Multi-Objective Sizing of Hybrid Energy Storage System for Large-Scale Photovoltaic Power Generation System
Round 1
Reviewer 1 Report
The paper needs improvements, to be easier, for the reader to follow.
Figures need a clear reference in the text. For the moment no figures has reference, in the file i could download.
Equations 4, 5, 6 need explanation - where are coming from- references are used? is it authors contributions?
line 158 - Ni .....phrase is not good placed, is difficult to follow
line 192 -the phrase missing the subject
section 3.2 - please explain how the decomposition is done?
section 3.3 - please explain how the statistics from figure 7 are obtained
section 3.5 - is not clear if the proposed method SC VRB is for real implemented in the study case; please make this matter more clear; maybe data results after implemetation are should be presented
section 3.5 - how the limits of the model for the cloudy days can be improved ?
table 4 - please explain what optimal interval represents
Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
This study concerns on issues connected with sizing the hybrid energy storage for large-scale PV installation. Authors proposed algorithm for sizing the capacity of energy storage including costs and target output satisfaction. The paper is very interesting and promising, the strength of it is proposed original multi-objective model, but there are some concerns:
Line 43 please define ESS Line 104, please define HPSs, HESs, VRB Throughout the text there are no references to figures!!! Is just text ‘’Error! Reference source not found”. Please try to correct it, because it’s hard to understand your work without appropriate references to figures. Line 127 please define Ph and Pl. In line you 152 you write that you used GA to solve the model. Which method of GA was used? How the GA was built? Please complete this information. Please define what is Pr on the Figure 3. You mentioned that you choose typical days with typical weather condition. How you choose the typical days? What were the criteria of choosing presented curves in figure 4. You show on the figure 5 the probability distribution of PV power and fluctuation. How you calculate this? It was calculate from data for one typical days you choose or for group of this days in the year? The time ration of typical weather conditions was calculated for year? How you choose the target output? It was calculated? In case study (section 3.) the simulation was conducted. What was the daily initial electric quantity of the energy stored in energy storage? In figures 9 and 10 you show the comparison curves. For which configuration of energy storage are they? What represents blue and red curve in figure 13? It will be good to add a legend to the graph.Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Reviewer 3 Report
Sustainability601768
This paper presents a sizing method for Hybrid energy storage system (HESS) equipped for large-scale centralized PV power station based on a two parts method: determining the power capacity by a statistical method considering the effects of multiple weather conditions and calculating the optimal Results show that the optimal capacity configuration can significantly improve the stability of PV output and the pre-storage strategy can further improve the target output satisfaction rate by 8.28%. The methodology has been proven on 850MW centralized PV power station. The energy capacity of HESS is designed considering system economy and output stability and using he PV output characteristics and the time ratios of four weather conditions (sunny, cloudy, rainy, snowy).
Some recommendations (R) to improve the paper are as follows:
R1. Mention relevant and recent studies that define and use the factors considered in this study (system economy or/and output stability) in evaluation of the HESS design.
R2. List of references must contain recent papers and studies published in the last three years (more than 70%) in order to comparatively define and evaluate the actual solutions of the HESS design.
R3. The relevance to Sustainability journal and its readers must be fully justified. Include some references from the Sustainability journal.
R4. “As depicted in Fig. 6, the target output is a smooth and stable curve while …”; mention the period for which is stable.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 2 Report
Dear Authors,
I would like to thank you for provided changes and explaining issues being my concern. Now article sounds pretty well. You have done huge work and I appreciate your effort. Now it's suitable for publication.
