Bi-Directional Power Control using Constant Frequency Hysteresis with Reduced Losses

M. Nanda Kumar and K. Vasudevan (India)


Bi-directional power control, hysteresis control, buck topology, boost topology, power system control


A simple control technique for the bi-directional power flow control between dc source and ac grid is presented. For each 60of line cycle, the 3-phase bridge is considered as parallel-connected dual buck topology in inverter mode of operation and as a dual boost topology in rectifier mode of operation. Constant frequency hysteresis current control is proposed. Low current distortion and unity power factor are achieved. The magnitude of bi directional current can be controlled. Simplicity of control circuit, considerable reduction in switching losses with excellent dynamic performance are the salient features of this control technique.

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