质子交换膜电解槽内部短路故障特性分析及保护策略OA

Internal short-circuit faults in proton exchange membrane(PEM)electrolyzers develop rapidly and pose severe hazards.Rapid and reliable fault identification is crucial for enhancing hydrogen production system safety.Therefore,this paper investigates the characteristics and protection methods for internal short-circuit faults in PEM electrolyzers.Firstly,based on the fundamental principles of electrolytic hydrogen production and polarization characteristics,an equivalent circuit model for the PEM electrolyzer,which accounts for the electric double-layer capacitance effect,is established.Building upon this,combined with DC-DC converter control strategies,a precise calculation method for the transient and steady-state characteristics of electrolyzer internal short-circuit faults is proposed.Based on fault characteristics,protection criteria utilizing steady-state current variation and the sign feature of power variation are proposed,with their operating boundaries analyzed.Finally,extensive simulations demonstrate that the proposed fault analysis method achieves an average relative error below 5％for transient current and below 1％for steady-state current.The proposed protection strategy accurately identifies internal short-circuit faults in PEM electrolyzers.