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Due to the limitation of existing rectifier, it is difficult to realize the multiscale frequency regulation (FR) of rectifier interfaced large-size (multi MW scale) load. To overcome this issue, a novel coordinative control method of hybrid rectifier is proposed to realize multiscale FR, and it is specifically applied in electrolytic hydrogen production (EHP) load. The auxiliary converter in hybrid rectifier is utilized to realize short-time/low-power/small-energy scale FR, such as inertia support during transient state, smoothing the rate of change of frequency and buying time for the action of silicon controlled rectifier (SCR). SCR in hybrid rectifier takes the responsibility of FR of long-time/high-power/large-energy scale, such as primary or secondary FR. The operation characteristic of large-size EHP load is reconstructed so that it obtains the multiscale FR capability. The effectiveness of proposed method is verified by experimental results. [ABSTRACT FROM AUTHOR]