Parallel ac-ac converters using master-slave control

The objective of this study is to develop a parallel ac-ac converter that can be implemented as a means of connecting ac generators in parallel. The most important goal of the parallel converter in this study is to obtain equal current sharing performance among the paralleled generators such that an economically optimal solution for production cost of electricity can be accomplished. At the same time, voltage regulation and stability of the parallel system upon changes of different sizes and load types are to be maintained.; Use of the available parallel converter method and voltage inversion technique leads to the formulation of a new solution technique for parallel operation of ac generators. The proposed parallel ac-ac converter involves Sinusoidal Pulse Width Modulation inverter combined with a control scheme called the Stationary Master-Slave control that uses voltage feedback loop and designates one generator unit as the master.; The study involves numerous computer simulations to verify the feasibility of the parallel ac-ac converters. In doing so, as many as five models are considered including Current Control Current Source model, PI model, PI-PWM model, PI-PWM model with MOSFETs, and PI-PWM model with real MOSFET model. The results of the simulations show that the parallel ac-ac converter not only successfully provides the current sharing property among the paralleled units but also maintains system stability during changes in load demand.; Further research work is suggested to address extensions to parallel ac-dc and dc-ac systems, hardware setup of at least two turbogenerators to test and verify the proposed approach, dynamic analysis to ensure system stability, and implementations of other types of Master-Slave control schemes to improve redundancy.