The Simple Power-Based Modulation Methods for DAB-Based AC-DC Converter with Unfolder Concept

2020 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2020-03-01 DOI:10.1109/APEC39645.2020.9124084

Nie Hou, Y. Li, L. Ding

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引用次数: 2

Abstract

The DAB-based AC-DC converter with isolated ability has been studied to connect the ac grid and the dc bus with unfolder operation for high efficiency performance, and the DAB dc-dc stage is employed to realize the half sinusoidal modulation. However, in terms of efficiency, the adopted modulation methods in the existing methods may be not very suitable for the DAB converter, and a minimum-current-stress phase-shift (MCS-PS) method is selected which can implement on-line continuous control with high efficiency for this converter. Generally, there are two kinds of load conditions for this AC-DC converter, including the resistor load and the grid voltage source. When the DAB-based AC-DC converter is connected with the load resistor, the accurate power flowing model is analyzed, and then, a simple power-based modulation scheme (SPBM) is proposed for high power quality. Moreover, when this AC-DC converter is connected with the grid voltage source, a SPBM scheme is also proposed for high power quality and regulating both the active power and the reactive power. Finally, the simulation and experimental results are provided to verify the excellent performance of the proposed SPBM strategies.

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基于非文件夹概念的dab型交直流变换器的简单功率调制方法

研究了基于DAB的具有隔离能力的交流-直流变换器，将交流电网与直流母线连接在一起，实现了高效率，并采用DAB的dc-dc级实现了半正弦调制。然而，在效率方面，现有方法中采用的调制方法可能不太适合DAB变换器，因此选择了最小电流应力相移(MCS-PS)方法，该方法可以高效地实现该变换器的在线连续控制。一般情况下，这种交直流变换器有两种负载条件，包括电阻负载和电网电压源。当基于dab的交直流变换器与负载电阻连接时，分析了准确的功率流动模型，并提出了一种简单的基于功率的调制方案(SPBM)。此外，当该交直流变换器与电网电压源连接时，还提出了一种SPBM方案，以提高电能质量，同时调节有功功率和无功功率。最后，仿真和实验结果验证了所提SPBM策略的优良性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2020 IEEE Applied Power Electronics Conference and Exposition (APEC)

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