A NEW DYNAMICAL MODEL OF RECTIFIED OUTPUT AC GENERATORS

This paper is devoted to the statement of a new method for studying the dynamical behaviour of rectified output AC generators, The association synchronous machine-rectifier is considered as a whole and analyzed as a commutator DC machine with mobile brushes. The general equation of sliding contacts circuits is applied to work out the electrical equations of the generator and the relation defining the position of the brushes of the equivalent DC machine. Saturation effects are introduced by the classical Rothert method. The equations are used to analyse the steady-state and transient behaviour of a three-phase, round-rotor synchronous machine connected through a bridge rectifier to an inductive load. The theoretical results are compared with experimental measuremements, a good agreement is obtained for steady-state and transients. The non-linear differential equations set describing the system can be linearized to work out its transfer function and analytical stability conditions, these results are useful for the study of excitation systems.