Abstract
High efficiency and fast dynamic response are two main control objectives for dual active bridge (DAB) DC-DC converters. Traditional extended phase shift (EPS) control can significantly enhance the conversion efficiency of DAB DC-DC converters by reducing current stress; however, it cannot fulfill fast dynamic response requirements. In this paper, a novel hybrid control scheme consisting of EPS control and direct power control (DPC), named as EPS-DPC, is proposed. EPS-DPC control has salient features in both efficiency and dynamic performance. In order to verify the outstanding performance of the proposed EPS-DPC scheme, an experimental comparison was carried out on a scale-down DAB DC-DC converter among several control strategies, including single phase shift control with traditional voltage-loop (SPS-TVL), EPS control with traditional voltage-loop (EPS-VTL), and EPS-DPC. Experimental results have been high consistent with theoretical analysis, and verified these advantages of the proposed EPS-DPC scheme.
Highlights
Dual active bridge (DAB) DC-DC converters have several advantages, such as bidirectional power flow, high power density, easy implementation of zero-voltage switching, convenient access to cascading and parallelism
In the full range of k from 0 to 1, qE of Extended phase shift (EPS) is always smaller than qS of single phase shift (SPS), which validates that EPS can effectively reduce power reflow, compared with SPS
Based on a scale-down DAB DC-DC converter prototype, SPS-TVL, EPS control with traditional voltage-loop (EPS-TVL) and EPS-Direct power control (DPC) are compared in details
Summary
Dual active bridge (DAB) DC-DC converters have several advantages, such as bidirectional power flow, high power density, easy implementation of zero-voltage switching, convenient access to cascading and parallelism. A feed-forward compensation strategy [16], which feedbacks the load current to the control system, was used to improve transient response of DAB DC-DC converters in the load disturbance conditions. Direct power control (DPC) scheme is a popular active solution to enhance dynamic performance of AC-DC or DC-AC converters [22, 23]. The DAB DC-DC converter using EPS-DPC has advantages in both high efficiency and outstanding dynamic performance. A scale-down DAB DC-DC converter prototype was designed and built to test performance of the proposed EPS-DPC scheme, the EPS control with traditional voltage-loop (EPS-TVL), and the single phase shift (SPS) control with traditional voltage-loop (SPS-TVL).
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