Feedback control and simulation of DC-DC Cuk converter for solar photovoltaic array

Abstract

The DC-DC Cuk converter is a combination of a cascade connection of the boost converter and the buck converter having a coupling capacitor to transfer the energy. The non-isolated Cuk DC-DC converter are having fourth-order and nonlinear dynamic characteristics and it's advantages mainly include the use of fewer number of switches, smooth input as well as output current and magnetic component integrability. Solar Photovoltaic array has variable power production based on irradiance and temperature of solar cell. To control the output, the Cuk converter is analyzed using state space equations and tested for its stability analysis. The simulation has compared the system with a compensation scheme to minimize output voltage deviation in response to change in the input voltage of the system. Using this configuration, it requires only voltage sensor and non-requirement of the current sensor. Various issues concerning the controller design like the detailed stability and feasibility analysis are also discussed to get some insight into the controlled system. Using state space equation method, the transfer function is derived and simulated in Matlab and judged the stability of whole system.