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This paper analyzes distinct digital sensorless control systems used to regulate and to suppress harmonics on the output voltages of a self-excited squirrel-cage induction generator in isolated systems under nonlinear loads. A normalized discrete model of the inverter operated as static VAr compensator and active power filter are presented considering its implementation in a DSP TMS320F2812. Furthermore, the voltage detection method and the robust deadbeat current control applied to three-wire systems are used. Simulation and experimental results are included to demonstrate the performance of output voltages in the self-excited induction generators.