Analysis and control of three-phase SEIGs supplying battery charging loads through single-phase converters

A method employing Genetic Algorithm (GA) has been applied for the analysis of three-phase self-excited induction generators supplying battery charging load through single-phase semi-converters. The battery circuit is represented as equivalent resistance and reactance in the equivalent circuit of the generators and such equivalent values are functions of the dc charging voltage, current and control angle set in the converter. Apart from the conventional Phase Angle Control, other firing control schemes namely Extinction Angle Control and Symmetrical Angle Control have been considered for the operation of the converter. The suitability of each of these control schemes for specific load conditions is discussed with examples. Experimental results obtained on a three-phase SEIG charging suitable batteries through a single-phase IGBT based semi-converter, controlled with all these schemes, confirm the usefulness of the proposed system and the validity of its analysis.