COMMUTATION IN INVERTORS UNDER STEADY-STATE AND TRANSIENT CONDITIONS

Abstract

For stable operation of an invertor, a certain amount of reactive power is necessary. The count of reactive power depends mainly upon the overlap angle y . As a matter of fact, this overlap angle is affected by various system pore- meters and load conditions. In this dissertations the effect of various system parameters and load conditions on reactive power demand has been studied. it also deals with the use of capacitors and filter circuits for reduction of commutation engi. and hence the reactive power consumption. Relative advantages and dis- advantages have been assessed. flifferent aspects of commutation failure and protection against it has been discussed. The effect of faults on the s.c. side on the reactive power demand has been studied. The variation of current in an invertor under different transient situation. has been analysed. In each case a suitable example has been assumed and analysed