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| Triple-Phase-Shift Optimal Control of Dual-Active-Brige DC-DC Converter with Current Stress Optimization and Virtual Voltage Compensation |
| Cai Fenghuang1, Shi Anbang1, Jiang Jiahui2, Wang Wu1, Lin Qiongbin1 |
1. School of Electrical Engineering and Automation Fuzhou University Fuzhou 350108 China;
2. School of Electrical Engineering Qingdao University Qingdao 266071 China |
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Abstract In order to simultaneously reduce the current stress and improve the dynamic characteristics of the dual-active-bridge (DAB) DC-DC converter, this paper establishes the operating characteristic model of transmitted power and current stress for six modes under triple phase shifting. Accordingly, a control scheme based on triple phase shifting combining current stress optimization and virtual voltage compensation is proposed. The scheme consists of the current stress optimal phase shift angle model and the virtual voltage compensation method. The KKT condition is used to obtain the current stress optimal phase shift angle model, and the virtual voltage compensation method is used to estimate the transmission power value to improve the dynamic characteristics when the load is suddenly changed and the input voltage is disturbed. The scheme can achieve fast dynamic response while ensuring current stress optimization, and the parameters are easily adjustable and portable. Finally, a small power prototype was built for the comparison experiment to verify the correctness and superiority of the proposed scheme.
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Received: 23 April 2021
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2022, Vol. 37 
