Słowa kluczowe: small hydropower plants, propeller turbine, PM generator, matrix converters, symmetrical components, equivalent circuit, genetic algorithm, model of sensitivities to the initial state, DWT, DFT, wavelet function, short circuit, short circuits in transmission line, models of double sourced transmission line, data bases of short circuit performanc, steady state, synchronous machine, Fourier spectrum, induction motors, diagnostics, wavelet analysis, Induction machine modelling, Magnetic saturation, MATLAB-SIMULINK, Sim-Power-Systems, Propeller turbine, control algorithm, small hydropower plant, control and monitoring system