The Coupling of Voltage and Frequecncy Response in Splitting Island and Its Effects on Load-shedding Relays

DOI: 10.4236/epe.2013.54B128   PDF   HTML     4,433 Downloads   5,230 Views   Citations


The voltage and frequency dynamics interact with each other in the island after splitting. The current frequency response model without considering the voltage effect would bring remarkable errors when analyzing the frequency dynamic progress in the island with large-capacity active-power shortage. In this paper, coupling effects of voltage and frequency are studied to indicate that initial reactive-power deficit and load characteristics have strong effects on the coupling effects of the voltage and frequency. Moreover, control effects of currently used under frequency load-shedding relays (UFLS) and under voltage load-shedding relays (UVLS) which are installed and executed independently are examined to find that it would sometimes cause excessive or inadequate control without considering the coupling, suggesting that it is necessary to develop coordinate control methods for voltage and frequency problems.

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H. Yang and B. Zhang, "The Coupling of Voltage and Frequecncy Response in Splitting Island and Its Effects on Load-shedding Relays," Energy and Power Engineering, Vol. 5 No. 4B, 2013, pp. 661-666. doi: 10.4236/epe.2013.54B128.

Conflicts of Interest

The authors declare no conflicts of interest.


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