This study deals with the development of a proportional-resonant (PR) control applied on voltage regulation and harmonics compensation of a standalone self-excited induction generator (SEIG) for micro-hydro power generation system. The generation system considers: (i) a three-phase induction generator (IG) as SEIG, (ii) which is driven by an unregulated microhydro turbine, (iii) a three-phase three-legs distribution static synchronous compensator (DSTATCOM) and (iv) linear and nonlinear loads connected to the AC bus. The voltage regulation is performed through the injection of reactive power to the AC bus through the DSTATCOM, providing excitation current to the IG. It is considered the employment of PR control techniques, which offers suitable voltage regulation through voltage harmonics compensation in the point of common coupling. Furthermore, frequency regulation is performed on the demand side by an electronic load control connected to the DC bus of the DSTATCOM. Experimental results were obtained to demonstrate the good performance of the voltage and frequency regulation, provided by the control system during transients of linear and non-linear loads.

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This paper deals with a system control for voltage and frequency regulation in stand-alone generation systems based on self-excited induction generators (SEIG). A three-wire hybrid topology composed by switchable capacitor banks and distribution static compensator (DSTATCOM) is considered. The DSTATCOM is controlled by proportional-resonantderivative (PRD) controllers in association to proportional-integral (PI) controllers in order to compensate the system reactive power, balance induction generator (IG) currents and compensate harmonic currents. An electronic load controller connected to the three-phase bus guarantee the frequency regulation by the control of active power. Experimental results are presented to demonstrate its performance.

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