Energy storage becomes a necessity when a high penetration of renewable energy sources is desirable. Variability in the energy production from these types of energy sources can make the utility grid unstable, if the percentage of production is important. In order to minimize this problem, the HiDRENER project was designed to study the effect of combining different renewable energy sources with energy storage on grid stability. The system has a wind generator, a gasifying biomass power plant with syngas storage, a solar photovoltaic plant, and a hydrogen energy buffer. Controlling the entire system is very complex. This paper shows the results of the grid-connected hydrogen energy buffer characterization, considering hydrogen production in this first stage. The objective is to know the complete behavior of the system, which could help us to define the energy buffer control. This control is oriented toward consuming excess energy produced by the other sources in real time. This means that the hydrogen buffer control has to negotiate how much energy can be stored, and act on the production system. Thus, actuation variables and dynamic behavior have to be discovered.
Dr. E.A. Veziroglu Editor-in-ChiefInternational Journal of Hydrogen Energy The article that I send to be considered for its inclusion in your publication presents the results of an experimental characterization study done to a grid connected hydrogen production system that is part of a complete project, named HiDRENER. The HiDRENER project was designed to study the effect of combining different renewable energy sources with energy storage on grid stability. The system has a wind generator, a gasifying biomass power plant with syngas storage, a solar photovoltaic plant, and a hydrogen energy buffer. The hydrogen production system takes part of the hydrogen energy buffer. The objective is to know the complete behavior of the system, which could help us to define the energy buffer control. This control is oriented toward consuming excess energy produced by the other sources in real time. Thus, before we designed the control system, we need to know the complete behavior of production system. This work is the natural continuation of last papers that we published in your publication, titled Wind park reliable energy production based on a hydrogen compensation system. Part I and II. There, we showed the results of the system simulation. Now, we show first results of experimental implementation.Thank you very much in advance for your time.
Sincerely yours Carlos Sánchez-DíazCover Letter Dear Dr. Muradov, We want to thank the reviewers their comments that, we are sure, will improve the quality of the paper, even if they consider that it is not able to publication. Below we show their comments and we describe the modifications made to the original document we sent. If no modification is made, we justify why.
Reviewer #1:This paper is generally well written, but another check is required: for example, figure 8, 9, 11, 13, 14, 15 present words in Spanish ...