Power Quality Affected by DC and AC LED Bulb Loading of a PV Generator Connected to a Microgrid

Samol Chreang, P. Kumhom
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引用次数: 0

Abstract

Ahstract-Light-Emitting Diode (LED) bulbs or lamps are popularly used nowadays because of their less power consumption and long lifespan. However, usages of LED bulbs including the DC and AC types affect power quality of the power system because the needs of DC-to-DC converters and/or inverters. This paper presents a comparison of power quality affected by the DC and AC LED bulb loads supplied by a PV generator (PVG) connected to a PV microgrid. Various loading conditions based on centralized and decentralized drivers are carried out. Also the effect switching frequency for DC-to-DC converter used inside LED drivers is explored. The power quality is measured by means of total distortion percentage in the power line currents on both DC and AC side. The study is based on simulations using the existing simulation models of a PV generator, a converter, an inverter, DC LED bulb, and AC LED bulbs. The results show that DC LED lamp loading has higher effects to the total distortion than AC LED has. Moreover, using the centralized driver has a small advantage over the decentralized case while the distortion increases when the switching frequency is reduced. Although the resulting distortions from the simulations may not be accurate, the comparison results may be used as a guideline for designing a PV microzrid.
接入微电网的光伏发电机直流和交流LED灯泡负荷对电能质量的影响
摘要:发光二极管(LED)灯泡因其功耗低、寿命长而被广泛使用。然而,包括直流和交流类型在内的LED灯泡的使用会影响电力系统的电能质量,因为需要DC- DC转换器和/或逆变器。本文比较了光伏发电机(PVG)提供的直流和交流LED灯泡负载对光伏微电网电能质量的影响。基于集中式和分散式驱动进行了不同的加载条件。探讨了LED驱动器内部dc - dc转换器的开关频率对开关频率的影响。电能质量是通过直流和交流两端电源线电流的总失真百分比来测量的。本研究基于现有的PV发电机、转换器、逆变器、直流LED灯泡和交流LED灯泡的仿真模型进行仿真。结果表明,与交流LED相比,直流LED灯负载对总畸变的影响更大。此外,使用集中式驱动器比分散式驱动器具有较小的优势,但当开关频率降低时,失真会增加。虽然模拟结果可能不准确,但比较结果可以作为光伏微电网设计的指导。
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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