Multi Source Fusion Wide Area Backup Protection Based on Interval Evidence Theory
For insufficient reliability existing in traditional protection schemes in photovoltaic(PV)access systems,a multi-source fusion wide area backup protection scheme based on interval evidence theory is proposed.Firstly,the impact of the PV output current on protection is decoupled and analyzed,and a basic probability allocation function for the protection scheme is proposed.The values of 0 and 1 in traditional protection results are transformed into interval values that describe the fault probability so that the impact of the PV access on the distribution network protection can be quantitatively considered.Secondly,the improved interval evidence theory is used to fuse the discrimination results of multiple protections,obtaining the comprehensive fault probability interval for each line,and further identifying the faulty line.This method quantifies the impact of PV connection on protection discrimination and utilizes multiple comprehensive protection judgments to improve the reliability of the wide area backup protection.Meanwhile the improved interval evidence theory can eliminate the impact of conflicting evidence and can reliably identify faulty lines in the presence of data missing and errors.Finally,the reliability of the proposed method is verified through simulation.
photovoltaic power supply10 kV distribution networkbackup protectioninterval evidence theoryrelay protection
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