A 12 kW three-phase low THD rectifier with high-frequency isolation and regulated DC output
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Institute of Electrical and Electronics Engineers (IEEE)
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Resumo
A robust 12 kW rectifier with low THD in the line currents, based on an 18-pulse transformer arrangement with reduced kVA capacities followed by a high-frequency isolation stage is presented in this work. Three full-bridge (buck-based) converters are used to allow galvanic isolation and to balance the dc-link currents, without current sensing or current controller. The topology provides a regulated dc output with a very simple and well-known control strategy and natural three-phase power factor correction. The phase-shift PWM technique, with zero-voltage switching is used for the high-frequency dc-dc stage. Analytical results from Fourier analysis of winding currents and the vector diagram of winding voltages are presented. Experimental results from a 12 kW prototype are shown in the paper to verify the efficiency, robustness and simplicity of the command circuitry to the proposed concept.
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AC-DC converter, autotransformer, 18-pulse, harmonics, high-frequency conversion, power factor correction
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Inglês
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IEEE Transactions on Power Electronics. Piscataway: IEEE-Inst Electrical Electronics Engineers Inc., v. 19, n. 2, p. 371-377, 2004.
