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Current Sensorless Control for Dual Active Bridge DC–DC Converter with Estimated Load-Current Feedforward

2017; Institute of Electrical and Electronics Engineers; Volume: 33; Issue: 4 Linguagem: Inglês

10.1109/tpel.2017.2705344

1941-0107

Fei Xiong, Junyong Wu, Zicheng Liu, Liangliang Hao,

Multilevel Inverters and Converters

This paper proposes a current sensorless control strategy for the dual active bridge (DAB) converter with nonlinear disturbance observer (NDO)-based load current feedforward. The proposed method can regulate both the dc-bus voltage and the current of the DAB converter without current sensors. Several performance indexes are established for the parameter design and a detailed design method is presented in this paper. When a single-phase H-bridge inverter is connected, the double-frequency oscillation from the feedback path is suppressed by proper parameter design, while the transient response of dc-bus voltage can be further improved by the NDO-based load current feedforward with a notch filter in the feedforward path. The performance of the proposed control method and the effectiveness of the parameter design are verified in a prototype by experimental results.