What is the difference between "Load angle" and "rotor angle deviation" in Synchronous generator?

Hi I am doing a simulation of small network contains a number of generators, the measurement port of synchronous generator gives two angle (Load angle) and (rotor angle deviation).

what is the difference between them? and which one of them we can consider as a rotor angle (for rotor angle stability study)?

Answer 1

[Joel Van Sickel]

load angle refers to how much power is real/reactive where the rotor angle deviation is the mechanical rotation.