Voltage balancing using switched capacitors

Thyristor switched capacitors (TSCs) are a useful means of load balancing and reactive power support. The control of a general load by a binary weighted switched capacitor system is discussed in this paper along with a simple control scheme where the capacitor bank across a line pair is adjusted to...

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Bibliographic Details
Published in:Electric power systems research 1992-08, Vol.24 (2), p.85-90
Main Authors: Ledwich, G.F., Hosseini, S.H., Shannon, G.F.
Format: Article
Language:English
Subjects:
Applied sciences
Disturbances. Regulation. Protection
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Power networks and lines
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Summary:Thyristor switched capacitors (TSCs) are a useful means of load balancing and reactive power support. The control of a general load by a binary weighted switched capacitor system is discussed in this paper along with a simple control scheme where the capacitor bank across a line pair is adjusted to control the fundamental voltage magnitude for that line pair. In a three-phase three-wire system, it is shown that an ideal reactive source can control positive sequence magnitude and cancel any negative phase sequence terms. With the quantized control levels available in a TSC, a ramping scheme with input hysteresis is shown to be effective in balancing in simulations and in a laboratory test with three banks in each phase. Low transient switching is employed with binary weighted capacitor banks to give a smooth variation of the reactive power supplied.
ISSN:0378-7796
1873-2046
DOI:10.1016/0378-7796(92)90074-B