Neural Network Implementation of a Three Phase Regulated PWM AC to Dc Convener with Input Unbalance Correction

Under unbalanced supply condition low order harmonics will appear at the input and output terminals of the PWM AC to DC converter. Based on the positive and negative sequence components, an unbalanced transfer matrix in terms of the input phase voltages is derived. An on-line method using a neural network (NN) is used to implement this transfer matrix. It is shown that by using an additional load feedback loop the unbalance correction property is not affected.