Enhancing voltage stability of Isolated hybrid power system with The application of optimized Controllers

Abstract

With rapid development of technology, energy demand is increasing abruptly across the globe. Power generation from renewable sources are gaining attention due to scarcity of conventional sources and global warming. Power generation from renewable energy supports isolated grid which helps in electrification of rural areas and remote locations. In developing countries like India, rural electrification is a major concern and isolated grid is one of the solutions. Major issue with isolated grid is voltage stability and reactive power compensation. In a grid connected system, increase in reactive power requirement of system will be supplied by the grid and in isolated grid additional compensating devices is to be incorporated. newlineA system exhibits voltage stability, when deviation in voltages at all buses under normal and abnormal condition is negligibly small. Due to disturbance, increase in load demand or change in system condition, if there occurs unmanageable decline in system voltage then there exist voltage instability. Characteristics of load and voltage control devices, generator reactive power limits and action of voltage control devices are the main factors contributing to voltage instability. newlinePower generation from renewable sources are most widely done with the help of Induction Generators (IG)/Doubly Fed Induction Generators (DFIG). IG s are increasingly employed in renewable power generation due to the advantages like low cost, robustness, does not require DC excitation, no synchronization problem, easy maintenance, low initial investment, self protection against short circuits and overloads. newline