Simulation of separately excited chopper controlled DC machine

Abstract

In this thesis, a novel approach for the simulatlon of a chopper-fed dc machlne, is presented. Instead of the general technique of combining the Kirchhoff's voltage, current and branch characteristic equations, which would result in an equation of the form ...., the branch currents are evaluated in terms of node voltages by applying Kirchhoff's voltage and current equations, and they are immediately converted to algebraic equations by trapezoidal formula. Later on, the nonlinearltles are considered, and thyristor and diodes are linearized by piecewise linear models. In this way, breaking down the circuit operation into different modes, which couses laborious analytical manuplation or requires long computer time, is avoided. Also, a method of obtaining the complete set of equations for any network, only by observing the topology of the circuit, is developed.