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Erschienen in:
2011 | OriginalPaper | Buchkapitel
9. Characteristics of Measurement of Criterion Values and Adaptive Algorithms
verfasst von : Waldemar Rebizant, Janusz Szafran, Andrzej Wiszniewski
Erschienen in: Digital Signal Processing in Power System Protection and Control
Verlag: Springer London
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Abstract
Standard control systems are designed and evaluated taking into account dynamics and required accuracy for various input signals. Digital protection systems should also be evaluated in a similar way, however, the fundamental parameter is time needed to take decision concerning the state of protected element of the power system. Sometimes it is as short as a fraction of period of the fundamental frequency component. This decision time, different for various power system elements, is usually fixed to avoid possible extended damage of protected plants. For some criterion values and some decision-making methods the final decision is to be done even during transient states of measurement when one can still expect substantial errors criteria values determination. This is why while designing a protection system one must take dynamic features of measurement algorithms into consideration and perform optimization of its elements and the entire system as a decision-making device.