Calculation of electric network modes in real-time using the “Rezhym” software suite

Abstract

The article presents a software suite for calculating the modes of an electrical network. Theoretical foundations of calculation, general information about the software suite, and recommendations for working with it are provided. It is shown that the theoretical basis of the software suite includes nodal equations and modifications of the Newton's method. Nodal equations are used to model various modes of electrical networks (steady-state, post-fault, heavy load). Nonlinear nodal voltage equations describe the steady-state operation of the electrical system with nonlinear current sources specified. The nodal voltage equations are presented in the form of power balance equations and matrix notation. In solving the equations for steady-state operation, the variables used are the magnitude and phase angles of voltage at nodes (U and δ). The article explains how the nonlinear system of steady-state equations is solved using the Newton's method, where a linearized system of equations is solved at each iteration step, with convergence control based on the vector of mismatches. The computer program's algorithm is implemented through input data module, the basic module, and the results output module. The article discusses the main conditions for running the program, which include a minimum requirement for technical resources such as a personal computer. The system software used by the program should be an operating systems starting from Windows 95 and above. The operator using the program should have practical skills in working with the graphical user interface of the operating system. The article highlights the significance of the basic module, which is the main component consisting of initial data processing procedures and information output as per the user's request. The basic module allows for real-time changes in initial data values and calculations with new values. The software suite enables calculations to be conducted in real-time. The program was developed and modernized at the Department of Electrical Power Transmission of the National Technical University “Kharkiv Polytechnic Institute”. The programs have been implemented in the educational process and scientific activities of the department.