REDUCTION OF INVERTER OUTPUT CURRENT RIPPLE IN CONNECTION OF FUEL CELL TO THE POWER NETWORK

In this paper, a method is introduced which reduces the harmonic distortion of the inverter output current, connecting the fuel cell to the AC load. Using FUZZY LOGIC-PI (FLPI), the controlling method is engaged in optimum tuning of the PI controller coefficients of this converter. This converter has only one DC-AC boost inverter and simultaneously has the task of increasing voltage level and generating the AC power. In order to control the inverter output voltage, an internal current control loop and an external voltage control loop are used. Designing the control of each loop is done separately based on FLPI controller. Simulation results for proposed fuel cell energy system in the presence of this controller imply good performance of FLPI and suitable mitigation of inverter output current ripple.