Design and Analysis of Reduction of Current Ripple and Total Harmonic Distortion in Fuel Cell Generating System

In this paper, a ripple current reduction by using a fuel cell method is proposed that does not require additional switching devices. The proposed circuit realizes a dc active filter function without increasing the number of switching devices, because the energy buffer capacitor is connected to the centre tap of the isolation transformer. In addition, the buffer capacitor voltage is controlled by the common-mode voltage of the inverter. The above system has been modelled in the MATLAB/SIMULINK environment. The features of the proposed circuit, control strategy, and experimental results are described, including the result of ripple reduction. Also comparative analysis of the THD values has been done for the conventional and proposed convertor topologies.