Repeat Problem 12.7 if the frequency decreases by 0.005 per unit. Determine the MW increase of each unit.

Data From Problem 12.7:-

Each unit in Problem 12.5 is initially operating at one-half its own rating when the frequency increases by 0.005 per unit. Determine the MW decrease of each unit. The reference power setting of each turbine-governor is fixed. Neglect losses and the dependence of load on frequency.

Data From Problem 12.5:-

An area of an interconnected \(60-\mathrm{Hz}\) power system has three turbine-generator units rated 200, 300, and \(500 \mathrm{MVA}\). The regulation constants of the units are 0.03, 0.04, and 0.06 per unit, respectively, based on their ratings. Each unit is initially operating at one-half its own rating when the load suddenly decreases by \(150 \mathrm{MW}\). Determine (a) the unit area frequency response characteristic \(\beta\) on a 100-MVA base, (b) the steady-state increase in area frequency, and (c) the MW decrease in mechanical power output of each turbine. Assume that the reference power setting of each turbine-governor remains constant. Neglect losses and the dependence of load on frequency.