Theory, Simulation and Experimental Verification of a New Integral Cycle Robust Control Strategy for Self Excited Induction Generators

This paper presents a new control strategy based on integral cycle control of the excitation capacitors to achieve excellent voltage regulation for all types of loads including direct on line starting of induction motors. The integral control strategy not only eliminates switching harmonics but also the requirement of exactly sized capacitors, which are hard to procure. In addition the implemented system is self starting without the need of any external energy source/storage. The paper presents simulation and experimental results both of which show excellent voltage regulation that can be obtained at any desired operating point on the magnetization curve of the core material including the linear region, a region where no operation was possible using the previously available control methods.