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An investigation into the OLTC effects on voltage collapse

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3 Author(s)
Zhu, T.X. ; Dept. of Electr. Eng., Ngee Ann Polytech., Singapore ; Tso, S.K. ; Lo, K.L.

It is known that following disturbances, on-load tap changers act to restore the load bus voltage and thus restore the load power to near pre-disturbance level. As the system is probably weakened by the contingencies, this will often over-tax existing supplies due to increased losses and reduction in power plant ability, and thus voltage collapse may result. This paper discusses the less emphasized effect of on-load tap changers from another point of view, i.e., how the maximum power transfer limit is affected by on-load tap changers. In addition to restoring the load, on-load tap changers also extend the power transfer ability. Whether the overall effect is beneficial or counter-productive depends on the system ability to balance the amount of extended power transfer limit and the amount of restored load by the same tap changers

Published in:

Power Systems, IEEE Transactions on  (Volume:15 ,  Issue: 2 )

Date of Publication:

May 2000

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