Title :
Extended control strategy for a PWM line-friendly AC-to-DC converter
Author_Institution :
Tech. Univ., Cluj, Romania
Abstract :
A three-phase DC-link, IGBT, PWM converter was studied. The applied control strategies used all the allowed switching operations 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 load 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 load values that are less than the prescribed one. If an overload appears, in motoring or generating operation mode, nonactive power is generated, so that the DC-link voltage is kept constant. The author deals with these control strategies and analyses the converter performances
Keywords :
insulated gate bipolar transistors; power convertors; pulse width modulation; switching circuits; AC-to-DC converter; DC-voltage drop; IGBT; PWM; control strategy; dynamic performance; semiconductor devices; steady-state performances; switching operations; three-phase DC-link;
Conference_Titel :
Power Electronics and Applications, 1993., Fifth European Conference on
Conference_Location :
Brighton