Power Quality Control of Renewable Energy System for Hydrogen Production Based on Virtual Impedance

Hydrogen production system (HPS) has received increasing attention since it can not only consume the surplus energy on a large scale in renewable energy systems (RES), but also produce green hydrogen. Rectifier is an essential part in HPS, while typical rectifiers are based on thyristor since the DC current level of the industrial water electrolysis is very high, which increases the current harmonics and deteriorates the power quality of RES. To address this issue, a virtual impedance control strategy for grid-connected inverter of energy storage system (ESS) in RES is proposed. Simulation results verifies the effectiveness of the proposed control strategy.