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International Journal of Fuzzy Logic Systems (IJFLS) Vol.2, No.3, July 2012 The variation of turbine speed due to the increase and decrease of load on the MTG system is shown in Figure. 20. The active and reactive power is one of the important parameters of MTG system in connected to the load. Since the MTG system power generation by PMSM, it can supply only the active power. it is observed from the reported Figure.22. It has been measured between phase to ground voltage and current. The variation of load voltage and current between phases to ground is shown in Figures 23 and 24 respectively. From the reported Figures 23 and 24 it is observed that, the variation of load voltage and current maintains the power quality. 0.7 0.6 0.5 0.4 0.3 0.2 0.1 00 2 4 6 8 10 12 14 16 18 20 Figure.18 Fuel demand 14000 12000 Reactive power in Var 10000 8000 6000 4000 2000 0 -20000 2 4 6 8 10 12 14 16 18 20 Time (s) Figure.22 Active and reactive power Time (s) 0.6 0.4 200 0.2 0 -0.2 -0.40 2 4 6 8 10 12 14 16 18 20 1.005 1 0.995 0.99 0.985 0.98 100 -100 -200 -100 -200 Time(s) -3000 2 4 6 8 10 12 14 16 18 20 Figure.19 Turbine torque Time (s) 0.9750 2 4 6 8 10 12 14 16 18 20 Figure.20 Turbine speed 4. CONCLUSIONS -40 0 2 4 6 8 10 12 14 16 18 20 Time (s) Figure.24 Load current Time (s) The Fuzzy logic controlled MTG system connected to the grid and isolated load has been implemented and simulated using Matlab/Simulink. Initially the microturbine controller verified by the both nominal PI controller and fuzzy logic controller. Form the simulation study, the fuzzy logic controller is preferred over a nominal PI controller due to minimum oscillation and steeling time. The fuzzy logic based verified microturbine is used for the MTG system in connected to the grid and isolated model of operation. The developed model of MTG system includes microturbine, PMSM and power electronics interfacing circuit. From the simulation study of the MTG system is supplying power to the grid and the performance of load fallowing character is ascertained. The fuzzy logic controlled MTG system will maintain the quality power and fewer harmonic. From the simulation study it is observed that, the active and reactive power injected by the MTG system for grid connected as well as isolated mode of operation. 49 300 Active power in kW 300 200 200 100 100 000 -100 -200 -300 4.97 4.98 4.99 5 5.01 5.02 5.03 14.96 14.97 14.98 14.99 15 15.01 15.02 15.03 15.04 Figure.23 Load voltage 40 30 20 50 10 40 0 -10 -20 -30 20 00 -20 -40 -50 9.98 9.99 10 10.01 10.02 10.03 14.98 14.99 15 15.01 15.02 Turbine speed (p.u) Turbine torque (p.u) Fuel demand (p.u) Load current (A) Load voltage (V) Active & reactive powerPDF Image | PERFORMANCE OF FUZZY LOGIC BASED MICROTURBINE GENERATION SYSTEM CONNECTED TO GRID/ISLANDED MODE
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