Adaptive Control of a Synchronous Generator

Abstract

Theoretical aspects are based on PARK's equations while the experimental part is achieved from on-line machine frequency responses on small signals for different active or reactive powers. The concordant results show that a third order multi-input-multi-output non minimum phase system characterizes correctly the dynamic behaviour of the synchronous machine and that this system varies greatly with the load.The system characteristics militate in favor of using an adaptive controller.It is the subject of the second part of the paper.The numarical controller is composed of two parts. The first one is concerned with the static non-linear behaviour of the system.The second one must correct the defectiveness of the static model and stabilize the system around a steady state point defined by the same static model.This dynamic control part is getting more complex, as the controlled system is multi-input-multi-output, depends on steady state point, and has sometimes a non-minimum phase behaviour. The chosen control structure is of parellel type, with a memoryless direct action in order to compensate the secondary effects of parametric adjustings and to account implicitely for the strong non linearities of the command. Examples of synchronous machine simulation show the good behaviour of the control system in case of minimum phase.