Modelling, analysis and control of stand-alone self-excited induction generator-pulse width modulation rectifier systems feeding constant DC voltage applications

An analogue-based pulse width modulation (PWM) hysteresis current mode controller has been developed for the stand-alone operation of self-excited induction generator (SEIG)-PWM rectifier systems for constant DC voltage applications. The configuration and implementation of the control scheme have been fully described. A method for predetermining the steady-state performance of the system for a given rectifier DC output has been explained with relevant analytical expressions derived for suitably reflecting the DC load resistance on the generator terminals. An `abc-dq´ axis model has also been formulated for the study of transient behaviour of the system for step changes in the driving speed and DC load on the system. A prototype system consisting of an SEIG, rectifier and the associated control circuits has been built in the laboratory and its satisfactory working has been demonstrated experimentally, for the different loading patterns and the corresponding predetermined results are also provided.