Abstract
A fast dynamic response is one of the key demands for the dual active bridge (DAB) dc-dc converter to achieve a well-regulated output voltage over a wide range of operating conditions. Recently, model predictive control (MPC) has become a promising alternative to achieve fast dynamic response when compared to other classical converter control techniques. This paper presents an MPC based control approach augmented with a current stress optimized scheme based on triple phase shift (TPS) modulation to improve the dynamic performance and maintain a desired output voltage level without violating a minimum current stress constraint. A prediction model has been developed to accurately predict the dynamic behavior of the output voltage in the next horizon under the input voltage variations and load disturbances. As the model is developed using the TPS modulation thus inner phase shifts of the H-bridges as well as system's states are required to solve the formulated control problem. The inner phase shifts of the H-bridges are calculated using current stress optimized TPS scheme. Simulation and experimental results are provided to demonstrate the merits of the proposed control algorithm which includes a fast dynamic response without no overshoots in the output voltage, fixed switching frequency, low computational complexity and high degree of robustness.
Highlights
I SOLATED dual active bridge (DAB) dc-dc converters, first proposed in [1], have received significant attention from the research community recently
The power transfer and output voltage level of the converter can be controlled by single phase shift (SPS) modulation which modulates the phase shift ratio between the two H-bridges to obtain the required set points
This paper proposes an model predictive control (MPC) technique with current stress optimization (CSO) based on the unified triple phase shift (UTPS) algorithm presented in [25] for a DAB dc-dc converter, to improve the dynamic performance and provide a well-regulated output voltage while realizing minimum current stress
Summary
I SOLATED dual active bridge (DAB) dc-dc converters, first proposed in [1], have received significant attention from the research community recently. Compared with other modulation schemes, TPS utilizes all three available phase shift ratios and can maximize efficiency It offers the advantages of reduced current stress and elimination of reactive power in the high frequency ac link, increasing the efficiency of the DAB dc-dc converter. This paper proposes an MPC technique with current stress optimization (CSO) based on the unified triple phase shift (UTPS) algorithm presented in [25] for a DAB dc-dc converter, to improve the dynamic performance and provide a well-regulated output voltage while realizing minimum current stress. The optimal phase shift values resulting in minimum current stress and the transmission power ranges arising from the optimal control parameters of each mode are given in the Table. The output voltage for the state can be predicted by: V0(k
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