Dynamic Electric Energy Reference Signal Modeling of the Fast-changing Waveform Mode of DC Charging Piles

Aiming at the problems that the waveform modal description of the fast changing DC current and voltage of the DC charging pile is not perfect, the available sample data is insufficient, the waveform characteristics are not clear, and the mathematical model of the waveform mode is lacking. Firstly, the time-frequency domain characterization model of DC and voltage signal of charging pile is established. Then, 30 waveform modes are extracted, and three waveform modes and their corresponding characteristic parameters are proposed. Based on this, the waveform feature library of three kinds of waveform modes is established. Secondly, the mathematical model of three waveform modes is established using the time-frequency atom method, which solves the problem of reflecting the important waveform characteristics of the actual waveform modes. Finally, the reference test signal model of dynamic energy metering is established, and the characteristic information of the dynamic DC test signal is characterized.