Modelling and analysis of parallel connected permanent magnet synchronous generators in a small hydropower plant
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The simulation of parallel operation of grid connected permanent magnet synchronous hydro-generators with damper using MATLAB/Simulink is presented. The mathematical model of the synchronous generator in terms of two axes d-q variables is used. The hydro-turbines connected to each PM generator in a so-called matrix arrangement give input shaft torque to the rotor of each PM generator. Matrix like arrangement of these small turbine generator units allows generation of electric power from waste water in river barrages, but needs parallel operation of the machines. The influence of changing operating conditions like sudden load change, blocking of rotor of a generator and three-phase short circuit are investigated for parallel operation of four machines. Investigations are done for 300 kVA, three-phase, 24 poles, 1.9 kV permanent magnet synchronous generators. All stationary results obtained are verified by analytical calculations.