Multi-scale Frequency Modulation Method for Electrolytic Hydrogen Production Rectifier Power Supply Based on Adaptive Parameter Adjustment

In new energy electrolytic hydrogen production systems, all equipment is connected to the AC bus via power electronic converters, exhibiting low inertia characteristics and poor frequency stability. This paper investigates multi-scale frequency regulation for electrolytic hydrogen production loads, proposing a novel hydrogen production rectifier power supply topology and adaptive frequency regulation strategy. The novel hydrogen production rectifier power supply adopts a hybrid rectifier topology, where phase-controlled rectifiers are used to achieve primary and even secondary frequency regulation, while auxiliary converters composed of voltage-source converters and dual active bridge converters are employed to provide inertia support. By adaptively adjusting the control parameters of the rectifier power supply, the frequency transient characteristics such as the minimum frequency point and maximum frequency change rate are improved, effectively enhancing the system's frequency stability. Finally, through simulation and experimental verification, the effectiveness of the proposed rectifier power supply topology and control method is validated.