Transient Performances Analysis of Talkative Dual-Active Bridge Converter Modulated by PWM-FSK

Talkative power conversion (TPC), which can simultaneously transfer the energy and data by the power electronics converters and avoid using extra communication infrastructures, is an emerging technique for the digital power and digitalization of power system. In this paper, the TPC technology is used in the dual-active bridge (DAB) converter, in which the switching frequency and common phase are used as the degrees of control freedom respectively to modulate the data and power simultaneously. The transient performances of the DAB converters modulated by the PWM-frequency shift keying (PWM-FSK), which is a simple and effective technique for the TPC. The constraints on carrier frequency are derived, and the influence of data communication on power conversion is analyzed. The demodulation strategy based on the fast Fourier transform (FFT) algorithm is used to acquire the sent data. The simulation and experimental results clearly validate the effectiveness and correctness of the theoretical analysis.