Selecting the Overhead Power Line Model in Simulating Its Operating Mode Based on Synchronized Phasor Measurements
The article addresses matters concerned with selecting an adequate overhead power line mathematical model for analyzing steady-state operating conditions in a real time mode based on the results of synchronized phasor measurements. A method and an algorithm for more accurately simulating the system based on the values of operating parameters at the overhead power line ends obtained from the synchronized phasor measurement units (PMUs) taking into account the actual weather conditions are proposed. The suggested method involves selecting the number of sections in the overhead power line ladder model at which acceptable accuracy is achieved as compared with the PMU instrumental errors. The methodical errors of well-known simplified steady-state models as compared with the overhead power line equations with distributed parameters are investigated on the basis of operating mode state assessment. By applying the proposed approach it becomes possible to achieve better accuracy in analyzing steady-state operating conditions, in evaluating the state and identifying the overhead power line electrical parameters, and to ensure more efficient online control of a power transmission line. The parameters of a real 500 kV power line were used in carrying out the study.