D.V. Shushpanov1

1 Bonch-Bruevich Saint Petersburg State University of Telecommunications (Saint Petersburg, Russia)

1 dimasf@inbox.ru

Parallel connection of power modules is used to increase power and provide redundancy. The stability analysis of two parallel-connected voltage converters without current-sharing control is practically not considered in the literature. To analyze the stability of parallel-connected voltage converters with current-sharing control, automatic control theory is used, which, unfortunately, does not take into account all the features of the electrical circuit. Therefore, the stability analysis of parallel-connected voltage converters is still relevant. To solve this issue, it is first necessary to consider the stability analysis of two parallel-connected voltage converters without current-sharing control from the standpoint of electrical circuit theory, which will allow us to further consider the stability analysis of parallel-connected voltage converters with current-sharing control. The article examines, from the standpoint of electrical circuit theory, the stability analysis of two parallel-connected pulse voltage converters without current-sharing control. The possibility and reason for the occurrence of a self-oscillating mode in a system of two parallel-connected pulse voltage converters without current-sharing control are shown. It is shown how to evaluate, based on the frequency characteristics of a single voltage converter, whether a stable mode will be achieved when such voltage converters are connected in parallel.

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