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 harmonicdistortion of the inverter output current, connecting the fuelcell to the AC load. Using FUZZY LOGIC-PI (FLPI), the controllingmethod is engaged in optimum tuning of the PI controllercoefficients of this converter. This converter has only one DC-ACboost inverter and simultaneously has the task of increasingvoltage level and generating the AC power. In order to control theinverter output voltage, an internal current control loop and anexternal voltage control loop are used. Designing the control ofeach loop is done separately based on FLPI controller. Simulationresults for proposed fuel cell energy system in the presence ofthis controller imply good performance of FLPI and suitablemitigation of inverter output current ripple.