Correlation of Dynamical with Steady State Properties of Converter Fed Drives

Abstract

In the paper the analysis of the correlation of dynamical with steady state properties of the converter fed drives is presented. The analysis, based on the equations of the system, is made for the self commutated synchronous motor (SCSM), called also as the load commutated inverter fed synchronous motor (LCI-SM). First, the requirements of suitable acceleration of the drive and ratio of current increase during the dynamical state are transposed to the adequate commutation and control reserves of the converters. Then the influence of the reserves, kept in the steady state, on torque versus current characteristic, maximum available torque (overload capacity), selection of current limitation, power factor, loss and efficiency of the drive is analyzed. The obtained dependencies are illustrated in figures and with use of a number data. In the paper the deterioration of the steady state properties with increase of dynamics of the drive is concluded