Robust control of parallel DC-DC buck converters by combiningintegral-variable-structure and multiple-sliding-surface control schemes

摘要

We develop a robust controller for parallel DC-DC buck convertersnby combining the concepts of integral-variable-structure andnmultiple-sliding-surface control. The advantages of the scheme are itsnsimplicity in design, good dynamic response, robustness, ability tonnullify the bus-voltage error and the error between the load currents ofnthe converter modules under steady-state conditions, and ability tonreduce the impact of very high-frequency dynamics due to parasitics onnthe closed-loop system. We describe a method for determining the regionnof existence and stability of the sliding manifolds for such parallelnconverters. The results show good steady-state and dynamic responses