Simulation of thyristor-controlled reactor using susceptance-to-firing angle conversion with regression models

This paper describes an approach to simulation of thyristor-controlled reactor (TCR) with automatic voltage regulator (AVR). Two approaches to design susceptance-to-firing angle (B-to-alpha) conversion block were considered. First one is look-up table approach, second one is based on fitting inverse relationship between firing angle of thyristors and susceptance by using regression models. Despite that look-up table is common way to obtain firing angle from input susceptance by searching for the appropriate angle from a table with pre-calculated values, the regression model based approach shows better perfomance in terms of increasing speed of calculations and simplicity of modelling. Regression models might be used in order to decrease delays in control system of TCR. Different regression models are derived and compared. A numerical comparison with the classical look-up table approach is given.