Battery energy storage effect on AC/DC microgrids efficiency

2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe) Pub Date : 2016-10-25 DOI:10.1109/EPE.2016.7695659

Elahe Doroudchi, J. Kyyra, M. Lehtonen

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引用次数: 2

Abstract

This paper compares the efficiency of AC and DC microgrids from a new perspective. It studies the effect of adding a battery energy storage on a microgrid efficiency. A new designed Finnish-townhouse building is applied to model the power flow and converter types. Losses related to wirings, converters and discharging of the energy storage are calculated in a minute resolution to enhance the accuracy of the results. Ultimately, efficiency is derived for a range of converters' switching frequencies from 4 to 15 kHz while considering the microgrid possible voltage fluctuations in both AC and DC systems. Results represent higher efficiency in the DC microgrid in both cases with and without the existence of the storage. Furthermore, less discrepancy is obtained in the DC microgrid efficiency when the storage is added comparing to the AC microgrid. Accordingly, switching to DC distribution inside the building concerning the fast developments in power conversion devices seems promising in increasing the efficiency of the power systems.

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电池储能对交直流微电网效率的影响

本文从一个新的角度比较了交流微电网和直流微电网的效率。研究了增加电池储能对微电网效率的影响。采用新设计的芬兰联排别墅建筑来模拟潮流和转换器类型。与布线、变流器和储能放电有关的损耗以一分钟的分辨率计算，以提高结果的准确性。最后，在考虑微电网交流和直流系统中可能的电压波动的情况下，推导出转换器的开关频率范围从4到15 kHz的效率。结果表明，在有和没有储能的情况下，直流微电网的效率都更高。此外，与交流微网相比，增加储能后直流微网效率差异较小。因此，考虑到电力转换设备的快速发展，在建筑物内转换为直流配电似乎有希望提高电力系统的效率。

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2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)

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