ACTIVE ANTENNA IN MEASUREMENTS OF ELECTRICAL PARAMETERS OF SOLAR ELEMENTS

Abstract

The purpose of the work is to substantiate the use of an active antenna in the method of non-contact measurement of electrical parameters of individual solar cells as part of a photovoltaic solar panel. The main tasks of this scientific direction are the development, modeling and experimental verification of an active antenna as part of the measuring path of the system for non-contact measurement of shunt resistance and electric capacity of individual solar cells as part of a photovoltaic solar panel. The measurement algorithm consists in passing a sinusoidal signal from a functional generator through the external contacts of the solar panel. At the same time, a sensor in the form of a flat antenna is installed one by one above the individual solar cells, on which a sinusoidal signal is applied, which depends on the total shunt resistance of previously located solar cells. Based on the uniformity of the decrease in the signal amplitude from the antenna as it approaches the end of the line of solar cells, a conclusion is made about the difference in the shunt resistance of the cells relative to each other. The calculation of the shunt resistance of individual elements is performed according to the equations from the theory of electric circuits. Before starting the measurements, the shunt resistance of the solar battery as a whole is determined separately. An active antenna with two separate sections allows you to receive an amplified signal, which is the difference between the signals from two adjacent solar cells. This variant of the method speeds up the cycle of non-contact measurements and increases their accuracy. The simulation of the measurement scheme with an active antenna was previously carried out in the Multisim11 package, which accelerated the development and helped to determine the optimal parameters of the element base, as well as the parameters and characteristics of the measurement signal.