| Abstract |
A three-phase dc-link, IGBT, PWM converter was formerly in detail studied. The applied control strategies used all the allowed switching opperations of the semiconductor devices such that the converter has a line-friendly performance. High dynamic and satisfactorily steady-state performances of the converter were obtained.Simulated results and careful experiments indicate a relatively significant dc-voltage drop at the output of the converter
when the lead changes. In order to minimize this important modification of the dc-voltage level, more complex control strategies were studied. The desired line-friendly operation mode is kept active only for the lead values that are less as a prescribed one. If an overload appears, in motoring or generatering operation mode, nonactive power is generated, so that the dc-link voltage is kept constant.The paper deals with this control strategies and analyses comparatively the converter performances. |
