Advanced non-inverting step up/down converter with LQR control technique

This paper proposes a new topology of non inverting buck-boost converter. This topology is composed of a boost converter which is followed by a buck converter through a magnetic coupling. A series resistor with capacitor is considered in the boost part to enhance the dynamic of the converter. The advantages of proposed topology are smaller capacitors size, higher bandwith and faster response compared to conventional non inverting buck-boost topologies. Non-ideal DC and AC models of the converter are obtained to analysis the dynamic of the converter with more accuracy. A control algorithm is developed based on LQR method to regulate the output voltage of the converter. This controller is more robust compare to conventional controller. PSCAD/EMTDC software is used to evaluate and verify mathematical model results and simulated circuit model.