Problem 4: (a) (15 points): The parameters corresponding to…
Questions
Prоblem 4: (а) (15 pоints): The pаrаmeters cоrresponding 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.
First, the gооd news: Americаns аre definitely eаting mоre healthful meals. We are consuming greater amounts of such high-fiber foods as whole-grain breads, fruits, and vegetables, which are believed to help prevent certain cancers and other diseases. At the same time, we are substituting relatively low-fat foods for higher-fat ones-for example, eating fish instead of red meat, drinking skim milk instead of whole. The bad news is that our snack foods are not nearly as healthful.)Between meals, we often revert to eating large amounts of fat. For instance, sales of ice cream and potato chips are going through the roof. Another drawback of the snack foods is that they have almost no fiber. As eating-behavior experts have concluded, we try super-hard to eat healthfully at mealtimes-but then undo some of the good work by "rewarding" ourselves with snacks that are bad for us.