An Innovative Bidirectional DC-AC Converter to Improve Power Quality in a Grid-Connected Microgrid

Bissey, Sébastien; Jacques, Sébastien; Reymond, Cedric; Bunetel, Jean-Charles Le

doi:10.20944/preprints201807.0252.v1

Cited by 3 publications

(3 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared to the first converter presented in [26] (this converter was experimentally tested in islanding mode), we intentionally decreased the switching frequency of the MOSFETs in the DC-DC stage from 300 kHz to 150 kHz. At 300 kHz, the converter efficiency lost, on average, 0.3 efficiency points over the output power range studied here.…”

Section: Efficiency Of the Whole Convertermentioning

confidence: 99%

“…Alternating loads can be powered either directly from the AC grid or through an inverter in case the storage system would relieve the AC grid. To implement these two modes of operation, a necessarily bidirectional DC-AC converter must be operational [26]. Its metrics in terms of compactness, efficiency and output signal quality must be as high as possible.…”

mentioning

confidence: 99%

“…As shown in Figure 8, the main components to be sized were the power MOSFETs of both stages [36][37][38], the inductor of the DC-DC stage [39,40] and the output voltage modulation of the DC-DC stage [26].…”

mentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2022

Self Cite

View full text Add to dashboard Cite

Controlling the cost of electricity consumption remains a major concern, particularly in the residential 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, these HEMS require the use of a bidirectional DC–AC converter. This paper emphasizes the potential value of an almost unexplored topology, the design of which was based on the generation of sinusoidal signals from sinusoidal half waves. A DC–DC stage, which behaved as a configurable voltage source, was in series with a DC–AC stage, i.e., an H-bridge, to achieve an architecture that could operate in both grid and off-grid configurations. Wide bandgap power switches (silicon carbide metal-oxide-semiconductor field-effect transistors [MOSFETs]), combined with appropriate control strategies, were the keys to increasing compactness of the converter while ensuring good performance, especially in terms of efficiency. The converter was 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 set the amount of energy to be injected into the grid or to be stored. The experimental results validate the operating modes of the proposed converter and demonstrate the relevance of such a topology when combined with an HEMS, especially in the case of an AC grid connection. The efficiency measurements of the bidirectional DC–AC converter, performed in grid-connected inverter mode, show that we exceeded the efficiency target of 95% over the entire output power range studied, i.e., from 100 W to 1.5 kW.

show abstract

Section: Efficiency Of the Whole Convertermentioning

confidence: 99%

mentioning

confidence: 99%