Implementation of Vector control for Single Phase Dual Active Bridge to achieve ZVS and ZCS for Switching Loss Reduction

Abstract

The Dual Active Bridge (DAB) is one of the bidirectional converters in the High frequency Power processing with galvanic isolation, is widely preferred in many industrial applications. Historically, the power flow in the DAB is accomplished by popular phase shift control. The reduction of switching losses in the high voltage (HV) side converter by both Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) cannot be achieved simultaneously in the phase shift control. In this paper, the limitations of the phase shift control are conquered by the vector control. Vector control technique ascertains active and reactive power flow in a controlled fashion inside the bridge and thus able to position the DAB current in phase with the HV side DAB Voltage for ZVS as well as ZCS of the device. However judicious control of the active and reactive components of the current depends on appropriate current sensing, filtering mechanism and very fast parallel processing of the data. This paper mainly emphasizes on the decoupling of active and reactive currents using digital Band Pass Filter (BPF) followed by Second Order Low Pass Filter (SLPF) and vector control implementation technique in the real time control hardware. The control implementation methodology is discussed with the support of necessary experimental results presented in the paper.