Open PowerWorld Simulator case Problem 12_10. The case models the system from Example 12.4 except 1) the load increases is a \(50 \%\) rise at bus 6 for a total increase of \(250 \mathrm{MW}\) (from \(500 \mathrm{MW}\) to \(750 \mathrm{MW}\) ), 2) the value of \(\mathrm{R}\) for generator 1 is changed from 0.05 to 0.04 per unit. Repeat Example 12.4 using these modified values.

Example 12.4

An interconnected \(60-\mathrm{Hz}\) power system consists of one area with three turbine-generator units rated 1000,750, and \(500 \mathrm{MVA}\), respectively. The regulation constant of each unit is \(\mathrm{R}=0.05\) per unit based on its own rating. Each unit is initially operating at one-half of its own rating, when the system load suddenly increases by 200 MW. Determine

(a) the per-unit area frequency response characteristic \(\beta\) on a 1000 MVA system base,

(b) the steady-state drop in area frequency, and

(c) the increase in turbine mechanical power output of each unit. Assume that the reference power setting of each turbine-generator remains constant. Neglect losses and the dependence of load on frequency.