Smooth Gradient Control of Signal Ripple at the Output Side of a Charging Pile Based on Small-signal Scattering Characteristics
DOI:
https://doi.org/10.52152/4287Keywords:
Small signal, Scattering characteristics, Charging pile, Output side signal, Transfer conductance, PID controllerAbstract
The signal ripple on the output side of a charging pile is prone to large fluctuations due to load changes, leading to unstable current, abnormal battery charging, and reduced battery lifespan. The small-signal scattering characteristics can reflect the charging pile's response to load fluctuations, and controlling these characteristics can help mitigate signal ripple fluctuations. To achieve this, a smooth gradient control method for the output-side signal ripple of the charging pile is proposed, based on small-signal scattering characteristics. First, the main circuit model of the Superbuck converter of the charging pile is constructed, and the small-signal model is generated by selecting the input and state variables from the model. The small-signal scattering characteristic of the converter is analyzed in the input small-signal perturbation by using the model, and the relationship between the characteristic and the signal ripple component of the output side is obtained. Based on the analysis, the amplitude gain of the transferring derivative is selected as the control parameter. Then, the PID controller parameters are optimized using the gradient descent method to minimize the output-side signal ripple. The results show that this method effectively controls the ripple component of the current signal on the output side of the charging pile under low-frequency perturbation at different output voltages. By adjusting the transfer derivative amplitude gain, the output-side signal ripple is significantly smoothed. The average reduction of the ripple component after the smoothing can be up to 0.275 A, ensuring stable output from the charging pile.
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Copyright (c) 2025 Zheng Chang, Chao Zhang, Peng Tao, Yangrui Zhang, Xiaoyu Liu, Shasha Zhao (Author)
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