A PWM control for electronic load controller for self-excited induction generator based in IGBT series-inverted switch

This paper is aimed to the design of an improved electronic load controller for a self-excited induction generator (SEIG) on stand alone applications. With constant input power and a fixed value of capacitance, the generated voltage varies with the applied load. In applications of up to 100 kW, uncontrolled turbines are preferred, which maintain the input power constant, thus requiring the generator output power to be maintained constant at varying consumer loads. A dump load in shunt with the consumer load is necessary to maintain the electrical load constant at genrator´s terminals. This paper proposes an improved ELC scheme whose control strategy is simple and reliable. Series-inverted IGBT switches are used to control the connection or disconnection of the dump load The ELC proposed was tested under critical situations in which it provided an excellent voltage and frequency regulation. Lastly a harmonic analysis was carried out to determine the total harmonic distortion.