A Comparative Study on Power Quality Standards and Interaction Analysis for LVDC Systems

2022 IEEE Industry Applications Society Annual Meeting (IAS) Pub Date : 2022-10-09 DOI:10.1109/IAS54023.2022.9939714

Yahui Li, Kaiqi Sun, Yuanyuan Sun, Keli Li, J. Lou, Yanqing Pang

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Abstract

The high penetration of distributed renewable energy resources (DERs) and various fast increasing direct current (DC) loads significantly facilitate the development of low voltage DC (LVDC) systems. Novel power electronic devices further provide opportunities for the flexible interconnection of alternating current (AC) and DC networks. However, there is still a lack of international standards concerning DC power quality. In addition, it is not clear whether the relevant power quality research applies to the LVDC systems. In this paper, a definition of the DC power quality issues is given based on the existing IEC and IEEE standards and codes and the detailed reasons for the typical DC power quality events. Then, the correlation between DC power quality phenomena, which plays an essential role in the formulation of DC power quality standards, is illustrated and quantified. Moreover, the influence on DC ripple, DC unbalance and oscillation with AC/DC interconnection is analyzed. The resulting comparative study in this paper provides a reference for formulating the definitions and constraints of LVDC power quality issues, which could strongly support the future DC power quality standard enaction.

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LVDC系统电能质量标准与交互分析的比较研究

分布式可再生能源(DERs)的高渗透率和各种快速增长的直流(DC)负载极大地促进了低压直流(LVDC)系统的发展。新型电力电子设备进一步为交流(AC)和直流网络的灵活互连提供了机会。但是，目前在直流电源质量方面还缺乏国际标准。此外，相关的电能质量研究是否适用于LVDC系统尚不清楚。本文以现有的IEC和IEEE标准和规范为基础，对直流电能质量问题进行了定义，并详细分析了典型直流电能质量事件产生的原因。然后，对直流电能质量现象之间的相关性进行了说明和量化，这对制定直流电能质量标准起着至关重要的作用。分析了交直流互连对直流纹波、直流不平衡和振荡的影响。本文的对比研究结果为制定LVDC电能质量问题的定义和约束条件提供了参考，可以有力地支持未来直流电能质量标准的制定。

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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2022 IEEE Industry Applications Society Annual Meeting (IAS)

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