Optimized Design and Fast-Dynamic Control for ISOP-Connected Hybrid CLLC-DAB System With Partial Power Processing Property

This article presents new design and control approaches for an input-series-output-parallel (ISOP) connected hybrid converter with partial power processing (PPP) capabilities, which comprises a CLLC converter and a dual-active-bridge (DAB). In this hybrid CLLC -DAB configuration, secondary-side brid...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2024-07, Vol.39 (7), p.8844-8857
Main Authors: Wei, Ruizhi, Li, Yunwei Ryan
Format: Article
Language:English
Subjects:
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Adaptive control
Adaptive fast dynamic response control (AFDRC)
Configurations
Control systems
Design optimization
dual-active-bridge (DAB)
Dynamic control
Dynamic response
Efficiency
Electric bridges
Electric converters
Hybrid power systems
Hybrid systems
Microgrids
Parameters
partial power processing (PPP)
Power flow
Resonant frequency
Robust control
Switches
Topology
Transient performance
Vehicle dynamics
Voltage control
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Description
Summary:This article presents new design and control approaches for an input-series-output-parallel (ISOP) connected hybrid converter with partial power processing (PPP) capabilities, which comprises a CLLC converter and a dual-active-bridge (DAB). In this hybrid CLLC -DAB configuration, secondary-side bridges are shared between CLLC and DAB topologies to minimize the number of utilized switches. Incorporating the high efficiency of CLLC with the exceptional control flexibility of DAB, the hybrid configuration transfers the main power through CLLC while enabling DAB to handle partial power flow. The power distribution between CLLC and DAB is optimized, considering system efficiency, dynamic response, etc. Based on the resulting power ratio, system parameters are also optimized, including considerations for soft-switching of all switches in a wide load range, output power capacity, component tolerances, and overall efficiency. Furthermore, the output voltage can be accurately regulated by manipulating the phase shift angle of DAB. To enhance the system's transient performance in scenarios involving varying loads and input voltages, an adaptive fast dynamic response control strategy exhibiting robustness against variations in system parameters is also proposed. Finally, experimental results validate that the hybrid CLLC -DAB system, employing the proposed design methodology and control strategy, attains both high system efficiency and ultrafast dynamic response.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2024.3389588