Development and Testing of the Adequacy of the 220/110 kV Distribution Substation Matlab Simulink Mathematical Model for Relay Protection Calculations

The article discusses the development of a mathematical model of a hub substation. Achieving the required parameters of stability and reliability of power supply is not always possible to achieve only the design and mathematical calculations of the power supply system. The use of a mathematical model allows achieving the accuracy of computing the parameters of the power supply system in various modes of operation, and makes it possible to use a single model to solve various problems that have the same mathematical description. The paper considers a nodal substation of an industrial enterprise with consumers having a powerful alternating load. To build a mathematical model, a graphical simulation environment MATLAB Simulink is used. In this environment, using standard blocks, a mathematical model of a substation with equivalent power sources is modeled based on load graphs and asymmetric modes. The paper assesses the adequacy of the model.