A Modified Three-Phase Four-Switch Boost Rectifier With Two Inductors for Wind Energy Application Systems

While three-phase six-switch rectifiers are typically used in power conversion systems, this paper explores the potential of three-phase four-switch (TPFS) rectifiers for wind energy systems. Current advancements in TPFS rectifiers aim to enhance system efficiency and reduce the component count, addressing issues such as total harmonic distortion (THD) and electromagnetic interference (EMI). However, existing solutions often involve complex control strategies and an increased number of electronic components, which elevate costs and system complexity. This work introduces an approach to TPFS rectifiers for wind energy conversion by simplifying the traditional topology by eliminating one inductor, which can be represented as two-boost single-phase rectifiers for mathematical modeling. This modification significantly decreases common-mode (CM) currents and voltages, mitigating input current distortion and reducing EMI. We provide a comprehensive mathematical analysis demonstrating that this topological change allows for the decoupling of phases and simplifies mathematical modeling and control, treating the system as two independent single-phase half-bridge rectifiers. A 1 kW prototype validates the modified rectifier, with experimental results confirming feasibility and reliability. Results, which achieve a THD of 3.85% across each phase and a power factor of 0.993, meet IEC standards and confirm the efficacy of the approach for power factor correction.