| Power line is one of the main components of power system,It is a very important work to get accurate parameters of the power line.The traditional calculation method of power line parameters is accurate physical calculation method,Although the parameters of the circuit can be calculated.However,the influence of power frequency on line parameters is not considered.Inner Mongolia Power Company has established a perfect synchronization measurement system based on global positioning system,The system integrates data acquisition,storage and analysis into one,which forms a complete independent parameter acquisition system.It provides reliable and detailed data for Inner Mongolia power network dispatching.This paper introduces the acquisition device of PMU system used in Inner Mongolia power system and the background data acquisition function of Inner Mongolia electric power control center.This method uses the real time phasor of voltage and current at both ends of transmission line,the measured voltage and current phasors are converted by symmetrical component method,The parameters of the circuit are solved by the equivalent parameter circuit model of the power line.This method not only eliminates the traditional power outage measurement can not be avoided for the line zero sequence parameters of many effects,but also to avoid cumbersome wiring.According to the measured line parameters are affected by many natural factors which lead to the inaccurate calculation.In this paper,the influence of climate,geography and other factors on the line parameters are analyzed.The relationship between line impedance and environment is obtained,which based on a large amount of collected data and calculation results.Through the analysis of the results,it is found that the method has many advantages,such as accuracy,real-time and shortcut.In addition,this method avoids the shortcomings of traditional measurement methods,such as time-consuming and labor-consuming,and also has good economy... |
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