Study on Communication Fault Mechanism of IEC in Flexible DC Valve Control System
A converter station,the valve control system possesses the function to monitor the status of the interface re-ceiving the Merging-Unit and performs fault monitoring through waveform recording.The valve control's waveform re-cording backend monitoring detected a brief communication fault in the reception of the Merging-Unit by the overcurrent detection board.After investigation,the fault was pinpointed to be an abnormality in the received data frames of the over-current detection board.Specifically,when the received signal is non-homologous,the data frame signals collected by the processor exhibit glitches and bit width variations.This article proposes a software upgrade strategy for the cause of the fault,which solves signal processing faults by increasing signal sampling frequency and increasing signal recording.And a testing platform was built to verify the software upgrade strategy.After a long period of machine copying experiments,it was fully verified that the software upgrade strategy can effectively suppress communication faults between the overcurrent detection board and the merging unit.
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