Photovoltaic off-grid hydrogen production system operation mode switching instant DC bus voltage stability control method

By reconstructing the high-dimensional phase space trajectory and geometric characteristics of the off-grid photovoltaic hydrogen production system, and combining feedforward and feedback control, the problem of DC bus voltage fluctuation in the off-grid photovoltaic hydrogen production system was solved, achieving rapid and stable voltage control and improving the system's stability and response speed.

CN121011981APending Publication Date: 2025-11-25安徽华赛能源科技股份有限公司 +2
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Patent Information

Application Number
CN202511195921.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-26
Publication Date
2025-11-25

AI Technical Summary

Technical Problem

Existing technologies in photovoltaic off-grid hydrogen production systems struggle to effectively address the drastic fluctuations and instability of DC bus voltage during operation mode switching, especially when photovoltaic output and electrolyzer changes, leading to decreased control performance and system instability.

Method used

By acquiring the preprocessed DC bus voltage signal, reconstructing the high-dimensional phase space trajectory using adaptive delay time, calculating the phase space geometric characteristics, combining the historical trajectory database to predict future voltage, and generating feedforward and feedback control signals, stable voltage control is achieved.

Benefits of technology

It achieves accurate causal prediction of voltage trajectory, suppresses overshoot and oscillation, ensures the speed, smoothness and robustness of control, and improves the stability and response speed of the system.

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Abstract

The invention discloses a photovoltaic off-grid hydrogen production system operation mode switching instant DC bus voltage stability control method, which comprises the steps of collecting a DC bus voltage signal, and reconstructing a high-dimensional phase space trajectory; calculating real geometric features such as phase space curvature and torsion of the trajectory; searching a historical similar trajectory segment in a historical trajectory database, and generating a final prediction trajectory at a future moment according to a known evolution path of the historical similar trajectory segment; and generating a feedforward control signal according to the deviation between the final prediction track and the reference voltage, and combining the feedforward control signal with traditional feedback control to form a final control instruction. The method does not depend on an accurate system mathematical model, and realizes rapid, smooth and stable control of voltage under mode switching by deeply excavating dynamic geometric information of voltage signals.
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