In the modern electrical power system, the generator excitation systemis maintains the synchronous generator movement the stability,enhances the electrical power system security, the economical movement level important link. But generator excitation system itself system huge, the theory is strong, how causes it to be advantageous for in the movement main tenance studies and grasps, is a count for muchtopic.
This article in the analysis synchronous generator excitation principle foundation, analyzed the controllable levelling circuit into be normal with emphasis and each kind of unusual situation profile output situation, passed through the VB simulation, has obtained time the corresponding different control angle actual output profile, has solved when the scene controllable levelling circuit overhauled,difficulty with diagnosis type actual problem.
Key Words： electric power system, synchronous generator , excitation system , simulation
