چكيده به لاتين
Safety and reliability are two keys of maintaining the stability of a power system. The safety and reliability of the power system highly depends on the reliability of the protection system. Hidden failure of protection is one of the major causes of cascading failure and outages of power systems. When a fault occurs on a section or a component in a given power system, if one or more protection relays (PRs) do not work properly, or in the other words, a malfunction or malfunctions happen with these PRs, the outage area will be extended. Hidden failures are defects that go undetected under normal operating conditions but manifest themselves during faults or transients, which may lead to the false operation of relaying schemes. Therefore, detection of these hidden failure in the power system play an important role in maintaining the امنيت and reliability of power system. Although many hidden failures can be detected during proper protection and maintenance procedure, today models are presented as analytic model to identify these failures without requiring maintenance routines.
In this study, a new analytic-based model is presented. In the proposed method named as "Direct identification method", the hidden failure have been determined without applying optimization method and complicated algorithms. In this method by a new analytic model and considering the information of the outputs of relay starters, rely trips, and reset as inputs and comparing between them and the expected outputs, the hidden failure of protection relays will be revealed.
Simultaneous detection of multiple hidden failure, less computation burden, giving the results with the highest accuracy are the important capabilities of the proposed method in this research. This method has been simulated with the supposed data on 14-bus IEEE and 118-bus IEEE system and results have shown the highest accuracy.
