Design, Analysis, And Implementation of a Wind-Powered Bridge-Less AC-DC Converter for DC Power Applications

Abstract

To address issues caused by frequent power supply interruptions, the Research Designs and Standards Organization (RDSO) is exploring an integrated power supply system based on alternative energy sources. The primary objective is establishing a stable and reliable DC power supply for railway signaling installations, which is critical for maintaining uninterrupted train operations. This paper introduces a new wind-powered bridgeless AC-DC converter designed to overcome the limitations of conventional AC-DC boost converters, such as complexity, cost, potential EMI issues, and concerns about component stress and reliability. Before adopting this converter topology, it is essential to assess these factors concerning specific application requirements and constraints thoroughly. The bridgeless boost converter operates through power factor correction (PFC) and DC-DC conversion stages. During PFC, AC input voltage is rectified to achieve a unity power factor, reduce harmonics, and improve compatibility with the utility grid. A Hunting Algorithm (HA) is preferred to extract maximum power. A battery backup ensures continuous operation during wind source unavailability to meet load demands. The system features a power rating of 1 kW, with an input voltage of 96V and an output voltage of -48V. Simulations conducted using MATLAB/Simulink encompass wind characteristics, MPPT tracking, bridgeless converter performance, operational modes, and analysis. Detailed loss calculations are performed to assess efficiency, resulting in an efficiency of 97.6% for the proposed converter with the controller. A prototype model with an input power rating of 1.2kW and output power of 1kW validates simulation results against hardware performance.