2021 12th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC) | 2021
Hyper-Plane Sliding Mode Control of Non-Minimum Phase Grid-Connected Zeta Converter
Abstract
In this paper, a hyper-plane sliding mode controller (SMC) is presented for regulate of dc-link voltage of the grid-connected Zeta converter along with control of ac current of the grid. To unified analyze of the system, averaged state-space model of the grid-connected Zeta converter is presented. Although from point of structure view, the system is seen as a single-input single-output system, based on control strategy, it is a multi-input multi-output (MIMO) system. Due to nonlinear characteristic of the converter and unstable-zero dynamic problem which lead to non-minimum phase of the capacitor voltages, hyper-plane SMC is used to indirect regulate of the dc-link voltage by inductors’ currents. Therefore, by considering the nonlinear operation of the system, a two-stages controller based on unified model of the system is designed to insure the converter stability in wide range of output variables. To validate the performance of the presented controller, the system is simulated by MATLAB/Simulink software and results are shown to prove the controller accuracy.