• Home|About JOPS|Editorial Board| Ethics Statement|Indexed-in|Contact us|Peer Review|Chinese
Latest Papers more>>
LI Molin,GUO Zhiqiang.Output Impedance Analysis of Dual Active Bridge Converter with Load Current Feedforward Closed-loop Control for Fast Dynamic Response[J].JOURNAL OF POWER SUPPLY,2020,18(3):55-62
Output Impedance Analysis of Dual Active Bridge Converter with Load Current Feedforward Closed-loop Control for Fast Dynamic Response
Received:December 01, 2019  Revised:February 20, 2020
View Full Text  View/Add Comment  Download reader
DOI:10.13234/j.issn.2095-2805.2020.3.55
Keywords:dual active bridge(DAB)  feedforward  fast dynamic response
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
     
AuthorInstitutionEmail
LI Molin School of Automation, Beijing Institute of Technology, Beijing , China
GUO Zhiqiang School of Automation, Beijing Institute of Technology, Beijing , China
Hits: 217
Download times: 210
Abstract:
      In this paper, a control strategy of dual active bridge(DAB) converter based on feedforward control is pro-posed. By analyzing a small-signal model, the output impedance from the DAB converter is analyzed. The output impedance, which is associated not only with the output capacitor but also with the gain of the control loop, has an impact on the circuit’s dynamic performance. Due to the transport delay and zero-order holder(ZOH), the crossover frequency and gain of the control loop cannot be selected to be too high. If the output capacitance is very low, then the converter cannot achieve fast dynamic response. To improve the dynamic performance, a novel feedforward control strategy is proposed according to the desired output current. The feedforward path is only associated with load current, and it is independent of the output voltage. Furthermore, the feedforward control is easy to implement in the real-time calculation. The closed-loop gain under the control strategy with feedforward is compared with that under single voltage closed-loop control, demo-nstrating that the control loop with the proposed feedforward control has better dynamic performance. Finally, a 1 kW experimental prototype was built, and experimental results verified the effectiveness of the proposed control strategy.
Close