ADRC Voltage Control Based on Asymmetric Duty Modulations Strategy for Dual Active Bridge

Abstract

In view of the dynamic characteristics and the transmission efficiency problems for dual active bridge (DAB) converters of storage energy in a wide voltage range, an asymmetric duty cycle modulation strategy for the DAB converters of storage energy based on active disturbance rejection control (ADRC) of voltage control is proposed, which significantly improves the transmission efficiency and the dynamic performance in DAB converters of storage energy. Firstly, a principle of asymmetric duty cycle modulation is described, and a linear large signal model is derived with the value of unified transmission power as the control quantity. The parameter setting process is optimized using an asymmetric duty cycle modulation principle, and a corresponding linear active disturbance rejection controller is designed to ensure system performance. Finally, the experiment is verified by simulation platform, simulation results show that the transmission efficiency reaches up to 94.87%, which improves the transmission efficiency of DAB converters of storage energy. At the same time, proposed control has better robustness than traditional PI control, greatly, the problem of too many parameters and difficult values in design of traditional ADRC controller is simplified.