Modeling and stability analysis of enhanced gain active switched inductor impedance source non-isolated DC to DC converter for PV applications

Abstract

The power generated from a solar panel installation needs to be controlled and increased using a large voltage gain DC–DC converter. This study delves into an innovative high gain, non-isolated DC–DC converter, referred to as the active switched inductor impedance source converter (ASIZSC). The converter includes several essential features that enhance its functionality such as improved gain, constant input current, low duty ratio, and reduced voltage stress on circuit elements. Three switches are present in the proposed converter. The duty ratio and switching frequency used to operate all three switches in the converter are similar. Simulation in MATLAB is used to confirm the functioning of the suggested converter. The simulation is carried out for a source voltage, \(V_i\) of 10 V, a load power of 100 W, duty ratio, \(\delta \) of 0.4, and switching frequency, \(f_s\) of 50 kHz. Hardware results as well as simulation data are given to support the effectiveness of the recommended converter. The load voltage is 120 V for a 10 V source voltage. The gain of the recommended converter is 12. To improve the dynamics of the converter, a closed loop system is developed. The designed closed loop system is simulated to verify its functionality. The viability of the MPPT operation of the ASIZSC in the photovoltaic application is confirmed through the MATLAB simulation.