Parallel operation of induction generators in grid-connected micro-hydro systems

This paper presents a novel experimental approach for grid integration of parallel-connected induction generators (IGs) with different power ratings (2.2 kW and 5.5 kW) in micro-hydro power plants, eliminating the need for power electronics converters. A comprehensive steady-state mathematical model using per-phase equivalent circuits is developed, with system equations solved efficiently through the lower–upper (LU) decomposition method in MATLAB. Three experimental scenarios validate the approach: IGs at different slips, identical slips, and variable speed operation. Results demonstrate that identical slip operation (Case B) achieves optimal performance with 5,262 W active power generation, a 126% increase over the different slip operation, and 2,618 VAR reactive power consumption, representing a 15% reduction. The methodology effectively reduces inrush currents during grid connection, maintains voltage stability within ± 5% tolerance, and improves power factor from 0.76 to 0.95. This cost-effective solution advances renewable energy integration for remote applications without complex power electronics.