An Automatic Control System of a Power Converter Based on a Freely Configurable Virtual Synchronous Generator Structure
Abstract
One of the trends in the development of modern electric power systems is a widespread use of renewable energy sources, which include a power converter through which the generating units are connected to the grid. The introduction of such installations entails problems with ensuring reliable and efficient maintenance of frequency and voltage in the grid, which are associated with the conventional approach to their control. An effective way of solving these problems is to use an alternative strategy for the control of renewable energy sources, in the framework of which many scientific groups have proposed a concept based on a virtual synchronous generator. In this case, the power converter changes from grid-following to grid-forming mode, similar to the conventional synchronous generation. However, existing approaches imply a series control system structure with a stiff direction of signals. This gives rise to fundamental problems inherent in such a structure, e.g., interdependence in control of active and reactive power. A freely configurable structure of a virtual synchronous generator is proposed for implementing a power converter automatic control system, in which its structural units and control loops can be shifted from one level to another, and the levels themselves can be located not only in series but also in parallel. It is shown that for the synthesized structure, the most effective control of frequency and voltage, as well as damping of oscillations, are provided. Results of qualitative and quantitative comparison of the proposed control system with the conventional structure of a virtual synchronous generator are presented. Experimental studies are carried out by means of mathematical modeling.
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Исследование выполнено за счет гранта Российского научного фонда № 21-79-00129
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The research was carried out at the expense of the grant of the Russian Science Foundation No. 21-79-00129