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中文摘要：
构建基于极波的特高压直流输电（ultra high voltage DC，UHVDC）线路暂态保护的启动元件、边界元件、雷击干扰识别元件和故障选极元件。线路故障后，保护安装处量测的极波首波头幅值比其对应的极线电压、线模电压和零模电压首波头幅值大，且更为陡峭，故利用极波变化率构造启动判据；利用极波信息熵测度对故障特征进行定量描述、分析和估计来形成区内外故障的识别判据；雷击故障的极波波形远离零轴，而雷击未故障的极波围绕零轴交替变化，故利用短窗内极波采样值直接求均值来构建快速的雷电干扰识别算法；故障极极波与零轴构成的面积远大于非故障极波与零轴构成的面积，故利用正负极的极波与零轴构成的面积之比进行故障选极。时窗取为5ms，避开控制系统响应对暂态保护的影响。PSCAD仿真结果表明，所提极波暂态量保护原理正确，算法有效。
英文摘要：
A protection scheme that amalgamates the start element, the boundary protection element, lightning interference recognition element and the fault-line detection element is proposed for ultra high voltage DC （UHVDC） transmission line. Compared with polarity line voltage, line and ground mode, the amplitude and the velocity of variation of the first fault transient of pole wave are larger, thus the velocity of variation of pole wave is used to activate the start element. The information entropy is applied to describe, compare and estimate the feature of the fault transients to distinguish the internal faults from external faults. The absolute value of the pole wave caused by lightning strokes caused faults is far from zero axes. The value of the pole wave caused by lightning disturbances is around zero axes. The mean value of the pole wave is calculated to distinguish lightning disturbing. The area of the fault line pole wave with zero axes is much more than the non-fault line. The ratio of the positive pole wave area to the negative pole wave area is chosen to determine the fault line. The time window is taken as 5 ms to avoid the control system response to the transient protection. A large of simulation results with PSCAD show the protection principle is trustworthy and the method is reliable.
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