LQI Control for Dual-input DC-DC Converter

This paper presents control design for a multi-input single-output dc-dc power converter, which is proposed to interface two battery sub-modules, or one battery and one fuel cell with the dc rail in an electric vehicle. Using an advanced control method, the system should ensure that the output voltage remains constant even when the load changes. The advantage of these types of converters is the high voltage gain and the reduction in the capacitor size on the output, while maintaining two channels to support the dc rail. A fair comparison between LQI and conventional control scenarios is done. The modeling of the converter, the LQI controller dynamics and the comparison results are presented in this paper.