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[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Fig 2: Methodologies applied for bearing diagnosis. Electric Utility Fig 1: Connected Microgrid system based in power electronic interfaces. Microgrid ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Fig 3: the equilibrium point X0 the range of the variable X5 ,[object Object],MATHEMATICAL MODEL INTRODUCTION Variable Value Unit Operating Voltage range 218,5 – 241,5 Vrms Operating Frequency range 49 - 51 Hz Freq. droop coefficient (K p1  = K p2 ) 1,33e-4 rad.s -1 /W Voltage droop coefficient (K v1  = K v2 ) 0.0015 V/VAR Cutoff frequency filter 5 Hz
[object Object],[object Object],[object Object],Fig 4:  Root locus for 1.3e-4< Kp <7.8e-4 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Where Fig 6:  phase portrait in Z1 –Z2. (x=Z1 y=Z2) ,[object Object],Fig 5:  Function  f(Z 1 )   ,[object Object],Fig 7: Active Power dispatch by each DGs when it is increase the Kp Fig 8: two large disturbances in the Microgrid. STABILITY OF THE SYSTEM CONCLUSIONS

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Transient stability analysis of inverter interfaced distributed generators in a microgrid system

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