Aplikace pro modelování elektrických sítí

Abstract

The aim of this diploma thesis is to create a program for the simulation of the electric power system operation. The simulations are performed on the model of distribution network which operates at the 110 kV voltage level. The user of the program can make various events in a single simulation of the power system operation and watch their impact on the values of the system variables. These events include changes of the network configuration (by switching on or off the individual lines) or changes of the amount of power which is taken or delivered at the nodes of the network. The created program is a tool that clearly displays the results of the simulation, the form of which can be influenced by a wide range of adjustable parameters. The program simulations consist of a sequence of states. The program creates descriptions of individual states by calculating a mathematical model set according to the setting for the appropriate time step of simulation. The program works in two simulation modes. In the first mode, the distribution network operates in connection with the superior transmission system which provides a balanced power balance in the distribution system. In the second mode, the distribution network is not connected to the transmission system by any line and the balanced power balance is achieved by regulation of the local power sources and the local power customers. The diploma thesis has a theoretical and practical part. The theoretical part describes in general the methods and principles used during the creation of the program. This part of the text deals with the general physical and mathematical description of the electric power systems, the general description of the difference between linear and nonlinear tasks, the general description of numerical methods used for solving nonlinear systems and the application of these numerical methods in solving the tasks analyzing steady operation of the electric power system. The second, practical part of the thesis describes the program for the simulation of electric power system. This section describes the functional kernel of the program that calculates the individual states of the simulation sequence and the graphical environment through which the user controls the program.