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0.5 0 -0.5 500 400 300 200 100 0 -100 -200 -300 -400 -500 1.5 1 0.5 0 -0.5 -1 600 400 200 0 -200 -400 -600 International Journal of Fuzzy Logic Systems (IJFLS) Vol.2, No.3, July 2012 negative in per unit, it means that, the PMSM is running as generator. To generate the turbine toque the proportional fuel demand and speed are shown in Figures 14 and 15. The inverter output voltage and load voltage are shown in Figures 16 and 17 respectively. From the Figures 16 and 17 it is observed that, the MTG system is supplying quality power to the grid. 1 x 104 0.5 0 -0.5 -1 -1.5 700 600 500 400 300 200 100 Active power in watts Reactve power in Var 1.015 1.01 1.005 1 0.995 0.99 0.985 0.98 0.975 012345678 012345678 Time (s) Figure.10 Actvie and reactive power Time(s) Figure.14 Turbine speed 0 012345678 Time(s) Time (s) Figure.11 DC link voltage Figure.15 Turbine torque -1 012345678 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -0.1 3.2 Isolated mode 12345678 Time (s) Figure.16 Inverter voltage 1 0 -1 2.045 2.05 2.055 2.06 2.065 2.07 2.075 2.08 2.085 -1.50 1 2 3 4 5 6 7 8 Time (s) Figure.12 Turbine torque 012345678 Time(s) Time (s) Figure.17 Load voltage Figure.13 Fuel flow The fuzzy logic controlled MTG system is connected to an isolated mode and it performance is simulated for the total duration of 30sec. The variation of turbine fuel flow and torque are shown in Figure.18 and 19 respectively. From the reported Figures 18 and 19 it is observed that, the fuel demand and turbine torque increase with increase in load and decreases with decrease in load. 48 0.6 0.4 0.2 0 -0.2 -0.40 1 2 3 4 5 6 7 8 2.55 2.6 2.65 2.7 2.75 2.8 Fuel flow (p.u) Troque (p.u) DC link voltage (V) Active & reactive power Load voltage (p.u.) Inverter voltage (V) Turbine torque(p.u) Turbine speed (p.u)PDF Image | PERFORMANCE OF FUZZY LOGIC BASED MICROTURBINE GENERATION SYSTEM CONNECTED TO GRID/ISLANDED MODE
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