考虑直流控制的直流输电线路短路电流变化特性研究

发布时间：2018-06-01 01:24

本文选题：短路电流 + 时空变化特性　；参考：《电力自动化设备》2014年12期

【摘要】：推导了考虑分布参数特性的直流线路固有短路电流时域解析表达式,指出在不考虑控制作用时固有短路电流随故障持续时间增加而逐渐上升,近距离故障时的短路电流大于远距离故障时的短路电流,符合短路电流发展的时间约束和物理边界条件约束。分析了直流控制对短路电流变化的影响,揭示了在控制作用下短路电流幅值的空间非单调变化特性和时间离散变化特性,突破了传统短路电流变化特性的认识局限。短路电流幅值的空间非单调特性使得直流线路保护电流变化量判据的保护特征量电气边界与输电线路物理边界不一致,时间离散性使得保护特征量电气边界随故障时刻呈锯齿状变化,在进行直流线路保护电流变化量判据的整定计算时应予以考虑。
[Abstract]:The analytical expression of the inherent short-circuit current in the DC line in time domain considering the characteristic of distributed parameters is derived. It is pointed out that the inherent short-circuit current increases gradually with the increase of the fault duration when the control action is not considered. The short circuit current in the short distance fault is larger than the short circuit current in the long distance fault, which accords with the time constraint of short circuit current development and the physical boundary condition constraint. The influence of DC control on the variation of short-circuit current is analyzed, and the spatial non-monotone variation and time-discrete variation of the amplitude of short-circuit current under the control are revealed, which breaks through the limitation of the traditional short-circuit current variation. The spatial non-monotone characteristic of the amplitude of short-circuit current makes the protection characteristic of DC line protection current variation criterion inconsistent with the physical boundary of transmission line. The time discreteness makes the electric boundary of the protection characteristic variable change with the fault time, which should be taken into account in the setting calculation of the DC line protection current variation criterion.
【作者单位】：华南理工大学电力学院;中国南方电网超高压输电公司广州局;
【基金】：国家高技术研究发展计划(863计划)资助项目(2012AA-050209) 国家自然科学基金资助项目(51077055)~~
【分类号】：TM721.1

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