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A Bidirectional Grid-Connected DC–AC Converter for Autonomous and Intelligent Electricity Storage in the Residential Sector

Abstract : Controlling the cost of electricity consumption remains a major concern, particularly in the resi-dential sector. Smart home electricity management systems (HEMS) are becoming increasingly popular for providing uninterrupted power and improved power quality, as well as for reducing the cost of electricity consumption. When power transfer is required between a storage system and the AC grid, and vice versa, such a HEMS requires the use of a bidirectional DC-AC converter. This paper emphasizes the potential value of an almost unexplored topology whose design is based on the generation of sinusoidal signals from sinusoidal half waves. A DC-DC stage, which behaves as a configurable voltage source, is in series with a DC-AC stage, i.e., an H-bridge, to achieve an architecture that can operate in both grid and off-grid configurations. Wide bandgap power switches (silicon carbide MOSFETs), combined with appropriate control strategies, are the keys to increasing compactness of the converter while ensuring good performance, especially in terms of efficiency. The converter is configured to automatically change the operating mode i.e., inverter or rectifier in power factor correction mode, according to an instruction issued by the HEMS; the latter being integrated in the control circuit with automatic duty cycle management. Therefore, the HEMS sets the amount of energy, to be injected into the grid or stored. The ex-perimental results validate the operating modes of the proposed converter and demonstrate the relevance of such a topology when combined with a HEMS, especially in the case of an AC grid connection. Efficiency measurements of the bidirectional DC-AC converter, performed in grid-connected inverter mode, show that we exceed the efficiency target of 95% over the entire output power range studied, i.e., from 100 W to 1.5 kW.
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https://hal-univ-tours.archives-ouvertes.fr/hal-03566417
Contributor : Sebastien Jacques Connect in order to contact the contributor
Submitted on : Friday, February 11, 2022 - 3:06:20 PM
Last modification on : Thursday, February 24, 2022 - 3:35:47 AM
Long-term archiving on: : Thursday, May 12, 2022 - 6:48:14 PM

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Ismail Aouichak, Sebastien Jacques, Sébastien Bissey, Cedric Reymond, Téo Besson, et al.. A Bidirectional Grid-Connected DC–AC Converter for Autonomous and Intelligent Electricity Storage in the Residential Sector. Energies, MDPI, 2022, 15, ⟨10.3390/en15031194⟩. ⟨hal-03566417⟩

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