STEADY-STATE ANALYSIS OF WELDING STAND ALONE INDUCTION GENERATOR WITH INVERTOR EXCITATION USING EQUIVALENT CIRCUIT MODEL

Abstract

This paper deals with analysis of welding stand-alone induction generator with inverter excitation using equivalent circuit model. For excitation system representation variable capacitor and two active resistances is used. It's shown to calculate impedance of magnetizing branch it is necessary operate with open circuit characteristic and values of dc side voltage and current. An analytical expression for slip meaning is obtained from active power balance equation that is useful to study generator performance. The formulas give the values of minimum dc side load resistance and the range of sleep for which inverter self excitation appears. It's used to obtain nominal welding current, maximum dc side voltage and operation region where stator current is less than nominal value and stable operation is guaranteed. References 2, figures 2.