Automation In Electrical Power Systems by A. B Barzam

By A. B Barzam

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Indb 11 3/13/15 11:19 AM 12 Harmonics, Power Systems, and Smart Grids, Second Edition 125 60 Hz current 5th harm. current 7th harm. current 11th harm. current 13th harm. 10 Decomposition of a distorted waveform. A main source of interharmonics is the AC-to-AC converter, also called cycloconverter. These devices operate with a fixed amplitude and frequency at the input; at the output, amplitude and frequency can be variable. A typical application of a cycloconverter is as an AC traction motor speed control and other high-power, low-frequency applications, generally in the MW range.

9(b).

Continued) AC at variable frequencies for processes involving speed control of induction motors. Most bulk energy conversion processes take place in the oil, mining, steel mill, pulp and paper, textile, and automobile industries. Other applications include manufacturing assembly lines and electrolytic coating processes, which can produce significant amounts of harmonic current generation. Arc devices (namely, electric furnaces, soldering equipment, fluorescent, and mercury vapor or high-pressure sodium lamps) can become very special sources of harmonics in that they can involve frequencies below the fundamental power frequency and fractional harmonics.

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