Survey of Harmonic Levels on the American Electric Power Distribution System

Shuter,; Volikommer,; Kirkpatrick,

doi:10.1109/mper.1989.4310335

Cited by 20 publications

(3 citation statements)

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“…The overall magnitude of harmonic currents in a distribution network typically follows the trend of fundamental current (i.e., power demand), as harmonic (nonlinear) and linear loads tend to be simultaneously present in the network, particularly commercial loads, which operate over distinct periods of time. In most cases, in the short term, an upward trend in power demand is likely to be followed by a similar upward trend in magnitude of harmonic currents [108][109][110][111]. In addition, harmonic distortion in distribution networks is influenced by load composition.…”

Section: Voltage Sags and Harmonicsmentioning

confidence: 99%

“…In addition, harmonic distortion in distribution networks is influenced by load composition. For example, a distribution feeder that supplies 100% industrial load is likely to have different harmonic distortion levels from a feeder that supplies 40% commercial and 60% residential load [108]. The difference arises due to the characteristics of harmonic loads in each case which, besides different THD level, also produce different characteristic harmonics.…”

Section: Voltage Sags and Harmonicsmentioning

confidence: 99%

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Principles of Electrical Power Control

Hanzelka¹,

Milanović

Power Systems

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Section: Voltage Sags and Harmonicsmentioning

confidence: 99%

Section: Voltage Sags and Harmonicsmentioning

confidence: 99%

Principles of Electrical Power Control

Hanzelka¹,

Milanović

Power Systems

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“…Harmonic currents on the power system can lead to several adverse effects including equipment overheating, malfunction of solid-state equipment, and interference with communication systems [1][2][3][4][5][6]. Typical loads connected to a low-voltage, threephase, four-wire power distribution system include office equipment such as computers, fax machines, photocopiers, fluorescent lighting circuits with magnetic and electric ballasts, adjustable-speed heating and air-conditioning system as well as many other sensitive electronic loads.…”

Section: Introductionmentioning

confidence: 99%

Active zero-sequence cancellation technique in unbalanced commercial building power system

Kim¹

Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04.

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In this paper, active zero-sequence cancellation technique is proposed for unbalanced commercial building power system. A grounding zig-zag transformer is used to flow the equal harmonic currents through all transformer windings and to allow a fundamental current into utility neutral line. Lower voltage and high current rated single-phase inverter regulates only a single phase current. Then, other phase currents are equally distributed due to the zig-zag combination of the transformer. The fundamental neutral current flow in utility side is achieved by circulating harmonics into the zig-zag transformer. And the proposed control technique based on mathematical analysis is developed for unbalanced nonlinear loads normally shown in commercial office buildings. The technique requires sensing only a neutral load current and a single transformer winding current. The algorithm is implemented by a digital signal processor (DSP) without any line voltage sense. Experimental results are presented to verify the analysis and to show that the proposed technique is capable to be used for zero sequence cancellation under unbalanced as well as balanced system.

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