Unknown Input Observer Based Robust Actuator Fault Detection and Isolation in Interconnected Power Systems

Year 2019, Volume: 7 Issue: 1, 6 - 14, 31.01.2019

V. M. İstemihan Genc Fikret Caliskan

https://doi.org/10.17694/bajece.470308

Abstract

In this paper, the performance degradation of a
generating unit in a multi-area power system regulated by an area-wise
decentralized load frequency control is detected and isolated via a scheme of
unknown input observers. This scheme is robust to the changes in the load
demand, which are considered as the unknown inputs. The actuator faults studied
in this work are meant to be the performance degradations in generating units
under load frequency control. Both stuck and non-stuck actuator faults are
analyzed and the performances of the proposed method in both cases are tested
through computer simulations on a two-area power system composed of five
generating units. The results show that a performance degradation in any
generating unit can be detected and isolated successfully provided that the
faults in the sensors measuring generator outputs are absent.

Keywords

fault diagnosis, load frequency control, fault detection and isolation, actuator fault, power generation control

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