The relevance of the study is due to the need to improve and expand the possibilities of calculating electrical circuits in transients. As an object for research, linear electric circuits of the second and higher order with zero initial conditions are considered. The main goal of the research is the task of performing dynamic calculations when simulating transients in linear high-order circuits by the methods of structural simulation in the Matlab Simulink software environment. The main attention is paid to the issues of constructing structural diagrams of high-order electric circuit models. The basis for the description of processes is the equation, compiled according to the laws of Kirchhoff, linking the instantaneous values of currents and voltages of the elements of the electric circuit through their parameters. Examples of numerical modelling using variants of models of structural circuits of the electric circuit are given. The advantages of the method of simulation structural modelling in the calculation of dynamic circuits with respect to existing analytical methods for calculating transients in high-order circuits are also considered in this paper.

Analyses of a power system are important for designing and operating phase execution monitoring and to ensure reliable grid operations by sufficient protection projects settings. In this paper, electrical model of a 340 MW integrated solar combined cycle (ISCC) located in the south of Iraq, is developed by Electrical Transient Analyzer Program (ETAP) and load flow, voltage stability and short circuit analyses are performed. Impact of power grid voltage instability on system buses of the power plant is estimated. Using load flow analysis that use Newton-Raphson algorithm, buses operating at under voltage due to power grid voltage instability are specified and their voltages are improved according to given voltage limitation that are based on buses criticality with regard to loads. On-load tap changers and reactive power compensation are used to improve steady state voltage stability. Optimal position for capacitor banks placement and number of capacitor banks are proposed by using optimal capacitor placement module of ETAP. The use of modern technology and advance planning have a big impact on reducing losses. The article shows that the lack of planning is one of the main causes of energy losses. The parameters of the module also indicate the voltage limits, bus voltage and ratings of available capacitor banks. The voltage limit is set at 95% ≤ V ≤ 110%, and it is global for all buses

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