Comparative analysis of modulation schemes for multilevel half-bridge bidirectional DC–DC converter in microgrid applications

S SOFIYA, K M MUHAMMED SHAFY, SHELAS SATHYAN
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Abstract

This paper analyses the performance of multilevel half-bridge bidirectional DC–DC converter (MHBDC) under wide change in voltage transformation ratio. The advantage of MHBDC topology over conventional isolated bi-directional dc–dc converter (CIBDC) includes reduced voltage stress across the semiconductor switches and the transformer windings, which is suitable for high voltage applications in DC microgrids. Microgrids is inclined to voltage variations at both input and output side, which direct towards increased current stress in MHBDC. The rise in current stress can be minimized by employing various phase shift modulation techniques. The paper presents steady state time domain analysis of MHBDC under conventional phase shift modulation (CPSM), extended phase shift modulation (EPSM) and dual phase shift modulation (DPSM). A computational procedure is developed and demonstrated to obtain the phase shift angles at minimum value of current stress and varying voltage transformation ratio in the converter. Current stress analysis, soft switching region of operation and reverse power flow analysis in MHBDC are examined under different modulation schemes. A 1.5 kW hardware prototype of MHBDC is built, evaluated and presented the results. Power loss analysis and efficiency plots for the converter is determined and quantitatively evaluated with different modulation techniques considering high, medium and low power ranges.

Abstract Image

微电网应用中多级半桥双向 DC-DC 转换器调制方案的比较分析
本文分析了多电平半桥双向直流-直流转换器(MHBDC)在电压变换比变化较大的情况下的性能。与传统的隔离式双向直流-直流转换器(CIBDC)相比,多电平半桥双向直流-直流转换器拓扑结构的优势在于降低了半导体开关和变压器绕组上的电压应力,适用于直流微电网中的高压应用。微电网的输入端和输出端都有电压变化,这导致 MHBDC 中的电流应力增加。采用各种移相调制技术可将电流应力的增加降至最低。本文介绍了在传统移相调制(CPSM)、扩展移相调制(EPSM)和双移相调制(DPSM)下 MHBDC 的稳态时域分析。开发并演示了一个计算程序,以获得转换器中电流应力最小值和电压变换比变化时的相移角。研究了不同调制方案下 MHBDC 的电流应力分析、软开关工作区域和反向功率流分析。建立了一个 1.5 千瓦的 MHBDC 硬件原型,并对其进行了评估和结果展示。考虑到高、中、低功率范围,利用不同的调制技术确定并定量评估了转换器的功率损耗分析和效率图。
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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