考虑安全约束的离网光伏制氢系统多模式协调控制OA

To address the source-load power mismatch in off-grid photovoltaic(PV)hydrogen production systems arising from PV power fluctuation and the slow dynamics of alkaline water electrolyzers,a multi-mode coordinated control strategy based on real-time power comparison and multi-loop coordination is proposed.Firstly,the mathematical models of the PV array,a three-phase interleaved Buck converter,and the alkaline water electrolyzer are established.Then,a mode decision mechanism is designed to continuously compare the estimated maximum PV power with the temperature-adaptive safe power limit of the electrolyzer,thereby integrating electrolyzer thermal dynamics into the control loop for adaptive safety boundary adjustment.Furthermore,a power-voltage cascade controller is constructed to achieve smooth transitions between the maximum power point tracking(MPPT)and power-limiting modes,with a power overshoot of 1.48%and a mode-switching dead time of 0.3 s.Meanwhile,a current protection loop and a low-selector are introduced,suppressing the current overshoot from 14.8%to 4.96%under degraded main-loop performance.Simulation results demonstrate that under various disturbances,including irradiance variations and electrolyzer temperature rise,the proposed strategy effectively maintains source-load power balance,and ensures equipment safety,and achieves stable mode switching.