LQ-optimized multivariable control for a single-phase 50-kW, 16.7-Hz railway traction line-side converter

Line-current harmonics and grid stability are major concerns for the control of a traction vehicle line-side converter. To achieve best dynamic performance the resonant circuit taking up the single-phase power pulsation has to be considered. This paper describes the derivation of a linear-quadratic (LQ)-optimized multivariable control fulfilling these requirements. Excellent operation is verified by measurement results.