Problem 4: (a) (15 points): The parameters corresponding to…

Problem 4: (a) (15 points): The parameters corresponding to a single PV cell at STC (1000 W/m2) are: Reverse saturation current, Io : 10-8 A, short circuit current, ISC: 9 A, thermal voltage, Vth  : 25.8mV.  The series and shunt resistances are neglected.  When 60 such cells are connected in series and operated under 750 W/m2 irradiance with the total voltage across the string maintained at 30 V, calculate the terminal (load) current and the power delivered to the load.   (b) (10 points): In a three-phase system the d and q axis voltages and currents respectively are as follows: vd = 500 V, vq = 0, id = 50 A, and iq = 50 A.  Calculate the peak value of phase a current, and calculate the active power and reactive power corresponding to this system.