Analysis of bifurcation behavior in a current-fed boost converter for PV systems

In most power electronics applications, the input is a voltage source and it is required to control the output voltage to a desired value. In photovoltaic (PV) applications, the control of the input voltage of the converter is frequently required to extract the maximum power from the PV panel. Moreover, unlike the conventional case, the output voltage is constant. This paper presents an analysis of nonlinear dynamics and bifurcation behavior of a current-fed boost converter for PV applications. First, a discrete-time model of the converter is derived. Simulation results using this model show that the system can exhibit period doubling bifurcation when some design parameters are varied. Then, the monodromy matrix obtained from Floquet theory and Filippov method is used to perform a stability analysis of the system periodic orbits and to explain the mechanism of losing their stability.