Mode Decomposition Passivity-Based Control of Bidirectional Zeta-SEPIC DC-DC Converter

DC-DC converters are one of the most popular power electronic devices. In this work, Zeta-SEPIC DC-DC converter configuration is considered, which has a number of important advantages for electric drives of autonomous vehicles. The operation of this converter is described by two systems of nonlinear equations - respectively for the forward power transfer (FPT) and backward power transfer (BPT) modes. To develop a control system for such an object, the energy approach - passivity-based control (PBC) is applied. In particular, thanks to mode decomposition, two PBC subsystems were synthesized for FPT and BPT, respectively. A number of control system configurations were studied by means of computer simulation, among which the most effective ones were selected for each of the modes. In order to stabilize the static and dynamic indicators of the system, nonlinear dependencies of additionally introduced coefficients of interconnections were found, the effectiveness of which was confirmed by the simulation results.