What characterizes a synchronous generator?

A synchronous generator is characterized by its operation at a constant speed while maintaining synchronization with the electrical grid's frequency. This means that the generator's rotor speed is directly linked to the grid frequency, ensuring that the electrical output is consistent and stable. Synchronous generators are typically used in power plants and are essential for maintaining the stability of the electrical grid because they can adjust their output to match the load on the system.

In contrast, other types of generators, such as induction generators, may operate at variable speeds and can experience a drift away from synchronization with the grid frequency. Additionally, synchronous generators do not produce direct current; they create alternating current, which is essential for the transmission and distribution of electricity in most power systems. Therefore, the defining feature of the synchronous generator is its ability to maintain a fixed rotational speed that aligns with grid frequency, ensuring reliable power generation and grid stability.