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To deal with a lot of uncertain information existing in the grid when faulted, this article uses a special Bayesian network—Noisy-or, Noisy-and nodes model to build object-oriented Bayesian networks. An error back propagation algorithm is used to train the Bayesian network so as to update the network's parameters. Finally a case simulation is presented to prove the accuracy and validity of this method...
The intelligent substation has the characteristics of the intelligent primary devices and the networking secondary system, which has greatly improved its controllability and observability. The change of the secondary system of the intelligent substation makes the traditional fault diagnosis algorithm difficult to adapt it because the traditional fault diagnosis algorithm doesn't take the influence...
Substations play an important role in power systems. The application of the IEC61850 standard changes the situation of the traditional substation greatly. The information in the intelligent substation is rich, but it is difficult for the operators to digest them in a short time without an effective assistant tool. A fault diagnosis method which uses the alarming information of the primary and secondary...
This paper presents a new method of the distribution network fault diagnose based on data mining. This method uses the fault information produced in the process of distribution network fault handling to study the spatial and temporal characteristics of distribution network fault. It uses APRIORI algorithm to establish database of fault attributes and mine the association rules of fault information...
This paper proposed a new power grid fault diagnosis model combining Petri nets and grid computing. It includes the power grid computing system's structure, software service and algorithm. The model can use the high performance computing method and distributed environment of grid computing. At the same time, Data grid system can offer table, efficient and unified information resources for the power...
In substations of power system, 3/2 Breaker Scheme are used commonly. Its protective relay configuration is complex, There is a lot of information when the fault occurs, especially when the protective relays and circuit breakers fail to work, how to determine the fault element is particularly intricate. In view of features of 3/2 Breaker Scheme Fault Diagnosis, this paper put forwards a new fault...
In this paper, an approach of power system fault diagnosis based on the protection coordination and Petri net theory is presented. The construction of diagnosis model and the method of identifying the faulted equipments are described in detail. The relation grade between faulted equipments and their protections are described also. Test result shows that the method can reduce processing time and is...
A weak structure power grid is usually characteristic of weak structure, light load and long transmission distance. The grid of Republic of Congo is taken as an example to analyze special problems existed in the operation of such grids. Over-voltage in operation and the impact of generator integration on weak structure power system are focused. After a detailed discussion, a solving scheme was proposed...
Power system real-time digital simulation system, which is widely used in China, plays an important role in stability analysis, security assessment, relay protection equipments test, etc. With electronic transformers, D/A conversion and power amplification are no longer needed, output data by simulation software can be directly sampled. The schematic diagram of the new digital simulation system with...
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