INTELLIGENT SYSTEM FOR MEASURING ACTUAL POWER LOSSES OF AC OVERHEAD LINE

Abstract

Intellectualization of control is the main trend in the development of modern electric power industry. With the introduction of universal measuring complexes and specialized devices for measuring and recording mode parameters based on personal computers in the electric power industry, interest has increased in determining the total active power losses in an overhead line by measuring active powers at the ends of the line and isolating corona power losses from them. Direct state estimation based on the Kipnis-Shamir relinearization method. The resulting new nonlinear measurement equations become quadratic voltage polynomials in a rectangular coordinate system. The method uses two transformations of the original system into a system of higher dimension to solve quadratic variables in a non-iterative way. With accurate measurements, this method gives the same results as the weighted least squares method. It is proposed to use a specialized system for monitoring the operational assessment of the mode parameters and the overhead line circuit based on the current mode parameters at the ends of the ultrahigh voltage overhead line. The systematic error of the measurement system is determined. Experimental studies of simultaneous measure- ments of the mode parameters at the ends of the overhead line were carried out using the example of an overhead line of ultra-high voltage of the Azerbaijan energy system based on an automated system that includes intelligent measuring instruments and specialized measurement systems with personal computers with registration with an averaging time of 10 minutes over a period of seven days. Systematic errors in monitoring the electrical parameters of overhead lines at the beginning and end of overhead lines are about 0.1 percent, and the absolute values of measurements vary within 0.5 MW. It has been established that the measurement accuracy lies within the limits obtained by modern intelligent measurement systems. The results of estimating the state of the mode parameters based on the non-iterative relinearization method have advantages in terms of speed and reliability of obtaining a solution in the operational control of modes of overhead lines of ultrahigh voltage.