CONTROL ALGORITHMS FOR MULTISTAGE NON-SYMMETRICAL PWM DC-DC CONVERTER WORKING FOR A COMMON LOAD

A system containing two semiconductor AC-DC voltage converters and a storage battery, working for a common DC load were considered. The devices contain multistage non-symmetrical PWM DC-DC converters, which stabilize currents or voltage at the output or charge current of the battery (depending on the specified operating mode). The algorithms for the control of converters were considered, which make it possible to ensure all modes of operation of the system in the absence of interconnections of converters in control circuits. Modes of voltage stabilization, battery charging current and converter currents in transient operating modes are considered, taking into account the exchange of energy between the converters. Mathematical and computer models of the system have been built. Calculations of electromagnetic processes are performed, diagrams of voltages and currents in the system in various modes of operation are given. The prerequisites for the occurrence of unacceptable overvoltages and means of limiting voltages are indicated.

Authors: A. G. Vorontsov, A. R. Mamutov, M. V. Pronin

Direction: Electrical Engineering

Keywords: Pulse-width modulation (PWM) converter, multistage, parallel work, energy recupertion, overvoltages, modeling, calculation

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