Research on Topology and Control Strategy of Single-stage Isolated Photovoltaic Micro Inverter Based on Triple-Active-Bridge Converter
Abstract
As a core power conversion unit in distributed grid-connected photovoltaic (PV) systems, micro inverters have garnered significant attention in the industry. Traditional two-stage microinverters suffer from multiple conversion stages and high energy losses, while single-stage micro inverters exhibit complex control strategies. Moreover, both topologies require additional ports to achieve power decoupling between the AC and DC sides. Drawing inspiration from the port anti-series configuration of three-port DC converters, this study proposes a single-stage PV micro inverter based on a triple active bridge (TAB) converter. The proposed topology features low energy loss, simplified control, and inherent suppression of double-line-frequency power ripple without the need for extra decoupling ports.