Grid Connected Unsymmetrical Two-Phase Induction Generator System Using Time-Based Unbalanced Space Vector PWM and Adaptive Hysteresis Band Current Control

This paper presents performance analysis of a single-phase grid conneted unsymmetrical two-phase induction generator. A voltage doubler bidirectional AC-DC converter for a grid side allowing regenerative operation is controlled by an adaptiptive band hysteresis current controller in order to improve power quality particulrly a reduction in current ripple. For a machine side, a two-phase three leg voltage source converter with time based space vector PWM offers unbalanced orthogonal two-phase voltages for variable frequency excitation to enhance performance of the generator compared with balanced ones. Comparative performance analysis between time-based space vector PWM schemes for both balanced and unbalanced two-phase voltages using both simulation and experiment is demonstrated under various operating conditions. The simlation and experimental results are in good agreement. It is found that the unbalanced space vector PWM outperforms balanced one over a wide range of operation.