输电线路虚拟有功功率差动保护

发布时间：2018-07-21 09:30

【摘要】：有功功率差动保护在消除线路分布电容影响、应对高阻故障等方面独具优势,但近处金属性故障时的性能缺陷限制了其实际应用。为解决此问题,文中依据叠加原理,提出了虚拟有功功率的概念,并对内、外部故障时线路两端虚拟有功功率的特征进行了分析。以此为基础,提出了分相虚拟有功功率差动保护动作判据,并对其动作特性进行了定性分析。借助PSCAD搭建500kV输电线路模型,全面仿真和评估了不同故障位置、故障类型、过渡电阻、无功元件调整、非同步数据等多种因素对保护方案的影响。理论分析及仿真结果表明,该保护方案可准确辨别故障区间且近处金属性故障无死区,耐过渡电阻能力较强,数据交换量少,同步要求低,无需电容补偿措施。
[Abstract]:Active power differential protection has unique advantages in eliminating the influence of line distributed capacitance and dealing with high resistance faults, but its practical application is limited by the performance defects in the near fault of gold attribute. In order to solve this problem, the concept of virtual active power is proposed according to the principle of superposition, and the characteristics of virtual active power at both ends of the line under internal and external faults are analyzed. Based on this, the action criterion of split phase virtual active power differential protection is proposed, and its action characteristic is analyzed qualitatively. With the help of PSCAD, a 500kV transmission line model is built to simulate and evaluate the effects of different fault location, fault type, transition resistance, reactive power element adjustment, asynchronous data and other factors on the protection scheme. The theoretical analysis and simulation results show that the proposed protection scheme can accurately identify the fault interval and the gold attribute fault has no dead zone, strong resistance to transition, less data exchange, low synchronization requirements, and no capacitance compensation measures are needed.
【作者单位】：电网智能化调度与控制教育部重点实验室(山东大学);许继集团有限公司;
【基金】：国家重点研发计划资助项目(2016YFB0900600)~~
【分类号】：TM75;TM773

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