A Novel Approach for the Control of Dual-Active Bridge DC-DC Converter

Abstract

During these days high frequency dc-dc converters are frequently used in high Power Electronic applications. It is well known fact that the size of the passive components, such as inductors, capacitors and power transformers decreases as the frequency increases. It is well known that high-voltage converters in the power range of 1-10MW have excessive switching losses at the switching frequencies higher than 4 kHz. The favorable DC-DC converter is realized to be the Dual-Active Bridge when a bi-directional power flow is demanded; however the most important problem is to design an appropriate controller for this type of converter. Switch-mode power supplies represent a particular class of variable structure systems (VSS) and have advantage of non-linear control techniques developed for this class of systems. The sliding mode control can handle large power supply and load variations and provides good dynamic response and simple implementation. The sliding mode controller design has become famous choice for non-linear dynamic systems having class of uncertainties. Moreover, it is maximally robust to all unmatched uncertainties. In this paper the sliding mode control is reviewed and its applications to dc-dc converters are discussed.KeywordsDC-DC convertersHigh-powerDual-Active BridgeSliding Mode Control