Fuel-efficient induction generator based diesel generator set for stand-alone supply systems

Abstract

This article proposes a fuel-efficient, diesel engine driven, self-excited induction generator based diesel generator set for stand-alone supply systems. The system uses a static compensator along with a battery energy storage system. The static compensator with a battery energy storage system provides the voltage control, load compensation, harmonics elimination, load balancing, and reactive power compensation. The fuel efficiency of the generator is improved by loading the generator continuously between 80% and 100% of its rated capacity. The battery energy storage system takes the power from the generator during light load periods and supplies the power to the load during overloads. In addition, a continuous loading of the generator eliminates the problem of frequency variation of the induction generator under varying loads. The proposed system is designed to feed both three-phase as well as single-phase loads. A zigzag transformer is used for neutral current compensation. A power balance theory based control algorithm has been used to estimate the reference source currents.