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中文摘要：
直流系统一般是双极并列运行，一极线路发生故障时可能会在健全极线路上产生较大的电压变化率和电流变化率，启动判据可能会启动，需正确选择故障极。为此，分析了直流线路的故障特征，分析发现，当直流线路发生故障时，故障极的极波波形远离于零轴，非故障极的极波波形在零轴附近变化，因此故障极的极波波形沿零轴的积分绝对值将远大于非故障极的极波波形沿零轴的积分绝对值。根据这一特征，提出了一种利用正、负极线极波波形面积比值的特高压直流输电线路故障选极方法。大量数字仿真试验结果表明，该方法抗干扰能力强、对高阻故障具有较强的鲁棒性。
英文摘要：
For the DC system with bipolar operation, when a pole line fault occurs, the non fault line is coupled to large change rates of voltage and current, by which the start criterion is easy to operate, so it is necessary for power system to select the fault pole. When fault occurs on DC line, the polarity wave of fault line is far from the zero ax is,and the polarity wave of non-fault line changes in the vicinity of the zero axis,so the absolute value of integral along the zero axis of the polarity wave on fault line is higher than that on non-fault line. According to these charac teristics,we propose a new method of UHVDC transmission line fault selection based on the ratio of polarity wave area of positive line and negative line. A large number of digital simulation results show that this method is of strong anti-interference ability and robustness to high resistance fault.
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