Fault tolerant peak current mode controlled flyback converter for solar PV modules

Abstract

This paper proposes a novel scheme for the fault detection in a DC-DC converter connected to a solar PV module with the help of a proposed state machine based model. This scheme can be practically employed by applying Peak Current Mode (PCM) control technique with an excessive ramp signal. Flyback topology having low cost, minimal components which provides isolation too is being selected over other topologies. By employing PCM on the Flyback converter, dynamics has been controlled both at the input and output terminals because of the position of inductor at input node. Stability analysis has been explained with help of Bode plots of system transfer function clearly showing the removal of RHS pole which occurs due to solar PV as input source. A 60 W hardware protype of Flyback converter has been built to test the proposed scheme. Results clearly show the generated outputs with a better cross regulation over a Vpv range of 60-120V.