Interleaved Parallel VDCM Improves Stability Control of Wind Power-hydrogen Coupled Integrated System

Aiming at the problems of poor transient characteristics of converter output DC voltage and large DC current ripple caused by alkaline electrolyzer (AEL) switching operation in the wind power-hydrogen coupled integrated system, this paper proposes an interleaved parallel VDCM control method to improve the stable operation of the system. Firstly, a refined mathematical-physical model of the wind power-hydrogen coupled integrated system, including HD-PMSG, interleaved parallel buck, and AEL, is constructed. Then, the VDCM control strategy is introduced into the interleaved parallel buck converter, which provides reliable inertia and damping support for the output voltage of the hydrogen production system by simulating the DC motor power regulation characteristics and effectively improving the current ripple of the output current. Meanwhile, the influence of rotational inertia and the damping coefficient on the dynamic stability of the system in the control strategy is analyzed based on the small signal method. Finally, the proposed method is validated through MATLAB/SIMULINK simulation experiments and RCP + HIL hardware-in-the-loop experiments. The results show that the proposed method can improve the dynamic stability of the wind power-hydrogen coupled integrated system effectively.