Journal
IEEE TRANSACTIONS ON POWER SYSTEMS
Volume 21, Issue 3, Pages 1260-1266Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRS.2006.879315
Keywords
adaptive control; dynamic simulation; nonlinear estimation; underfrequency load shedding (UFLS)
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Funding
- EPSRC [EP/E009735/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E009735/1] Funding Source: researchfish
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In this paper, a new approach to adaptive underfrequency load shedding (UFLS), a procedure for protecting electric power systems from dynamic instability and frequency collapse, is presented. It consists of two main stages. In the first stage, the frequency and the rate of frequency change are estimated by the nonrecursive Newton-type algorithm. By using the simplest expression of the generator swing equation, in the second algorithm stage, the magnitude of the disturbance is determined. The UFLS plan is adapted to the magnitude estimated, obtaining in this way a more efficient system operation during emergency conditions. Results of procedure testing are demonstrated through the dynamic simulations by using: 1) a simple three-machine test system and 2) a ten-machine New England system.
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