What is 0 droop also known as?

0 droop refers to a condition in power systems where there is no decrease in generator output frequency as the load increases. This condition is critical for maintaining a constant frequency in power generation systems, particularly in synchronous generators. The term "isochronous" specifically describes a governor control setting where the generator maintains a constant speed, regardless of variations in load, thereby avoiding frequency fluctuations.

In isochronous mode, the system automatically adjusts fuel or input to the generator to compensate for load changes, ensuring that the output frequency remains steady. This is vital for grid stability, especially in synchronously connected systems where many generators operate in parallel.

The other terms describe different aspects of electrical generation or operation. "Constant voltage" refers to maintaining a stable voltage level, which is different from maintaining frequency. "Fixed speed" often implies that a generator runs at a predetermined speed, but this can vary under load, differing from the isochronous concept. "Stable condition" is too vague and does not specifically address the unique control aspects involved with droop characteristics in power systems.