Research On Power System Fault Diagnosis Method Based On Information Structure Association Matrix

My country’s grid interconnection scale continues to expand.If local faults cannot be diagnosed and isolated as soon as possible,it will inevitably lead to fault cascades and expansion of fault areas.In addition,power grid fault diagnosis is often trapped by massive and complex component operating status and alarm information,and even faces uncertain factors such as circuit breaker or relay protection device refusal,misoperation,information misreport,omission,etc.These problems bring great difficulties to fault diagnosis,but also reduce the efficiency and accuracy of fault diagnosis.The analytical model can consider these issues to the greatest extent,which is beneficial to the current grid fault diagnosis under the background of big data.Therefore,a fast and accurate power grid fault diagnosis analysis model will help speed up the handling of accidents and the recovery process of the system,and play a vital role in ensuring the reliable operation of the power grid and the quality of power consumption by users.According to the structure of the power grid,this article first studies the matrix topology and the association description method between the components,the relay protection device and the circuit breaker.And use the matrix operation to establish the mapping relationship between the protection device and the circuit breaker,construct the action analysis model between the component,the protection and the circuit breaker,and then establish the relay protection action network of the protection and the circuit breaker associated with the component.Then define each connection arc of the relay protection action network as an action event,and construct an event relationship matrix according to the relationship between the events,and then further establish a power grid fault diagnosis analytical model that takes into account the protection information.Finally,considering the influence of the action sequence of the relay protection device and the circuit breaker on the power grid fault diagnosis,the action sequence of the protection is integrated into the static relay protection action network to form a relay protection action network containing sequence information.Then establish an analytical model of power grid fault diagnosis that takes into account the action sequence.Test and analyze the power grid fault diagnosis analytical model through a typical four-zone transmission network simulation model and a 220 k V line in a certain area of Sichuan power grid.The analysis of the results shows that the method proposed in this paper can diagnose the refusal and misoperation of the relay protection and the circuit breaker while diagnosing the faulty element,and can also diagnose the false alarm and omission of the alarm information.And the accuracy of the fault diagnosis results is high,and there will be no misjudgment or missed judgment of the faulty component.