The Impact of LCL Filter on the Crest Factor in Hybrid Power Systems

This study investigates the effect of the LCL filter on the crest factor of the load signal for a hybrid system. For this purpose, a hybrid test system has been modeled in the Matlab/Simulink environment. Buck/boost converter, inverter, and LCL filter have been designed. PWM signal has been generated using the incremental conductance (INC) algorithm. The gate-switching signal for the IGBTs has been generated using the PWM signal. The performance of the LCL filter with various parameters has been examined, and the effect of the signal on the load concerning the crest factor has been analyzed. Results showed that increasing inductance caused a deviation from the optimal crest factor and a reduction in peak voltage due to increased inductive reactance. Additionally, it was found that a 60 μF capacitance yielded improved crest factor performance, while higher values (90 μF) introduced significant harmonic distortion. The study indicates that the use of the LCL filter in power converters plays an important role in reducing the ripples in the system and that the LCL filter is effective in reducing the crest factor. The results highlight the significance of implementing an LCL filter to enhance the efficiency and reliability of PV panels in hybrid power systems. This study offers important insights into how LCL filters impact the stability and performance of systems powered by renewable energy sources.