Grid-Connected Fuel Cell Power Quality Improvement System Control Based on Phase Compensator on Capacitor Current Feedback Active Damping

Recently, fuel cells (fc) have received attention due to their environmental benefits and applications in distributed generation systems. voltage source inverters interconnect the fcs to the power grid. in this paper, the capacitor current feedback (ccf) method is utilized to dampen the lcl filter’s inherent resonance, and a phase compensator in the ccf path is used to compensate for the undesirable effects of the control delay of the grid-connected fc power quality improvement system. with this trick, a virtual rc network is paralleled by the filter capacitor, effectively increasing the range of the vprr without changing the instances of sampling. to check the performance correctness of the suggested method, the design of each section is introduced for the phase compensation and the parameters of the closed-loop system under study. with this trick, the prohibited range of the lcl filter’s resonance frequency is deleted, and the limitation of the resonance frequency is removed. the results of the low-voltage grid-connected fc power quality improvement system with the suggested control method reveal that the stability of system is maintained with changes in the network impedance. also, the injected current’s quality is very suitable even in the harmonically weak network.