Performance Analysis of a Seamless Sliding Mode Control for a Non Isolated Multi-Input Multi-Output Bidirectional Dc-Dc Boost Converter for Electric Vehicle Applications

In this paper, a non isolated multi-input multi-output dc–dc boost converter is proposed. This converter is used to implant alternative energy sources in electric vehicles. However, advantages of different sources of energy are achievable by the implant energy sources. This converter has many outputs with different voltage levels, which can be interfaced with multilevel inverters. In this converter, the load power can be distributed flexibly between input sources, so that a proper control for charging and discharging of energy storages by other input sources can be achieved in a better manner. Using a multilevel inverter can lead to reduction of voltage harmonics, which in turn, reduces the torque ripple of electric motors in electric vehicles. A Small-signal model for each operation mode is extracted to design the converter control system. A unique sliding mode control with output filter in a smooth manner is used to regulate the bidirectional converter. By using this control strategy stability analysis can be made for both the step-up and step-down operating modes of the converter. In this paper the two types of bidirectional dc–dc converters— cascade buck boost capacitor in the middle and cascade buck boost inductor in the middle are compared and their performance is analyzed based on the parameters such as requirements of devices, switches and components rating, control strategy, and performance analysis for use in plug-in electric and hybrid electric vehicles. The simulation and experimental results are provided for both converter types and the validity of the proposed converter and its stability and the control performance are verified for different operating conditions. Keyword: Cascaded buck–boost; DC–DC converters; electric vehicle; hybrid power system; multi-input multioutput (MIMO); small signal modeling;