直流线路行波保护解析整定方法

发布时间：2019-06-18 22:35

【摘要】：直流线路行波暂态过程存在色散衰减、双极耦合等问题,导致故障量难以解析;保护装置采样具有随机性,进一步增加了判据特征量定量计算的难度,因此行波保护仍缺乏统一、有效的整定方法。从选择性、灵敏性要求出发分析了行波保护整定需求,针对关键故障位置建立了可用于整定计算的故障量解析模型。为消除保护采样随机性,提出了保护判据特征量解析计算方法。最后结合保护特征量随过渡电阻、雷击扰动幅值变化的特性曲线求取保护定值,该定值具有最优的抗过渡电阻能力和抗雷击扰动能力。与实际直流线路保护定值及保护边界的对比分析验证了所提解析整定方法的有效性。
[Abstract]:There are some problems in the transient process of traveling wave of DC line, such as dispersion attenuation, bipolar coupling and so on, which makes the fault quantity difficult to analyze, and the sampling of protection device is random, which further increases the difficulty of quantitative calculation of criterion characteristic quantity, so the traveling wave protection is still lack of unified and effective setting method. According to the requirements of selectivity and sensitivity, the setting requirements of traveling wave protection are analyzed, and an analytical model of fault quantity which can be used for setting calculation is established for the key fault location. In order to eliminate the randomness of protection sampling, an analytical method for calculating the characteristic quantity of protection criterion is proposed. Finally, the protection value is obtained by combining the characteristic curve of the protection characteristic with the transition resistance and the amplitude of the lightning disturbance, which has the optimal ability to resist the transition resistance and the ability to resist the lightning disturbance. The effectiveness of the proposed analytical setting method is verified by comparing with the actual DC line protection setting and protection boundary.
【作者单位】：华南理工大学电力学院;中国南方电网科学研究院有限责任公司;
【基金】：国家自然科学基金项目(51377059)~~
【分类号】：TM773

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