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| Predictive Current Control Method for Bidirectional DC-DC Converter Based on Optimal Operating Time of Vector |
| Yang Hui, Chao Kaiyue, Sun Xiangdong, Zhang Qi, Luo Shan |
| School of Electrical Engineering Xi’an University of Technology Xi’an 710048 China |
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Abstract In a DC microgrid system with distributed power, factors such as distributed power output fluctuations and load mutations will cause fluctuations in the DC bus voltage. In order to improve the output performance of the system and further improve the rapidity of the system, the predictive current control method for bidirectional DC-DC converter based on optimal operating time of vector is proposed in this paper. The predictive current controller is used to replace the traditional current loop PI controller and modulation part, which improves the rapidity of the system effectively. In order to solve the problem of large current ripple caused by the inconstant switching frequency in the traditional predictive current control method, an improved control method is proposed. A new objective function is designed to achieve constant frequency control based on the vector action time calculated online. The simulation and experimental results show that the battery current ripples and the DC bus voltage fluctuations are suppressed effectively by the predictive current control method of photovoltaic energy storage bidirectional DC-DC converter based on optimal operating time of vector, and the disturbance rejection capability of the system can be enhanced by the method proposed in this paper.
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Received: 01 July 2018
Published: 05 March 2020
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2020, Vol. 35 
