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FU Hua,ZHAO Shanying,MENG Xiangyun.Single-phase Ground Fault Line Selection Approach for Small-current System Based on UKF and SPRT[J].JOURNAL OF POWER SUPPLY,2019,17(5):137-145
Single-phase Ground Fault Line Selection Approach for Small-current System Based on UKF and SPRT
Received:April 18, 2017  Revised:June 09, 2017
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DOI:10.13234/j.issn.2095-2805.2019.5.137
Keywords:small-current system  single-phase ground fault  unscented Kalman filter(UKF)  sequential probability ra-tio test(SPRT)  likelihood ratio  fault line selection
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
        
AuthorInstitutionEmail
FU Hua Faculty of Electrical and Control Engineering, Liaoning Technical University, Huludao , China
ZHAO Shanying Faculty of Electrical and Control Engineering, Liaoning Technical University, Huludao , China 286742195 8@qq.com
MENG Xiangyun Faculty of Electrical and Control Engineering, Liaoning Technical University, Huludao , China
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Abstract:
      To solve the existing problems in the single-phase ground fault line selection approach for small-current system such as lower accuracy and poor reliability, a single-phase ground fault line selection approach for small-current system is proposed based on unscented Kalman filter(UKF) and sequential probability ratio test(SPRT). First, a mathe-matical model of fault line is established based on UKF. Then, UKF is used to track and predict the characteristic information of system fault. The resulting residuals between the observed value of new information and the actual mea-sured value are used to calculate the likelihood ratio using the sequential probability ratio method. Moreover, a fault criterion is constructed, which can be used to quickly select the fault line. Results of a large number of simulations using ATP-EMPT and Matlab show that the proposed method has higher accuracy and reliability.
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