Adaptive time optimal control of thyristor converter current

Based on a fast online parameter estimation algorithm, a new adaptation procedure, applied to the time optimal current control of a thyristor converter loaded with a DC motor, is presented. A time optimal current control algorithm ensures that in the case of rated system parameter values a new steady state value is reached within a single current pulsation even when operating modes (continuous, discontinuous) are changed. In case of changed system parameter values, the proposed adaptation mechanism enables the current response to be completed within two current pulsations, thus keeping it time optimal and making it insensitive to parameter variations. Estimation and adaptation algorithms were verified by computer simulation and the results obtained are presented