Bidirectional Buck and Boost DC–AC/AC–DC Converter Based on Dual-Mode Time-Sharing Technology

Existing single-phase single-stage buck and boost DC–AC inverters based on dual-mode time-sharing technology are highly competitive in low switching loss, low voltage stress on the power devices, negligible leakage current, buck and boost operation, zero dead time, and high reliability. However, existing dual-mode time-sharing inverters that integrate buck and boost converters cannot be applied in photovoltaic energy storage systems due to serious shortcomings in handling bidirectional energy flow and regulating the reactive power. This article proposes a buck and boost DC–AC inverter that addresses the above shortcomings by integrating a half-bridge topology and Boost converters. In addition, the switching states, operating modes, inductor-based mathematical modeling, device selection, indirect control strategy, and comparative study of the topology are analyzed in detail. Finally, reactive power regulation and bidirectional energy flow are validated on an experimental prototype with a rated power of 500 W and an AC grid of 110 V and 50 Hz.

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