Summary This article describes an accurate steady‐state analysis of a stand‐alone 3‐phase self‐excited induction generator (SEIG). This analysis, based on the Newton‐Raphson algorithm, has shown that the system performance is greatly affected by the parameters related to the availability of primary energy, load variations, and excitation capacitor values. These parameters explain the stator voltage fluctuations and the output frequency decrease. To avoid any interruption of the excitation process and to ensure a good quality of the stand‐alone minigrid, a three‐phase voltage regulator (TPVR), based on switched capacitors, is proposed to keep the terminal SEIG voltage constant. The control algorithm and the regulation process are implemented using a microcontroller. The SEIG‐TPVR is experimentally developed, and a variable capacitor bank is constructed. The experimental investigations on a 1.5‐kW induction machine confirm the efficiency of the whole suggested system.

This paper presents a loaded SEIG system controlled by a FC-TCR which consists of a big fixed capacitor in parallel with a thyristor controlled reactor in series with a fixed inductance. The output frequency is regulated thanks to the TCR branch by compensating either the excess or the lack of the reactive power system which depends on the load conditions and on the prime mover This control method was preceded by a static steady method that have determined accurately the required excitation capacitor value for each desired load power. The control strategy is implemented using MATLAB/Simulink.

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