1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China; 2. State Power Economic Research Institute Beijing 102209 China
Abstract：HVDC protection value setting is difficult to be analytically calculated, because of its strong nonlinearity. So far, the combination of empirical value and simulational verification is the most available method used in actual project. However, the method may induce large workload, low setting efficiency, and possibility of neglecting some faults. And accidents caused by irrationally protection value setting have repeatedly taken place in actual projects. In view of the current situation, the characters of present protections are systematically summarized from the perspective of value setting. According to protection principles, all present protections are classified into line protection, differential protection, overload protection, switch protection and other protection. Aiming at the character of line protection and differential protection that detects certain fault, the setting process based on fault feature is proposed. The setting processes for other three categories are generalized. The system of HVDC protection value setting, which has the function of automatic value setting, value inquiry and value comparison, is developed to improve the automatic degree of HVDC protection value setting.
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2015, Vol. 30 
