Grid-Connected PV-Wind-Battery-Based Multi-Input Transformer-Coupled Bidirectional DC-DC Converter for Household Applications
Abstract-In this paper, a control strategy for power ﬂow management of a grid-connected hybrid photovoltaic (PV)–wind battery-based system with an efﬁcient multi-input transformer coupled bidirectional dc–dc converter is presented. The proposed system aims to satisfy the load demand, manage the power ﬂow from different sources, inject the surplus power into the grid, and charge the battery from the grid as and when required. A transformer-coupled boost half-bridge converter is used to harness power from wind, while a bidirectional buck–boost converter is used to harness power from PV along with battery charging/discharging control. A single-phase full-bridge bidirectional converter is used for feeding ac loads and interaction with the grid. The proposed converter architecture has reduced number of power conversion stages with less component count and reduced losses compared with existing grid-connected hybrid systems. This improves the efﬁciency and the reliability of the system. Simulation results obtained using MATLAB/Simulink show the performance of the proposed control strategy for power ﬂow management under various modes of operation. The effectiveness of the topology and the efﬁcacy of the proposed control strategy are validated through detailed experimental studies to demonstrate the capability of the system operation in different modes.
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