Integration of cascaded controllers for super-lift Luo converter with buck converter in solar photovoltaic and electric vehicle

Abstract

Power electronic converters are utilized to regulate the charging voltage of electric vehicles (EV) batteries based on photovoltaic (PV), ensuring it falls within the desired range. Nevertheless, multi-port DC-DC converters have encountered challenges like bulky transformers and multiple switches, resulting in reduced reliability. To address these issues, this study presents super lift Luo and buck converter (SLBC) designed for the integration of PV and EV. The DC-DC converter presented in the work, integrated with SLBC, produces both step-up and step-down outputs from single input. The step-up output is achieved through the application of the super-lift method, enabling the elevation of voltage. This method allows for the generation of high-gain voltages using straightforward structures, eliminating the need for additional transformers or electric circuits for control and regulation. For fine tuning the duty cycle of the proposed converter, an efficient control scheme employing a cascaded structure of the TID (tilt integral derivative) with FOPID (fractional order proportional integral derivative with a filter), referred as the cascaded TID-FOPID controller is proposed. The tuning of the cascaded TID-FOPID controller parameters is accomplished using improved Harris Hawks optimization (IHHO). The analysis is carried out in the MATLAB platform and compared to various existing approaches. Analysed parameters include motor torque and speed, converter efficiency across duty cycles (0.1 to 0.6), frequency response, voltage gain comparative analysis among converters at a duty cycle of 0.6, voltage gain, voltage stress, and diode stress comparisons in the proposed converter. The efficiency attained by the proposed method reaches approximately 98%.