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The paper focuses on small-signal analysis of aggregated operation of the low-voltage DC-grids comprising various power and load modules. Complex impedances, which can be identified experimentally, represent the internal structure of power converters and may become a reason for voltage instabilities while being gathered together in the DC-grid using cables. The paper proposes ideas to analyze and forecast possible resonance issues of parallel operation of power modules in the test model of the 380V DC-grid and make recommendations in order to avoid them
In this study, a three-phase bidirectional dc/ac converter is proposed using a direct ac/ac converter and a six-leg converter, to avoid the use of dc-link capacitors and to increase the current capability at the dc side. To link the six-leg inverter to the direct ac/ac converter, three single-phase high-frequency transformers are implemented to simplify the topology, which will attract the industry. The direct ac/ac converter used in the study demonstrates reduced complexity and simpler modulation techniques compared with a conventional matrix converter. The analysis starts with the description of the proposed dc/ac converter for single phase, which is subsequently extended to a three-phase dc/ac converter. A 20 kW prototype was built to verify and to validate the theoretical study of the proposed converter.
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