Which of the following are considered dynamic reactive resources?

Dynamic reactive resources are critical components used in the power system to manage voltage stability and support the grid during disturbances. Synchronous condensers and generators are particularly noteworthy for their ability to provide both real and reactive power on demand, which makes them valuable for dynamic grid support.

Synchronous condensers are essentially rotating machines that can adjust their reactive power output quickly and effectively. They help in regulating voltage levels during transient events such as faults or sudden changes in load. Generators, especially those designed for grid support, can also dynamically adjust their reactive power output to respond to grid conditions.

In contrast, capacitor banks and reactor banks, while important for static reactive power compensation, are less dynamic in their response. Capacitor banks provide a quick injection of reactive power but are limited in their ability to absorb reactive power without additional equipment. Reactor banks, used to absorb reactive power, do not have the same dynamic response characteristics as synchronous machines.

Therefore, the combination of synchronous condensers and generators represents the correct selection for dynamic reactive resources, highlighting their role as active components that can swiftly respond to changing grid conditions to maintain voltage stability.