Which components are categorized as dynamic reactive resources?

Dynamic reactive resources are crucial for maintaining voltage stability and responding to rapid changes in system load or generation. In this context, the correct answer highlights dynamic reactive components that can both absorb and provide reactive power to the electric grid as conditions fluctuate.

A synchronous condenser and generator fit this definition. A synchronous condenser is essentially a synchronous machine that provides reactive power support, which is essential for voltage regulation. It can quickly adjust its reactive power output to counteract voltage fluctuations. Similarly, a generator can be operated at varying excitation levels to produce or absorb reactive power, helping to stabilize the grid during dynamic events like sudden load changes or generator outages.

In contrast, while other choices may include components that perform some reactive power functions, they may not fit the definition of dynamic reactive resources as effectively. For instance, a capacitor bank primarily provides reactive power support but does not dynamically respond in the way a synchronous machine does. Similarly, a transformer, while critical for voltage regulation in a transmission system, does not provide dynamic reactive power support.

Thus, the components that fall into the category of dynamic reactive resources are properly identified as the synchronous condenser and the generator, both of which effectively manage reactive power to support grid stability.