LED lighting is becoming the wave of illumination technology due to their high efficiency and low power usage. One consequence of LEDs is their behavior as non-linear loads and their injection of harmonics into the network. Harmonics within a system can increase the load seen by the supply and cause overheating or failure by the equipment. Utility companies attempt to minimize loads seen during times of peak demand by implementing Conversation Voltage Regulation techniques such as voltage regulators, switchable capacitor banks, and generator excitation controls. In the US, the utility is allowed to vary the line-voltage ± 5% the nominal (120V).
This study explored the change in power quality and optical characteristics of LED lamps at voltages between 111V and 129V. LED fixtures ranging from street lights, troffer, tube style, and screw-in bulbs were all characterized under test conditions. Additional fixtures with dimming capabilities were tested at several dimming settings for each of the test voltages. The LEDs tested showed electrical and optical stability over the test voltages and had minimal change in power quality. Commercial fixtures had between 1–3% variations in power factor between the voltage maxima. Screw-in bulbs showed the greatest dependence on line voltage and showed a decreasing Power Factor as voltage increased. Dimming showed degrading electrical characteristics and increased harmonic distortion levels for lower brightness.
|Advisor:||Westgate, Charles R.|
|Commitee:||Zhou, Ning, Das, Pritam|
|School:||State University of New York at Binghamton|
|Department:||Electrical and Computer Engineering|
|School Location:||United States -- New York|
|Source:||MAI 81/2(E), Masters Abstracts International|
|Subjects:||Electrical engineering, Engineering|
|Keywords:||CRI, CVR, Dimming, LED, Light emitting diode, Power quality|
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