Modeling and simulation of substation fault diagnosis based on Petri nets
In order to improve the efficiency of the substation fault diagnosis with multiple protections, the proposed method describes protection grades by varied weight of the transition vector in the Petri net models. According to relays and circuit breakers, special markings are produced in the diagnosis results that enhance the identifying capability of error information. The process of fault diagnosis is accomplished by algebra matrix calculation. A simulation on actual substation fault diagnosis process indicates that the improved method has fast calculation speed and high veracity
Fault Diagnosis of Substation Based on Petri Nets Technology
Generally, in substation operation ,when the system goes wrong, much of switch motion information, fault information and alarm information will be transferred from the protection devices to the SCADA system, most of them are correct while some of them maybe wrong. It is a difficult task for the operator to pick out the wrong one among so much information. Substation fault diagnosis is proposed to resolve this problem. The main task of substation fault diagnosis is using those information to get the correct diagnosis result of the fault section. Through the substation fault diagnosis, the operator can quickly grasp the essential information and take right actions in time. This paper use Petri nets theories to build the model of fault diagnosis and analyze the circuit breaker information and fault information of protection devices when power system is in fault states, the purpose is to get the right fault information through diagnosis.
Representation of systems disturbed by wide band noise
In this paper, a method of handling and working with wide band noise is developed. We represent wide band noise as a distributed delay of white noise and use it to reduce a nonlinear system disturbed by wide band noise to a nonlinear system disturbed by white noise. An application of this reduction to a nonlinear filtering problem under a wide band noise disturbance is discussed.