Single-Stage Interleaved Photovoltaic (PV) Step-up Resonant Converter Modules with Integrated PV MPPT for Magnetron Application

Abstract

With the growing need for compact, efficient, high-voltage DC power supplies for magnetron applications and the global interest in renewable energy sources, the power electronics industry has new challenges and opportunities. Photovoltaic (PV) energy, as a clean energy source, is widely available and requires efficient power conversion interfaces to satisfy the magnetron load's high-voltage, low-ripple, and high-efficiency demands.

In this thesis, a high-gain single-stage DC/DC converter with soft-switching capability is proposed for PV-driven magnetron applications. This thesis is divided into two main sections. The first part addresses the topology development and analysis of the proposed converter. The topology combines an integrated interleaved boost stage, a CLL resonant network and a voltage doubler rectifier for high voltage gain and low input current ripple. The converter maintains zero-voltage switching (ZVS) for all the switches and zero-current switching (ZCS) for all the diodes over a wide range of operation conditions. In-depth theoretical analysis and design considerations followed by simulation and experimental verification with a hardware prototype, are presented in this section. The second part of the thesis offers maximum power point tracking (MPPT) control schemes tailored for PV integration. Two duty-ratio-based approaches are utilized: a discrete logic-based Perturb and Observe (P&O) algorithm and a closed-loop proportional-integral (PI) controller. A small-signal modeling of the boost-integrated stage is addressed to ensure dynamic stability and accurate tracking under variable irradiance conditions. The converter’s performance and the effectiveness of the control strategies are validated through both simulation and experimental testing.