ABSTRACT
This paper proposes a solar-powered charging system that integrates a Resonant (Inductor-CapacitorCapacitor) Converter with a PI controller for efficient energy harvesting. The key innovation lies in utilizing the output duty cycle to control power flow effectively by generating two distinct duty cycles within an H-bridge configuration of IGBTs. The resonant converter facilitates wider operating voltage range through efficient DCDC conversion. This combined approach results in a high performance, versatile charging system suitable for diverse applications. Simulation work of the proposed topology will be carried out in MATLAB/Simulink.
INTRODUCTION
Solar-powered charging systems can offer a sustainable and eco-friendly method of charging portable and mobile devices. A solar panel is used to convert solar energy into electrical energy. The energy is then sent to the resonant converter, which converts it into a high-frequency resonant signal, after MPPT has been employed to obtain the maximum power. The resonant signal and resonant coil are connected on the secondary side of the system. The resonant tank circuit's intrinsic frequency and the resonant converter's operational frequency are meant to match. To further improve system efficiency, reactive power in the resonant tank circuit is also meant to be maintained to a minimum. The system can charge a variety of portable and mobile devices, including tablets, smartphones, and laptops. The most often used dc–dc converters for battery chargers is LCC resonant converter. The global surge in electricity demand, coupled with heightened environmental awareness and the ongoing depletion of conventional energy sources, has intensified the quest for sustainable and eco-friendly alternatives. Solar energy, owing to its abundance, renewability, and minimal environmental impact, emerges as a promising solution. Harnessing solar power through Photovoltaic (PV) systems, however, presents challenges associated with dynamic insolation conditions that significantly impact efficiency and output power. To enhance the performance of PV modules, extensive research has been conducted, resulting in diverse Maximum Power Point Tracking (MPPT) algorithms and Direct-Current to Direct-Current (DC-DC) converter architectures. MPPT techniques play a pivotal role in extracting the maximum power from solar PV modules and ensuring optimal energy transfer to the load. Pulse-width modulation (PWM) control methods are commonly used in traditional DC-DC charging systems, yet they can result in large switching losses. Among the various DC-DC converters, the choice of converter type profoundly influences the overall effectiveness of the solar energy system. This research focuses on the design and implementation of an innovative solar-powered charging system utilizing a Resonant LCC Boost Converter. The Resonant LCC Boost Converter is selected for its ability to address key challenges associated with PV systems, offering a robust solution that enhances energy extraction and ensures efficient power transfer to the load. Resonant converters, such as the LCC topology, have demonstrated advantages in terms of reduced circulating losses and improved voltage regulation. In alignment with previous studies the investigation delves into the critical role of DC-DC converters in MPPT applications, emphasizing the need for an optimal converter to maintain peak power output. Furthermore, the comparative study of different MPPT algorithm informs the selection of the most suitable algorithm for our solar-powered charging system. Building upon the insights from hardware implementation studies, this research aims to contribute to the evolving landscape of solar energy systems. The proposed Resonant LCC Boost Converter promises to enhance the efficiency and reliability of solar PV modules under varying insolation conditions. Through a combination of resonant converter technology and effective MPPT algorithms, our system seeks to address the challenges posed by the non-linear characteristics of PV modules, ensuring maximum power extraction and improved overall performance. For photovoltaic (PV) energy harvesting systems, a low quality factor (Q) design combined with a hybrid modulation technique can improve the performance of a three-phase resonant converter. In the subsequent sections, we will provide a detailed description of the Resonant LCC Boost Converter, elucidate the chosen MPPT algorithm, present simulation results, and conclude with implications for practical applications. A complete bridge LLC series resonant converter control design. the difficulties in creating a controller for these converters and suggests a novel architecture that lowers the control loop's complexity by utilizing the output diode current measurement. The system as it provides a high voltage gain, which low-voltage SPV sources require. Additionally, they point out that the PRI shows zero voltage switching to minimize switching losses and employs resonance to raise the voltage level. In addition, the system makes use of Maximum Power Point Tracking in the PRI, which is based on a sliding mode controller. The findings from this research are anticipated to advance the field of solar-powered charging systems, offering an effective and sustainable solution for harnessing solar energy.