What is the purpose of increasing MVAR output in a generator?

Increasing MVAR (megavolt-ampere reactive) output in a generator serves the primary purpose of providing voltage support within the power system. Reactive power is essential for maintaining voltage levels across the electrical grid, especially during periods of high demand or when there are fluctuations in load. By supplying additional MVARs, generators can counteract voltage drops and help stabilize the system, ensuring that voltage remains within acceptable limits for both transmission lines and connected loads.

This is particularly crucial in maintaining system reliability and preventing cascading failures that can lead to outages. In contrast, the other options address issues or concepts that are not directly related to the function of reactive power in voltage management. For instance, while alleviating temperature concerns or addressing frequency and harmonic distortion might be important in certain contexts, they do not directly link to the role of MVARs in voltage stabilization. Thus, increasing MVAR output is fundamentally tied to enhancing the voltage support capability of the power system.