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Utility-scale renewable power-to-hydrogen (ReP2H) production typically usesthyristor rectifiers (TRs) to supply power to multiple electrolyzers (ELZs).They exhibit a nonlinear and non-decouplable relation between active andreactive power. The on-off scheduling and load allocation of multiple ELZssimultaneously impact energy conversion efficiency and AC-side active andreactive power flow. Improper scheduling may result in excessive reactive powerdemand, causing voltage violations and increased network losses, compromisingsafety and economy. To address these challenges, this paper first explorestrade-offs between the efficiency and the reactive load of the electrolyzers.Subsequently, we propose a coordinated approach for scheduling the active andreactive power in the ReP2H system. A mixed-integer second-order coneprogramming (MISOCP) is established to jointly optimize active and reactivepower by coordinating the ELZs, renewable energy sources, energy storage (ES),and var compensations. Case studies demonstrate that the proposed methodreduces losses by 3.06% in an off-grid ReP2H system while increasing hydrogenproduction by 5.27% in average.

Coordinated Active-Reactive Power Management of ReP2H Systems with Multiple Electrolyzers