Analysis of Abnormal Condition of Circulating Current of the Bridge in the HVDC Flexible Valve
HVDC Flexible has great application value in power transmission of solitary island,urban power grid and grid connection of distributed generation.In this paper,the general situation,system connection and operation mode of Shanghai HVDC flexible transmission demonstration project is introduced.Then a fault of the system is analysed.In the trial operation,because the control parameters and structure of the bridge was not adequate,the circulating current of the bridge in the HVDC flexible value increased progressively.And finally overcurrent protection action occurred.The parameters and structure of the bridge was optimized through commissioning,the control performance of the system was improved and the problem was solved as last.
HVDC FlexibleGrid connection of distributed generationHVDC flexible valueCirculating current of the bridgeControl performance
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