Analysis of A Quadratic Boost Converter Using Sliding Mode Concept

Abstract

Now a days, due to the diminution of conventional energy sources and developing environmental pollution, renewable energy sources are playing a dynamic role in generating electricity. For renewable energy systems, power electronics play a significant role and it is the most expensive part of the system. It reduces cost, increasing efficiency and improving reliability. DC-DC converters are found to have major applications in industry with the change in the technology. A DC-DC converter with a high voltage gain is desirable in many modern residential applications. Efficiency and voltage gain of conventional boost converter are restrained by either parasitic effect or reverse recovery problem and increases conduction loss, limits the power level of the conventional boost converter. Among all boost derived converters transformer less, single active switch are of more interest. In the cascade boost family, quadratic boost is a newly proposed two stage boost converter with single switch topology and shows better substitution when complexity and modulator saturation is considered. Hence a robust controller design to obtain the output voltage regulation in a quadratic boost converter with high dc gain is proposed. The controller consists of two loops, namely, outer loop that operates over output voltage error and sets the current reference value of the sliding surface. The inner loop is based on sliding mode control whose sliding surface is defined for the input inductor current. The above control loop analysis is performed using equivalent control method and the robustness is analyzed with the help of parameter variation related with different operating points. The system is simulated in MATLAB/SIMULINK and simulation results shown to satisfy the objectives of the proposed control scheme. The simulation results prove the effectiveness of the proposed controllers.