especially in the already running industrial plants. Concerning the large power demand of these motors and the high level of low order harmonics injected by the conventional converter used, many solutions are tested and implemented. In this paper an upgrading scheme for driving the separately DC-motor in the four quadrants is suggested. The power circuit used is based on PWM voltage source converter (VSC) capable of bidirectional power flow with controllable power factor and pure sinusoidal supply currents. The drive details are presented and its performance is investigated via simulation work. A comparison of performance of the suggested scheme and the conventional scheme shows that the suggested one can economically replace others with valuable contribution to power factor improvement and harmonics reduction in power system.