To increase reactive power with the generator closed, what setting should be adjusted?

Adjusting the Auto Voltage Regulator (AVR) setting is the correct approach to increase reactive power with the generator closed. The AVR controls the output voltage of the generator and thereby regulates the excitation system, which directly influences the reactive power output. When the generator is in operation and closed to the electrical grid, if you need to increase the reactive power produced by the generator, raising the AVR setting will increase the excitation current, thereby allowing the generator to supply more reactive power to the grid.

Increasing the excitation increases the terminal voltage of the generator and enhances its ability to supply reactive power, which is crucial in maintaining voltage levels and supporting the power system during varying load conditions. This is particularly important in scenarios where there is a need to support voltage levels under varying loads or to provide reactive power for inductive loads.

Other choices, while relevant to different aspects of generator operation, do not directly address the mechanism by which reactive power output is increased in this context. The frequency setting, for instance, is typically fixed and is not adjusted for reactive power control. The load factor and power factor correction relate to overall system efficiency and power factor management, respectively, but do not specifically control the generator's reactive power output in the same manner as adjusting the AVR setting.