At high ambient temperatures, the performance of gas turbine power plants drops significantly. Technical solutions of compensation for losses associated with the constant injection of water into the air intake of a gas turbine. This approach is not acceptable in regions with limited fresh water reserves. Radical solutions are required to reduce the cost of generated energy. Integrated Combined Solar Cycle (ISCCS) technology has proven itself on many projects. The addition of a combined cycle gas cycle with solar energy can significantly increase the overall efficiency of the power plant. Despite the increase in costs during the construction of its solar part, the total cost of operating solar collectors is several times less than a turbine installation. Given the global trend to fight carbon emissions, switching to a hybrid scheme is economically attractive. Trading in carbon credits for CO2 emissions will significantly reduce the payback period for the construction of gas turbine modernization under the ISCCS scheme. This paper presents an option to modernize a gas turbine power plant in the city of Basra (Iraq), using the advantages of solar radiation and recycling of combustion products from gas turbines. It is proposed to equip the existing 200 MW gas turbine plant with two steam turbine units with a capacity of 75 and 65 MW, working in conjunction with solar collectors producing low pressure water vapor. Due to modernization, the efficiency of the power plant should increase from 38% to 55%. The revision of the schematic and technical solutions of Iraq power plants will allow producing sufficient energy for the region.

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.

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