Research on the Fault Analysis and Protection Scheme of the Dynamic DC Microgrid
Considering the emerging dynamic DC microgrid technology,which can flexibly change the network topology according to the demand of the power grid operation,and considering the impact of the output uncertainty of distributed power sources on protection,an adaptive longitudinal protection scheme based on overcurrent is designed with the help of intelligent electronic devices(IEDs)to address the time-varying characteristics of various influencing factors.Firstly,taking bipolar DC microgrid as the research object,we analyzed the fault current characteristics and quantitatively analyzed the impact of various factors on protection;second,an improved overcurrent detection criterion was used to detect short-circuit faults,and the fault line location was achieved through communication between intelligent electronic devices.This protection scheme can update the protection setting value in a timely manner after changes in the operating status of the DC microgrid,and has satisfactory anti-transition resistance performance.Finally,a radiation type bipolar DC microgrid model was constructed using MATLAB/Simulink to verify the effectiveness of the proposed protection scheme.
dynamic DC microgriddistributed generationfault detectionIEDadaptive protection
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