Analysis of the influence of the volt-ampere characteristics of the voltage rectifiers on the static characteristics of hydrogen electro-lyser load

Traditionally, determination of static load characteristics is one of the main stages in the preparation of a design model of an electric power system. It is especially important to correctly take into account energy-intensive industries, which make a huge contribution to the formation of these characteristics. In particular, the increased interest in hydrogen technologies observed in the world, as one of the most promising high-tech areas of energy development, and an increase in the share of the installed capacity of generation facilities based on renewable energy sources determine the prospects for the development of hydrogen production by the electrolysis of water. Accordingly, a significant increase in the scale of application of hydrogen technologies, in particular in accordance with the EU Hydrogen Strategy for the production of "green" hydrogen, determines the problem of forming correct mathematical models of these devices in terms of planning modes, analyzing them influence on the parameters of electric power systems. Due to the complexity of the physical experiment, especially significant increase or decrease the voltage in a node of an electric power system, it seems relevant to simulate a part of the consumer in order to identify their electric power characteristics. In this paper the results of correction of the static load characteristic of electrolysis tank, which is widely used in the production of aluminum, are presented. Analysis of these results, obtained by MATLAB software, is carried out by using the least squares method to regress the data and to obtain a polynomial function of static load characteristics. According to this analysis, the static load characteristics of electrolysis tank have a parabolic dependences of active and reactive power, the position of which is determined by the parameters of the supply scheme and current-voltage characteristic of rectifiers. For instance, it shifts the vertex of the parabolas, which should be taken into account to improve the accuracy of the calculation scheme.

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