【摘要】 提出一种基于p型等效线路模型的在线计算线路正序参数,利用T型支接线路三端正序电压和电流的突变量进行故障定位的自适应算法。该算法利用正常运行时的各端口的电压、电流,在线计算线路的正序参数;利用故障附加分量电压值来判断故障支路,在此基础上,将非故障支路化简合并,得到故障时支接点的等效电压、电流,再对故障支路应用双端测距算法进行高精度的故障测距。将在线计算得到的参数用于故障测距,解决了线路实际参数与电力局提供参数的不同、线路参数在运行过程中的不确定性等因素引起的测距误差问题。本算法的测距精度不受故障类型、故障电阻、系统阻抗及负荷等的影响。EMTP仿真结果验证了所提算法的正确性和高精度。更多还原

【Abstract】 An adaptive fault location algorithm for three-terminal transmission lines is presented. Superimposed fault component of voltage, currents of the teed lines are employed to solve the equivalent source抯 impedance of the three terminals and to identify the faulted branch line. Normal operation voltages and currents at each terminal of line are used to calculate the positive sequence parameters of the line. The equivalent voltage and current at the branch node is obtained by the equivalent calculation of the healthy branches. Then the two-terminal fault location algorithm can be applied to implement high accurate fault location. On-line calculated parameters solve the problems such as practical parameters being different from parameters provided by electric power company, the uncertainty of line parameters during operation. On-line calculated source抯 impedance solves the asynchronous problem of the data of the three terminals. The proposed algorithm is independent of fault type, fault resistance at fault point, generation mode and load, etc. Extensive EMTP simulations have been performed, and the results verified the validity and high precision of the algorithm.更多还原