Evaluation of synchronized operation of isolated induction generator with DSP based Generalized Impedance Controller

Performance evaluation of an isolated wind/hydro electric generation scheme having variable speed 3-phase Self Excited Induction Generator (SEIG) operating in synchronism with a Generalized Impedance Controller (GIC) has been presented in this paper. The GIC is an impedance controlled operation of Pulse-width-modulated voltage source inverter (PWM-VSI). The performance of the SEIG-GIC integrated synchronized operation under open loop condition, with fixed excitation and balanced isolated load, has been analyzed in detail for variations in modulation index ‘m’ of the GIC and relative phase angle ‘δ’ between the fundamental components of the GIC and the SEIG terminal voltages. The GIC operation is controlled by implementing Space Vector Pulse Width Modulation (SVPWM) technique. Detailed experimental studies have been undertaken on a laboratory prototype of the SEIG-GIC system for steady state operation. The effects of variations in ‘m’ and ‘δ’ on the amplitude and frequency of the SEIG terminal voltage and active and reactive power flow between the SEIG and the GIC are presented here.