An area of an interconnected 50 hz power system has two turbine- generator units rated at 500 and 1000 mva. the regulation constant of the units is 0.05 per unit based on their ratings. each uni is initially operating at 50% of its own rating when the load suddenly increases by 250 mw. assume that the reference power setting of each turbine-governor remains constant. neglect losses and the dependence of load on frequency. determine: (i) the unit area frequency response characteristic on a 100 mva q3. (a) base. (i) the steady-state change in area frequency in hz. (iii) the change in mechanical power output of each turbine in mw 30% (b) list and briefly describe five methods to improve power system stability. 25%