Load powerworld simulator case problem 6_46. plot the reactive power output of the generator at bus 2 as a function of its voltage setpoint value in 0.005 p. u. voltage steps over the range between its lower limit of 250 mvar and its upper limit of 50 mvar. to change the generator 2 voltage set point first select tools, play to begin the power flow simulation, and then click on the up/down arrows on the bus 2 magenta voltage setpoint field