A Hybrid Solution for Load-Commutated-InverterFed Induction Motor Drives (to continue)

V. EXPERIMENTAL RESULTS Fig. 13. Output current waveforms of the proposed system at steady state at(a) 20 Hz, (b)40 Hz, and (c)60 Hz(upper trace: LCI output current [1 A/div); middle trace: VSI output current(1 A/div); lowertrace: motor current(1 A/div)].

To validate the proposed topology and control algorithm, the prototype hybrid system was developed using an LCI, a phasecontrolled rectifier, and a VSI. An insulated- gate-bipolar-transistor （IGBT）-based commercial inverter （SEMIKRON） was used as a VSI. In addition, a prototype of a phase-controlled rectifier and an LCI was fabricated in the laboratory.