter to enlarge the output current up to 2 times of the inverter rated current. The inverter will switch from normal operation to low voltage operation when a fault occurs in the system and revert to normal operation when the fault is cleared. The proposed algorithm is stimulated using Matlab/Simulink and confirmed by laboratory testing with a 3kVA three-phase inverter. The results demonstrate that the inverter can inject high-frequency current and enlarge the current at the point of common coupling (PCC) to 2.4 times the inverter’s output current, while output current of inverter does not exceed its rating. The inverter remains connected throughout the low voltage period and switches back to normal operation when the voltage at PCC returns to the nominal voltage.
An Implementation of Fault-Current Boosting Technique for Inverter-Based Renewable Energy
28.11.2023
1254920 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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