Model-based analysis of protection system performance

Abstract

Following a power system fault, protection engineers have to analyse the protection scheme activity to ensure correct operation. To aid them in this task, data gathering systems are increasingly being fitted to power systems. However, during extreme operating conditions, the volume of data made available by these systems can be overwhelming. To help overcome this, knowledge-based systems have been developed and installed at ScottishPower's corporate headquarters to extract the relevant `information' from the supervisory control and data acquisition (SCADA) system `data'. The paper reports on the next stage of decision support for the protection engineers which builds upon the diagnosis provided by the knowledge-based systems. This enhanced support is provided by a model-based diagnostic system which provides automatic analysis of the available fault recorder data. This system utilises the most appropriate techniques employed by existing model-based diagnostic systems. A novel approach for handling tolerances associated with the operating times of protection scheme components is introduced, thus enabling modelling measurement inaccuracies to be dealt wit

DG and protection systems in distribution network: Failure monitoring system based on petri nets

“…In fact, multiplying by -1 the fourth column in mod (11), the same value of syndrome is reached. Vice versa transition faults aren't present because the error syndrome is equal to 0.…”

“…In [9][10] other two examples of MAS technology was shown, highlighting the flexibility and the extensibility it offers. Knowledgebased systems to extract the relevant information from SCADA system data had been presented in [11]. Regarding the second topic, in [12] an integrate scheme to study power system vulnerability in presence of protection failures was considered and a reliability system based on stochastic properties was tested.…”

A toolset for applying model-based reasoning techniques to diagnostics for power systems protection

“…Using MBR techniques this process can be automated to validate the performance of entire protection schemes as well as just the relays [7], [8], such as the protection for the feeder shown in Fig. 2.…”

“…Nevertheless, a number of prototype systems have been developed which perform temporal MBD. A review of these systems can be found in [8] and [13]. In general, these systems have an underlying dependency on the type of models they employ, tying the developer to using a particular modeling formalism which is often related to the way time is represented.…”

On-Line Fault Diagnosis with Incomplete Information in a Power Transmission Network

“…In the PEDA system fault diagnosis is performed by a sequential application of a Knowledge-Based System (KBS), which inclusion as an agent is described in [7], followed by a Model-Based System (MBS) described in [8]. The KBS and MBS were developed to perform independent tasks.…”