Abstract |
Line commutated thyristor converters are very often used in drive engineering. But, difficulties in modeling and analysis such systems, due to thyristor converter non-linearity, are also present. In most cases in practice the change of the firing angle between two consecutive thyristor pairs activation is small, we can assume that sampling instants are equidistantly spaced in time, and linearisation around working point can be done. That leads to the Z-transform method application in the analysis of automatic control systems containing thyristor converters. The thyristor converter transfer function is presented, and stability analysis in the Z-domain of realized high speed current mean value control system by line commutated thyristor converter is given. Experimental results, i.e. system response on sudden changes in reference and load are also presented. |