Determining the optimal operating point of an induction generator [Elektronski vir]
Ropoša, Silvo ; Štumberger, Gorazd
The work deals with a wound rotor induction machine operating as a generator. A wind or water turbine is normally mounted to its shaft. The rotor winding is fed by a voltage source inverter while the ...stator winding is connected to the electric grid. Optimal operating points of the system consisting of an induction generator and voltage source inverter are evaluated by a stochastic search algorithm called differential evolution. The optimization objective is to find operating points with the best efficiency of the system as a function of the shaft speeds and delivered mechanical power. In order to perform the optimization a magnetically nonlinear two-axis induction machine model oriented with the magnetizing current vector is applied. The same mathematicalmodel of induction machine and the same optimization method is used for determining the optimal operating points of the same machine operating as an induction motor. The proposed method is appropriate to be applied in the systems, where the same induction machine feed by the voltage source inverter is applied as a generator and also as a motor. The magnetic nonlinear behaviour of the discussed induction machine, operating as a generator and as a motor, is accounted for by the current dependent flux linkage characteristic. Voltage and current limits of the induction machine and voltage source inverter are used as optimization bounds. The optimization is performed in the program package Matlab.
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