The Study Of Frequency Parameter Measurement Of Transmission Line Under Synchronized Information

Transmission line is the vector of power transmission, it is an important part of power system and plays important role in power system. Frequency parameters of transmission line is essential to power flow calculation, short-circuit current calculation, protection setting calculation and the selection of power system operation mode. More and more transmission lines have appeared with the continuous development of power system.Due to limited line corridor, more and more lines with mutual inductance have increase. Beacause of mutual inductance coupling circuits, the traditional measurement methods have been unable to meet the measurement needs, seeking new methods of measurement is particularly important. In this article, comparatively analyze the frequency parameter measurement methods of transmission lines based on comprehensively comparing of it. In the MATLAB environment, build a Single-circuit and a double-circuit transmission line models through the blocks in Simpower system and carry on simulation. And introduce the concept of robustness of algorithms for frequency parameters of transmission line. Respectively select higher precision, better stability of the measurement method by comparison of the robustness of each algorithm. The selected algorithm is verified by calculating the accuracy of measurement. Finally, develop the software using Microsoft Visual C #. The software can not only computing the data, but also with the database connection, you can save and query the dates.