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International Journal of Fuzzy Logic Systems (IJFLS) Vol.2, No.3, July 2012 Figure 4: Line side converter control for grid connected mode For the isolated mode of operation the power conditioning unit consist of a three phase diode rectifier, a voltage source inverter (VSI) and LC filter are used. The control system for a voltage source inverter is shown in Figure 5. A 166 Hz, voltage source feeds a 50Hz, 50kW load through an AC/DC/AC converter. The 480V, 166Hz AC power is first rectified by six pulse diode bridge rectifier and filtered. DC link voltage is given to an IGBT two level inverter generating 50Hz. The IGBT inverter uses Pulse Width Modulation (PWM) with 2 kHz carrier frequency. The voltage is regulated at 1p.u.(480 Vrms) by a PI voltage regulator using abc to dq and dq to abc transformation. The first output voltage regulator is a vector containing the three modulation signals used by the PWM generator to generate six IGBT pulses [8]. Figure 5: Line side converter control for isolated mode 3. SIMULATION RESULTS Before connection the MTG system to an electrical load, the performance of microturbine controller is verified by the fuzzy logic and nominal PI controller in Matlab/simulink. Form the performance test of microturbine it is ascertained that, the fuzzy logic based controller settling time is less than nominal PI controller and also the oscillation are eliminated in fuzzy logic controller. The comparison study of fuzzy logic and nominal PI controller are considered for the fuel demand, turbine torque, speed and power. The simulation is performed for a total duration of time t=80 second. The turbine is loaded in steps of half load and full load respectively. The variation of fuel demand and turbine torque with fuzzy logic and nominal PI controller are shown in Figures 6 and 7 respectively. From the reported Figures 6 and 7 it is observed that, the settling 46PDF Image | PERFORMANCE OF FUZZY LOGIC BASED MICROTURBINE GENERATION SYSTEM CONNECTED TO GRID/ISLANDED MODE
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